Save the screenshot of a widget

问题

I want to save a screenshot of a widget in Qt. I created the following code that should work:

  QWidget* activeWidget = getActiveWidget();//a function that returns the current widget.
  if (activeWidget == NULL)
  {
    return;
  }
  QPixmap screenshot;
  screenshot = QPixmap::grabWidget(activeWidget,activeWidget->rect());
  if(screenshot.isNull()){
    printf("ERROR");
  }
 bool a= screenshot.save("c:\\temp\\asd.jpg", "JPG", 50);

But unfortunately this does not seem to work. Does anyone know what the problem is?

回答1:

In this answer and this forum post, people suggest the following:

Most likely, the plugin which is required to handle .jpg files is not found by your application. In order to resolve this issue, do one of the following things:

• If you are doing a static build, add QTPLUGIN += qjpeg to your .pro file or
• if you are doing a dynamic build, put the imageformats folder from %QTDIR%\plugins next to your .exe

来源：https://stackoverflow.com/questions/11930201/save-the-screenshot-of-a-widget