C#+ GDI + BitBlt [英] C# + GDI + BitBlt

问题描述

朋友们，

 

有一个代码:

 

 

using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;


 public class Test : Form
 {
   public static long SRCINVERT = 0x00660046;
   [DllImport("gdi32.dll")]
   public static extern bool BitBlt(
    IntPtr hdcDest, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hdcSrc, 
           int nXSrc, int nYSrc, long dwRop);
   [DllImport("gdi32.dll", EntryPoint = "SelectObject")]
   public static extern IntPtr SelectObject(IntPtr hdc, IntPtr h);

   public void TestXOR()
   {
    Bitmap test = new Bitmap(100, 100);
    Graphics g = Graphics.FromImage(test);
    g.DrawLine(Pens.White, new Point(0, 0), new Point(100, 100));
    test.Save(@"c:\testBefore.bmp", ImageFormat.Bmp);
    IntPtr testHDC = g.GetHdc();
    SelectObject(testHDC, test.GetHbitmap());
    BitBlt(testHDC, 0, 0, 100, 100, testHDC, 0, 0, SRCINVERT);
    g.ReleaseHdc(testHDC);
    test.Save(@"c:\testAfter.bmp", ImageFormat.Bmp);
    g.Dispose();
   }

   static void Main(string[] args)
   {
    Test tst = new Test();
    tst.TestXOR();
    tst.Dispose();

   }

 }

推荐答案

此XOR适用于C ++应用，但不适用于c#

This XOR works on C++ app, but not c#

 

将为正确的解决方案支付50

Will pay 50

；)

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