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Staticloadvsdynamic load

is there any C++/Qt function equivalent to load that can load the shared library on demand from another C++ function. My requirement is to load the shared library inside a function and then use the QT library , Is there any way I load the QT Library after call of certain function

Loaddynamics

and you want to call myMethod(int) of a newly created object of that class. But also suppose that class is compiled into a dynamic library myclasslib.so for all intents and purposes of this discussion. Suppose that the fully decorated symbols' names for the methods of this class are as follows:

Dynamic loadformula

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1 ) Do not need to link the QT library in my final Executable 2) also Can u write a sample application how will multiple calls to many Qt functions codes can be called after

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Normally one can use plugins and interfaces and it removes the resolve part but you are using plain shared lib, so not not sure what u need or dont nee

Oh, and by the way, this gets even more complicated when the objects have virtual tables (which QObject derived classes do).

Dynamic loadexamples

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Okay, @mrjj encouraged me to give you the full reasoning why those shenanigans are bad. Hence, I'm going to do so. Suppose you have a class MyClass with declaration in "myclass.h":

What is a staticload

What isdynamicloading in structures

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So this is how you can create an object, call it's constructor, call the method and finally call the destructor and free the allocated memory (code is not tested, but should be working in principle):

Staticloadvsdynamic loadbearing

No, and you won't be able to accomplish that with QLibrary, it's a bit more involved than resolving a simple C-linkage function.

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typedef void (*MyInitPtr)(Tcl_Interp *); MyInitPtr My_Init = reinterpret_cast( QLibrary("/path/to/libmy.so").resolve("My_Init") ); if (My_Init) My_Init(&my_tcl_struct);

Difference between staticloadanddynamic loadPDF

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@Qt-Enthusiast Hi I think yes. for your setup. Normally one can use plugins and interfaces and it removes the resolve part but you are using plain shared lib, so not not sure what u need or dont need :)

@hskoglund That's why I usually typedef the type locally, looks simpler (and since I despise auto I'm a happy man not using it):

void loadSharedObject() { //load the // Call the function names directly // no extra code for resolving the function /symbols names // for example fun1() fun2() }

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this just resolves all symbols at load time, as said in the docs. But still you need a pointer to the function you want to call.

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if I multiple calls of QT functions then do I need to resolve each an every call for exxample I have 1 lac calls to Qt functions then do I need to resolve each an every function

to add to @raven-worx , you can see example here https://wiki.qt.io/How_to_create_a_library_with_Qt_and_use_it_in_an_application in Using QLibrary to load the shared library Note the CreateWidgetFunction cwf = (CreateWidgetFunction)library.resolve to actually call a function.