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How to get wid by the pid?

  • my application, I use QProcess to start a external program.
    the application have a window, and in the window, I create two buttons,
    when I click button1, it will use QProcess to start a external program and if I click button2, it will convert external program to my application.
    The Problem:
    when I use QProcess to start the external program, external program is in the top-level window, it cover my application window which have two buttons.
    can you help me? can you tell me how to switch external program to my application?
    I also want to get wid of the external program, but I read help document, I only can get pid of the external program.

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