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 Windows Portable Device API Demo and Galaxy S7		  New Topic  Reply to Topic
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PeterPanino

862 Posts
Posted - Apr 27 2019 :  09:06:40  Show Profile  Reply
With ImageEn v8.5.0, I've tried this demo:

\ImageEn\Demos\ImageAcquisition\PortableDevices\WPDDemo.dpr

Windows Portable Device API Demo

But it does produce this error when trying it with my phone Samsung Galaxy S7 edge attached to my computer with an USB cable:



What could be the cause of the error?

These are the WPD logging lines:

Device count: 1
Enumerate devices
Device ID: \\?\usb#vid_04e8&pid_6860&ms_comp_mtp&samsung_android#7&33251f39&5&0000#{6ac27878-a6fa-4155-ba85-f98f491d4f33}
Connecting to: \\?\usb#vid_04e8&pid_6860&ms_comp_mtp&samsung_android#7&33251f39&5&0000#{6ac27878-a6fa-4155-ba85-f98f491d4f33}
DeviceValues: Valid
Connected to: \\?\usb#vid_04e8&pid_6860&ms_comp_mtp&samsung_android#7&33251f39&5&0000#{6ac27878-a6fa-4155-ba85-f98f491d4f33}
Connecting to: \\?\usb#vid_04e8&pid_6860&ms_comp_mtp&samsung_android#7&33251f39&5&0000#{6ac27878-a6fa-4155-ba85-f98f491d4f33}
DeviceValues: Valid
Connected to: \\?\usb#vid_04e8&pid_6860&ms_comp_mtp&samsung_android#7&33251f39&5&0000#{6ac27878-a6fa-4155-ba85-f98f491d4f33}
EnumObjects Failure: -2147020590
Connecting to: \\?\usb#vid_04e8&pid_6860&ms_comp_mtp&samsung_android#7&33251f39&5&0000#{6ac27878-a6fa-4155-ba85-f98f491d4f33}
DeviceValues: Valid
Connected to: \\?\usb#vid_04e8&pid_6860&ms_comp_mtp&samsung_android#7&33251f39&5&0000#{6ac27878-a6fa-4155-ba85-f98f491d4f33}
EnumObjects Failure: -2147020590

xequte

38189 Posts
Posted - Apr 28 2019 :  16:54:04  Show Profile  Reply
Hi Peter

Are you able to navigate to it using Windows Explorer?



Nigel
Xequte Software
www.imageen.com
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PeterPanino

862 Posts
Posted - Apr 29 2019 :  00:46:09  Show Profile  Reply
Hi Nigel,

in Windows Explorer, in the Shelltree the Galaxy S7 device is being displayed:



But as you can see, no content is displayed (0 elements) is displayed.

OS: Windows 7 SP1 x64
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xequte

38189 Posts
Posted - Apr 29 2019 :  01:23:38  Show Profile  Reply
Hi Peter

If Windows Explorer cannot access the device folders, then nor will ImageEn.

I tested a Galaxy S6 on Windows 10. By default, you cannot browse it from Windows Explorer. On the S6 I needed to explicitly allow access to MTP data (on the screen that pops up when you connect the phone to your PC).

After that I could browse its content in Windows Explorer and the ImageEn demo.


Nigel
Xequte Software
www.imageen.com
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PeterPanino

862 Posts
Posted - Apr 29 2019 :  01:34:15  Show Profile  Reply
Hi Nigel,

how can I "explicitly allow access to MTP data"?
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PeterPanino

862 Posts
Posted - Apr 29 2019 :  01:41:17  Show Profile  Reply
Hi Nigel,

now it works, as the phone has displayed a message to allow access.
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PeterPanino

862 Posts
Posted - Apr 29 2019 :  01:45:22  Show Profile  Reply
Is it possible to programmatically allow access on the phone so the user will not get this error?
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xequte

38189 Posts
Posted - Apr 29 2019 :  18:05:00  Show Profile  Reply
Hi Peter

Programmatically work around a security feature that is hardwired into the phone to prevent apps from accessing the data without user permission?

I do not believe so.

Nigel
Xequte Software
www.imageen.com
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