Calling unmanaged code C++ dll from VB.NET -


i have problem reuse c++ dll used vb 6.0 vb.net.

a mate of mine programmed code in vb6.0 called ansi c++ dll programmed in vc 6.0++.

the function declared following;

ctype dword cconv iniciagestion(hwnd newhventana, char *ficheroini, char *mensaerror)

the former code in vb6.0 called dll in way

status = iniciagestion(me.hwnd, "drvcomm2.ini", mensaerror)

where mensaerror output parameter defined as

public mensaerror string * 256

now can use dll vb.net?

i have problem declaration of third parameter.
using declaration

<dllimport("gestionprg.dll", callingconvention:=callingconvention.stdcall, charset:=charset.ansi)> _ public shared function iniciagestion(<marshalas(unmanagedtype.i4)> byval integer, <marshalas(unmanagedtype.lpstr)> byval b string, <outattribute(), marshalas(unmanagedtype.lptstr)> byref c string) long

and function called following

dim mensaerror string  class1.iniciagestion(me.handle, "c:\\windows\\drvcomm2.ini", mensaerror)

i debugging , function called when going assigned value mensaerror in c++ code exception produced.

can me in declaration in vb.net?

please use 4 whitespaces in front of code - makes lot easier read...

<system.runtime.interopservices.dllimport("yourdll.dll")> _ public shared function iniciagestion(byval intptr, byref b string, byref c string) long end function  private sub callcode()     dim mensaerror string = ""     iniciagestion(me.handle, "c:\windows\drvcomm2.ini", mensaerror) end sub

should job...


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