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From: Faraz on 6 Feb 2010 22:49

Dear Richard,

Now I have linked the exact path of the lib, like
"D:\Sensor3\MTCSApi.lib"

but get the following errors.

Linking...
sen3.obj : error LNK2001: unresolved external symbol
__imp__MTCSInitSystem
Debug/Sensor3.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

is there again problem with the paths
From: Richard Heathfield on 7 Feb 2010 04:08
Faraz wrote:
> Dear Richard,
>
> Now I have linked the exact path of the lib, like
> "D:\Sensor3\MTCSApi.lib"
>
> but get the following errors.
>
> Linking...
> sen3.obj : error LNK2001: unresolved external symbol
> __imp__MTCSInitSystem
> Debug/Sensor3.exe : fatal error LNK1120: 1 unresolved externals
> Error executing link.exe.
>
> is there again problem with the paths

No, you're now missing either a function definition or an object
definition. You need to identify the object file that defines the object
or function named in the error message, and link it to your project.

--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
"Usenet is a strange place" - dmr 29 July 1999
Sig line vacant - apply within
From: Faraz on 7 Feb 2010 22:37
Dear Richard,

I persistently got the same errors using implicit DLL linking even
when I changed the compiler settings so what I did was used explicit
function call. The following is the code and I am not using any lib or
header provided by the vendor.

int CallMyDLL(void)
{
int x;
/* get handle to dll */
HINSTANCE hGetProcIDDLL = LoadLibrary("D:\\Sensor8\\Debug\
\MTCSApi.dll");

if (hGetProcIDDLL){
cout<<"Success DLL";
/* get pointer to the function in the dll*/
FARPROC lpfnGetProcessID = GetProcAddress(HMODULE
(hGetProcIDDLL),"MTCSSetParameter");

if (lpfnGetProcessID){

cout<<"Success function";
/*
Define the Function in the DLL for reuse. This is just
prototyping the dll's function.
A mock of it. Use "stdcall" for maximum compatibility.
*/
typedef int (__stdcall * pICFUNC)(int, int, int);

pICFUNC MTCSSetParameter;
MTCSSetParameter = pICFUNC(lpfnGetProcessID);

/* The actual call to the function contained in the dll */
x = MTCSSetParameter(0, 10, 2);
}

}
/* Release the Dll */
FreeLibrary(hGetProcIDDLL);

/* The return val from the dll */
return x;
}

I am calling this function from main. I dont have any sort of errors,
but the point is that I am unable to get pointer to the function. I
have made a cout check on that by cout<<"Success function";. The DLL
gets loaded as I could enter Dll success. Do you think now there is a
problem with the DLL file since now its not able to access the
functions either.

Thanks

From: FrodoH on 8 Feb 2010 00:06
What is the exported symbol name of the function? You can use
"dumpbin.exe /exports <DLL_NAME>" or Dependency Walker to interrogate
the DLL.

This seems like a configuration issue with __stdcall or __cdecl.


On Feb 7, 9:37 pm, Faraz <faras...(a)gmail.com> wrote:
> Dear Richard,
>
> I persistently got the same errors using implicit DLL linking even
> when I changed the compiler settings so what I did was used explicit
> function call. The following is the code and I am not using any lib or
> header provided by the vendor.
>
> int CallMyDLL(void)
> {
>    int x;
>         /* get handle to dll */
>    HINSTANCE hGetProcIDDLL = LoadLibrary("D:\\Sensor8\\Debug\
> \MTCSApi.dll");
>
>    if (hGetProcIDDLL){
>         cout<<"Success DLL";
>    /* get pointer to the function in the dll*/
>    FARPROC lpfnGetProcessID = GetProcAddress(HMODULE
> (hGetProcIDDLL),"MTCSSetParameter");
>
>    if (lpfnGetProcessID){
>
>            cout<<"Success function";
>    /*
>       Define the Function in the DLL for reuse. This is just
> prototyping the dll's function.
>       A mock of it. Use "stdcall" for maximum compatibility.
>    */
>    typedef int (__stdcall * pICFUNC)(int, int, int);
>
>    pICFUNC MTCSSetParameter;
>    MTCSSetParameter = pICFUNC(lpfnGetProcessID);
>
>    /* The actual call to the function contained in the dll */
>    x = MTCSSetParameter(0, 10, 2);
>    }
>
>    }
>    /* Release the Dll */
>    FreeLibrary(hGetProcIDDLL);
>
>    /* The return val from the dll */
>     return x;
>
> }
>
> I am calling this function from main. I dont have any sort of errors,
> but the point is that I am unable to get pointer to the function. I
> have made a cout check on that by cout<<"Success function";. The DLL
> gets loaded as I could enter Dll success. Do you think now there is a
> problem with the DLL file since now its not able to access the
> functions either.
>
> Thanks

From: Ulrich Eckhardt on 8 Feb 2010 06:37
Remove ~120 of quoted text without any reference...

Faraz wrote:
> just for clarity i am also adding the header file
>
> #ifdef EXE
> #ifdef USB_DLL_EXPORTS
> #define USB_DLL_API __declspec(dllexport) __stdcall
> #else
> #define USB_DLL_API __declspec(dllimport) __stdcall
> #endif
> #endif

I guess (but only the vendor can answer that) that you are supposed to
#define EXE in your application's settings...

> #ifdef INDEX
> #include "MTCSApi_idx.h"
> #endif

....maybe define INDEX...

> #ifndef OBJECT
> #if defined(__cplusplus)
> extern "C" {
> #endif
> #endif

....and not define OBJECT when you are using C++, which I guess you do.

Check that your settings match the above.

Uli

--
Sator Laser GmbH
Geschäftsführer: Thorsten Föcking, Amtsgericht Hamburg HR B62 932

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