Hi everybody, I am calling an external DLL via CLFN and have a weird problem. I'm using a function to connect to a USB device and when I manually enter the values for VID, PID and SerialNumber (these three values identify the USB device) in the SubVI, where the DLL is called, it works 100% of the time. But whenever I call the SubVI in another VI and simply pass the values, it won't work at times. I used the lamp for debugging, but it did pass the values (as far as I can see) correctly. Info: The DLL I'm calling is a wrapper for a C++ DLL, I pass VID and PID as unsigned words and SerialNo as const string*. The CLFN configuration looks like this: int8_t ConnectToHidDevice(uint16_t VID, uint16_t PID, const CStr SerialNo); Anyone ever had a similar problem? I'd be pleased with any input, this problem is driving me nuts. Regards, Pedro

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rolfk,

it was indeed the reading method, that caused the error. I switched over to read from spreadsheet and it's working now. Thanks for the input, though.

Regards,

Pedro

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