Pinvoke reading files, returning char * values.

Hello,
I am trying to use an Win32 DLL developed using Visual C++ 6.0 in my
C# .net application.

The signature of the original function is as follows :

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


So, this function takes the path of a file and a password and returns
back a string.


I translated like this :


[DllImport("STLKit.dll", CharSet=CharSet.Auto )]
public static extern bool GetXMLString(string inputFileName,
string
password,
ref
StringBuilder output,
string
errorMessage);


However this is not working at all and the output parameter is being
populated by weird messages like "publictoken" or "Dependancy
Evaluated" and so on.

My questions are :

Are these the correct mappings ?
Could there be a problem sending a file path to the function ?


Any help/pointers would really be very appreciated.


Thanks,
Anirudh

.

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