在Asp.net中為映像加入著作權資訊

摘至:http://dev.csdn.net/author/starchenzhi/506a6b59aaa04542ae1df3c007184a36.html

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;
            }
            //還需要判斷檔案類型是否為映像類型，這裡就不贅述了

            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;             //字型大小
            float textWidth = text.Length*fontSize;  //文本的長度
            //下面定義一個矩形地區，以後在這個矩形裡畫上白底黑字
            float rectX = 0;       
            float rectY = 0;
            float rectWidth = text.Length*(fontSize+8);
            float rectHeight = fontSize+8;
            //聲明矩形域
            RectangleF textArea = new RectangleF(rectX,rectY,rectWidth,rectHeight);

            Font font = new Font("宋體",fontSize);   //定義字型
            Brush whiteBrush = new SolidBrush(Color.White);   //白筆刷，畫文字用
            Brush blackBrush = new SolidBrush(Color.Black);   //黑筆刷，畫背景用

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

            g.DrawString(text,font,whiteBrush,textArea);
            MemoryStream ms = new MemoryStream( );
            //儲存為Jpg類型
            bitmap.Save(ms,ImageFormat.Jpeg);

            //輸出處理後的映像，這裡為了示範方便，我將圖片顯示在頁面中了
            Response.Clear();
            Response.ContentType = "image/jpeg";
            Response.BinaryWrite( ms.ToArray() );

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

調用時很簡單，
AddTextToImg("me.jpg","小智");