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This article mainly introduces Qt how to achieve screen recording control, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

I. Preface

In the usual writing process, it is often necessary to capture screenshots of some operation actions and effects into gif format to make the covered information more comprehensive and vivid. Sometimes the whole operation process and running effect can be recorded into MP4, but the file size is relatively large, and many websites are not easy to upload, basically support gif dynamic images, generally a 5-second gif,800*600 resolution, can be well controlled in 500KB In this way, it is more perfect to support the drive map on the major websites. At the beginning of the use of ScreenGif.exe, used for a long time, feel OK, after a friend recommended to use LICEcap.exe, smaller, higher compression ratio, and then later found that there is an open source gif.h class, which can be implemented by calling the method to merge multiple images into a gif, and is cross-platform, I personally successfully tested in WIN+UBUNTU. The original code was given by Hero Ni, and I improved it on this basis so that I can directly drag the size of the form to change the size of the screencap area. Added support for Qt4 and other compilers.

Main functions:

The width and height of the screen to be recorded can be set to support direct pull changes in the lower right corner.

Width that can be set to widen

The background color of the screencap control can be set.

The number of frames recorded can be set.

The recording area can be dragged freely.

2. Void GifWidget::saveImage () {if (! gifWriter) {return;} # if (QT_VERSION grabWindow (0, x () + rectGif.x (), y () + rectGif.y (), rectGif.width (), rectGif.height ()); QImage image = pix.toImage (). ConvertToFormat (QImage::Format_RGBA8888); # endif gif.GifWriteFrame (gifWriter, image.bits (), rectGif.width (), rectGif.height (), fps); count++ LabStatus- > setText (QString ("recording frame% 1") .arg (count);} void GifWidget::record () {if (btnStart- > text () = = "start") {if (0! = gifWriter) {delete gifWriter; gifWriter = 0 } / / File Save dialog box / / fileName = qApp- > applicationDirPath () + "/" + QDateTime::currentDateTime () .toString ("yyyy-MM-dd-hh-mm-ss.gif"); fileName = QFileDialog::getSaveFileName (this, "Select Save location", qApp- > applicationDirPath () + "/", "gif Picture (* .gif)") If (fileName.isEmpty ()) {return;} int width = txtWidth- > text (). ToInt (); int height = txtHeight- > text (). ToInt (); fps = txtFps- > text (). ToInt (); gifWriter = new Gif::GifWriter; bool bOk = gif.GifBegin (gifWriter, fileName.toLocal8Bit (). Data (), width, height, fps) If (! bOk) {delete gifWriter; gifWriter = 0; return;} count = 0; labStatus- > setText ("start recording..."); btnStart- > setText ("stop"); / / delayed startup timer- > setInterval (1000 / fps); QTimer::singleShot (1000, timer, SLOT (start () / / saveImage ();} else {timer- > stop (); gif.GifEnd (gifWriter); delete gifWriter; gifWriter = 0; labStatus- > setText (QString ("recording completed 1 frame") .arg (count)); btnStart- > setText ("start"); QDesktopServices::openUrl (QUrl (fileName));} third, effect

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