Asp.net 中將文字寫入圖片中

asp.net

/**//// <summary>
        /// 功能：將文字寫入圖片
        /// 日期：2006-11-20
        /// 作者：楊義賢
        /// </summary>
        /// <param name="strfileName">檔案名稱字</param>
        /// <param name="strtext">需要寫入的文字</param>
        private void TextToImage(string strfileName,string strtext)
        {
            if(!File.Exists(MapPath(strfileName)))
            {
                throw new FileNotFoundException("檔案不存在!");
            }
          
            if( strtext == string.Empty )
            {
                return;
            }
            //還需要判斷檔案類型是否為映像類型
            System.Drawing.Image image = System.Drawing.Image.FromFile(MapPath(strfileName));
            Bitmap bitmap = new Bitmap(image,image.Width,image.Height);
            Graphics grap = Graphics.FromImage(bitmap);
            float fontSize = 24.0f;             //字型大小
            float textWidth = strtext.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 = strtext.Length*(fontSize+12);
            float rectHeight = fontSize+8;
            string strFont;//定義字型類型
            //聲明矩形域
            RectangleF textArea = new RectangleF(rectX,rectY,rectWidth,rectHeight);
            strFont = ddlfont.SelectedItem.Text.ToString().Trim();
            Font font = new Font(strFont,fontSize);   //定義字型
            Brush whiteBrush = new SolidBrush(Color.White);   //白筆刷，畫文字用
            Brush blackBrush = new SolidBrush(Color.Transparent);   //黑筆刷，畫背景用

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

            grap.DrawString(strtext,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.//在這裡可以將產生後的圖片放大Oracle資料庫Power中
           
            Response.Clear();
            Response.ContentType = "image/jpeg";
            Response.BinaryWrite(ms.ToArray());
            grap.Dispose();
            bitmap.Dispose();
            image.Dispose();
        }
事件:

 

private void btnWrite_Click(object sender, System.EventArgs e)
        {
            HttpPostedFile httpPostFile;    //用戶端上傳檔案對象
            httpPostFile = DocUpload.PostedFile;
            string strTemp;
            string strFileName;//完成檔案名稱
            strTemp = httpPostFile.FileName.ToString().Trim();
            strFileName = GetRealFileName(strTemp);
            string strImg = "images/";
            TextToImage(strImg +strFileName,txtDocName.Text.ToString());

        }/**//// <summary>
        ///  功能：擷取檔案名稱
        ///  日期：2006-11-20
        ///  作者：楊義賢
        /// </summary>
        /// <param name="strPathName">檔案路徑</param>
        /// <returns></returns>
        public string GetRealFileName(string strPathName)
        {
            string [] strFileName = strPathName.Split('\');
            int iPos = strFileName.GetUpperBound(0);
            return strFileName[iPos];
        }