Home/ Questions/Q 8423549
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-10T03:45:09+00:00

I’m using this code to determine when a usb drive is attached to the

  • 0

I’m using this code to determine when a usb drive is attached to the computer (I want to look for a certain one, if that one is inserted then the program does something).

The part that I’m stuck on is how to write to that drive. If I use CFile to specify the file location, how do I know what drive letter windows assigned to that usb drive? That’s where my question is. How do I write to that usb drive.

Thanks,

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    When you receive the WM_DEVICECHANGE message for a USB disk then lParam will contain a pointer to the DEV_BROADCAST_VOLUME structure. Having verified that its dbcv_devicetype is DBT_DEVTYP_VOLUME you can then look at its dbcv_unitmask member which shows which drive letter(s) the disk has.

    • 0