drawicon.c

C#一个实例源代码

/*---------------------------------------------------
   DrawIcon.c
---------------------------------------------------*/
#include <windows.h>
#include "resource.h"
HINSTANCE hInst;
HCURSOR hIcon;
LRESULT CALLBACK MainWndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     static TCHAR szAppName[] = TEXT ("DrawIcon") ;
     HWND         hwnd ;
     MSG          msg ;
     WNDCLASS     wndclass ;
	 hInst=hInstance;

     
     wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
     wndclass.lpfnWndProc   = MainWndProc ;
     wndclass.cbClsExtra    = 0 ;
     wndclass.cbWndExtra    = 0 ;
     wndclass.hInstance     = hInstance ;
     wndclass.hIcon         =LoadIcon(hInstance,MAKEINTRESOURCE(IDI_MYICON));
     wndclass.hCursor       =LoadCursorFromFile (TEXT("MyCursor.cur")) ;
     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 ("Draw Icon"),
                          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)
{
     static int       cxIcon, cyIcon, cxClient, cyClient ;
     HDC              hdc ;
     PAINTSTRUCT      ps ;
     static HICON     hIcon;       // icon handle 
     HINSTANCE        hExe;     // handle to loaded .EXE file 
     HRSRC            hResource;    // handle for FindResource  
     HRSRC            hMem;         // handle for LoadResource 
     BYTE             *lpResource;   // pointer to resource data  
     int              nID;            // ID of resource that best fits current screen 
     int              x, y ;
     
     switch (message)
     {
     case WM_CREATE:
          cxIcon = GetSystemMetrics (SM_CXICON) ;
          cyIcon = GetSystemMetrics (SM_CYICON) ;
          return 0 ;

     case WM_SIZE:
          cxClient = LOWORD (lParam) ;
          cyClient = HIWORD (lParam) ;
          return 0 ;

     case WM_PAINT:
          hdc = BeginPaint (hwnd, &ps) ;

          // Load the file from which to copy the icon. 
          hExe = LoadLibrary("DrawIcon.exe"); 
 
          // Find the icon directory whose identifier is 440. 
          hResource = FindResource(hExe,MAKEINTRESOURCE(IDI_MYICON), RT_GROUP_ICON); 
 
          // Load and lock the icon directory. 
          hMem = LoadResource(hExe, hResource); 
          lpResource = LockResource(hMem); 
 
          // Get the identifier of the icon that is most appropriate 
          // for the video display. 
 
          nID = LookupIconIdFromDirectoryEx((PBYTE) lpResource, TRUE, 
          SM_CXICON , SM_CYICON , LR_DEFAULTCOLOR); 
 
          // Find the bits for the nID icon. 
 
          hResource = FindResource(hExe, MAKEINTRESOURCE(nID),MAKEINTRESOURCE(RT_ICON)); 
 
           // Load and lock the icon. 
           hMem = LoadResource(hExe, hResource); 
 
           lpResource = LockResource(hMem); 
 
            // Create a handle to the icon. 
 
           hIcon = CreateIconFromResourceEx((PBYTE) lpResource,  SizeofResource(hExe, hResource), TRUE, 0x00030000,  SM_CXICON , SM_CYICON , LR_DEFAULTCOLOR); 
 
            // Draw the icon in the client area. 
 
           for (y = 0 ; y < cyClient ; y += cyIcon)
               for (x = 0 ; x < cxClient ; x += cxIcon)
                    DrawIcon (hdc, x, y, hIcon) ;
          EndPaint (hwnd, &ps) ;
          return 0 ;

     case WM_DESTROY:

		  DestroyIcon(hIcon);
          PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}