WIN32程序最简单的双缓冲实例!

#pragma once ­

#include <windows.h> ­

#include   <stdio.h> ­

#include <tchar.h> ­

#include "resource.h" ­

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HINSTANCE hInst; ­

HBITMAP hBitmap;               //位图句柄 ­

HBITMAP hComBit;               //后台句柄(最终) ­

HDC hMenDc;                    //位图的内存环境句柄 ­

HDC hComDC;                    //后台的内存环境句柄(最终) ­

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//最简单的双缓冲实例 ­

//作者：刘 ­

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LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) ­

{ ­

int wmID,wmEvent; ­

PAINTSTRUCT ps; ­

HDC hdc;                    //实际屏幕环境句柄 ­

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switch (message) ­

{ ­

case WM_CREATE: ­

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  hMenDc= CreateCompatibleDC(NULL); ­

  hComDC=CreateCompatibleDC(NULL); ­

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  hBitmap=(HBITMAP)LoadImage(NULL,"BMP.BMP",IMAGE_BITMAP,0,0,LR_LOADFROMFILE); ­

  SelectObject(hMenDc,hBitmap); ­

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  hComBit = CreateCompatibleBitmap(hMenDc,1000,1000); ­

  SelectObject(hComDC,hComBit); ­

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  break; ­

case WM_LBUTTONUP: ­

  break; ­

case WM_MOUSEMOVE: ­

  break; ­

case WM_PAINT: ­

  hdc = BeginPaint(hWnd, &ps); ­

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  BitBlt(hComDC,0,0,1000,1000,hMenDc,0,0,SRCCOPY); ­

  BitBlt(hdc,0,0,1000,1000,hComDC,0,0,SRCCOPY); ­

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  EndPaint(hWnd, &ps); ­

  break; ­

case WM_DESTROY: ­

  PostQuitMessage(0); ­

  break; ­

default: ­

  return DefWindowProc(hWnd, message, wParam, lParam); ­

} ­

return 0; ­

} ­

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int APIENTRY _tWinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPTSTR lpCmdLine,int nCmdShow) ­

{ ­

WNDCLASSEX wcex; ­

wcex.cbSize = sizeof(WNDCLASSEX); ­

wcex.style   = CS_HREDRAW | CS_VREDRAW; ­

wcex.lpfnWndProc = (WNDPROC)WndProc; ­

wcex.cbClsExtra  = 0; ­

wcex.cbWndExtra  = 0; ­

wcex.hInstance  = hInstance; ­

wcex.hIcon   = NULL; ­

wcex.hCursor  = LoadCursor(NULL, IDC_ARROW); ­

wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); ­

wcex.lpszMenuName = NULL; ­

wcex.lpszClassName = "Ws_class"; ­

wcex.hIconSm  = NULL; ­

RegisterClassEx(&wcex); ­

HWND hWnd; ­

hInst = hInstance; ­

hWnd = CreateWindow("Ws_class", "My windows", WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL); ­

ShowWindow(hWnd, nCmdShow); ­

UpdateWindow(hWnd); ­

MSG msg; ­

while (GetMessage(&msg, NULL, 0, 0)) ­

{ ­

  TranslateMessage(&msg); ­

  DispatchMessage(&msg); ­

} ­

return (int) msg.wParam; ­

}­