本文实例讲述了asp.net实现生成缩略图及给原始图加水印的方法。分享给大家供大家参考,具体如下:
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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);
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 ;
}
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希望本文所述对大家asp.net程序设计有所帮助。
原文链接:http://blog.csdn.net/happymagic/article/details/6880664