win32程序,MessageBox弹出的框为什么不可点

[马少华]

HINSTANCE hInst;
INT_PTR CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
	_In_opt_ HINSTANCE hPrevInstance,
	_In_ LPWSTR    lpCmdLine,
	_In_ int       nCmdShow)
{
	hInst = hInstance;
	DialogBox(hInstance, MAKEINTRESOURCE(IDD_DIALOG_MAIN), NULL, WndProc);
	return 0;
}

INT_PTR CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	hMainDlg = hWnd;

	switch (message)
	{
	case WM_COMMAND:
	{
		int wmId = LOWORD(wParam);
		// 分析菜单选择: 
		switch (wmId)
		{
		case IDM_ABOUT:
			DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
			break;
		case IDM_EXIT:
			DestroyWindow(hWnd);
			break;
		case IDC_BUTTON_PE:
			MessageBox(hWnd, 0, 0, MB_OKCANCEL);
			break;
		default:
			return DefWindowProc(hWnd, message, wParam, lParam);
		}
	}
	break;
	case WM_PAINT:
	{
		PAINTSTRUCT ps;
		HDC hdc = BeginPaint(hWnd, &ps);
		// TODO: 在此处添加使用 hdc 的任何绘图代码...
		EndPaint(hWnd, &ps);
	}
	break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}

// “关于”框的消息处理程序。
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	UNREFERENCED_PARAMETER(lParam);
	switch (message)
	{
	case WM_INITDIALOG:
		return (INT_PTR)TRUE;

	case WM_COMMAND:
		if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
		{
			EndDialog(hDlg, LOWORD(wParam));
			return (INT_PTR)TRUE;
		}
		break;
	}
	return (INT_PTR)FALSE;
}

一个小的win32程序，主界面上有个按钮，ID ：IDC_BUTTON_PE，点这个按钮后弹出一个MessageBox,但这个MessageBox上的按钮不可点击。求解....

[Eleven]

把最后面的那个: default:         return DefWindowProc(hWnd, message, wParam, lParam);去掉

[马少华]

引用 1 楼 VisualEleven 的回复:

把最后面的那个: default:         return DefWindowProc(hWnd, message, wParam, lParam);去掉

确实messagebox可以点击，能详细讲讲么？ 还有一个问题，主窗口关不掉。