Question

I have a Delphi 5 application in the application code calls a function in the DLL, passing integer and string parameters, this works well when the DLL is called in a static way, when I try to dynamically change does not work.
which is the correct way to pass parameters to function dynamically?
the code is as follows

main application

  function Modulo_Pptos_Operacion(No_Orden : Integer; pathBD : string; PathBDConf :   String) : Integer ; stdcall;
 external 'LIB_Pptos_Oper.dll';

  Modulo_Pptos_Operacion(DmDatos.OrdenesNO_Orden.AsInteger,
   DmDatos.CiasPATHA.AsString, 'Alguna String');

DLL

  Modulo_Pptos_Operacion function (No_Orden: Integer; PathDB: AnsiString; PathDBConfig: AnsiString): Integer; StdCall;

DYNAMIC CRASH
main application

  type
    TDLLPpto = function(No_Orden : Integer; PathDB : AnsiString; PathDBConfig : AnsiString) : Integer;
  var
    DLLHandle: THandle;
    : TDLLPpto;

  PROCEDURE CALL
    DLLHandle := LoadLibrary('LIB_Pptos_Oper.dll');
    DLLHandle <> 0 then
   begin
     @DLLPpto := GetProcAddress(DLLHandle, 'Modulo_Pptos_Operacion');
   end;
  ;

which is the right way?

Answer 1

In the case of dynamically loaded dll you omitted stdcall; calling convention directive in the declaration of TDLLPpto. Still it is advisable to use PAnsiChar type to pass strings across executable boundaries.