chrome.usb device not found on Windows

[googlechrome]

chrome.usb device not found on Windows

[reillyeon]

@atvvarna You need to do with it says, add a "usbDevices" permission dictionary to the "optional_permissions" section of the manifest like this:

"optional_permissions": [
    {
      "usbDevices": [
        {
          "vendorId": 3034,
          "productId": 10290
        },
        {
          "vendorId": 3034,
          "productId": 10296
        }
      ]
    }
  ]

(copied from the Radio Receiver app)

[reillyeon]

Are you calling the function during a user gesture? Permissions must be requested in the context of an event handler for a user gesture such as clicking a button.

[kjantzer]

Hey @ohmmmo

I too am trying to get the 450 Turbo to work. I figured out how to fix the "device not found" issue, but unfortunately can't get anything to print.

To find the device you'll need to update the product ID in two places:

index.js:
var productId = 0x0021; // changed from 0x0020

manifest.json
"optional_permissions": [ {"usbDevices": [{"vendorId": 2338, "productId": 33}]}] // changed from 32

[kjantzer]

#176 fixes this issue. You still need to make the changes I listed above though.

[mangini]

Thank you @kjantzer . I've added your information in the sample's README.md

[sdaclin]

Hi @kjantzer, did you finally manage to print via USB on WIN 7 ?

I'm facing the same problem with the API on Win7. I manage to find the device via chrome.usb.getDevices but I can't open it.
I wonder if it's possible to open a device like an usb thermal printer on win 7.

[kjantzer]

@sdaclin sorry, but I only tested on a Mac

[sdaclin]

I have done further investigations and chrome usb api can't manage generic text driver. I'm going to write an issue on chromium tracker.

[sdaclin]

I have tested http://zadig.akeo.ie/ generic usb drivers for windows and it seems to be ok.

[RimaSGit]

@kjantzer I was able to detect our printer using the app and also allowed the permission request. But it could not actually print using that printer even after allowing access. I am using Chrome browser on Mac. Any help?

[kjantzer]

@RimaSGit – did you apply this patch: 9b9fdd6

Other than trying that, I don't have any other advice. I ended up needing to print with the label writer.

[RimaSGit]

@kjantzer Thank you Kevin. I have the same patch. The other thing I wanted to make sure is the info endpoint which is “2”, I am not sure how to I get that for my device?
I did use the chrome.usb.listInterfaces to get all that data, there are many endpoints listed in it, so I am not sure which one to use and if I need to convert this to raw address before using it?

Thanks a lot.

[kjantzer]

Unfortunately what you said goes right over my head. I have very little experience with hardware and low level programming.

I know that on a mac you can get some device info by opening "System Information"

[atvvarna]

I've set everything but always get in the log:
App was not granted the "usbDevices" permission.
Object {message: "Optional permissions must be listed in extension manifest."}

I didn't see the permission window.
Any help?

[RimaSGit]

I think you need this in your manifest.json for usb permissions

"usb_printers":{

"filters":[

  {

    "vendorId": yourvendorID

  }

 ]

},

"permissions": [

"usb",

...........

From: atvvarna <[email protected]mailto:[email protected]>
Reply-To: GoogleChrome/chrome-app-samples <[email protected]mailto:[email protected]>
Date: Friday, May 20, 2016 at 12:15 PM
To: GoogleChrome/chrome-app-samples <[email protected]mailto:[email protected]>
Cc: Microsoft Office User <[email protected]mailto:[email protected]>, Mention <[email protected]mailto:[email protected]>
Subject: Re: [GoogleChrome/chrome-app-samples] chrome.usb device not found on Windows (#126)

manifest

[atvvarna]

Thanks for the fast reply, yes I have it there but it seems that messed up as tried different IDs.
Now I have:
App was not granted the "usbDevices" permission.
index.js:54 Object {message: "This function must be called during a user gesture"}

[atvvarna]

I didn't modify the code at all, just change the vendor/productIDs.
The printer is found by chrome without any problems and I can print trough standard print dialog of chrome.

[atvvarna]

I've just found that in chrome://settings/contentExceptions#plugins if I start the application I see that chrome automatically add block exception. Even if I manually add allow the block is still added on top. What can cause that?