opencv笔记（三十五）——MFC中如何刷新static控件

╰+哭是因爲堅強的太久メ 2022-05-13 13:26 596阅读 0赞

在MFC中用[缓存][Link 1]技术进行绘图完全可以做到不闪烁，下面是在[对话框][Link 2][应用程序][Link 3]OnPaint[函数][Link 4]else[分支][Link 5]中的[代码][Link 6]，显示一行[文本][Link 7]，仅用来测试：

CWnd * pWndShow;
    CDC * pDCShow;
    pWndShow = GetDlgItem(IDC_STC_DRAW); // static text控件ID
    pDCShow = pWndShow->GetDC();
    
    CDC memDC;
    CRect rect;
    CBitmap memBmp, *pOldBmp;
    pWndShow->GetClientRect(rect);
    memDC.CreateCompatibleDC(pDCShow);
    memBmp.CreateCompatibleBitmap(&memDC, rect.Width(), rect.Height());
    pOldBmp = memDC.SelectObject(&memBmp);
    
    // 更新窗口
    pWndShow->UpdateWindow();
    // 背景用白色填充
    memDC.FillSolidRect(rect, RGB(255,255,255));
    // 设置为透明模式
    memDC.SetBkMode(TRANSPARENT);
    memDC.TextOut(100, 100, 不能打双引号了);
    // 将内存DC中的内容拷贝到设备DC中
    pDCShow->BitBlt(0, 0, rect.Width(), rect.Height(), &memDC, 0, 0, SRCCOPY);
    
    // 清理
    memDC.SelectObject(pOldBmp);
    memBmp.DeleteObject();
    memDC.DeleteDC();
    pWndShow->ReleaseDC(pDCShow);

在你需要刷新的地方调用对话框的函数Invalidate(FALSE);就行了。例如你的[程序][Link 8]可以设置一个[一秒][Link 9]的[定时器][Link 10]，[在里面][Link 11]刷新窗口就行了。  
对于其他控件闪烁的情况，由于只在缓存中绘制了static text控件的[部分][Link 12]，所以应该只重写static text控件。在定时器中改为调用对话框的InvalidateRect函数，第一个[参数][Link 13]用static text控件在对话框中的位置，第二个参数同样用FALSE，具体[用法][Link 14]请参看MSDN或[百度百科][Link 15]。

转自：[https://wenda.so.com/q/1373595399063351][https_wenda.so.com_q_1373595399063351]

[Link 1]: http://www.so.com/s?q=%E7%BC%93%E5%AD%98&ie=utf-8&src=internal_wenda_recommend_textn
[Link 2]: http://www.so.com/s?q=%E5%AF%B9%E8%AF%9D%E6%A1%86&ie=utf-8&src=internal_wenda_recommend_textn
[Link 3]: http://www.so.com/s?q=%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F&ie=utf-8&src=internal_wenda_recommend_textn
[Link 4]: http://www.so.com/s?q=%E5%87%BD%E6%95%B0&ie=utf-8&src=internal_wenda_recommend_textn
[Link 5]: http://www.so.com/s?q=%E5%88%86%E6%94%AF&ie=utf-8&src=internal_wenda_recommend_textn
[Link 6]: http://www.so.com/s?q=%E4%BB%A3%E7%A0%81&ie=utf-8&src=internal_wenda_recommend_textn
[Link 7]: http://www.so.com/s?q=%E6%96%87%E6%9C%AC&ie=utf-8&src=internal_wenda_recommend_textn
[Link 8]: http://www.so.com/s?q=%E7%A8%8B%E5%BA%8F&ie=utf-8&src=internal_wenda_recommend_textn
[Link 9]: http://www.so.com/s?q=%E4%B8%80%E7%A7%92&ie=utf-8&src=internal_wenda_recommend_textn
[Link 10]: http://www.so.com/s?q=%E5%AE%9A%E6%97%B6%E5%99%A8&ie=utf-8&src=internal_wenda_recommend_textn
[Link 11]: http://www.so.com/s?q=%E5%9C%A8%E9%87%8C%E9%9D%A2&ie=utf-8&src=internal_wenda_recommend_textn
[Link 12]: http://www.so.com/s?q=%E9%83%A8%E5%88%86&ie=utf-8&src=internal_wenda_recommend_textn
[Link 13]: http://www.so.com/s?q=%E5%8F%82%E6%95%B0&ie=utf-8&src=internal_wenda_recommend_textn
[Link 14]: http://www.so.com/s?q=%E7%94%A8%E6%B3%95&ie=utf-8&src=internal_wenda_recommend_textn
[Link 15]: http://www.so.com/s?q=%E7%99%BE%E5%BA%A6%E7%99%BE%E7%A7%91&ie=utf-8&src=internal_wenda_recommend_textn
[https_wenda.so.com_q_1373595399063351]: https://wenda.so.com/q/1373595399063351