GPF When using ReadFile of Windows SDK

Hello

I'm trying to use a USB device that maps to a virtual com port in my application LabView CVI (8.5).  I get the following error:

Declare numBytesRead as a DWORD rather than a LPDWORD, then pass & numBytesRead in the service. It is a common ambiguity with the types of parameters that must you be aware of how this parameter is intended to be used. This is an output parameter, so you must allocate storage on the stack by declaring a variable of the appropriate type (DWORD) and then pass the address of the storage (& numBytesRead).

Tags: NI Software

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