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

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?

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

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

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.. :)

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

byref?

Quote:

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Originally Posted by wolfulus

byref?

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Yes. Ja. Oui.