_beginthread on a class method

[Altman]

I have a class called cScale, I have made an array of scale objects and I
need to run a method of these objects as a new thread. This is my line of
code and I can't get it to run. I am still a little of a newbie to C++.
Scales is an array of scale objects and weighup is my method.

Scales[ScaleNum].thread = _beginthread( Scales[ScaleNum].WeighUp, 0, NULL);

[Steve Alpert]

Altman wrote:

I have a class called cScale, I have made an array of scale objects and I
need to run a method of these objects as a new thread. This is my line of
code and I can't get it to run. I am still a little of a newbie to C++.
Scales is an array of scale objects and weighup is my method.

Scales[ScaleNum].thread = _beginthread( Scales[ScaleNum].WeighUp, 0, NULL);

You can't do it that way. The thread startup calls normally take a
void* pointer. I suggest you pass in a pointer to a structure
containing a "this" pointer to an instance of the class together some
data so it knows what function to actually execute.

/steveA

--
Steve Alpert
my email Fgrir_Nycreg @ vqk.pbz is encrypted with ROT13 (www.rot13.org)
and spaces

[Hendrik Schober]

Steve Alpert <sr*@newsgroups .nospam> wrote:

Altman wrote:

I have a class called cScale, I have made an array of scale objects and I
need to run a method of these objects as a new thread. This is my line of
code and I can't get it to run. I am still a little of a newbie to C++.
Scales is an array of scale objects and weighup is my method.

Scales[ScaleNum].thread = _beginthread( Scales[ScaleNum].WeighUp, 0, NULL);

You can't do it that way. The thread startup calls normally take a
void* pointer. I suggest you pass in a pointer to a structure
containing a "this" pointer to an instance of the class together some
data so it knows what function to actually execute.

Actually, passing the 'this' pointer
itself should do. Something like this:

class my_thread {
public:
// ...
protected:
void thread_func();
private:
static void thread_func_(vo id* p)
{
my_thread* this_ = reinterpret_cas t<my_thread*>(p );
this_->thread_func( );
}
};

void start_thread(my _thread* thr)
{
_beginthread( &my_thread::thr ead_func_, 0, thr );
}
/steveA

Schobi

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