"Bit Byte" <flip@flop.com> wrote in message
news:Gr-dnevWqtIuYFTZnZ2dnUVZ8sydnZ2d@bt.com...
> Is it possible to pass variable length parameters to a C function exported
> in a DLL (i.e. using varargs.h without resorting to say passing a
> delimited string to be parsed in the function)?
>
> i.e. I want something like this:
>
> #include <varargs.h>
>
> CCONV foo( char* fmt, va_list args ) ;
>
> where CCONV is the calling convention (import/export)

"Bit Byte" <flip@flop.com> wrote in message
news:9u6dnbbBvbDC3FfZRVnysg@bt.com...
> Ah, but I did leave out one piece of (vital?) information though - I want
> to be able to call this Dll function from VB - still possible ?

William DePalo [MVP VC++] wrote:

> "Bit Byte" <flip@flop.com> wrote in message
> news:Gr-dnevWqtIuYFTZnZ2dnUVZ8sydnZ2d@bt.com...
>
>>Is it possible to pass variable length parameters to a C function exported
>>in a DLL (i.e. using varargs.h without resorting to say passing a
>>delimited string to be parsed in the function)?
>>
>>i.e. I want something like this:
>>
>>#include <varargs.h>
>>
>>CCONV foo( char* fmt, va_list args ) ;
>>
>>where CCONV is the calling convention (import/export)
>
>
> Yes. In fact wsprintf(), which takes a variable number of arguments, is
> exported by USER32.DLL. What problem are you having?
>
> Regards,
> Will
>
>

> Thanks for replying, actually, my prototype was wrong. I wanted something
> more like this:
>
> CCONV foo(char* fmt, ...) ;
>
> To be exported by my DLL - is this possible ?
>
> (from what you say though - it should be possible - since wsprintf is
> exported by user32.dll. I have seen a lot of questions posted about this
> and the answer seems to be a resounding no - or having to resort to
> "tricks".
>
> Ah, but I did leave out one piece of (vital?) information though - I want
> to be able to call this Dll function from VB - still possible ?

>