linking to 3rd party windows DLL

[squidge]

I want to move a desktop Windows app, which communicates with certain devices through a system USB port, from the Visual Studio development environment to the Qt environment. Qt makes the GUI interface very easy but accessing the USB port is not so simple. USB communication requires making calls to functions in a 3rd party DLL library (from FTDI, a USB chip maker).

I use FTDI chips a lot and by far the easiest way to use them is to use the provided virtual serial port driver, and then you can talk to your device via Qextserialport and the like.

FTDI also supply full library files and include files should you not wish to do this, so its just a matter of calling functions in that library. No need for importing functions from DLLs. The provided code from FTDI does all that for you.