[resolved]dll call on a custom dll

[Xand3r]

i made a simple dll in visual c++ 2008 and tried to call the functions in autoit and ran into a problem

if i call a func with no parameters(void) it works just fine but when i pass any kind of parameters i get an error from windows saying that autoit has stopped working

os:windows vista x64 sp2

autoit:3.3.0.0

$dll = DllOpen(@ScriptDir & "\mumu.dll")
$a = 123
$s = DllCall($dll, "int", "test1")
MsgBox(0, @error, $s[0])
$s = DllCall($dll, "int", "test2","int" , 0)
MsgBox(0, @error, $s[0])

#include <stdio.h>
#define _export __declspec(dllexport)

extern "C"
{
  __declspec(dllexport) int test1(){
        return 100;
  }
  __declspec(dllexport) int test2(int z){
      return z;
  }
}

mumu.dll

Edited April 9, 2009 by TheMadman

[ProgAndy]

you declare your functions as extern "C". So you have to use cdel in AutoIt, i think:

$s = DllCall($dll, "int:cdecl", "test2","int" , 0)

[trancexx]

Not only that, but you need to do it like this:

#include <WinAPI.au3>
#include <Constants.au3>

;$dll = DllOpen(@ScriptDir & "\mumu.dll")

_WinAPI_LoadLibraryEx(@ScriptDir & "\mumu.dll", $DONT_RESOLVE_DLL_REFERENCES)

$a = 123
$s = DllCall(@ScriptDir & "\mumu.dll", "int:cdecl", "test1")
ConsoleWrite(@error & @CRLF)

MsgBox(0, @error, $s[0])

$s = DllCall(@ScriptDir & "\mumu.dll", "int:cdecl", "test2","int" , 5)
MsgBox(0, @error, $s[0])

Entry point is messed up. That's not good.

edit:

This example indicates that AutoIt will, if you pass string to DllCall() function, first call GetModuleHandle function and then LoadLibrary to load module.

Edited April 9, 2009 by trancexx

[Authenticity]

I think he needs also to make a .def file and specify it in the input command line of the environment compiler (Visual C++ right?) because otherwise the function's name is strange because of name decoration.

[Xand3r]

Not only that, but you need to do it like this:

#include <WinAPI.au3>
#include <Constants.au3>

;$dll = DllOpen(@ScriptDir & "\mumu.dll")

_WinAPI_LoadLibraryEx(@ScriptDir & "\mumu.dll", $DONT_RESOLVE_DLL_REFERENCES)

$a = 123
$s = DllCall(@ScriptDir & "\mumu.dll", "int:cdecl", "test1")
ConsoleWrite(@error & @CRLF)

MsgBox(0, @error, $s[0])

$s = DllCall(@ScriptDir & "\mumu.dll", "int:cdecl", "test2","int" , 5)
MsgBox(0, @error, $s[0])

Entry point is messed up. That's not good.

tnx alot guys

[trancexx]

You are marking this as [resolved], but DONT_RESOLVE shouldn't be considered as a real resolver.

Resolving this requires of you to resolve it on a different level. There could be more people with similar unresolved problems and they could try to resolve it like it's resolved here and that would likely create new unresolved... things.

I could use "resolve" couple of times more in this post but I won't.