marshal unsigned char pointer

[cbachellam]

Hello,
I am trying to call c++ dll function calls from C#. The c++ dll function
takes in pointer to unsigned char array. Can anybody help me in what
marshalling parameter value that i have to declare in C# side.

For eg:
in c++ X.dll the function is:
extern "C" __declspec(dlle xport) void Getcharpointer( unsigned char* v)
{
//Just for test purpose, i alter and check on the C# side whether it
persists. This is another thing which i want to do but i cant.
v[0] = 'p';
}

on the c# side declaration:
--------------------------
[DllImport("X.dl l",CharSet=Char Set.Auto)]
static extern Getcharpointer([MarshalAs( UnmanagedType.L PStr )]
System.String IncharPtr)
-----

IF i try this syntax, the change doesnt persist in the value of the first
index of unsigned char pointer array.
Can anybody help me here?.Is this is the right way?.

Thanks.,
Chellam.

[Tom Shelton]

On Tue, 14 Sep 2004 16:13:05 -0700, cbachellam wrote:

Hello,
I am trying to call c++ dll function calls from C#. The c++ dll function
takes in pointer to unsigned char array. Can anybody help me in what
marshalling parameter value that i have to declare in C# side.

For eg:
in c++ X.dll the function is:
extern "C" __declspec(dlle xport) void Getcharpointer( unsigned char* v)
{
//Just for test purpose, i alter and check on the C# side whether it
persists. This is another thing which i want to do but i cant.
v[0] = 'p';
}

on the c# side declaration:
--------------------------
[DllImport("X.dl l",CharSet=Char Set.Auto)]
static extern Getcharpointer([MarshalAs( UnmanagedType.L PStr )]
System.String IncharPtr)
-----

IF i try this syntax, the change doesnt persist in the value of the first
index of unsigned char pointer array.
Can anybody help me here?.Is this is the right way?.

Thanks.,
Chellam.

using System.Text.Str ingBuilder instead of string...

--
Tom Shelton [MVP]