Constructor Initialization Fails

Tharma

Hi, I am new to Qt/QtCreator world - I have been traditionally on Visual Studio. But seeing the kind of dynamism in the world, I was so excited learning what is what. Finally, I thought of doing a simple porting stuff from VS to Qt way. I failed and spent many days without any productivity. But what I am doing is damn simple.

Here is what I used to do in VS2017 -

class MyApiClient 
{
private:
    CManagerFactory   m_factory;
    CManagerInterface *m_manager;
public:
	MyApiClient() : m_factory("mymanapi64.dll"), m_manager(NULL)
	{
	   // constructor code
	}

When I tried it on Qt it did not work... and try many different ways like -

I tried this
I played around with QLibrary. Though my DLL gets loaded successfully using QLibrary Library(xxxx.dll).

    QLibrary library("C:/xx/MyWorkspace/Qt/mymanapi64.dll");
    if (!library.load()) {
      qDebug() << library.errorString();
    }
    else {
      qDebug() << "It loaded successfully";     // <- I get this message!!
	 }

BUT.... i do not know how to get the class member (m_factory) initialized using QLibrary in the similar way that I could do it in VS .

Note This is a 3rd party .dll and along with that i have only a header and no libraries. I need to get the CManagerFactory instance, and start working on that. But I am stuck at this... you would not believe me, I wasted 20+ hours only this :(

For Qt experts, maybe this could be a cake-walk. I would really appreciate if someone could throw lights on this.

Thanks,
Tharma

aha_1980

@Tharma

you need to use resolve and cast the result to your functions signature.

That is pure C/C++ basic and nothing special to Qt. QLibrary uses Windows API LoadLibrary behind the scenes (and similar calls on other OS) but provides you a convenient API.

Regards