对CWnd类的模拟

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孙鑫用模拟CWnd类来说明类对象和窗口资源的关系: 通过m_hWnd来联系.

class CWnd
{
public:

CWnd()

{

m_hWnd=NULL;

}
BOOL CreateEx(

                                    DWORD dwExStyle,      // extended window style
                                   LPCTSTR lpClassName, // pointer to registered class   name
                                   LPCTSTR lpWindowName, // pointer to window name
                                   DWORD dwStyle,        // window style
                                    int x,                // horizontal position of window
                                    int y,                // vertical position of window
                                    int nWidth,           // window width
                                    int nHeight,          // window height
                                    HWND hWndParent,      // handle to parent or owner window
                                    HMENU hMenu,          // handle to menu, or child-window identifier
                                    HINSTANCE hInstance, // handle to application instance
                                    LPVOID lpParam        // pointer to window-creation data

);

BOOL ShowWindow(int nCmdShow);

BOOL UpdateWindow();

public:

HWND m_hWnd;

};

BOOL CWnd::CreateEx(

)

{

m_hWnd=::CreateWindowEx(dwExStyle, lpClassName,lpWindowName, dwStyle,

x,y, nWidth,nHeight, hWndParent,hMenu, hInstance, lpParam );

if(m_hWnd)

return TRUE;

else

return FALSE;

}

BOOL CWnd::ShowWindow(int nCmdShow)

{

return ::ShowWindow(m_hWnd,nCmdShow);

}

BOOL CWnd:: UpdateWindow()

{

return ::UpdateWindow(m_hWnd);

}

int WINAPI WinMain(  HINSTANCE hInstance,  // handle to current instance  HINSTANCE hPrevInstance,  // handle to previous instance  LPSTR lpCmdLine,      // pointer to command line  int nCmdShow          // show state of window)

   ......

    CWnd   wnd;

    wnd.CreateEx(...);

    wnd.ShowWindow(SW_SHOWNORMAL);

    wnd.UpdateWindow();

    原来利用API的调拥

    HWND   hWnd;

    hWnd=::CreateWindowEx(...);

    ::ShowWindow(hWnd,SW_SHOWNORMAL);

    ::UpdateWindow(hWnd);

.....