MFC设置透明窗口

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)}

    }

}

在其父窗口中响应OnCtlColor

然后添加如下代码

HBRUSH CMyDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)

{

HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor)

if (nCtlColor==CTLCOLOR_STATIC)

{

pDC->SetTextColor(RGB(255,0,0))//字体颜色

pDC->SetBkMode(TRANSPARENT)// 背景透明

}

return hbr

}

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