Calling C++ dll

[KingLouie]

I want to call a dll created in c++.
in c++ it locks like this:

int open(LPCTSTR lpszFileName)
...
...

in vB:
Private Declare FileOpen Lib "c:\mydll.dll" Alias "open" (byval lpszFileName as String) as Long
...
a=FileOpen("c:\mifile.ixx&quot

At this point the runtime Error 49 appears ("Bad dll calling convention&quot

calling procedures whitout passing variabes works correctly

Tanx for any hint

 

[williamu]

The Line should read:

Private Declare Function FileOpen Lib "c:\mydll.dll" Alias "open" (byval lpszFileName as String) as Long

Since the DLL Code returns a Handle (int) to the OpenFile.

HTH


William
Software Engineer
ICQ No. 56047340

 

[KingLouie]

sorry this was a mistake but

Private Declare Function FileOpen Lib "c:\mydll.dll" Alias "open" (byval lpszFileName as String) as Long

still does not work

 

[williamu]

Well it may be that the FileOpen routine is expectine other parameters other than the file name. Have you checked this.
William
Software Engineer
ICQ No. 56047340

 

[KingLouie]

i'm at home now so i cant check. but tomorow i will check
thanx

 

[Hass]

Hey,

Maybe your Dll is using the _cdecl calling convention which VB has a problem. Check out article Q153586 at MSDN