CODEWITHSUNDEEP
c#usb
Vin
Vin

Reputation: 105

Connect and disconnect USB programmaticaly "WITHOUT UNPLUG AND REPLUG"

I need to connect and disconnect USB programmatically. That is, I have inserted the USB device. I need to transfer the file using C#, .NET application. The application will watch the particular folder and transfer the file from that folder to a USB drive. I need to disconnect the USB device after the file is transfered and connect the USB when needed - without unplug and replug.

What would be some code to do it or is there any DLL file available?

Main thing: NOTE, NOTE: Without unplugging and replugging the USB device.

Upvotes: 2

Views: 6341

Answers (2)

Ilya
Ilya

Reputation: 5613

If your goal is to make a certain disk volume unavailable while you're not using it, a more sensible approach might be to use the volume management APIs, e.g. by using the IOCTL_VOLUME_OFFLINE control code. (I'm assuming that you know which drive letter belongs to your USB disk.)

Alternatively, you can disable and enable the volume device programmatically with the CfgMgr / SetupAPI -- the same as right-clicking the volume in Device Manager and choosing Disable would do. (For information about using SetupAPI, please review the DevCon sample code provided with the Windows WDK, and see MSDN for functions such as SetupDiChangeState.)

The latter option might require a privileged user account.

Upvotes: 3

sybreon
sybreon

Reputation: 3156

I'm not exactly sure, but it can be done. In Linux, I've experienced certain situations where power is disconnected to a device programmatically. The kernel usually does this if the connected USB device is exhibiting too many errors. So, it should be possible to do this even in Windows. You may need to write your own external DLL to do it though.

Upvotes: 0

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