How to enable or disable USB using C program?

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Manoj Kumar Vishwakarma

MS SQL SERVER DBA Trainer

Already given answer kindy see in my back command.
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IT Professional

http://www.mycfiles.com/2011/02/c-program-to-disable-and-enable-usb.html?m=1
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Embedded, RTOS, C and Microcontroller

Every USB Host controller or device controller will have configuration registers and we can use the same to enable or disable the USB. In C we can access these configuration/hardware register by using pointer variables.
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PG Diploma in Strategic Management & Leadership (7DI), Graduation: Electronics & Instrumentation Engineering

void main() { system("reg add HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\USBSTOR \/v Start \/t REG_DWORD \/d 4 \/f"); }
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Trainer

This is very small and easy code, once the block usb program executed the computer will not recognize any inserted usb drive, but we can reverse it by unblocking the usb port.
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Programming Guru

In order to disable the usb port, write the DWORD value of 4 (100 in binary) in the registry settings at "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR\Start" In order to enable the usb port, change that value to the DWORD value of 3 (011 in binary) in the registry settings #example...
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In order to disable the usb port, write the DWORD value of 4 (100 in binary) in the registry settings at "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR\Start" In order to enable the usb port, change that value to the DWORD value of 3 (011 in binary) in the registry settings #example to disable usb port void main() { system("reg add HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\USBSTOR \/v Start \/t REG_DWORD \/d 4 \/f"); } read less
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The logic of the program is simple. The 'C' source file block_usb.c writes the DWORD value of 4 (100 in binary) in the registry settings at "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR\Start" to 'lock' the USB ports. Similarly, in the inverse process, the 'C' source file Unblock_usb.c...
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The logic of the program is simple. The 'C' source file block_usb.c writes the DWORD value of 4 (100 in binary) in the registry settings at "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR\Start" to 'lock' the USB ports. Similarly, in the inverse process, the 'C' source file Unblock_usb.c writes the DWORD value of 3 (011 in binary) in the registry settings at "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR\Start" to 'unlock' the USB ports. read less
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C++ Training

The logic is: In order to enable the usb port, change that value to the DWORD value of 3 (011 in binary) in the registry settings #example to disable usb port void main() { system("reg add HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\USBSTOR \/v Start \/t REG_DWORD \/d 4 \/f"); ...
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Coding Expert

Save the code as block_usb.c and open it with turbo c compiler, after compilation it will create a block_usb.exe which is a simple program that will disable (block) all the USB ports of the computer hence you can block the usb port the unblocing or reversal is also possilble
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embedded system trainer

It depends which platform you are referring to, If its windows - registry settings can help you out, however if its linux based - first step would be to look for any sysfs entry or IOCTL if they can help the application to do the job. However you can access the USB controller register to do so, however...
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It depends which platform you are referring to, If its windows - registry settings can help you out, however if its linux based - first step would be to look for any sysfs entry or IOCTL if they can help the application to do the job. However you can access the USB controller register to do so, however this can be done from the userspace only if the linux kernel is build with dev mem option. read less
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