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pgarrigue

DllCall function crash

4 posts in this topic

Hi everybody,

I've written a fonction in a dll and I've got a problem when executing the AutoIt script (crash of AutoIt interpreter).

Here the code of my DLL :

function.h

==========

#ifndef _EVAL_CHECKSUM_FULLWINDOW_H

#define _EVAL_CHECKSUM_FULLWINDOW_H

#ifdef BUILD_DLL

/* DLL export */

#define DLL_EXPORT __declspec(dllexport)

#else

/* EXE import */

#define DLL_EXPORT __declspec(dllimport)

#endif

#include <direct.h>

#include <iostream>

using namespace std;

extern "C" {

DLL_EXPORT short multby2(short input, short *output);

};

#endif

function.cxx

extern "C" {

BOOL WINAPI DllMain(HANDLE hinst, DWORD reason, LPVOID lpReserve)

{

//HInst = (HINSTANCE)hinst;

//printf ("Handle de la DLL de DllMain : %d\n", (unsigned int)HInst);

switch(reason)

{

case DLL_PROCESS_ATTACH:

printf ("Attachement de la DLL au process \n");

break;

case DLL_PROCESS_DETACH:

printf ("Déttachement de la DLL du process \n");

break;

default :

// DLL_THREAD_ATTACH, DLL_THREAD_DETACH

break;

}

return true;

}

}

short multby2(short input, short* output)

{

cout << "input = " << input << endl;

*output = 2*intput;

return 0;

}

dll compilation

===============

g++ -c -DBUILD_DLL function.cxx

g++ -shared -o mydll.dll function.o -mwindows

Here the autoit script :

=========================

$dll = DllOpen("mydll.dll")

$input = 3;

$str = "short;"

$struct = DllStructCreate($str)

$result = DllCall($dll, "short", "multby2", "short", $input,"ptr",DllStructGetPtr($struct))

What I observed :

================

The script calls the DLL : OK but it seems to have a problem during the return to the autoit script.

Any idea ?

Thanks

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There is (at least) a calling convention error:

$result = DllCall($dll, "short:cdecl", "multby2", "short", $input,"ptr",DllStructGetPtr($struct))


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Change calling method to cdecl.


♡♡♡

.

eMyvnE

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Thanks a lot jchd and trancexx

It's fine now.

I will find on the net what is the meaning of cdecl.

Have a nice day.

Philippe

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