Thread: Calling DLL from C "too few arguments to call function"

  1. #1
    Registered User
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    Sep 2019
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    Calling DLL from C "too few arguments to call function"

    I have a dll written in C and a C program to call it. The C program gives a compile error "too few arguments to call function" but the function it's calling does not have any arguments.

    The dll (SxSv.dll):

    Code:
    #define EXPORT __declspec(dllexport)
    EXPORT int SSV ();
    
    __declspec(dllexport) int __stdcall SSXV()
    {
    int n = 0;
    
    while(n < 500000){
    n += 1;
    }
    
    return n;
    
    }
    The C program to call the dll (SxSv.c):

    Code:
    #include "SxSv.h"
    
    int loadDLL( )
    {
    int status = 0;
    TestFunc _TestFunc;
    HINSTANCE testLibrary = LoadLibrary("SxSv.dll");
    
    if (testLibrary)
    {
    _TestFunc = (TestFunc)GetProcAddress(testLibrary, "SSXV");
    if (_TestFunc)
    {
    status = _TestFunc(); // THIS IS THE LINE WITH THE ERROR
    }
    
    FreeLibrary(testLibrary);
    
    }
    return status;
    }

    The wrapper's header file (SxSv.h):

    Code:
    #ifndef DLLHANDLER_C_
    #define DLLHANDLER_C_
    
    #include <windows.h>
    #include <winbase.h>
    #include <windef.h>
    #include <stdio.h>
    
    typedef int (*TestFunc)(int);
    
    int loadDLL( void );
    
    #endif
    The exported function SSXV() takes no arguments, so why does the line status = _TestFunc(); report "too few arguments" when I compile the C program to call the dll?

    Thanks.

  2. #2
    and the hat of int overfl Salem's Avatar
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    > typedef int (*TestFunc)(int);
    This is what erroneously gives your function arguments.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  3. #3
    Registered User
    Join Date
    Sep 2019
    Posts
    12
    Thanks for the tip. I changed it to typedef int (*TestFunc)(void); and now it works.

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