I think you should use {$PACKRECORDS C}

High all,

for the QT engine I have defined a variant struct that can hold any type of data yet be easy to deal with on both sides. I call it a lvariant which is a defined C struct. I was just using a void pointer in the QT engine to pass any data to the engine and back but I wish to define a type of variant structure to pass back and forth to make stuff like rect where I need four integers a little easier to deal with on both ends.

if I where to want to pass a pointer to a c struct in pascal is this the correct way to do it.? Do I need to pack the records for this call.

  pinteger = ^integer;
  lVariant = ^TLVariant
  {$PACKRECORDS 4}
  TLVariant = record
                    datatype: pinteger;
                    lstring: pchar;
                    lbuffer: pointer;
                   end;
  struct lazvaraint{
                          int *datatype;
                          char *lstring;
                          void * lbuffer;
                          }

-----------------now the call to the c function

   var
   pstruct : lVariant;
  mycstructrequiringfunction(pstruct);

Cliff

yep thanx Florian I already got it.

Cliff