Pinvoke problem - only first character being sent.

Hello,

I am trying to use Pinvoke to use a Win 32 Visual C++ 6.0 dll in a .net
C# application.

This is the original function signature.


BOOL __stdcall GetXMLString(
const char* strInputFileName,
const char* strPassword,
char* strOutput,
char* strErrorMessage)


This is the signature i am using :


[DllImport("C:\\STLKit.dll", CharSet = CharSet.Ansi)]
public static extern bool GetXMLString(
[In][MarshalAs(UnmanagedType.LPTStr)]string
strInputFileName,
[In][MarshalAs(UnmanagedType.LPTStr)]string strPassword,
StringBuilder strOutput,
StringBuilder strErrorMessage);


The problem is that ONLY the first character of the string
strInputFileName is being passed to the function.
Do I need to allocate memory for the strInputFileName ?


Any response would be highly appreciated.


Thanks,
Anirudh

> [DllImport("C:\\STLKit.dll", CharSet = CharSet.Ansi)]
> public static extern bool GetXMLString(
> [In][MarshalAs(UnmanagedType.LPTStr)]string
>strInputFileName,
> [In][MarshalAs(UnmanagedType.LPTStr)]string strPassword,

Get rid of the attributes, you don't need them and in this case the
MarshalAs is incorrect.


Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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