I implemented file transfer from windows pc to an android device, which is connected with MTP to the computer. The copy implementation is ready (I used this example: http://code.msdn.microsoft.com/windowsdesktop/Portable-Devices-COM-API-fd4a5f7d).
Now I would like to improve UI, I would like to offer a folder selection dialog, where the user can select a MTP device folder, where I will save the file (CLSID_FileOpenDialog with FOS_PICKFOLDERS works nice). Note that simple file save dialog doesn’t work, because you will get error from dialog: “You can’t save here”.
The result of folder browsing will be similar to this:
::{20D04FE0-3AEA-1069-A2D8-08002B30309D}\\?\usb#vid_04e8&pid_6860&mi_00#6&2296b879&0&0000#{6ac27878-a6fa-4155-ba85-f98f491d4f33}\SID-{10001,SECZ9519043CHOHB,12635222016}{01B8016B-0164-00F2-E100-55012C014001}
usb#vid_04e8&pid_6860&mi_00#6&2296b879&0&0000#{6ac27878-a6fa-4155-ba85-f98f491d4f33}
I know this is the device, IPortableDeviceManager use this as device id.
SID-{10001,SECZ9519043CHOHB,12635222016}\{01B8016B-0164-00F2-E100-55012C014001}
This is the path on device. These GUIDs are the WPD_OBJECT_PERSISTENT_UNIQUE_ID property of the device objects.
With this information I can select the device and find the folder in the device, so I can do the copy.
My problem is that I also would like to select a default directory in my folderbrowsedialog on the device, and I can’t create the upper mentioned path. Note if I give that as a default path, it starts the browsing in the correct folder.
The problematic part is the starting GUID, which I can’t get:
::{20D04FE0-3AEA-1069-A2D8-08002B30309D}
I also looked into registry. I found this GUID in only one entry:
HKEY_USERS\S-1-5-21-2044730494-4069800027-1247311059-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\CLSID{20D04FE0-3AEA-1069-A2D8-08002B30309D}\DefaultIcon
which value is this:
C:\Windows\System32\imageres.dll,-109
(CLSID subfolder contains more GUID, so I can’t find, which is the correct one)
Do you have idea how to get this GUID to be able to construct the whole default path?
That guid represents the Computer folder, the shell namespace extension for MTP devices is a Computer folder delegate. You can use this guid as a constant to construct the parsing name for your folder browser.
Regards,
lisa