Starting a thread which runs a member function

[daniel]

Hello ,

I have the following code :

//...additional includes cut off
class MyThread{

public:
DWORD WINAPI ThreadProc( LPVOID lpParameter );
void run();
};

DWORD WINAPI MyThread::Threa dProc(LPVOID lpParameter){

cout<<"Thread called\n";
return 0;
}

void MyThread::run() {

CreateThread(NU LL, 0, MyThread::Threa dProc, NULL, 0, NULL); //<---
LINE
}

void main(void){


MyThread p;
p.run();

}

When i compile this ( with MSVS 2005 ) i get the following compile
error:

LINE: error C3867: 'MyThread::Thre adProc': function call missing
argument list; use '&MyThread::Thr eadProc' to create a pointer to
member.

Then I add &MyThread:Threa dProc instead of MyThread::Threa dProc and i
get another compile error:

LINE: error C2664: 'CreateThread' : cannot convert parameter 3 from
'DWORD (__stdcall MyThread::* )(LPVOID)' to 'LPTHREAD_START _ROUTINE'

Any logic explanation?

Thank-you ,

Daniel

[AnonMail2005@gmail.com]

Re: Starting a thread which runs a member function

On Aug 15, 10:56 am, daniel <daniel.bal...@ gmail.comwrote:

Hello ,
>
I have the following code :
>
//...additional includes cut off
class MyThread{
>
public:
        DWORD WINAPI ThreadProc(  LPVOID lpParameter );
        void run();
>
};
>
DWORD WINAPI MyThread::Threa dProc(LPVOID lpParameter){
>
        cout<<"Thread called\n";
        return 0;
>
}
>
void MyThread::run() {
>
        CreateThread(NU LL, 0, MyThread::Threa dProc, NULL, 0, NULL); //<---
LINE
>
}
>
void main(void){
>
        MyThread p;
        p.run();
>
}
>
When i compile this ( with MSVS 2005 ) i get the following compile
error:
>
LINE: error C3867: 'MyThread::Thre adProc': function call missing
argument list; use '&MyThread::Thr eadProc' to create a pointer to
member.
>
Then I add &MyThread:Threa dProc instead of MyThread::Threa dProc and i
get another compile error:
>
LINE: error C2664: 'CreateThread' : cannot convert parameter 3 from
'DWORD (__stdcall MyThread::* )(LPVOID)' to 'LPTHREAD_START _ROUTINE'
>
Any logic explanation?
>
Thank-you ,
>
Daniel

It expects a free standing function not a member function. The bad
news is that you will have to provide that function. The good news is
that you can pass anything you want to that function so it's pretty
easy to pass an address of some object that you can use.

HTH

[Paavo Helde]

Re: Starting a thread which runs a member function

daniel <daniel.baluta@ gmail.comkirjut as:

Hello ,
>
I have the following code :
>
//...additional includes cut off
class MyThread{
>
public:
DWORD WINAPI ThreadProc( LPVOID lpParameter );
void run();
};
>
DWORD WINAPI MyThread::Threa dProc(LPVOID lpParameter){
>
cout<<"Thread called\n";
return 0;
}
>
void MyThread::run() {
>
CreateThread(NU LL, 0, MyThread::Threa dProc, NULL, 0, NULL); //<---
LINE
}
>
void main(void){
>
>
MyThread p;
p.run();
>
}
>
When i compile this ( with MSVS 2005 ) i get the following compile
error:
>
LINE: error C3867: 'MyThread::Thre adProc': function call missing
argument list; use '&MyThread::Thr eadProc' to create a pointer to
member.
>
Then I add &MyThread:Threa dProc instead of MyThread::Threa dProc and i
get another compile error:
>
LINE: error C2664: 'CreateThread' : cannot convert parameter 3 from
'DWORD (__stdcall MyThread::* )(LPVOID)' to 'LPTHREAD_START _ROUTINE'

See FAQ:

http://parashift.com/c++-faq-lite/pointers-to-members.html#faq-33.2

And consider to use boost::thread instead.

hth
Paavo