New subject: CParamCount and CParameters (was: Memory layout of array of variable size.)

30 Jul 2006


      Hi,
In an attempt to hook up to GTK+, I am trying to pass a Pascal array of 
varible size to C. Static arrays are fine, but these arrays carry some 
additional information like capacity and size, and I gues they could be 
received as a struct on the C-side. However, I cannot figure out the 
structure that the struc should have.
I do like this in Pascal:
procedure YGTK_init(var argc : CInteger;
                        argv : array of CString); external name 'YGTK_init';
procedure Y_init;
var
   argc    : CInteger;
   argv    : array[0..ParamCount] of CString;
   Counter : integer;
begin
   argc := ParamCount+1;
   for Counter := 0 to ParamCount do
   begin
      argv[Counter] := NewCString(ParamStr(Counter));
   end;
   YGTK_init(argc, argv);
end;
And like this in C:
struct t_argv {
  int end;
  void *argv;
};
void YGTK_init( int *argc, struct t_argv argv )
{
  printf("In ygtk.c:YGTK_init.\n");
  printf("argv.end: %d\n", argv2.argc);
  printf("argv.argv address: %p\n", argv2.argv);
  printf("argv.argv int: %d\n", argv2.argv);
  printf("argv.argv string: %s\n", argv2.argv);
  printf("number of arguments: %d\n", *argc);
}
So I figured out that the first element in the struct is an integer 
containing the length-1 of the array, but what it should look like for 
the rest I do not know yet. Do you have an idea?
Thanks,
Bastiaan.