将字符串写入图片

将字符串写入到图片中.

1 换行采用指定写入位置来实现

2 务必释放资源,否则会出现Win32Error 

 

  protected   void  Page_Load( object  sender, EventArgs e)
        {
             if  ( ! IsPostBack)
            {
                 // 前一页面传递过来的参数
                 string  email  =  Request.QueryString.Get( " email " );
                 string  realName  =   new  OLUserService.OLUserService().GetRealNameByEmail(email);
                 string  workid  =   new  OLUserService.OLUserService().GetWorkIdByEmail(email);

                 // image1图片控件-呈现写入字符串后的图片
                 string  fileName  =   this .image1.ImageUrl;
                 int  index  =  fileName.LastIndexOf( " . " );

                 string  newFileName  =  fileName.Substring( 0 , index)  +   " _ "   +  realName  +  fileName.Substring(index);
                FileInfo fileInfo  =   new  FileInfo(Server.MapPath(fileName));
                fileInfo.CopyTo(Server.MapPath(newFileName),  true );

                System.Drawing.Image image  =   new  Bitmap(Server.MapPath(newFileName));
                Graphics g  =  Graphics.FromImage(image);
                
                 string  s2  =   string .Format( " 通过了关于《集团商业行为准则》的{0} " , DateTime.Now.ToString( " yyyy " ));
                 string  s3  =   " 年度认证，特此证明。 " ;

                Font drawFont  =   new  Font( " Arial " ,  12 );
                SolidBrush drawBrush  =   new  SolidBrush(Color.Black);
                
                 // 通过指定写入位置实现换行功能
                drawPoint  =   new  PointF( 50 ,  200 );
                g.DrawString(s2, drawFont, drawBrush, drawPoint);

                drawPoint  =   new  PointF( 50 ,  230 );
                g.DrawString(s3, drawFont, drawBrush, drawPoint);
               

                System.Drawing.Image img  =   new  Bitmap(image);
                 // 此处尤为重要,使用资源后的释放.否则会出现Win32错误

                 // [ExternalException (0x80004005): A generic error occurred in GDI+.]

                g.Dispose();
                image.Dispose();

                img.Save(Server.MapPath(newFileName), System.Drawing.Imaging.ImageFormat.Jpeg);
                 this .image1.ImageUrl  =  newFileName;
            }
        }

 

 

 

 

 

转载于:https://www.cnblogs.com/zwwon/archive/2009/11/11/1600789.html