Hi all,
I am trying to write a simple DLL that calls back to the VB app that
called it in the first place.
Below is the code in the DLL
// start of code
FARPROC addr1 = NULL;
FARPROC addr2 = NULL;

extern "C" long _stdcall EXPORT Store (FARPROC a1, FARPROC a2)
{
addr1=a1;
addr2=a2;
return 0;
}

extern "C" long _stdcall EXPORT Execute (FARPROC addr)
{

long result;

if (addr1 == NULL)
return -1;
result = addr1();
result = addr2();
return result;
}

extern "C" long _stdcall EXPORT Execute2 (FARPROC addr , long value)
{
long result;
result = addr( value);
return result;
}
// end of code.

Now Store and Execute run OK.
Execute2 won't compile. I get the following error message:

"...Pointers.cpp(93) : error C2197: 'int (__stdcall *)(void)' : too many
actual parameters"
with the line 'result = addr(value);' producing the error.
What am I not doing correctly?

TIA
Geoff Turner.

> extern "C" long _stdcall EXPORT Execute2 (FARPROC addr , long value)[color=blue]
> {
> long result;
> result = addr( value);
> return result;
> }
> // end of code.
>
> Now Store and Execute run OK.
> Execute2 won't compile. I get the following error message:
>
> "...Pointers.cpp(93) : error C2197: 'int (__stdcall *)(void)' : too many
> actual parameters"
> with the line 'result = addr(value);' producing the error.
> What am I not doing correctly?[/color]


FARPROC is defined as...

typedef int (FAR WINAPI *FARPROC)();

....thus takes no parameters! Use something likes...

typedef long (WINAPI* FURTHERPROC)(long Value);

extern "C" long _stdcall EXPORT Execute2 (FURTHERPROC addr , long value)


Regards,
MRe

"MRe" <removethis_mre@dublin.ie> wrote in message
news:dwt7c.1832$qP2.6389@news.indigo.ie...[color=blue][color=green]
> > extern "C" long _stdcall EXPORT Execute2 (FARPROC addr , long value)
> > {
> > long result;
> > result = addr( value);
> > return result;
> > }
> > // end of code.
> >
> > Now Store and Execute run OK.
> > Execute2 won't compile. I get the following error message:
> >
> > "...Pointers.cpp(93) : error C2197: 'int (__stdcall *)(void)' : too many
> > actual parameters"
> > with the line 'result = addr(value);' producing the error.
> > What am I not doing correctly?[/color]
>
>
> FARPROC is defined as...
>
> typedef int (FAR WINAPI *FARPROC)();
>
> ...thus takes no parameters! Use something likes...
>
> typedef long (WINAPI* FURTHERPROC)(long Value);
>
> extern "C" long _stdcall EXPORT Execute2 (FURTHERPROC addr , long value)
>
>
> Regards,
> MRe
>
>[/color]

Thank you very much, that's just want I want.

Regards,
Geoff.