asp.net生成缩略图及给原始图加水印

时间:2008-10-07 12:15:42  来源:第二电脑网上收集  作者:

  第二电脑网导读:0" cellpadding="6" width="95%" align="center" border="0">  using System.IO;   using System.Drawing.Imaging;   private void Button1_ServerClick(object sender, System.EventArgs e)   {   Graphics g=null;   System.Drawi...
  正文: ASP/ target=_blank class=infotextkey>asp.net生成缩略图及给原始图加水印,代码如下:

  using System.IO;
  using System.Drawing.Imaging;
  private void Button1_ServerClick(object sender, System.EventArgs e)
  {
  Graphics g=null;
  System.Drawing.Image upimage=null;
  System.Drawing.Image thumimg=null;
  System.Drawing.Image simage=null;
  Bitmap outputfile=null;
  try
  {
  string extension = Path.GetExtension(File1.PostedFile.FileName).ToUpper();
  string filename = DateTime.Now.ToString("yyyyMMddhhmmss");
  string smallpath = Server.MapPath(".")+"/smallimg/";
  string bigpath = Server.MapPath(".")+"/bigimg/";
  int width,height,newwidth,newheight;
  System.Drawing.Image.GetThumbnailImageAbort callb =new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
  if(!Directory.Exists(smallpath))
  Directory.CreateDirectory(smallpath);
  if(!Directory.Exists(bigpath))
  Directory.CreateDirectory(bigpath);
  Stream upimgfile = File1.PostedFile.InputStream;
  string simagefile = Server.MapPath("a8logo.jpg"); //要加水印的文件
  simage=System.Drawing.Image.FromFile(simagefile);
  upimage= System.Drawing.Image.FromStream(upimgfile); //上传的图片
  width = upimage.Width;
  height = upimage.Height;
  if(width>height)
  {
  newwidth=200;
  newheight =(int)((double)height/(double)width * (double)newwidth);
  }
  else
  {
  newheight=200;
  newwidth=(int)((double)width/(double)height * (double)newheight);
  }
  thumimg = upimage.GetThumbnailImage(newwidth,newheight,callb,IntPtr.Zero);
  outputfile=new Bitmap(upimage);
  g=Graphics.FromImage(outputfile);
  g.DrawImage(simage,new Rectangle(upimage.Width-simage.Width,upimage.Height-simage.Height,upimage.Width,upimage.Height),0,0,upimage.Width,upimage.Height,GraphicsUnit.Pixel);
  string newpath = bigpath + filename + extension; //原始图路径
  string thumpath = smallpath + filename + extension; //缩略图路径
  outputfile.Save(newpath);
  thumimg.Save(thumpath);
  outputfile.Dispose();
  }
  catch(Exception ex)
  {
  throw ex;
  }
  finally
  {
  if(g!=null)
  g.Dispose();
  if(thumimg!=null)
  thumimg.Dispose();
  if(upimage!=null)
  upimage.Dispose();
  if(simage!=null)
  simage.Dispose();
  }
  }
  public bool ThumbnailCallback()
  {
  return false;
  }


asp.net生成缩略图及给原始图加水印》由第二电脑网原创提供,转载请注明:http://www.002pc.com/master/College/Programming/ASP/2008-10-07/3297.html


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