在客户区绘画时闪烁 [英] Flickering while painting on the client area

问题描述

我创建了一个简单的Win32程序，它绘制存储在链表中的矩形。在WM_PAINT消息中，程序在循环中绘制链接列表中的所有节点（矩形）。问题是该程序有点闪烁。我发现程序很烦人。我现在正在使用双缓冲，但它的结果比我预期的要少。这是我的代码：

  case  WM_PAINT：
 
  //  获取窗口DC  
 hdc = BeginPaint（hwnd， &安培; PS）; 
 
  //  为双缓冲创建一个屏幕外的DC  
 hdcMem = CreateCompatibleDC（hdc）; 
 hbmMem = CreateCompatibleBitmap（hdc，win_width，win_height）; 
 
 hOld = SelectObject（hdcMem，hbmMem）; 
 
  //  在此处绘制到hdcMem  
  while （ / *  链接列表* / ）
 {
矩形（ / *   ... * / ）; 
  //   ....其他代码行 
} 
 
  //  将屏幕外DC转移到屏幕 
 BitBlt（ hdc， 0 ， 0 ，win_width，win_height，hdcMem， 0 ， 0 ，SRCCOPY）; 
 
  //  释放屏幕外的DC  
 SelectObject（hdcMem，hOld）; 
 DeleteObject（hbmMem）; 
 DeleteDC（hdcMem）; 
 
 EndPaint（hwnd，& ps）; 
 返回  0 ; 

以上代码出了什么问题？有没有更好的方法来使用GDI做这样的绘画？

解决方案

看到这个：



< a href =http://stackoverflow.com/questions/2473799/gdi-double-buffering-in-c> http://stackoverflow.com/questions/2473799/gdi-double-buffering-in-c [ ^ ]

I have created a simple Win32 program which paints rectangles stored in a linked list. In the WM_PAINT message the program paints all the nodes (rectangles) in the linked list in a loop. The problem is that the program flickers a bit. I found the program is annoying to use. I am using double buffering now, but it has less results that i expected. Here''s my code :

case WM_PAINT:
 
    // Get DC for window
    hdc = BeginPaint(hwnd, &ps);
 
    // Create an off-screen DC for double-buffering
    hdcMem = CreateCompatibleDC(hdc);
    hbmMem = CreateCompatibleBitmap(hdc, win_width, win_height);
 
    hOld   = SelectObject(hdcMem, hbmMem);
 
    // Draw into hdcMem here
	while(/*Linked list*/)
	{
		Rectangle(/*...*/);
		//.... other lines of code
	}
 
    // Transfer the off-screen DC to the screen
    BitBlt(hdc, 0, 0, win_width, win_height, hdcMem, 0, 0, SRCCOPY);
 
    // Free-up the off-screen DC
    SelectObject(hdcMem, hOld);
    DeleteObject(hbmMem);
    DeleteDC    (hdcMem);
 
    EndPaint(hwnd, &ps);
    return 0;

What''s wrong with the above code ? Is there a better way to do paintings like this using GDI ?

解决方案

See this:

http://stackoverflow.com/questions/2473799/gdi-double-buffering-in-c[^]

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