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DLPD4X00KIT: Problem in use D4100_usb.dll in LabVIEW

Part Number: DLPD4X00KIT

Hi,

I use LabVIEW to import D4100_usb.dll and it cannot be used. For example, I use ‘Get DMDTYPE’ in D4100_usb.dll, it give me a ‘-1’. Other functions can not get the correct value. Isn't the DLL not communicating normally with the DMD? Or is my header file wrong?