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Thread: plugin accessing data from qApp

  1. #1
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    Default plugin accessing data from qApp

    Plugins are normally made for accessing plugin methods in the main program.

    Now I have an application, where the plugin needs to call a method from the main program.
    How is this done?
    I have a working solution using QMetaObject::invoke(),, but using this is rather complex.

    Is there an easier way to call an application method from within the plugin?

  2. #2
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    Default Re: plugin accessing data from qApp

    You can always specify a host API and give an object implementing that API to the plugin object.

    E.g.
    Qt Code:
    1. class HostApi
    2. {
    3. public:
    4. virtual void doSomething() = 0;
    5. };
    To copy to clipboard, switch view to plain text mode 
    The plugin API would then simply need something like
    Qt Code:
    1. class Plugin
    2. {
    3. public:
    4. virtual void setHost(HostApi *host) = 0;
    5. };
    To copy to clipboard, switch view to plain text mode 
    The host application can implement the API in any object it likes, it could even hand each plugin a different instance of the implementation or even different implementations.

    Cheers,
    _

  3. The following user says thank you to anda_skoa for this useful post:

    itpenguin (28th July 2016)

  4. #3
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    Default Re: plugin accessing data from qApp

    OK, my mistake was the declaration of doSomething(). It must be virtual, because the address of the method is allocated dynamically at run time.

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