在ASP.NET中为图像加入版权信息

using System.Drawing;
using System.IO;
using System.Drawing.Imaging;

private void AddTextToImg(string fileName,string text)
{
 
if(!File.Exists(MapPath(fileName)))
 {
  
throw new FileNotFoundException("The file don't exist!");
 }

 
if( text == string.Empty )
 {
  
return;
 }
 
//还需要判断文件类型是否为图像类型,这里就不赘述了

 System.Drawing.Image image
= System.Drawing.Image.FromFile(MapPath(fileName));
 Bitmap bitmap
= new Bitmap(image,image.Width,image.Height);
 Graphics g
= Graphics.FromImage(bitmap);

 
float fontSize = 12.0f; //字体大小
 float textWidth = text.Length*fontSize; //文本的长度
 
//下面定义一个矩形区域,以后在这个矩形里画上白底黑字
 float rectX = 0;
 
float rectY = 0;
 
float rectWidth = text.Length*(fontSize+8);
 
float rectHeight = fontSize+8;
 
//声明矩形域
 RectangleF textArea = new RectangleF(rectX,rectY,rectWidth,rectHeight);

 Font font
= new Font("宋体",fontSize); //定义字体
 Brush whiteBrush = new SolidBrush(Color.White); //白笔刷,画文字用
 Brush blackBrush = new SolidBrush(Color.Black); //黑笔刷,画背景用

 g.FillRectangle(blackBrush,rectX,rectY,rectWidth,rectHeight);

 g.DrawString(text,font,whiteBrush,textArea);
 MemoryStream ms
= new MemoryStream( );
 
//保存为Jpg类型
 bitmap.Save(ms,ImageFormat.Jpeg);

 
//输出处理后的图像,这里为了演示方便,我将图片显示在页面中了
 Response.Clear();
 Response.ContentType
= "image/jpeg";
 Response.BinaryWrite( ms.ToArray() );

 g.Dispose(); 
 bitmap.Dispose();
 image.Dispose();
}

 

  调用时很简单,

  AddTextToImg("me.jpg","Family.Man");

posted on 2007-09-29 22:37  石川  阅读(186)  评论(0编辑  收藏  举报