• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 311
  • Last Modified:

Calling proc (no params or ret val) why is call skipped?

I defined a REALLY SIMPLE dll in Delphi 4 which houses 1 function that doesn't take paramters and doesn't return anything.  When I call it from VC++, the loadLibrary call works, and the getProcAddr also works (seems to return a non null value...), but VC++ seems to SKIP MY CALL to the actual dll procedure.  Perhaps I have the syntax of the call wrong?

---------------------- VC++ test code
// testdll1.cpp : Defines the entry point for the application.
//

#include "stdafx.h"

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
       // TODO: Place code here.

    HINSTANCE hDLL;
    FARPROC ProcAdd;

    hDLL = LoadLibrary("a1.dll");
    ProcAdd = GetProcAddress(hDLL,"ANDY0");
    if (ProcAdd == NULL) return 0;

    ProcAdd;    // THIS IS SKIPPED????

    return 0;
}
------------------------
0
abulka
Asked:
abulka
  • 2
1 Solution
 
jhanceCommented:
Try it like this instead:

typedef void (WINAPI * PFANDYO)(void);

{
  PFANDYO pfANDYO;
  HINSTANCE hDLL;

  hDLL = LoadLibrary("a1.dll");

  pfANDYO = (PFANDYO)GetProcAddress(hDLL, "ANDYO");

  pfANDYO();

  return 0;
}
0
 
nietodCommented:
The key difference there is the "()" after the function pointer.  That is the "fucntion call operator", telling the compiler to call the function.
0
 
jhanceCommented:
>The key difference there is the "()"
>after the function pointer.  

Yes, I mean to to say that...

I also find it's helpful to declare the call properly.  This is especially useful when calling DLL functions with arguments.
0

Featured Post

Prep for the ITIL® Foundation Certification Exam

December’s Course of the Month is now available! Enroll to learn ITIL® Foundation best practices for delivering IT services effectively and efficiently.

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now