我搜集这段代码是为了编写一段能做高质量透明水印的功能,我把我写的代码贴在下面:
由于是自己写的类库,有些参数没有提供,如有什么问题,大家可以一起探讨
/// <summary>
/// 上传图片函数
/// </summary>
/// <param name="PicTitle">图片标题</param>
/// <param name="pictype">图片类型</param>
/// <param name="fileid">图片的GUID</param>
/// <param name="fileupload">上传控件</param>
/// <returns>返回上传结果</returns>
public static bool UploadPic(string PicTitle,PicType pictype,string fileid,System.Web.UI.WebControls.FileUpload fileupload)
{
try
{
string filename = fileupload.PostedFile.FileName;
string ExtName = filename.Substring(filename.LastIndexOf(".")).ToLower().Replace(".", "");
string strdir = ClassUploadFile.ReturnDir(PicTitle, pictype);
//记录日志
System.IO.StreamWriter writer = new StreamWriter("E:\\IMAGES\\LOG.txt", true, System.Text.Encoding.Default, 1024 * 16);
writer.WriteLine(strdir + filename);
//解压缩并写到日志
// writer.WriteLine(CB.Components.ClassCompress.UnZipFile(strdir + filename, strdir));
writer.Flush();
writer.Close();
fileupload.SaveAs(strdir + fileid + "." + ExtName);
if (ClassUploadFile.Add(fileid, ExtName, PicTitle + "的LOGO文件", ClassUploadFile.PicType.SitePIC))
{
//新建一个bmp图片
System.Drawing.Image bitmap = System.Drawing.Image.FromFile(strdir + fileid + "." + ExtName);
//新建一个画板
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
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);
System.Drawing.Image imagewater = System.Drawing.Image.FromFile(@"e:\images\watermark.gif");
g.DrawImage(imagewater,10,10,90,30);
g.Dispose();
ImageCodecInfo myImageCodecInfo;
System.Drawing.Imaging.Encoder myEncoder;
EncoderParameter myEncoderParameter;
EncoderParameters myEncoderParameters;
myImageCodecInfo = ImageCodecInfo.GetImageEncoders()[1];
myEncoder = System.Drawing.Imaging.Encoder.Quality;
myEncoderParameters = new EncoderParameters(1);
myEncoderParameter = new EncoderParameter(myEncoder, 97L); // 0-100
myEncoderParameters.Param[0] = myEncoderParameter;
//保存为一个临时文件
bitmap.Save(strdir + fileid + "." + ExtName + "1", myImageCodecInfo, myEncoderParameters);
bitmap.Dispose();
//删除原来上传的文件
System.IO.File.Delete(strdir + fileid + "." + ExtName);
//更改文件名
System.IO.File.Move(strdir + fileid + "." + ExtName + "1", strdir + fileid + "." + ExtName);
return true;
}
else
{
return false;
}
}
catch
{
return false;
}
}