[C++] Dll + Visual basic ( URGENT )

[wolfulus]

hey guys, i want to call a function from a dll writed in c++

the c++ header of the function is:

int __stdcall MyFunc(unsigned char*Arg1,unsigned char*Arg2,int Arg3);

i added this to the top of visual basic code:

Public Declare Function MyFunc Lib "MyFunctions.dll" (ByVal Arg1 As Long, ByVal Arg2 As Long, ByVal Arg3 As Long) As Long

it still dont works

obs: arg1 and arg2 is pointers and i'm calling it as
return = MyFunc(VarPtr(bytearray(0), VarPtr(bytearray2(0)), mylongarg)
what i should do for this ** work?

[MentaL]

[FragFrog]

Erm, to make that work you must suply the function with pointers, ie memory-adresses. If there isn't a pointer in VB, try the referenced value. Or use google ofcourse to search for pointers in VB

[wolfulus]

VarPtr returns the pointer of some data man
Unofficial Documentation for VarPtr, StrPtr, and ObjPtr

[FragFrog]

Ah, silly me :icon6: Still, my knowladge of VB is minimal I'm affraid..

Whats the error though? That'll probably shed some light into this situation.. :)

[username1]

I don't think the first two should be "ByVal". The other way of passing parameters (I forgot what it's called...)

[wolfulus]

byref?

[username1]

byref?

Yes. Ja. Oui.