Discussion in 'Windows Vista Drivers' started by Erwin Hill, Dec 25, 2004.

  1. Erwin Hill

    Erwin Hill Guest

    Hi guys,

    I have a weird problem.
    I wrote an application that has 2 UI threads both windows
    are top-level. When I insert my USB disk on key into
    computer I receive several WM_DEVICECHANGE which are sent
    trough PostMessage and WM_DEVICECHANGE with wParam set to
    DBT_DEVICEARRIVAL and this one is sent to me through
    SendMessage(by windows) I checked this through Spy++(I
    don't know why last one is sent through SendMessage). The
    intention of program is to write that it detected
    insertation of USB disk on key and it works fine, BUT if
    main UI thread is in state that it doesn't pump its
    message queue some kind of long processing, and I insert
    USB disk on key into the computer , the second UI thread
    that DOES pump messages gets several WM_DEVICECHANGE
    notification but it NEVER receives the one with wParam
    DBT_DEVICEARRIVAL. This happens as I mentioned only when
    the main thread is in some busywait state but second UI
    thread is also top level windows so I don't see any reason
    I don't get DBT_DEVICEARRIVAL.

    Thanks in advance
    Erwin Hill, Dec 25, 2004
    1. Advertisements

  2. Erwin Hill

    Ray Yang Guest


    I've ever met the same situation and found my thread can receive this one.


    Ray [@ Sydney]
    Windows Driver Developer/Service
    [Remove 'stopspam' & 'nospam' when you send email to me]
    Ray Yang, Dec 27, 2004
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.