[Interest] Is it possible to override dll in runtime in Qt?

[Vincent Cai]

Hi manish,

               Thanks for the reply.
               I am totally new to QPlugin and QLibrary.
               I don't quite understand your meaning.
               With your method below, can I load A/Prmt.dll then unload A/Prmt.dll and then load B/Prmt.dll in runtime without restarting Application?
               BTW, Core.dll is dependent on Prmt.dll, how can Core.dll know access symbols in Prmt.dll after changing Prmt.dll?

Regards,
Vincent.
From: manish sharma [mailto:83.manish at gmail.com]
Sent: Wednesday, April 09, 2014 2:42 PM
To: Vincent Cai
Cc: interest at qt-project.org
Subject: Re: [Interest] Is it possible to override dll in runtime in Qt?

i think it should work using pluginloader something like below:

QObject* getPrmt(QString path)
{
        QDir pluginsDir(path)
        QPluginLoader loader(pluginsDir.absoluteFilePath(fileName));
        return loader.instance();
}
and call getPrmt function with any of "A/Prmt.dll", "B/Prmt.dll"?

On Wed, Apr 9, 2014 at 10:34 AM, Vincent Cai <wcai at cypress.com<mailto:wcai at cypress.com>> wrote:
Dear All,

I have an Qt application, which uses 2 dll, one is Prmt.dll and the other is Core.dll. Core.dll is dependent on Prmt.dll. Prmt.dll has multiple instances in different folders, for example: A/Prmt.dll, B/Prmt.dll... The Qt application provides an option to choose Prmt.dll, so it need to override Prmt.dll in runtime. Is it possible to override dll in runtime in Qt?

Regards,
Vincent.
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