FileOp.cs
using System;using System.IO;using System.Web;using System.Text;using System.Drawing;using System.Drawing.Imaging;using System.Collections;/**//// <summary>
/// Summary description for Fileop/// 搜集编写者losingrose/// QQ:303864496/// MSN:losingrose@21cn.com/// http://losingrose.cnblogs.com
/// </summary>public static class MyFileOp
{ //生成 (年,月,日,时,分,秒)+随机数的文件名 private static string names()
{ Random rm = new Random(System.Environment.TickCount); return System.DateTime.Now.ToString("yyyyMMddhhmmss") + rm.Next(1000, 9999).ToString();
} private static string CheckPath(string path) { int i = 0; while (File.Exists(path)) { i++; path = Path.GetDirectoryName(path) + Path.DirectorySeparatorChar + Path.GetFileNameWithoutExtension(path) + i + Path.GetExtension(path); } return path; } /**//// <summary> /// 得到1970年的时间戳 /// </summary> /// <returns></returns> public static long Timestamp() { DateTime timeStamp = new DateTime(1970, 1, 1); //得到1970年的时间戳 long a = (DateTime.UtcNow.Ticks - timeStamp.Ticks) / 10000000; //注意这里有时区问题，用now就要减掉8个小时 return a; } /**//// <summary> /// 判断文件格式是否为图片，返回真假 /// </summary> /// <param name="name">文件名</param> /// <returns>返回真假</returns> public static bool Is_Img(string name) { name = name.ToLower(); if (name.Contains(".gif") || name.Contains(".png") || name.Contains(".jpg") || name.Contains(".jpeg")) return true; else return false; } public static bool Is_AuthenticationFile(string name) { string ExtensionName = System.IO.Path.GetExtension(name); ExtensionName = ExtensionName.ToLower(); if (name.Contains(".gif") || name.Contains(".png") || name.Contains(".jpg") || name.Contains(".jpeg") || name.Contains(".bmp") || name.Contains(".rar") || name.Contains(".zip")) return true; else return false; } public static bool Size_Limit(HttpPostedFile file, int length, string unit) { if (unit.ToUpper() == "B") goto end; length = length * 1024;//KB if (unit.ToUpper() == "KB") goto end; length = length * 1024;//M if (unit.ToUpper() == "M") goto end; length = length * 1024;//G if (unit.ToUpper() == "G") goto end; length = length * 1024;//T end: if (file.ContentLength > length) return false; else return true; } /**//// <summary> /// 在某个地方建立制定名字的文件夹供用户用，返回虚拟路径 /// </summary> /// <param name="mappath">待建目录的路径</param> /// <param name="username">待建文件夹的名字</param> /// <returns>返回虚拟路径</returns> public static string User_Path(string mappath, string username) { string path = mappath + Path.DirectorySeparatorChar + username; if (!path.Contains(":")) path = HttpContext.Current.Server.MapPath(path); if (!Directory.Exists(path)) Directory.CreateDirectory(path); return path.Replace(HttpContext.Current.Server.MapPath("~/"), "~/").Replace("\\", "/"); } /**//// <summary> /// 创建目录，返回物理目录路径。 /// </summary> /// <param name="path">待创建目录路径</param> /// <returns>返回物理目录路径</returns> public static string Creat_Dir(string path) { if (!path.Contains(":")) path = HttpContext.Current.Server.MapPath(path); if (!Directory.Exists(path)) Directory.CreateDirectory(path); if (Directory.Exists(path)) return path; else return ""; } /**//// <summary> /// 删除路径 /// </summary> /// <param name="path"></param> /// <returns></returns> public static bool Del_Dir(string path) { if (!path.Contains(":")) path = HttpContext.Current.Server.MapPath(path); try { foreach (string file in Directory.GetDirectories(path)) Del_Dir(file); foreach (string file in Directory.GetFiles(path)) File.Delete(file); Directory.Delete(path); } catch { return false; } return true; } /**//// <summary> /// 创建文件并写入内容 /// </summary> /// <param name="path">虚拟路径</param> /// <param name="content"></param> /// <returns></returns> public static bool Creat_File(string path, string content) { if (!path.Contains(":")) path = HttpContext.Current.Server.MapPath(path); try { StreamWriter sw = new StreamWriter(path, false, Encoding.Default); sw.Write(content); sw.Close(); sw.Dispose(); } catch { return false; } return true; } /**//// <summary> /// 续写文件内容 /// </summary> /// <param name="filepath">虚拟路径包含文件名</param> /// <param name="content"></param> /// <returns></returns> public static bool Append_File(string filepath, string content) { if (!filepath.Contains(":")) filepath = HttpContext.Current.Server.MapPath(filepath); try { StreamWriter sw = new StreamWriter(filepath, true, Encoding.Default); sw.Write(content); sw.Close(); sw.Dispose(); } catch { return false; } return true; } /**//// <summary> /// 读取文件内容 /// </summary> /// <param name="filepath">虚拟路径包含文件名</param> /// <returns></returns> public static string Read_File(string filepath) { StreamReader sr; if (!filepath.Contains(":")) filepath = HttpContext.Current.Server.MapPath(filepath); try { sr = new StreamReader(filepath, Encoding.Default); return sr.ReadToEnd(); } catch { sr = null; return string.Empty; } } public static double Get_FileSize(string filepath) { System.IO.FileInfo file; if (!filepath.Contains(":")) filepath = HttpContext.Current.Server.MapPath(filepath); try { file = new System.IO.FileInfo(filepath); double filesize = (((int)((file.Length / 1024.0) * 100))) / 100.0; return filesize; } catch { file = null; return 0; } } /**//// <summary> /// 上传文件并自动命名，返回文件的虚拟地址 /// </summary> /// <param name="file">要上传的本地文件</param> /// <param name="mappath">服务器的虚拟路径,请使用相对路径</param> public static string Up_File(HttpPostedFile file, string visualpath, string mappath) { try { string name = names() + Path.GetExtension(file.FileName); StringBuilder path = new StringBuilder(HttpContext.Current.Server.MapPath(mappath)); if (!Directory.Exists(path.ToString())) Directory.CreateDirectory(path.ToString()); path.Append(Path.DirectorySeparatorChar); path.Append(name); path = new StringBuilder(CheckPath(path.ToString())); name = Path.GetFileName(path.ToString()); file.SaveAs(path.ToString()); return (HttpContext.Current.Server.MapPath(mappath).Replace(HttpContext.Current.Server.MapPath(visualpath), "") + Path.DirectorySeparatorChar + name).Replace("\\", "/"); } catch (IOException e) { throw e; } } /**//// <summary> /// 上传文件指定文件名含扩展名，返回文件的虚拟地址 /// </summary> /// <param name="file">要上传的本地文件</param> /// <param name="mappath">服务器的虚拟路径,请使用相对路径</param> /// <param name="filename">要保存的文件命名,包括扩展名</param> public static string Up_File(HttpPostedFile file, string visualpath, string mappath, string filename) { try { StringBuilder path = new StringBuilder(HttpContext.Current.Server.MapPath(mappath)); if (!Directory.Exists(path.ToString())) Directory.CreateDirectory(path.ToString()); path.Append(Path.DirectorySeparatorChar); path.Append(filename); path.Append(Path.GetExtension(file.FileName)); Del_File(path.ToString()); file.SaveAs(path.ToString()); return (HttpContext.Current.Server.MapPath(mappath).Replace(HttpContext.Current.Server.MapPath(visualpath), "") + Path.DirectorySeparatorChar + filename + Path.GetExtension(file.FileName)).Replace("\\", "/"); } catch (IOException e) { throw e; } } public static string Copy_File(string file, string filename, string visualpath, string mappath) { try { if (!file.Contains(":")) file = HttpContext.Current.Server.MapPath(file); StringBuilder path = new StringBuilder(HttpContext.Current.Server.MapPath(mappath)); if (!Directory.Exists(path.ToString())) Directory.CreateDirectory(path.ToString()); path.Append(Path.DirectorySeparatorChar); path.Append(filename); path.Append(Path.GetExtension(file)); Del_File(path.ToString()); File.Copy(file, path.ToString()); return (HttpContext.Current.Server.MapPath(mappath).Replace(HttpContext.Current.Server.MapPath(visualpath), "") + Path.DirectorySeparatorChar + filename + Path.GetExtension(file)).Replace("\\", "/"); } catch (IOException e) { throw e; } } public static string Up_ImageLimitSize(HttpPostedFile file, string visualpath, string mappath) { string tempimg = MyFileOp.Up_File(file, visualpath, mappath); //try //{ int newwidth = 1024; int newheight = 1024; //定义Image对象变量 tempimg = HttpContext.Current.Server.MapPath(visualpath) + tempimg; string name = Path.GetFileName(tempimg); Image image = Image.FromFile(tempimg); //下面根据原有的图片尺寸计算要生成的图片尺寸 int width = image.Width; int height = image.Height; //如果比例符合则返回文件退出处理。 if (width <= newwidth && height <= newheight) return (HttpContext.Current.Server.MapPath(mappath).Replace(HttpContext.Current.Server.MapPath(visualpath), "") + Path.DirectorySeparatorChar + name).Replace("\\", "/"); //如果是gif图片则返回文件退出处理。 if (tempimg.ToLower().Contains(".gif")) return (HttpContext.Current.Server.MapPath(mappath).Replace(HttpContext.Current.Server.MapPath(visualpath), "") + Path.DirectorySeparatorChar + name).Replace("\\", "/"); if (width > height) { newheight = newwidth * height / width; } else { newwidth = newheight * width / height; } //用指定的大小和格式初始化 Bitmap 类的新实例 Bitmap newimage = new Bitmap(newwidth, newheight, PixelFormat.Format32bppArgb); //从指定的 Image 对象创建新 Graphics 对象 Graphics graphics = Graphics.FromImage(newimage); //清除整个绘图面并以透明背景色填充 graphics.Clear(Color.Transparent); //在指定位置并且按指定大小绘制 原图片 对象 graphics.DrawImage(image, new Rectangle(0, 0, newwidth, newheight)); string newname = names() + Path.GetExtension(name); string newfile = HttpContext.Current.Server.MapPath(mappath); if (!Directory.Exists(newfile)) Directory.CreateDirectory(newfile); newfile += Path.DirectorySeparatorChar + newname; Del_File(newfile); ImageCodecInfo imgtype = GetCodecInfo("image/jpeg"); switch (Path.GetExtension(newfile).ToLower()) { case ".jpg": imgtype = GetCodecInfo("image/jpeg"); break; case ".jpeg": imgtype = GetCodecInfo("image/jpeg"); break; case ".gif": imgtype = GetCodecInfo("image/jpeg"); break; case ".png": imgtype = GetCodecInfo("image/png"); break; case ".bmp": imgtype = GetCodecInfo("image/bmp"); break; case ".ico": imgtype = GetCodecInfo("image/ico"); break; default: break; } newfile = CheckPath(newfile); System.Drawing.Imaging.EncoderParameters parameters = new System.Drawing.Imaging.EncoderParameters(1); parameters.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, ((long)90)); newimage.Save(newfile, imgtype, parameters); image.Dispose(); newimage.Dispose(); graphics.Dispose(); newimage.Dispose(); Del_File(tempimg); return (HttpContext.Current.Server.MapPath(mappath).Replace(HttpContext.Current.Server.MapPath(visualpath), "") + Path.DirectorySeparatorChar + newname).Replace("\\", "/"); //} //catch (Exception e) //{ // throw e; //} } /**//// <summary> /// 获取图像编码解码器的所有相关信息 /// </summary> /// <param name="mimeType">包含编码解码器的多用途网际邮件扩充协议 (MIME) 类型的字符串</param> /// <returns>返回图像编码解码器的所有相关信息</returns> private static ImageCodecInfo GetCodecInfo(string mimeType) { ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders(); foreach (ImageCodecInfo ici in CodecInfo) { if (ici.MimeType == mimeType) return ici; } return null; } /**//// <summary> /// 上传加水印图片，返回图片的虚拟地址 /// </summary> /// <param name="file">要上传的本地图片</param> /// <param name="visualpath">设置的服务器文件上传虚拟路径用于替换掉无用的物理路径头</param> /// <param name="mappath">要上传到的服务器虚拟路径,请使用相对路径</param> /// <param name="filename">要保存的文件命名,包括扩展名，为空将自动命名</param> /// <param name="text">水印文字，为空则不打</param> /// <param name="waterimg">水印图片，为空则不打</param> public static string Up_Image(HttpPostedFile file, string visualpath, string mappath, string filename, string text, string waterimg) { try { string name = names() + Path.GetExtension(file.FileName); if (filename != "") name = filename + Path.GetExtension(file.FileName); StringBuilder path = new StringBuilder(HttpContext.Current.Server.MapPath(mappath)); if (!Directory.Exists(path.ToString())) Directory.CreateDirectory(path.ToString()); path.Append(Path.DirectorySeparatorChar); path.Append(name); string filetemp = path.ToString() + "temp"; Del_File(filetemp); file.SaveAs(filetemp); //定义Image对象变量 Image image = Image.FromFile(filetemp); Image newimage = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppRgb); Graphics g = Graphics.FromImage(newimage); g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //清空画布并以透明背景色填充 g.Clear(System.Drawing.Color.Transparent); g.DrawImage(image, 0, 0, image.Width, image.Height); //写版权文字 if (text != "") { //选择字体和大小 int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 }; Font crFont = null; SizeF crSize = new SizeF(); for (int i = 0; i < 7; i++) { crFont = new Font("arial", sizes[i], FontStyle.Bold); crSize = g.MeasureString(text, crFont); if ((ushort)crSize.Width < (ushort)image.Width) break; } //匹配适合高度底部上5% int yPixlesFromBottom = (int)(image.Height * .05); float yPosFromBottom = ((image.Height - yPixlesFromBottom) - (crSize.Height / 2)); float xCenterOfImg = (image.Width / 2); //定位中间 StringFormat StrFormat = new StringFormat(); StrFormat.Alignment = StringAlignment.Center; //使用60%黑色的一个Color(alpha值153)创建一个SolidBrush SolidBrush semiTransBrush1 = new SolidBrush(Color.FromArgb(153, 0, 0, 0)); g.DrawString(text, crFont, semiTransBrush1, new PointF(xCenterOfImg + 1, yPosFromBottom + 1), StrFormat); //在偏离右边1像素，底部1像素的合适位置绘制版权字符串。这段偏离将用来创建阴影效果 SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255)); g.DrawString(text, crFont, semiTransBrush, new PointF(xCenterOfImg, yPosFromBottom), StrFormat); } //打水印图片 if (waterimg != "") { Bitmap bmWatermark = new Bitmap(newimage); bmWatermark.SetResolution(newimage.HorizontalResolution, newimage.VerticalResolution); Graphics gw = Graphics.FromImage(bmWatermark); gw.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gw.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //加载图片 string x = HttpContext.Current.Server.MapPath(waterimg); Image watermark = Image.FromFile(x); //处理白色为透明色 ImageAttributes imageAttributes = new ImageAttributes(); ColorMap colorMap = new ColorMap(); colorMap.OldColor = Color.FromArgb(0, 0, 0, 255); colorMap.NewColor = Color.FromArgb(0, 0, 0, 0); ColorMap[] remapTable = { colorMap }; imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap); //第二个颜色处理用来改变水印的不透明性。通过应用包含提供了坐标的RGBA空间的5x5矩阵来做这个。通过设定第三行、第三列为0.7f我们就达到了一个不透明的水平。结果是水印会轻微地显示在图象底下一些。 float[][] colorMatrixElements = { new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.7f, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} }; ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements); imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); //绘制水印 int xPosOfWm = ((image.Width - watermark.Width) - 10); int yPosOfWm = ((image.Height - watermark.Height) - 8); gw.DrawImage(watermark, new Rectangle(xPosOfWm, yPosOfWm, watermark.Width, watermark.Height), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes); //返回图片 newimage = bmWatermark; gw.Dispose(); watermark.Dispose(); } g.Dispose(); ImageFormat imgtype = ImageFormat.Jpeg; switch (Path.GetExtension(path.ToString()).ToLower()) { case ".jpg": imgtype = ImageFormat.Jpeg; break; case ".jpeg": imgtype = ImageFormat.Jpeg; break; case ".gif": imgtype = ImageFormat.Jpeg; break; case ".png": imgtype = ImageFormat.Png; break; case ".bmp": imgtype = ImageFormat.Jpeg; break; case ".ico": imgtype = ImageFormat.Icon; break; default: break; } //string imgtype = "image/jpeg"; //switch (Path.GetExtension(file.FileName).ToLower()) //{ // case ".jpg": imgtype = "image/jpeg"; break; // case ".jpeg": imgtype = "image/jpeg"; break; // case ".gif": imgtype = "image/jpeg"; break; // case ".png": imgtype = "image/png"; break; // case ".bmp": imgtype = "image/bmp"; break; // default: break; //} //ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders(); //ImageCodecInfo ici = null; //foreach (ImageCodecInfo codec in codecs) //{ // if (codec.MimeType == imgtype) // ici = codec; //} //EncoderParameters ep = new EncoderParameters(); //ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)0); if (filename == "") path = new StringBuilder(CheckPath(path.ToString())); name = Path.GetFileName(path.ToString()); newimage.Save(path.ToString(), imgtype); image.Dispose(); newimage.Dispose(); if (File.Exists(filetemp)) File.Delete(filetemp); return (HttpContext.Current.Server.MapPath(mappath).Replace(HttpContext.Current.Server.MapPath(visualpath), "") + Path.DirectorySeparatorChar + name).Replace("\\", "/"); } catch (IOException e) { throw e; } } /**//// <summary> /// 上传加水印图片，控制水印位置，返回图片的虚拟地址 /// </summary> /// <param name="file">要上传的本地图片</param> /// <param name="visualpath">设置的服务器文件上传虚拟路径用于替换掉无用的物理路径头</param> /// <param name="mappath">要上传到的服务器虚拟路径,请使用相对路径</param> /// <param name="filename">要保存的文件命名,包括扩展名，为空将自动命名</param> /// <param name="text">水印文字，为空则不打</param> /// <param name="waterimg">水印图片，为空则不打</param> public static string Up_Image(HttpPostedFile file, string visualpath, string mappath, string filename, string text, string waterimg,int sx,int sy) { try { string name = names() + Path.GetExtension(file.FileName); if (filename != "") name = filename + Path.GetExtension(file.FileName); StringBuilder path = new StringBuilder(HttpContext.Current.Server.MapPath(mappath)); if (!Directory.Exists(path.ToString())) Directory.CreateDirectory(path.ToString()); path.Append(Path.DirectorySeparatorChar); path.Append(name); string filetemp = path.ToString() + "temp"; Del_File(filetemp); file.SaveAs(filetemp); //定义Image对象变量 Image image = Image.FromFile(filetemp); Image newimage = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppRgb); Graphics g = Graphics.FromImage(newimage); g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //清空画布并以透明背景色填充 g.Clear(System.Drawing.Color.Transparent); g.DrawImage(image, 0, 0, image.Width, image.Height); //写版权文字 if (text != "") { //选择字体和大小 int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 }; Font crFont = null; SizeF crSize = new SizeF(); for (int i = 0; i < 7; i++) { crFont = new Font("arial", sizes[i], FontStyle.Bold); crSize = g.MeasureString(text, crFont); if ((ushort)crSize.Width < (ushort)image.Width) break; } //匹配适合高度底部上5% int yPixlesFromBottom = (int)(image.Height * .05); float yPosFromBottom = ((image.Height - yPixlesFromBottom) - (crSize.Height / 2)); float xCenterOfImg = (image.Width / 2); //定位中间 StringFormat StrFormat = new StringFormat(); StrFormat.Alignment = StringAlignment.Center; //使用60%黑色的一个Color(alpha值153)创建一个SolidBrush SolidBrush semiTransBrush1 = new SolidBrush(Color.FromArgb(153, 0, 0, 0)); g.DrawString(text, crFont, semiTransBrush1, new PointF(xCenterOfImg + 1, yPosFromBottom + 1), StrFormat); //在偏离右边1像素，底部1像素的合适位置绘制版权字符串。这段偏离将用来创建阴影效果 SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255)); g.DrawString(text, crFont, semiTransBrush, new PointF(xCenterOfImg, yPosFromBottom), StrFormat); } //打水印图片 if (waterimg != "") { Bitmap bmWatermark = new Bitmap(newimage); bmWatermark.SetResolution(newimage.HorizontalResolution, newimage.VerticalResolution); Graphics gw = Graphics.FromImage(bmWatermark); gw.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gw.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //加载图片 string x = HttpContext.Current.Server.MapPath(waterimg); Image watermark = Image.FromFile(x); //处理白色为透明色 ImageAttributes imageAttributes = new ImageAttributes(); ColorMap colorMap = new ColorMap(); colorMap.OldColor = Color.FromArgb(0, 0, 0, 255); colorMap.NewColor = Color.FromArgb(0, 0, 0, 0); ColorMap[] remapTable = { colorMap }; imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap); //第二个颜色处理用来改变水印的不透明性。通过应用包含提供了坐标的RGBA空间的5x5矩阵来做这个。通过设定第三行、第三列为0.7f我们就达到了一个不透明的水平。结果是水印会轻微地显示在图象底下一些。 float[][] colorMatrixElements = { new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 1.0f, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f} }; ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements); imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); //绘制水印 int xPosOfWm = sx;// ((image.Width - watermark.Width) - 10); int yPosOfWm = sy;// ((image.Height - watermark.Height) - 8); gw.DrawImage(watermark, new Rectangle(xPosOfWm, yPosOfWm, watermark.Width, watermark.Height), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes); //返回图片 newimage = bmWatermark; gw.Dispose(); watermark.Dispose(); } g.Dispose(); ImageFormat imgtype = ImageFormat.Jpeg; switch (Path.GetExtension(path.ToString()).ToLower()) { case ".jpg": imgtype = ImageFormat.Jpeg; break; case ".jpeg": imgtype = ImageFormat.Jpeg; break; case ".gif": imgtype = ImageFormat.Jpeg; break; case ".png": imgtype = ImageFormat.Png; break; case ".bmp": imgtype = ImageFormat.Jpeg; break; case ".ico": imgtype = ImageFormat.Icon; break; default: break; } //string imgtype = "image/jpeg"; //switch (Path.GetExtension(file.FileName).ToLower()) //{ // case ".jpg": imgtype = "image/jpeg"; break; // case ".jpeg": imgtype = "image/jpeg"; break; // case ".gif": imgtype = "image/jpeg"; break; // case ".png": imgtype = "image/png"; break; // case ".bmp": imgtype = "image/bmp"; break; // default: break; //} //ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders(); //ImageCodecInfo ici = null; //foreach (ImageCodecInfo codec in codecs) //{ // if (codec.MimeType == imgtype) // ici = codec; //} //EncoderParameters ep = new EncoderParameters(); //ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)0); if (filename == "") path = new StringBuilder(CheckPath(path.ToString())); name = Path.GetFileName(path.ToString()); newimage.Save(path.ToString(), imgtype); image.Dispose(); newimage.Dispose(); if (File.Exists(filetemp)) File.Delete(filetemp); return (HttpContext.Current.Server.MapPath(mappath).Replace(HttpContext.Current.Server.MapPath(visualpath), "") + Path.DirectorySeparatorChar + name).Replace("\\", "/"); } catch (IOException e) { throw e; } } private static bool ThumbnailCallback() { return false; } /**//// <summary> /// 生成缩略图，返回图片的相对于visualpath的相对路径 /// </summary> /// <param name="file">生成缩略图片</param> /// <param name="visualpath">设置的服务器文件上传虚拟路径用于替换掉无用的物理路径头</param> /// <param name="mappath">要上传到的服务器虚拟路径,请使用相对路径</param> /// <param name="newwidth">缩略图宽度</param> /// <param name="newheight">缩略图高度</param> public static string Minimage(string file, string filename, string visualpath, string mappath, int newwidth, int newheight) { try { //定义Image对象变量 Image image = Image.FromFile(HttpContext.Current.Server.MapPath(file)); //下面根据原有的图片尺寸计算要生成的图片尺寸 int width = image.Width; int height = image.Height; if (width > height) { newheight = newwidth * height / width; } else { newwidth = newheight * width / height; } //用指定的大小和格式初始化 Bitmap 类的新实例 Bitmap newimage = new Bitmap(newwidth, newheight, PixelFormat.Format32bppArgb); //从指定的 Image 对象创建新 Graphics 对象 Graphics graphics = Graphics.FromImage(newimage); //清除整个绘图面并以透明背景色填充 graphics.Clear(Color.Transparent); //在指定位置并且按指定大小绘制 原图片 对象 graphics.DrawImage(image, new Rectangle(0, 0, newwidth, newheight)); System.Drawing.Imaging.EncoderParameters parameters = new System.Drawing.Imaging.EncoderParameters(1); parameters.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, ((long)90)); string name = "mini" + Path.GetFileName(file); if (filename != "") name = filename + Path.GetExtension(file); string newfile = HttpContext.Current.Server.MapPath(mappath); if (!Directory.Exists(newfile)) Directory.CreateDirectory(newfile); newfile += Path.DirectorySeparatorChar + name; File.Delete(newfile); ImageCodecInfo imgtype = GetCodecInfo("image/jpeg"); switch (Path.GetExtension(newfile).ToLower()) { case ".jpg": imgtype = GetCodecInfo("image/jpeg"); break; case ".jpeg": imgtype = GetCodecInfo("image/jpeg"); break; case ".gif": imgtype = GetCodecInfo("image/jpeg"); break; case ".png": imgtype = GetCodecInfo("image/png"); break; case ".bmp": imgtype = GetCodecInfo("image/bmp"); break; case ".ico": imgtype = GetCodecInfo("image/ico"); break; default: break; } if (filename == "") newfile = CheckPath(newfile); name = Path.GetFileName(newfile); newimage.Save(newfile, imgtype, parameters); image.Dispose(); newimage.Dispose(); return (HttpContext.Current.Server.MapPath(mappath).Replace(HttpContext.Current.Server.MapPath(visualpath), "") + Path.DirectorySeparatorChar + name).Replace("\\", "/"); } catch (Exception e) { throw e; } } /**//// <summary> /// 生成缩略图，返回图片的虚拟地址 /// </summary> /// <param name="file">生成缩略图片</param> /// <param name="visualpath">设置的服务器文件上传虚拟路径用于替换掉无用的物理路径头</param> /// <param name="mappath">要上传到的服务器虚拟路径,请使用相对路径</param> /// <param name="newwidth">缩略图宽度</param> /// <param name="newheight">缩略图高度</param> public static string MinimageFixSize(string file, string filename, string visualpath, string mappath, int newwidth, int newheight) { //try //{ //定义Image对象变量 Image image = Image.FromFile(HttpContext.Current.Server.MapPath(file)); //下面根据原有的图片尺寸计算要生成的图片尺寸 int width = image.Width; int height = image.Height; int nwidth = newwidth; int nheight = newheight; if (width > height) { nheight = nwidth * height / width; } else { nwidth = nheight * width / height; } //用指定的大小和格式初始化 Bitmap 类的新实例 Bitmap newimage = new Bitmap(nwidth, nheight, PixelFormat.Format32bppArgb); //从指定的 Image 对象创建新 Graphics 对象 Graphics graphics = Graphics.FromImage(newimage); //清除整个绘图面并以透明背景色填充 graphics.Clear(Color.Transparent); //在指定位置并且按指定大小绘制 原图片 对象 graphics.DrawImage(image, new Rectangle(0, 0, nwidth, nheight)); Bitmap bmWatermark = new Bitmap(newwidth, newheight); bmWatermark.SetResolution(bmWatermark.HorizontalResolution, bmWatermark.VerticalResolution); Graphics gw = Graphics.FromImage(bmWatermark); gw.Clear(Color.White); int xPosOfWm = ((bmWatermark.Width - newimage.Width) / 2); int yPosOfWm = ((bmWatermark.Height - newimage.Height) / 2); gw.DrawImage(newimage, new Rectangle(xPosOfWm, yPosOfWm, newimage.Width, newimage.Height), 0, 0, newimage.Width, newimage.Height, GraphicsUnit.Pixel); string name = Path.GetFileName(file); if (filename != "") name = filename + Path.GetExtension(file); string newfile = HttpContext.Current.Server.MapPath(mappath); if (!Directory.Exists(newfile)) Directory.CreateDirectory(newfile); newfile += Path.DirectorySeparatorChar + name; File.Delete(newfile); ImageCodecInfo imgtype = GetCodecInfo("image/jpeg"); switch (Path.GetExtension(newfile).ToLower()) { case ".jpg": imgtype = GetCodecInfo("image/jpeg"); break; case ".jpeg": imgtype = GetCodecInfo("image/jpeg"); break; case ".gif": imgtype = GetCodecInfo("image/jpeg"); break; case ".png": imgtype = GetCodecInfo("image/png"); break; case ".bmp": imgtype = GetCodecInfo("image/bmp"); break; case ".ico": imgtype = GetCodecInfo("image/ico"); break; default: break; } System.Drawing.Imaging.EncoderParameters parameters = new System.Drawing.Imaging.EncoderParameters(1); parameters.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, ((long)90)); if (filename == "") newfile = CheckPath(newfile); name = Path.GetFileName(newfile); bmWatermark.Save(newfile, imgtype, parameters); image.Dispose(); newimage.Dispose(); gw.Dispose(); bmWatermark.Dispose(); return (HttpContext.Current.Server.MapPath(mappath).Replace(HttpContext.Current.Server.MapPath(visualpath), "") + Path.DirectorySeparatorChar + name).Replace("\\", "/"); //} //catch (Exception e) //{ // throw e; //} } /**//// <summary> /// 生成缩略图,裁减尺寸，如果设置宽高为-1，默认用正方形最大取，如果设置偏移为-1，默认从中间位置取，返回图片的虚拟地址 /// </summary> /// <param name="file">生成缩略图片</param> /// <param name="visualpath">设置的服务器文件上传虚拟路径用于替换掉无用的物理路径头</param> /// <param name="mappath">要上传到的服务器虚拟路径,请使用相对路径</param> /// <param name="newwidth">截取范围宽度</param> /// <param name="newheight">截取范围高度</param> /// <param name="posLeft">左侧偏移量</param> /// <param name="posTop">顶部偏移量</param> public static string ImageCutMaxSize(string file, string filename, string visualpath, string mappath, int newwidth, int newheight, int posLeft, int posTop) { //try //{ //定义Image对象变量 Image image = Image.FromFile(HttpContext.Current.Server.MapPath(file)); int width = image.Width; int height = image.Height; int nwidth = width; int nheight = height; if (newwidth < nwidth || newheight < nheight) { int ratio = (int)(((float)newheight / (float)newwidth) * 1000); if (nheight > height) nheight = height; if (nwidth == -1) nwidth = width; if (nheight == -1) nheight = height; if (((float)height / (float)width) * 1000 > ratio) nheight = nwidth * ratio / 1000; else nwidth = nheight / ratio / 1000; //下面根据原有的图片尺寸计算要生成的图片尺寸 if (width < height) { if (newheight == -1) nheight = width; if (posLeft == -1) posLeft = 0; } else { if (newwidth == -1) nwidth = height; if (posTop == -1) posTop = 0; } } //如果为设置偏移重新计算偏移到中间 if (posLeft == -1) posLeft = (image.Width - nwidth) / 2; if (posTop == -1) posTop = (image.Height - nheight) / 2; //绘制背景 Bitmap bmWatermark = new Bitmap(nwidth, nheight); bmWatermark.SetResolution(bmWatermark.HorizontalResolution, bmWatermark.VerticalResolution); Graphics gw = Graphics.FromImage(bmWatermark); gw.Clear(Color.White); gw.DrawImage(image, new Rectangle(0, 0, nwidth, nheight), posLeft, posTop, nwidth, nheight, GraphicsUnit.Pixel); if (filename == "") filename = Path.GetFileNameWithoutExtension(file); filename += Path.GetExtension(file); string newfile = HttpContext.Current.Server.MapPath(mappath); if (!Directory.Exists(newfile)) Directory.CreateDirectory(newfile); newfile += Path.DirectorySeparatorChar + filename; File.Delete(newfile); ImageCodecInfo imgtype = GetCodecInfo("image/jpeg"); switch (Path.GetExtension(newfile).ToLower()) { case ".jpg": imgtype = GetCodecInfo("image/jpeg"); break; case ".jpeg": imgtype = GetCodecInfo("image/jpeg"); break; case ".gif": imgtype = GetCodecInfo("image/jpeg"); break; case ".png": imgtype = GetCodecInfo("image/png"); break; case ".bmp": imgtype = GetCodecInfo("image/bmp"); break; case ".ico": imgtype = GetCodecInfo("image/ico"); break; default: break; } System.Drawing.Imaging.EncoderParameters parameters = new System.Drawing.Imaging.EncoderParameters(1); parameters.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, ((long)90)); if (filename == "") newfile = CheckPath(newfile); filename = Path.GetFileName(newfile); bmWatermark.Save(newfile, imgtype, parameters); image.Dispose(); gw.Dispose(); bmWatermark.Dispose(); return (HttpContext.Current.Server.MapPath(mappath).Replace(HttpContext.Current.Server.MapPath(visualpath), "") + Path.DirectorySeparatorChar + filename).Replace("\\", "/"); //} //catch (Exception err) //{ // throw err; //} } /**//// <summary> /// 生成缩略图,裁减尺寸，如果设置宽高为-1，默认用正方形最大取，如果设置偏移为-1，默认从中间位置取，返回图片的虚拟地址 /// </summary> /// <param name="file">生成缩略图片</param> /// <param name="visualpath">设置的服务器文件上传虚拟路径用于替换掉无用的物理路径头</param> /// <param name="mappath">要上传到的服务器虚拟路径,请使用相对路径</param> /// <param name="newwidth">截取范围宽度</param> /// <param name="newheight">截取范围高度</param> /// <param name="posLeft">左侧偏移量</param> /// <param name="posTop">顶部偏移量</param> public static string ImageCutSize(string file, string filename, string visualpath, string mappath, int newwidth, int newheight, int posLeft, int posTop) { //try //{ //定义Image对象变量 Image image = Image.FromFile(HttpContext.Current.Server.MapPath(file)); int width = image.Width; int height = image.Height; int nwidth = newwidth; int nheight = newheight; if (nwidth == -1) nwidth = width; if (nheight == -1) nheight = height; //下面根据原有的图片尺寸计算要生成的图片尺寸 if (width < height) { if (newheight == -1) nheight = width; if (posLeft == -1) posLeft = 0; } else { if (newwidth == -1) nwidth = height; if (posTop == -1) posTop = 0; } //如果为设置偏移重新计算偏移到中间 if (posLeft == -1) posLeft = (image.Width - nwidth) / 2; if (posTop == -1) posTop = (image.Height - nheight) / 2; //绘制背景 Bitmap bmWatermark = new Bitmap(nwidth, nheight); bmWatermark.SetResolution(bmWatermark.HorizontalResolution, bmWatermark.VerticalResolution); Graphics gw = Graphics.FromImage(bmWatermark); gw.Clear(Color.White); gw.DrawImage(image, new Rectangle(0, 0, nwidth, nheight), posLeft, posTop, nwidth, nheight, GraphicsUnit.Pixel); if (filename == "") filename = Path.GetFileNameWithoutExtension(file); filename += Path.GetExtension(file); string newfile = HttpContext.Current.Server.MapPath(mappath); if (!Directory.Exists(newfile)) Directory.CreateDirectory(newfile); newfile += Path.DirectorySeparatorChar + filename; File.Delete(newfile); ImageCodecInfo imgtype = GetCodecInfo("image/jpeg"); switch (Path.GetExtension(newfile).ToLower()) { case ".jpg": imgtype = GetCodecInfo("image/jpeg"); break; case ".jpeg": imgtype = GetCodecInfo("image/jpeg"); break; case ".gif": imgtype = GetCodecInfo("image/jpeg"); break; case ".png": imgtype = GetCodecInfo("image/png"); break; case ".bmp": imgtype = GetCodecInfo("image/bmp"); break; case ".ico": imgtype = GetCodecInfo("image/ico"); break; default: break; } System.Drawing.Imaging.EncoderParameters parameters = new System.Drawing.Imaging.EncoderParameters(1); parameters.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, ((long)90)); if (filename == "") newfile = CheckPath(newfile); filename = Path.GetFileName(newfile); bmWatermark.Save(newfile, imgtype, parameters); image.Dispose(); gw.Dispose(); bmWatermark.Dispose(); return (HttpContext.Current.Server.MapPath(mappath).Replace(HttpContext.Current.Server.MapPath(visualpath), "") + Path.DirectorySeparatorChar + filename).Replace("\\", "/"); //} //catch (Exception err) //{ // throw err; //} } /**//// <summary> /// 生成缩略图,裁减尺寸，如果设置偏移为-1，默认从中间位置取，返回图片的虚拟地址 /// </summary> /// <param name="file">生成缩略图片</param> /// <param name="visualpath">设置的服务器文件上传虚拟路径用于替换掉无用的物理路径头</param> /// <param name="mappath">要上传到的服务器虚拟路径,请使用相对路径</param> /// <param name="newwidth">缩略图宽度</param> /// <param name="newheight">缩略图高度</param> /// <param name="posLeft">左侧偏移量</param> /// <param name="posTop">顶部偏移量</param> public static string MinimageCutSize(string file, string filename, string visualpath, string mappath, int newwidth, int newheight, int posLeft, int posTop) { //try //{ //定义Image对象变量 Image image = Image.FromFile(HttpContext.Current.Server.MapPath(file)); //绘制背景 Bitmap bmWatermark = new Bitmap(newwidth, newheight); bmWatermark.SetResolution(bmWatermark.HorizontalResolution, bmWatermark.VerticalResolution); Graphics gw = Graphics.FromImage(bmWatermark); gw.Clear(Color.White); //如果为设置偏移重新计算偏移到中间 if (posLeft == -1) posLeft = (image.Width - newwidth) / 2; if (posTop == -1) posTop = (image.Height - newheight) / 2; gw.DrawImage(image, new Rectangle(0, 0, newwidth, newwidth), posLeft, posTop, newwidth, newwidth, GraphicsUnit.Pixel); if (filename == "") filename = Path.GetFileNameWithoutExtension(file); filename += Path.GetExtension(file); string newfile = HttpContext.Current.Server.MapPath(mappath); if (!Directory.Exists(newfile)) Directory.CreateDirectory(newfile); newfile += Path.DirectorySeparatorChar + filename; File.Delete(newfile); ImageCodecInfo imgtype = GetCodecInfo("image/jpeg"); switch (Path.GetExtension(newfile).ToLower()) { case ".jpg": imgtype = GetCodecInfo("image/jpeg"); break; case ".jpeg": imgtype = GetCodecInfo("image/jpeg"); break; case ".gif": imgtype = GetCodecInfo("image/jpeg"); break; case ".png": imgtype = GetCodecInfo("image/png"); break; case ".bmp": imgtype = GetCodecInfo("image/bmp"); break; case ".ico": imgtype = GetCodecInfo("image/ico"); break; default: break; } System.Drawing.Imaging.EncoderParameters parameters = new System.Drawing.Imaging.EncoderParameters(1); parameters.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, ((long)90)); if (filename == "") newfile = CheckPath(newfile); filename = Path.GetFileName(newfile); bmWatermark.Save(newfile, imgtype, parameters); image.Dispose(); gw.Dispose(); bmWatermark.Dispose(); return (HttpContext.Current.Server.MapPath(mappath).Replace(HttpContext.Current.Server.MapPath(visualpath), "") + Path.DirectorySeparatorChar + filename).Replace("\\", "/"); //} //catch (Exception err) //{ // throw err; //} } public static bool Del_File(string mappath) { if (!mappath.Contains(":")) mappath = HttpContext.Current.Server.MapPath(mappath); try { File.Delete(mappath); } catch { return false; } return true; } public static bool Exists_File(string mappath) { if (!mappath.Contains(":")) mappath = HttpContext.Current.Server.MapPath(mappath); return File.Exists(mappath); } public static string[] List_File(string mappath) { if (!mappath.Contains(":")) mappath = HttpContext.Current.Server.MapPath(mappath); return Directory.GetFiles(mappath); }}TrackBack：http://www.cnblogs.com/losingrose/articles/1499462.html
