Online Development Notebook > Index > ODN > USBm DLL Programming > DLL Commands > DeviceValid

DeviceValid

Description:

This is a USBm.dll function that returns indication of validity from a USB device.

 

Command Syntax:

true⁄false USBm_DeviceValid(device)

The USBm_DeviceValid 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.

 

Remarks:

Note: USBm_DeviceValid always returns TRUE if the device is valid, otherwise FALSE.

 

VB Declaration (USBmAPI.bas)

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

 

VB Example

Dim result As Integer

    result = USBm_DeviceValid 3

This code fragment shows that result is loaded with TRUE if device three exists, or with FALSE if the device does not exist.

 

C Example

-TBD-

Hardware:  U401 USB Interface    U421 USB Interface
Programming:  USBm DLL Programming    Download Files
Application Notes:  U4x1 Application Notes    Misc Applications and Information    FAQ