How do I perform an FFT or ReFFT in VB6 using measurement studio

I am trying to make a filter by taking a 1D array of voltages and doing a ReFFT() and padding the high frequencies in the array with a value of zero and then going back to time domain with ReInvFFT(). Here is my code which does not seem to be filtering any high frequency content.
lngReturn = frmMain.CWAI1.AcquireData(varData, varBinaryCodes)
frmMain.CWDSP1.ReFFT varData, realdata, imgdata
For i = (UBound(realdata) / 100) To UBound(realdata)
realdata(i) = 0
imgdata(i) = 0
Next
frmMain.CWDSP1.ReInvFFT realdata, imgdata, varData
After the function is done varData has a 1D array of filtered real voltage values. It does not seem to be filtering and I get back exactly what I pass in. I know it must be something simple that I am missing perhaps the variable cannot be used to pass in and then back out the values??
Please shed some light as there are NO examples of this use of FFT.
Thanks

Arthur,
Thank you for your reply. But at this point, one of my points of confusion is what software I have available to me. I wish I had a useful central help desk to call up and just say, "Hey, load me up with all of the professional version(s) of Visual
Studio. But I do not know what we have license to. And I kind of need to know what the options are, so that I can ask a specific question of our vast buracracy.
For now, I have downloaded only free versions of Visual Studio client software. Since my company does have servers running Microsoft SQL Server, I am going to assume that we have proper licensing for those servers. But does that server license
allow me to get any professional versions of the PC client software for the various Visual Studio(s) 2012?
And if I get a professional version of Visual Studio 2012, does that do away with the three different flavors that I have right now? I have 2012 versions of SQL Server Management Studio, Visual Studio Express, and Visual Studio Shell (Integrated).
Your feedback is much appreciated.
Thanks!

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