GDI+螢幕截圖程式

最近在整理以前的的開發資料，發現了過去開發過程中寫的不少程式還比較有意思，特此一一整理，以備後用

命名空間

using System.Drawing.Imaging;
using DCOMExtLib;
using System.Runtime.InteropServices; 

方法

[DllImport("gdi32.dll")]
  private static extern IntPtr CreateDC(
   string lpszDriver, // 驅動名稱
   string lpszDevice, // 裝置名稱
   string lpszOutput,    IntPtr lpInitData); 

   [DllImport("gdi32.dll")]
  private static extern bool BitBlt(
    IntPtr hdcDest , //目標裝置的控制代碼
    int nXDest ,     int nYDest ,     int nWidth ,     int nHeight ,     IntPtr hdcSrc ,     int nXSrc ,     int nYSrc , 
    System.Int32 dwRop );

畫圖部分

IntPtr pt=CreateDC("DISPLAY",null,null,(IntPtr) null);
   Graphics g1 = Graphics.FromHdc(pt);
   Bitmap b2 = new Bitmap (Screen.PrimaryScreen.Bounds.Width,
    Screen.PrimaryScreen.Bounds.Height,g1);
   Graphics g2 = Graphics.FromImage(b2);
   IntPtr dc1 = g1.GetHdc();
   IntPtr dc2 = g2.GetHdc();
   BitBlt(dc2,0,0,Screen.PrimaryScreen.Bounds.Width,
    Screen.PrimaryScreen.Bounds.Height,
    dc1,0,0,13369376);
   g1.ReleaseHdc(dc1);
   g2.ReleaseHdc(dc2);
   b2.Save("c://test.bmp",ImageFormat.Bmp);