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Thread: Windows USB example

  1. #1
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    Default Windows USB example

    This program is an example of how to use an USB device in Qt.
    It is limited only to the HID devices class (joystick, mouse, keyboard...)
    It uses the standard Microsoft HID driver. If you use another driver you must know how it works.
    It demonstrates how to:
    -recognize a device by VID&PID
    -read/write
    -attach/detach notification
    Two examples are provided:
    -first example reads the XY position of a joystick
    -second example sends a message to the device and waits for the answer.

    See comments in source for details.

    Licence: GPL.

    I hope that this program can be useful to someone.
    Attached Files Attached Files

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    ASUKA_521 (25th March 2012), baetaekwon (19th February 2013), caodungviet (28th April 2011), Gamer (12th October 2013)

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    Default Re: Windows USB example

    Excellent!
    It might be a good idea if you'd add it to the examples section in the wiki, here it gets lost among the many other threads...
    http://www.qtcentre.org/wiki/index.p...egory:Examples
    Recommended off-line reading:
    The Foundations of Qt Development (ISBN: 1-59059-831-8)

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    Default Re: Windows USB example

    I don't like the idea of using global variables. And threads access those variables without a proper protection. This is bound to blow up sooner or later.
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


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    Default Re: Windows USB example

    I haven't looked at the code.
    Recommended off-line reading:
    The Foundations of Qt Development (ISBN: 1-59059-831-8)

  6. #5
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    Default Re: Windows USB example

    When you say:

    Qt Code:
    1. //to find a better way for this...
    2. while(lpdbv->dbcc_name[i] != 0)
    3. {
    4. s.append(lpdbv->dbcc_name[i]);
    5. i++;
    6. }
    7. s = s.toUpper();
    To copy to clipboard, switch view to plain text mode 

    Have you tried:

    Qt Code:
    1. QString s = QString::fromWCharArray(lpdbv->dbcc_name).toUpper();
    To copy to clipboard, switch view to plain text mode 

    Don't know if it'll work, it's just something that sprung into mind when I read your code/comment.

  7. The following user says thank you to squidge for this useful post:

    gavagai (25th March 2011)

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    Default Re: Windows USB example

    hi squidge,
    thanks for your suggestion. Yes, it works!
    I had not seen this static function to convert wchar_t in QString.
    Thanks again.

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    Default Re: Windows USB example

    Thanks for Share awesome Example for USB Communication...
    but i have problem to devide...... The "Device Class GUID" is {6bdd1fc6-810f-11d0-bec7-08002be2092f}
    can u please explain me more.

    i'll try this type #define HID_CLASSGUID {0x6bdd1fc6, 0x810f, 0x11d0,{ 0x08, 0x00, 0x2b, 0xe2, 0x09, 0x2f }}
    but result is same not connected ....

    please help me, i m waiting for u r kindly reply...
    thanks in advance.

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    Default Re: Windows USB example

    Don't use the class GUID returned by device manager, it don't works. It is the device SETUP GUID class. We need the device INTERFACE GUID class (see http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx).
    Try this:
    - be sure that your device is installed and recognized in the system
    - start regedit and search for your vid&pid (VID_XXXX&PID_XXXX) in the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\DeviceClasses. You can get more of a result.
    - Try to use the parent class GUID where the descriptor starts with the type of device (##?#HID#VID... or ##?#IMAGE#VID...).
    For more informations see the examples in http://msdn.microsoft.com/en-us/library/ff551069.aspx

    Your device seems to be an image device. I do not know if endpoint size (InputBuffer and OutputBuffer size) is correct for this device. Depends on the driver.

    Good luck

  11. The following user says thank you to gavagai for this useful post:

    pavanbarot (1st April 2011)

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    Thumbs up Re: Windows USB example

    Thanks a lot it's works fine....
    Attached Images Attached Images

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    Default Re: Windows USB example

    ok, it works but I think it is not exactly correct.
    Your image shows a generic class GUID for all USB devices (##?# USB VID # ...).
    Better to use a GUID for a specific class of devices.
    Search again to find something like # #? # IMAGE # VID_XXXX&PID_XXXX and uses its GUID.
    Maybe I'm wrong, but I think for read / write operations you must use a more specific GUID.

  14. #11

    Default Re: Windows USB example

    I am new member to this forum. So this information is useful for me. I will try this.

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    Default Re: Windows USB example

    sorry but i don't understand about The "Device Class GUID", please you help me?? for example,
    #define HID_CLASSGUID {0x6bdd1fc6, 0x810f, 0x11d0,{ 0x08, 0x00, 0x2b, 0xe2, 0x09, 0x2f }}
    so :{ 0x08, 0x00, 0x2b, 0xe2, 0x09, 0x2f }.what is it??
    please explain for me,i don't understand about it. what it means?? sorry ,because my english is not good

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    Default Re: Windows USB example

    They are device class GUIDs used in device detection and classification. See the Windows DDK for more information and other GUIDs.

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    Default Re: Windows USB example

    Hi all.
    And why different descriptors for reading and writing device?
    (You can also open once a one descriptor for reading and writing!)

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    Default Re: Windows USB example

    Quote Originally Posted by kuzulis View Post
    Hi all.
    And why different descriptors for reading and writing device?
    (You can also open once a one descriptor for reading and writing!)
    You can but that will not work across all devices. Some devices for example are read-only, so if you try to open them as read/write the call will fail, but if you have seperate read and write only the write will fail, so you know the device is read-only and don't need to do additional work (such as reopening as read only and setting a read-only flag). Typically however you will know this before writing code but as an example it is impossible to know this in advance.

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    Default Re: Windows USB example

    aah, I understand, thank you.

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    Default Re: Windows USB example

    i can conect with USB, but when i open it ,so my computer is broke dow,, why such that??

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    Default Re: Windows USB example

    Please rephrase. Don't understand.

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    Default Re: Windows USB example

    sorry, because my english is not good..i can connect this project with USB,but when i open this project ,my computer can't run.
    please help me!!

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    Default Re: Windows USB example

    You mean it reboots?
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


  24. The following 2 users say thank you to wysota for this useful post:

    caodungviet (28th April 2011), Gamer (12th October 2013)

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