保存小部件的屏幕截图 [英] Save the screenshot of a widget

问题描述

我想在 Qt 中保存一个小部件的屏幕截图.我创建了以下应该可以工作的代码:

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);

但不幸的是，这似乎不起作用.有谁知道是什么问题?

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

推荐答案

在 这个答案 和这个论坛帖子，人们建议如下:

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

很可能，您的应用程序找不到处理 .jpg 文件所需的插件.要解决此问题，请执行以下操作之一:

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:

• 如果您正在进行静态构建，请将 QTPLUGIN += qjpeg 添加到您的 .pro 文件或
• 如果您正在进行动态构建，请将 %QTDIR%\plugins 中的 imageformats 文件夹放在您的 .exe 旁边

• 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

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