Win32 SDK基础(五)之关于窗口类的简单介绍(2)-木庄网络博客

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LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
    case WM_DESTROY:
        PostQuitMessage(0);//可以使GetMessage返回0
        break;
    default:
        break;
    }
    return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
 
 BOOL RegisterWindow()
{
    WNDCLASSEX wce = { 0 };
    wce.cbSize = sizeof(wce);
    wce.cbClsExtra = 0;
    wce.cbWndExtra = 0;
    wce.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wce.hCursor = NULL;
    wce.hIcon = NULL;
    wce.hIconSm = NULL;
    wce.hInstance = NULL;
    wce.lpfnWndProc = WndProc;
    wce.lpszClassName = "DllMain";
    wce.lpszMenuName = NULL;
    wce.style = CS_HREDRAW | CS_VREDRAW | CS_GLOBALCLASS;
    ATOM nAtom = RegisterClassEx(&wce);
    if (nAtom == 0)
        return FALSE;
    return true;
}

RegisterWindow()中注册的窗口类名称为"DllMain"，我们在dll的主函数中调用该注册函数完成注册：

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    ....
    RegisterWindow();
    return TRUE;
}
}

在我们的主程序中使用该窗口类创建窗口：

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
    _In_opt_ HINSTANCE hPrevInstance,
    _In_ LPWSTR    lpCmdLine,
    _In_ int       nCmdShow)
{
    ...
    HWND hWnd = CreateMain("DllMain", "我是一个Dll注册的窗口");
    Display(hWnd);
    Message();
    return 0;
}