Hello,
I'm trying to turn the STFTptbypt routine into a dll and call it via VB.net. The 2d output array is of datatype TD1HDL. I created the shared library in labview and the function prototype looks like this(i took the error output out):
void STFTSpectrogramPtByPt(double x, long sampleLength, long timeIncrement, long windowLength, LVBoolean *initialize, long windowSelector, TD1Hdl *STFTSpectrogramX)
Here is the VB.net declaration:
Declare Sub STFTSpectrogramPtByPt Lib "C:\Documents and Settings\Bradley.Bumgardner\Desktop\labview dll\Dll Build\STFT.dll" _
(ByVal X As Double, _
ByVal Slength As Long, _
ByVal TimeIncrement As Long, _
ByVal Windowlength As Long, _
ByRef Initialize As Boolean, _
ByVal WindowSelect As Long, _
ByRef DoubleArray As Object)
So, to test i generate a sine wave (X) with 500 elements and pass it to the dll:
Dim mwindowlen As Long = mlen / 2
Dim mtimeinc As Long = 1
Dim minit As Boolean = False
Dim SpecOutArray As object
Dim Wsel As Long = 1
STFTSpectrogramPtByPt (X(0), mlen, mtimeinc, mwindowlen, minit, Wsel, SpecOutArray )
I don't get any errors, but I don't get any results either. any Ideas would be greatly appreciated! Thanx, B
