Thread: Problem with linking a .dll file

  1. #1
    Registered User
    Join Date
    Apr 2003

    Problem with linking a .dll file

    Hi there .

    I've got a problem getting a program to work. I'm quite a newbie so please explain things a bit ok .

    I've got this program code:

    #include <windows.h>
    #include <stdio.h>
    #include <iostream.h>
    #include "winio.h"
    int main()
      DWORD dwPortVal;
      bool bResult;
      bResult = InitializeWinIo();
      if (bResult)
        GetPortVal(0x378, &dwPortVal, 4);
        cout << dwPortVal << endl;
        return 0;
    and winio.h looks like this:

    #ifndef WINIO_H
    #define WINIO_H
    #undef WINIO_DLL
    #ifdef WINIO_DLL
    #define WINIO_API _declspec(dllexport)
    #define WINIO_API _declspec(dllimport)
    extern "C"
      WINIO_API bool _stdcall InitializeWinIo();
      WINIO_API void _stdcall ShutdownWinIo();
      WINIO_API PBYTE _stdcall MapPhysToLin(PBYTE pbPhysAddr, DWORD dwPhysSize, HANDLE *pPhysicalMemoryHandle);
      WINIO_API bool _stdcall UnmapPhysicalMemory(HANDLE PhysicalMemoryHandle, PBYTE pbLinAddr);
      WINIO_API bool _stdcall GetPhysLong(PBYTE pbPhysAddr, PDWORD pdwPhysVal);
      WINIO_API bool _stdcall SetPhysLong(PBYTE pbPhysAddr, DWORD dwPhysVal);
      WINIO_API bool _stdcall GetPortVal(WORD wPortAddr, PDWORD pdwPortVal, BYTE bSize);
      WINIO_API bool _stdcall SetPortVal(WORD wPortAddr, DWORD dwPortVal, BYTE bSize);
      WINIO_API bool _stdcall InstallWinIoDriver(PSTR pszWinIoDriverPath, bool IsDemandLoaded = false);
      WINIO_API bool _stdcall RemoveWinIoDriver();
    extern bool IsNT;
    extern HANDLE hDriver;
    extern bool IsWinIoInitialized;
    bool _stdcall StartWinIoDriver();
    bool _stdcall StopWinIoDriver();
    I'm trying to get it to work, but it won't . I've compiled it with Borland free commandline tools by first compiling it to a .obj file and then linking it with a .lib file I created from a .dll file, using implib. The linker does produce an .exe file, but when running it, it says "program.exe is not a valid Win32 file" (or something similar; I'm actually using a Dutch version of Windows 2000).

    Can anyone please tell me what I'm doing wrong?

    BTW: the program is a program that reads the parallell port of the PC. Since this is not directly possible in Windows 2000, I use WinIo (from which bypasses the restrictions Windows has. Off course this is just an example program to see if WinIo works, but so far it hasn't.

    I have attached which contains the files I use.
    Last edited by Krankenstein; 04-28-2003 at 05:12 PM.

  2. #2
    Registered User
    Join Date
    Apr 2003

  3. #3
    Registered User
    Join Date
    Apr 2003
    Sorry, won't happen again

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