Online Development Notebook > Index > Programming Overview > DLL Commands > CloseDevice

CloseDevice - Close the open device


This is a USBm.dll function that closes access to a USB device.

Command Syntax:

true⁄false USBm_CloseDevice( device )

The USBm_CloseDevice function syntax has these parts:

Part Description
device Valid device from 0 to the maximum number of devices found (minus 1). Any other number results in a FALSE return.


Note: USBm_CloseDevice returns TRUE if the device successfully closes.

VB Declaration (USBmAPI.bas)

Public Declare Function USBm_CloseDevice _
    Lib "USBm.dll" _
        (ByVal device As Byte) _
    As Integer

VB Example

Dim result As Integer

    result = USBm_CloseDevice 3

This code fragment closes device number three. "Result" will contain TRUE or FALSE.

C Prototype

int USBm_CloseDevice( unsigned char device );

C Example



Returns true if the device was successfully closed. False otherwise.

Hardware:  U401 USB Interface    U421 USB Interface   U451 USB Interface

Programming:  USBm DLL Programming    Download Files

Application Notes:  U4x1 Application Notes    Misc Applications and Information    FAQ

While every effort has been made to make sure that the information posted on this site is correct, the author can not be held liable for any damages whatsoever for losses as a result of the application of this information. Use this information at your own risk.

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