🚀 go-pugleaf

Cheers Brent. :-)

"Brent" <nospam@nospam.com> wrote in message
news:41b7d761@newsgroups.borland.com...
> Great that you worked it out.  Here's a link to an article that discusses
> callback functions with C++, API and VCL events.
>
>
http://bcbjournal.org/articles/vol4/0007/Understanding_function_pointers.htm
>
>
> "Angus" <aguspickton@yahoo.com> wrote in message
> news:41b7d5c0@newsgroups.borland.com...
> > No matter how many times i read about callback functions, i could never
> > really grasp them. It often depends on the information is presented.
With
> > respect to callbacks, a little light flickered on, and here is an
> > explanation for anyone dense as hardwood like myself. - and if you don't
> > like it, oh well.
> >
> > Callback - the passing of your own function as a parameter into another
> > function. Consider the call.
> >
> > void __fastcall TForm1::Button1Click(TObject *Sender){
> >     std::auto_ptr<TComboBox>CB(new TComboBox(this));
> >     SomeFunction( MyFunc, CB);
> > }
> >
> > Now SomeFunction may be something you have written to retrieve a list of
> all
> > say all process names.. ie.
> >
> > BOOL WINAPI SomeFunction(PROCENUMPROC myfunc, LPARAM lParam){
> >    // ...some code..e.g getting a the next process in a snapshot list.
> now
> > call your own function MyFunc.e.g.
> >
> >   while(MyFunc(processname, lParam) && ProcessesRemain){
> >          //pass in a var from this func, AND a var from your calling vcl
> > program
> >         if(dada)
> >            ProcessesRemain = false;
> >   }
> > }
> >
> > ...and MyFunc...
> > BOOL CALLBACK MyFunc(char*  processname, LPARAM lParam){
> >    TComboBox* cb = (TComboBox*)lParam; //do a cast
> >     cb->Items->Add(AnsiString(processname));
> >     return true;
> > }
> >
> > In essence then, MyFunc is passed into SomeAPICallbackFunction. In this
> > example, each process is iterated using snapshot.
> > With each process found, a call to MyFunc is made, passing in the name
of
> > the process.. and in this instance a link to your calling program, a
combo
> > box.
> >
> > rgds Angus.
> >
> >
>
>