Hello all,
If someone could help me out with this, I'd appreciate it very much.
I have this function signature in a Win32 .dll:
S32 AIL_enumerate_filter_attributes( HPROVIDER filter, HINTENUM *next,
RIB_INTERFACE_ENTRY *dest )
the RIB_INTERFACE_ENTRY is a struct defined like so:
struct RIB_INTERFACE_ENTRY
{
char const * entry_name;
int type;
int subtype;
}
I've attempted to define the struct in C# like so:
public struct RIBInterfaceEntry
{
[MarshalAs( UnmanagedType.ByValTStr, SizeConst=128 )]
public string name;
int entrytype;
int subtype
}
and wrapped the c++ method like so:
[DllImport( "mss32.dll", EntryPoint="AIL_enumerate_filter_attributes" )]
private static extern int EnumFilterAttributes( IntPtr filter, ref int next, ref
RIBInterfaceEntry dest );
and call it like:
IntPtr next = 0;
public RIBInterfaceEntry[] GetFilterAttributes( DigitalFilter filter )
{
while ( true )
{
RIBInterfaceEntry entry = new RIBInterfaceEntry();
if ( EnumFilterAttributes( filter.Handle, ref next, ref entry ) == 0 ) break;
// add the entry to an arraylist
}
// return arraylist.ToArray()
}
The DigitalFilter is another struct populated from another unmanaged call which holds
all the available filters for a digital audio driver. When the app is run, and the
GetFilterAttributes() method called, I don't get any run-time arrays, and stepping
through the code shows the RIBInterfaceEntry[] array has a length of 2, but the
individual properties of a specific entry don't seem right. The "Name" property has
what appears to be a null terminator in it, and the 2 int properties are 0 (which is a
valid value for the struct). But I was hoping to at least see a descriptive name of
the entry, as in a C++ application I have that does basically the same thing
(enumerates attributes, printf them to console window).
Thanks again, and in advance for any advice.
Ron
