在ASP.NET 中为图像加入版权信息
4 月 04
计算机与 Internet 在ASP.NET 中为图像加入版权信息已关闭评论
using System.Drawing;

using System.IO;

using System.Drawing.Imaging;


private void AddTextToImg(string fileName,string text)

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{
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if(!File.Exists(MapPath(fileName)))
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{
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throw new FileNotFoundException("The file don’t exist!");
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}
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if( text == string.Empty )
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{
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return;
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}
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//还需要判断文件类型是否为图像类型,这里就不赘述了
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System.Drawing.Image image = System.Drawing.Image.FromFile(MapPath(fileName));
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Bitmap bitmap = new Bitmap(image,image.Width,image.Height);
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Graphics g = Graphics.FromImage(bitmap);
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float fontSize = 12.0f; //字体大小
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float textWidth = text.Length*fontSize; //文本的长度
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//下面定义一个矩形区域,以后在这个矩形里画上白底黑字
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float rectX = 0;
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float rectY = 0;
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float rectWidth = text.Length*(fontSize+8);
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float rectHeight = fontSize+8;
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//声明矩形域
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RectangleF textArea = new RectangleF(rectX,rectY,rectWidth,rectHeight);
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Font font = new Font("宋体",fontSize); //定义字体
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Brush whiteBrush = new SolidBrush(Color.White); //白笔刷,画文字用
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Brush blackBrush = new SolidBrush(Color.Black); //黑笔刷,画背景用
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g.FillRectangle(blackBrush,rectX,rectY,rectWidth,rectHeight);
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g.DrawString(text,font,whiteBrush,textArea);
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MemoryStream ms = new MemoryStream( );
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//保存为Jpg类型
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bitmap.Save(ms,ImageFormat.Jpeg);
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//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
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Response.Clear();
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Response.ContentType = "image/jpeg";
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Response.BinaryWrite( ms.ToArray() );
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g.Dispose();
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bitmap.Dispose();
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image.Dispose();
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}
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