得到屏幕大小，把窗口设置为全屛

      int m_xScreen = GetSystemMetrics(SM_CXSCREEN);

int m_yScreen = GetSystemMetrics(SM_CYSCREEN);

SetWindowLong(GetSafeHwnd(),GWL_EXSTYLE,WS_EX_TOOLWINDOW);SetLayeredWindow(m_hWnd，80);SetWindowPos(&CWnd::wndTopMost,0,0,m_xScreen,m_yScreen,SWP_SHOWWINDOW);SetForegroundWindow();

实现透明函数

void SetLayeredWindow(HWND m_hWnd,int nRate)

{HINSTANCE hInst;if ((hInst = LoadLibrary(_T("USER32.dll"))) != NULL)

    {

        SetWindowLong(m_hWnd, GWL_EXSTYLE, GetWindowLong(m_hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);typedef BOOL (WINAPI* lpfnSetTransparent)(HWND hWnd, COLORREF crKey, BYTE bAlpha, DWORD dwFlags);if (hInst){lpfnSetTransparent pFnSetTransparent = NULL;pFnSetTransparent= (lpfnSetTransparent)GetProcAddress(hInst, "SetLayeredWindowAttributes");if (pFnSetTransparent)pFnSetTransparent(m_hWnd, 0, (255 * nRate) / 100, LWA_ALPHA);}

    }

}