Load objects from dynamic library

Hi, I want load objects with dynamic library without result ;/
I add in *.pro file:

Code:

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LIBS += -Lpath -lname

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and in *.cpp or *.h

Code:

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extern "C" class __declspec(dllimport) testclass{};

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It doesn't work. Why? Does it good prepare?

I'm not sure about the 'extern "C"'. And I'd use macros as explained here.

Anyway, what does not work? Do you get a linker error or a runtime error?

My program not complie ;/ I haven't any reports from debugger.
How can I use Q_DECL_IMPORT in my file who import library?
Btw:

Code:

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LIBS += -LC:\Documents and Settings\bla\Pulpit\Qt Progs\LoaderObj\debug -lLoaderObj

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is it correctly? It isn't building me now.

do you write this library by yourself? if yes read this and modify it.
maybe QLibrary also can help you.

Hi, I use QLibrary, and have some problem with action.
It's my code:
1.In *.dll

Code:

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void LOADEROBJSHARED_EXPORT kamil()
{}

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2. In app

Code:

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typedef void (*AvgFunction)();
    QMessageBox kamil;
    QLibrary library("LoaderObj.dll");
    library.load();
    AvgFunction avg = (AvgFunction) library.resolve("kamil");
     if (avg)
        kamil.setText("good");
     else
        kamil.setText("bad");
 
       kamil.exec();

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Why it don't laod my function while load library? ;/

I am having similar problems. I am new to libs and Qt. Anyone plz solve this problem.

Quote:

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Originally Posted by Trok

Why it don't laod my function while load library? ;/

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You have to load first the library and then methods.

For load classes from dynamic library see this link
http://www.prog.org.ru/topic_8259_0.html

PS: Russian language :)

Quote:

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Originally Posted by kuzulis

PS: Russian language :)

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Impossible for most of us. :)
But QLibrary::resolve() can resolve all exported symbols. Just remember you have to add this prefix @ the time of exporting symbols from dll.
__declspec(dllexport) ///FOR WINDOWS ONLY

Quote:

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Impossible for most of us.

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Use http://translate.google and you will be a great happiness :)

Quote:

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Originally Posted by sumitgogna

I am having similar problems. I am new to libs and Qt. Anyone plz solve this problem.

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Could you explain the problem? What errors do you get?