Windows窗体类消息处理

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I. 窗体类消息处理

1. 在WndProc中调用窗体类的方法：

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

a. 将WndProc声明为窗体类中的静态函数；

b. 在创建窗体时，先用SetWindowLong( HWND hWnd, int nIndex, LONG dwNewLong )在窗体中保存窗体实例的指针；

c. 在WndProc中用LONG GetWindowLong(HWND hWnd, int nIndex) 取得窗体类指针。

class COwner{...public:BOOL CreateWindow(HWND hWndParent, int nCmdShow);static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);...}BOOL COwner::CreateWindow(HWND hWndParent, int nCmdShow){m_hWnd = CreateWindow(szWindowClass, szTitle, WS_POPUP,m_rect.left, m_rect.top, Width(), Height(), hWndParent, NULL, m_hInstance, this);if (!m_hWnd){return FALSE;}::SetWindowLong( m_hWnd, GWL_USERDATA, (LONG)this);ShowWindow(m_hWnd, nCmdShow);return TRUE;}LRESULT CALLBACK COwner::WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){COwner *pOwner = (COwner *)GetWindowLong(hWnd, GWL_USERDATA);//Call function of COwner from pOwner to access the owner...}