mfc 标签控件怎么设置透明

if(nCtlColor!= CTLCOLOR_DLG) //如果是静态标签 在这里， CTLCOLOR_DLG应该是用控件ID，并且对静态框，不能用默认ID的IDC_STATIC，必须改名。 另外，不是所有控件都可以用这种方式改背景透明，静态框、编辑框、简单列表框可以，按钮不行。

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 hInstif ((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 = NULLpFnSetTransparent= (lpfnSetTransparent)GetProcAddress(hInst, "SetLayeredWindowAttributes")if (pFnSetTransparent)pFnSetTransparent(m_hWnd, 0, (255 * nRate) / 100, LWA_ALPHA)}

    }

}

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