I have a function in a C++ dll defined as

Code:
FMSIO_API BOOL SetLogData( const char *dbName, int id, int boreholeID, int nameID, float startDepth, float depthSampleRate, int values_NUM_PTS,	 float * logData, const char *apiCode  "UNKNOWN",	 const char *runDate  "00:00:00");
im trying to figure out how to pass the data for the logData element..

I declare

Code:
<DllImport("c:\windows\system32\FMSIO.dll", EntryPoint:="#35", CallingConvention:=CallingConvention.Cdecl)> Public Shared Function SetLogData(ByVal dbName As String, ByVal id As Int32, ByVal boreholeID As Int32, ByVal nameID As Int32, ByVal startDepth As Single, ByVal depthSampleRate As Single, ByVal values_NUM_PTS As Int32, ByVal logdata() As Single) As Int32
and then try

Code:
Dim logdataout() As Single
Dim logdataptr As System.IntPtr
logdataout(0) = 5
logdataout(1) = 4
logdataout(2) = 5
logdataout(3) = 5
logdataout(4) = 4

 t = s.SetLogData("C:\FMS2_build.mdb", 6724, 1006, 1407, 100, 0.1524, 5, logdataout())
but this just results in an error:

Code:
An unhandled exception of type 'System.NullReferenceException' occurred in FMSLoad.exe

Additional information: Object reference not set to an instance of an object.
so I guess I am passing the data the wrong way - can anyone correct the above and show me how to pass an array of singles/floats by value like this?