在图片上写字

下面的代码实现了从剪贴板取出图片，然后写上字，保存到文件

Image bmap;
 IDataObject data = System.Windows.Forms.Clipboard.GetDataObject();
 bmap = (Image)(data.GetData(typeof(System.Drawing.Bitmap)));
 Graphics g = Graphics.FromImage(bmap);
 SolidBrush drawBrush = new SolidBrush(Color.Red);
 Font drawFont = new Font("Arial", 10, FontStyle.Bold, GraphicsUnit.Millimeter);
 int xPos = bmap.Height - ( bmap.Height-25 );
 int yPos = 3;
    
 g.DrawString ("zydzydyzydydydyyydydy", drawFont, drawBrush, xPos, yPos);
 string sPicPath  = "d:\\filename.jpg";
 string sPreFix  = "d:\\xxx";
 Image smBmap ;
 smBmap = bmap.GetThumbnailImage(bmap.Width, bmap.Height, null, System.IntPtr.Zero);
 smBmap.Save(sPicPath, System.Drawing.Imaging.ImageFormat.Jpeg);
 bmap.Save(sPreFix + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
 bmap = null;
 smBmap = null;