You are not logged in.

Library (DLL) issue

commx

Beginner

  • "commx" started this thread

Posts: 2

  • Send private message

1

Monday, August 4th 2008, 3:44pm

Library (DLL) issue

Hello!
My program is loading shared libraries (*.dll, *.so, etc) - that works fine - but I do need signal&slots and therefor I have to put Q_OBJECT into my class in the library. The linker does not like that, as the class is declared inside a extern "C" and Q_OBJECT uses template, pure C++ code.

Source code

 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

#include <QObject>
#include <QStringList>

extern "C" {
  class ModControl : public QObject {
	Q_OBJECT
	private:
  	bool isCreated;

	public:
  	ModControl();
  	~ModControl();

	public slots:
  	void send(const QStringList &strlArgs);
  };
}


When I'm removing Q_OBJECT, anything compiles and is linked properly.
What can I do?

Nicolas SOUCHON

Master

Posts: 1,867

  • Send private message

2

Monday, August 4th 2008, 4:14pm

I don't understand why do declare class in extern "C" bloc
Nicolas

commx

Beginner

  • "commx" started this thread

Posts: 2

  • Send private message

3

Monday, August 4th 2008, 4:23pm

Because if I would not, there will be a symbol resolving error - On module loading it says "undefined reference _ZY10ModControl" - putting the class into a extern "C" solves that problem.

Nicolas SOUCHON

Master

Posts: 1,867

  • Send private message

4

Monday, August 4th 2008, 8:07pm

what is the library against which you link?
Nicolas