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Question about inf file, Virtual USB COM port, and USB CDC device

Hi experts
My windows application communicates with an external hardware device via a virtual USB COM port. I, therefore, need to include the inf file as part of the installation in order to tell the PC about the Vendor and the Product ID of the USB CDC device. No new driver is req'd; just the standard Windows driver 'usbser'.

But I notice that even after I use the command line: rundll32 setupapi.dll,InstallHinfSection DefaultInstall 128 ./<??.inf>

When I plug in the USB cable, a 'Found New Hardware Wizard' dialog box still pops up and asks user to install software for the hardware. My question is: is this normal? Or the above command line hasn't taken effect?

Thanks in advance.
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dominicwong
Asked:
dominicwong
1 Solution
 
David Johnson, CD, MVPOwnerCommented:
it will look but not find a better driver (which is what it is trying to do), normal behaviour
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dominicwongAuthor Commented:
Thank you.
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