对CWnd类的模拟
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(
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
)
{
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);.....}