yaosansi's Blog

<script language="JavaScript" >

var flag=false;

function changeImg(ImgD,iwidth,iheight){

  var image=new Image();

  image.src=ImgD.src;

  if(image.width>0 && image.height>0){

  flag=true;

  if(image.width/image.height>= iwidth/iheight){

  if(image.width>iwidth){  

  ImgD.width=iwidth;

  ImgD.height=(image.height*iwidth)/image.width;

  }else{

  ImgD.width=image.width;  

  ImgD.height=image.height;

  }

  ImgD.alt=image.width+"×"+image.height;

  }

  else{

  if(image.height>iheight){  

  ImgD.height=iheight;

  ImgD.width=(image.width*iheight)/image.height;   

  }else{

  ImgD.width=image.width;  

  ImgD.height=image.height;

  }

  ImgD.alt=image.width+"×"+image.height;

  }

  }

}  

</script>

public static byte[] ResizeImageFile(byte[] imageFile, int targetSizeW, int targetSizeH)

{

   System.Drawing.Image original = System.Drawing.Image.FromStream(new MemoryStream(imageFile));

   int targetH, targetW;

   targetW = targetSizeW;

   targetH = (int)(original.Height * ((float)targetSizeW / (float)original.Width));

   if (targetH > targetSizeH)

   {

      targetH = targetSizeH;

      targetW = (int)(original.Width * ((float)targetSizeH / (float)original.Height));

   }

   if (targetSizeW < (int)original.Width || targetSizeH < (int)original.Height)

   {

      System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(new MemoryStream(imageFile));

      // Create a new blank canvas.  The resized image will be drawn on this canvas.

      Bitmap bmPhoto = new Bitmap(targetW, targetH, PixelFormat.Format24bppRgb);

      bmPhoto.SetResolution(72, 72);

      Graphics grPhoto = Graphics.FromImage(bmPhoto);

      grPhoto.SmoothingMode = SmoothingMode.AntiAlias;

      grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic;

      grPhoto.PixelOffsetMode = PixelOffsetMode.HighQuality;

      grPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, targetW, targetH), 0, 0, original.Width, original.Height, GraphicsUnit.Pixel);

      // Save out to memory and then to a file.  We dispose of all objects to make sure the files don't stay locked.

      MemoryStream mm = new MemoryStream();

      bmPhoto.Save(mm, System.Drawing.Imaging.ImageFormat.Jpeg);

      original.Dispose();

      imgPhoto.Dispose();

      bmPhoto.Dispose();

      grPhoto.Dispose();

      return mm.GetBuffer();

   }

   else

   {

      return imageFile;

   }

}