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

DeviceProd

Description:

This is a USBm.dll function that returns the Product string from a USB device.

 

Command Syntax:

true⁄false USBm_DeviceProd(device, string)

The USBm_DeviceProd 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.
string Any valid string expression.

 

Remarks:

In VB the string passed as an argument must be large enough to hold all the characters that the function places in the string. The best way to acheive this is to set the string to a large size with the String function as in this code:

strStrng = String(250, " ")

Note: USBm_DeviceProd returns TRUE for a valid device.

 

VB Declaration (USBmAPI.bas)

Public Declare Function USBm_DeviceProd _
    Lib "USBm.dll" _
        (ByVal device As Byte, _
        ByVal product As String) _
    As Integer

 

VB Example

Dim strng As String * 255

    USBm_DeviceProd 3, strng
    frmStatus.lstDevices.AddItem "Product: " & strng

This code fragment shows that strng is loaded with the "product" text of device three. Assuming that the form called "Main" exists with a text box called "Info", the "product " information will be made visible to the user.

 

C Example

-TBD-

Hardware:  U401 USB Interface    U421 USB Interface
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