Create a function thats like printf?

[Ajm113]

I want to create a function that works like printf with the two params like so:

1. const char*

2. _Format

So I can use %s and so forth into the first param just like printf to enter variables to be placed in the message.

How may I accomplish this?

[oler1s]

printf is what is known as a variadic function.

[gpraghuram]

Search in the net for Variable argument list.
You shuld use va_arg,va_start etc...
Start writing the code and if u face issues post again here.

Raghu

[Ajm113]

K I am trying to send this information into a string so I can send it to my edit control, but it seems the program crashes at this line:

  len = _vscprintf( message, args ) // _vscprintf doesn't count
                               + 1; // terminating '\0'

The debugger isn't much help and I can't find much crash topics on the function...

void PrintLine(const char * message, HWND control, ...)
{
stringstream ss;

va_list args;
   int len;
   char * buffer;

   va_start( args, message );
   len = _vscprintf( message, args ) // _vscprintf doesn't count
                               + 1; // terminating '\0'
   buffer = (char*) malloc( len * sizeof(char) );
   vsprintf( buffer, message, args );

   ss <<  buffer;
   free( buffer );

SendMessage(control, EM_REPLACESEL ,0,(LPARAM)ss.str().c_str());  

}

[dtimes6]

Please take a look at header file cstdarg (stdarg.h)