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Thread: HID rfid reader

  1. #1
    Join Date
    Sep 2014
    Krusevac, Serbia
    Qt products
    Unix/X11 Windows Android

    Angry HID rfid reader


    I want to make qt widget app to read code from rfid reader but the problem is becouse my app need read in backround. The user will use computer for other job, reader is for background process

    the reader is conected on USB port and detected in windows as HID keyboard device.

    First problem is how to use only in qt app but not use in other app

    Sorry on my bad englisch

  2. #2
    Join Date
    Jan 2008
    Alameda, CA, USA
    Thanked 666 Times in 656 Posts
    Qt products
    Windows Android

    Default Re: HID rfid reader

    First problem is how to use only in qt app but not use in other app
    See this article from github discussing libusb. Like the device described in this post, if your RFID reader emulates a keyboard, you will probably have to replace its driver with one that allows exclusive access (winusb) and use libusb to control it. There is probably no Qt-level direct support for USB like there is for serial ports.

    my app need read in background
    You can either write a Windows service or implement a normal program with a hidden interface. You can use Qt's QLocalSocket to connect your client and server apps to transmit RFID information.
    <=== The Great Pumpkin says ===>
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

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