Interop question C#

[IsaacB]

Hi, anyone has an idea of how to call a function with the following signature long csp2TimeStamp2Str(unsigned char *Stamp, char *value, long nMaxLength) in C# I declare it like this [DllImport("csp2.dll", EntryPoint="csp2TimeStamp2Str")] public static extern int csp2TimeStamp2Str( [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder blah, [MarshalAs(UnmanagedType.LPArray)] byte[] lpBuffer, int maxLength); Thanks in advance

[pubududilena]

hi pl check like this:- [DllImport("csp2.dll",EntryPoint="csp2TimeStamp2Str",ExactSpelling=false,SetLastError=true)] public static extern int csp2TimeStamp2Str(out char stamp,out char value,int maxLength); regards, pubudu.

[StealthyMark]

Do you have any documentation? The first parameter unsigned char *Stamp might be 1. a pointer to a simple value, possibly taken from an enumeration ref char stamp ref short stamp [MarshalAs(UnmanagedType.U2)] ref YourEnumType stamp 2. a [In] null-terminated unicode string [MarshalAs(UnmanagedType.LPWStr)] string stamp 3. a [Out/maybe In] null-terminated unicode string [MarshalAs(UnmanagedType.LPWStr)] StringBuilder stamp 4. a [In] data array, its length is given in parameter nMaxLength [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)] char[] stamp 5. a [Out] data array, its length is the return value of the function IntPtr stamp This goes for the second parameter as well, except for the last two possibilities, one is an [Out] parameter, the other one is an [In] parameter. Without some documentation it is very hard to tell. Mark