Can't Create a Thread in a Class?

[WriteGreatCode]

Hello everyone, I have a class and inside it I have this function:

DWORD CALLBACK Function (void *)
	{
		return 0;
	}

Now when I try to create a thread with the CreateThread() function it says:

error: argument of type 'DWORD (nsCBPGUI::Testing::)(void*)' does not match 'DWORD (*)(void*)'|

How would I go about using a thread in a class? When ever I've tried to do this out side a class it has worked great.


Thanks.

[firedraco]

You can't pass a class member function to CreateThread because a class member function needs to be called with a class pointer (so it can use this). You can either make the function static or a global function.

[Fisch]

Yes, you need to create a thread with a function of the type LPTHREAD_START_ROUTINE as startaddress.
Then you can call the method of the object given as argument.

#include <Windows.h>
#include <iostream>

using namespace std;

class YOUR_CLASS
{
public:
      YOUR_CLASS( void );
      DWORD func( void );
};

DWORD __stdcall startMethodInThread( LPVOID arg )
{
       if(!arg)
            return 0;
       YOUR_CLASS *yc_ptr = (YOUR_CLASS*)arg;
       yc_ptr->func();
       return 1;
}

YOUR_CLASS::YOUR_CLASS( void )
{
      CreateThread(NULL, 4096, startMethodInThread, this, 0, NULL);
}

DWORD YOUR_CLASS::func( void )
{
      cout << "This is a new thread"  << endl;
}