fillrgn.c

C#一个实例源代码

/*--------------------------------------------------
  FillRgn.c
  --------------------------------------------------*/
#include <windows.h>

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

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     static TCHAR szAppName[] = TEXT ("FillRgn") ;
     HWND         hwnd ;
     MSG          msg ;
     WNDCLASS     wndclass ;
     
     wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
     wndclass.lpfnWndProc   = MainWndProc ;
     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 ("FillRgn"),
                          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 MainWndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     HDC              hdc ;
     PAINTSTRUCT      ps ;
     HRGN             hrgnA, hrgnB, hrgnC;
     int              nCombineResult;
     HBRUSH           hbrA, hbrB, hbrC;


     switch (message)

     {
     case WM_PAINT :
          hdc = BeginPaint (hwnd, &ps) ;
 
     hrgnA=CreateRoundRectRgn( 50, 50, 150, 150, 30, 30 );
     hrgnB=CreateRoundRectRgn( 200, 25, 250, 175, 50, 50 );
     hrgnC=CreateRectRgn( 0, 0, 50, 50 );

     nCombineResult = CombineRgn(hrgnC, hrgnA, hrgnB, RGN_OR );

     hbrA=CreateSolidBrush( RGB(255, 0, 0) );  
     FillRgn( hdc,hrgnA, hbrA);      // rgnA Red Filled

     hbrB=CreateSolidBrush( RGB(0, 255, 0) );  
     FillRgn( hdc,hrgnB, hbrB);      // rgnB Green Filled
     hbrC=CreateSolidBrush( RGB(0, 0, 255) );  // rgnC Blue
     FrameRgn( hdc,hrgnC, hbrC, 2, 2 );

     DeleteObject(hrgnA);
     DeleteObject(hrgnB);
     DeleteObject(hrgnC);
     DeleteObject(hbrA);
     DeleteObject(hbrB);
     DeleteObject(hbrC);
		  
		  EndPaint (hwnd, &ps) ;
          return 0 ;

     case WM_DESTROY :
		 	  
    
		  PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}