gdisetbatchlimit.cpp

C#一个实例源代码

// GdiSetBatchLimit.cpp : Defines the entry point for the application.
//

#include "stdafx.h"

 

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     static TCHAR szAppName[] = TEXT ("SineWave") ;
     HWND         hwnd ;
     MSG          msg ;
     WNDCLASS     wndclass ;
     
     wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
     wndclass.lpfnWndProc   = WndProc ;
     wndclass.cbClsExtra    = 0 ;
     wndclass.cbWndExtra    = 0 ;
     wndclass.hInstance     = hInstance ;
     wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
     wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
     wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
     wndclass.lpszMenuName  = NULL ;
     wndclass.lpszClassName = szAppName ;
          
     if (!RegisterClass (&wndclass))
     {
          MessageBox (NULL, TEXT ("Program requires Windows NT!"), 
                      szAppName, MB_ICONERROR) ;
          return 0 ;
     }
     
     hwnd = CreateWindow (szAppName, TEXT ("Testing Ellipse"),
                          WS_OVERLAPPEDWINDOW,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          NULL, NULL, hInstance, NULL) ;

     ShowWindow (hwnd, iCmdShow) ;
     UpdateWindow (hwnd) ;
     
     while (GetMessage (&msg, NULL, 0, 0))
     {
          TranslateMessage (&msg) ;
          DispatchMessage (&msg) ;
     }
     return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
 
     HDC         hdc ;
     int         i ;
     PAINTSTRUCT ps ;
	 RECT rect;
//	 HWND         hwnd ;
  
     switch (message)
     {
 
     case WM_PAINT:
		 rect.left=rect.top=30;
		 rect.right=rect.bottom=200;
          hdc = BeginPaint (hwnd, &ps) ;
		  GdiSetBatchLimit(3000);
		  int i,ret;
		  for(i=0;;i++)
		  {
			  GetClientRect(hwnd, &rect);
			  FillRect(hdc, &rect, (HBRUSH)GetCurrentObject(hdc, OBJ_BRUSH));

			  for(ret=0; ret<20; ret++)
			  {
				  rect.left=rect.top=ret*10;
				  rect.right=rect.left+60;
				  rect.bottom=rect.top+60;
				  DrawFrameControl(hdc, &rect, DFC_BUTTON,DFCS_BUTTONPUSH);
			  }
		  
		  }
           return 0 ;   
     case WM_DESTROY:
          PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}