extracticon.c

C#一个实例源代码

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

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     static TCHAR szAppName[] = TEXT ("ExtractIcon") ;
     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(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 ("ExtractIcon"),
                          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     hIcon1;       // icon handle 
     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) ;

            // Extract Icon from file 
           ExtractIconEx(TEXT("MyIcon.ico"),0,&hIcon1,NULL,1); 
            // 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, hIcon1) ;
          EndPaint (hwnd, &ps) ;
          return 0 ;

     case WM_DESTROY:

		  DestroyIcon(hIcon1);

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