C#上传文件带缩略图、带水印(转载)
C#上传文件带缩略图、带水印(转载)
Author :Vinceyu
Mail:vinspt928@sina.com
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upload.aspx
<HTML> <HEAD> <title>upload</title> <meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR"> <meta content="C#" name="CODE_LANGUAGE"> <meta content="JavaScript" name="vs_defaultClientScript"> <meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema"> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" encType="multipart/form-data" runat="server"> <INPUT id="fileUpload" type="file" name="filUpload" runat="server"> <asp:Button id="btnUpload" runat="server" Text="Upload" Width="96px" Height="48px"></asp:Button> <asp:Image id="imgPicture" runat="server" Width="160px" Height="120px"></asp:Image> <asp:Label id="lblOutput" runat="server" Width="240px" Height="112px"></asp:Label> </form> </body> </HTML> upload.asp.cs
private void btnUpload_Click(object sender, System.EventArgs e)
{
string NormalDirectory; //正常图片存放路径 string SmallDirectory; //缩略图片存放路径 string FileName; //图片文件名 string ExtendName; //图片扩展名 int ThumbWidth; //缩略图宽度 int ThumbHeight; //缩略图高度 //设置初始值 NormalDirectory = "/Picture/Products/Normal/"; SmallDirectory = "/Picture/Products/Small/"; ExtendName = System.IO.Path.GetExtension(fileUpload.PostedFile.FileName); FileName = DateTime.Now.ToString("yyMMddhhmmssff"); ThumbWidth = 130; ThumbHeight = 130; //判断路径上传是否网站 if (NormalDirectory.Substring(NormalDirectory.Length-1,1) != "/") NormalDirectory = NormalDirectory + "/"; if (SmallDirectory.Substring(SmallDirectory.Length-1,1) != "/") SmallDirectory = SmallDirectory + "/"; //判断目录是否存在 if (!Directory.Exists(Server.MapPath(NormalDirectory))) Directory.CreateDirectory(Server.MapPath(NormalDirectory)); if (!Directory.Exists(Server.MapPath(SmallDirectory))) Directory.CreateDirectory(Server.MapPath(SmallDirectory)); //如果存在上传文件 if (fileUpload.PostedFile != null)
{
HttpPostedFile myFile = fileUpload.PostedFile; int nFileLen = myFile.ContentLength; byte[] myData = new Byte[nFileLen]; myFile.InputStream.Read(myData,0,nFileLen); //myFile. // 加水印------------------------------------------------------------> float[][] matrixItems ={ new float[] {1, 0, 0, 0, 0}, new float[] {0, 1, 0, 0, 0}, new float[] {0, 0, 1, 0, 0}, new float[] {0, 0, 0, (float)20/100f, 0}, new float[] {0, 0, 0, 0, 1}}; ColorMatrix colorMatrix = new ColorMatrix(matrixItems); ImageAttributes imgAttr= new ImageAttributes(); imgAttr.SetColorMatrix(colorMatrix,ColorMatrixFlag.Default,ColorAdjustType.Bitmap); string wImageFile = Server.MapPath("1.gif"); // 要加的水印图 Image sImage = Image.FromStream(myFile.InputStream); // 从 Http 输入流创建 image Image wImage = Image.FromFile(wImageFile); // 绘图 Graphics g = Graphics.FromImage(sImage); g.DrawImage(wImage, new Rectangle(0, 0, wImage.Width, wImage.Height),-12,-4, wImage.Width+12, wImage.Height+4, GraphicsUnit.Pixel,imgAttr); // 保存，并将 image 转化为 byte[] MemoryStream ms= new MemoryStream(); byte[] myImage=null; sImage.Save(ms, ImageFormat.Jpeg); myImage = ms.GetBuffer(); //------------------------------------------------------------------> System.IO.FileStream newFile = new System.IO.FileStream(Server.MapPath(NormalDirectory + FileName + ExtendName), System.IO.FileMode.Create); newFile.Write(myImage,0, myImage.Length); newFile.Close(); System.Drawing.Image.GetThumbnailImageAbort myCallBack = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback); Bitmap myBitmap; try { myBitmap = new Bitmap(myFile.InputStream); System.Drawing.Image myThumbnail = myBitmap.GetThumbnailImage(ThumbWidth, ThumbHeight, myCallBack, IntPtr.Zero); myThumbnail.Save(Server.MapPath(SmallDirectory + FileName + ExtendName),System.Drawing.Imaging.ImageFormat.Jpeg); imgPicture.ImageUrl = SmallDirectory + FileName + ExtendName; lblOutput.Text = "File uploaded successfully!"; myThumbnail.Dispose(); myBitmap.Dispose();
} catch (ArgumentException errArgument) { lblOutput.Text = ""; System.IO.File.Delete(Server.MapPath(SmallDirectory + FileName + ExtendName)); } }
} public bool ThumbnailCallback() { return false; }