跨平台插件开发的QT？

Question

I have a pre-existing application, that calls out into a plugin library. I want the plugin library to be developed in Qt, and to be able to display a Qt UI.

However, when I attempt to create a QWidget it complains that the QApplication needs to be created first.

Is it not possible to use Qt to develop cross platform plugins?
Eg a netscape plugin for Chrome or Firefox. I do not, and cannot, control the app's main loop.

Answer 1

如Qt文档中所述，任何使用Qt的GUI应用程序都需要将QApplication创建到主线程中，因为它包含所有信号引擎和事件循环。

Answer 2

There is Qt/MFC Migration Framework that can help you to build plugins if the main application where the plugin is laoded is Win32 or Mfc. Qt/MFC Migration Framework