>Hi,
>
>Here's how I declared my external DLL function in my VB program:
>

<CODE>
>Private Declare Function make_call _
>  Lib "e:\programmes\visual basic\sync\system_call.dll" _
>  (ByRef thecommand As String) As Integer
></CODE>

>It seems about right but whenever I try to call my 'make_call' function, I get the following error message:
>
>'Incorrect dll call (error 49)'
>
>Here is an example of how I call 'make_call':
>

<CODE>
>nCurrentProc = make_call(cCommand) 'cCommand is a String var and is not empty
></CODE>

>
>What am I doing wrong?
>
>Stephane.

Have you tried declaring the paramater ByVal?

Is this DLL written in VB?