BaseWindow简单windows窗口实例

#include<windows.h>
template <class DERIVED_TYPE>


class BaseWindow
{
public:
static LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
DERIVED_TYPE *pThis = NULL;


if (uMsg == WM_NCCREATE)
{
CREATESTRUCT* pCreate = (CREATESTRUCT*)lParam;
pThis = (DERIVED_TYPE*)pCreate->lpCreateParams;
SetWindowLongPtr(hwnd, GWLP_USERDATA, (LONG_PTR)pThis);


pThis->m_hwnd = hwnd;
}
else
{
pThis = (DERIVED_TYPE*)GetWindowLongPtr(hwnd, GWLP_USERDATA);
}
if (pThis)
{
return pThis->HandleMessage(uMsg, wParam, lParam);
}
else
{
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
}


BaseWindow() : m_hwnd(NULL) { }


BOOL Create(
PCWSTR lpWindowName,
DWORD dwStyle,
DWORD dwExStyle = 0,
int x = CW_USEDEFAULT,
int y = CW_USEDEFAULT,
int nWidth = CW_USEDEFAULT,
int nHeight = CW_USEDEFAULT,
HWND hWndParent = 0,
HMENU hMenu = 0
)
{
WNDCLASS wc = { 0 };


wc.lpfnWndProc = DERIVED_TYPE::WindowProc;
wc.hInstance = GetModuleHandle(NULL);
wc.lpszClassName = ClassName();


RegisterClass(&wc);


m_hwnd = CreateWindowEx(
dwExStyle, ClassName(), lpWindowName, dwStyle, x, y,
nWidth, nHeight, hWndParent, hMenu, GetModuleHandle(NULL), this
);


return (m_hwnd ? TRUE : FALSE);
}


HWND Window() const { return m_hwnd; }


protected:


virtual PCWSTR  ClassName() const = 0;
virtual LRESULT HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam) = 0;


HWND m_hwnd;
};
class MainWindow : public BaseWindow<MainWindow>
{
public:
PCWSTR  ClassName() const { return L"Sample Window Class"; }
LRESULT HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam);
};


LRESULT MainWindow::HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_DESTROY:
PostQuitMessage(0);
return 0;


case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(m_hwnd, &ps);
FillRect(hdc, &ps.rcPaint, (HBRUSH)(COLOR_WINDOW + 1));
EndPaint(m_hwnd, &ps);
}
return 0;


default:
return DefWindowProc(m_hwnd, uMsg, wParam, lParam);
}
return TRUE;
}


int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
{
MainWindow win;


if (!win.Create(L"Learn to Program Windows", WS_OVERLAPPEDWINDOW))
{
return 0;
}


ShowWindow(win.Window(), nCmdShow);


// Run the message loop.


MSG msg = {};
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}


return 0;
}