USB Device Removal Request Alert

[Prakhar 0]

Hi fellow autoiteers, I am trying to build an app that copies the data from a USB device to a desired folder of HDD in the computer.

But the problem is that when i try to remove the USB stick via "Safely remove hardware"while it is copying , it states that drive cannot be removed a program is accessing it.I want to stop the copying when there is any request for removal.Is there any solution for this. I've already tried $WM_DEVICECHANGE but it is of no use to me.

HELP !!! HELP !!!!!!!!!!!!!!!!!