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

RecentError

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Description:

This is a USBm.dll function that returns a string with error information.

 

Command Syntax:

true⁄false USBm_RecentError(string)

The USBm_RecentError function syntax has these parts:

 

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_RecentError always returns TRUE.

Note: USBm_RecentError does not affect the internal error string.

 

VB Declaration (USBmAPI.bas)

Public Declare Function USBm_RecentError _     Lib "USBm.dll" _         (ByVal errorstring As String) _     As Integer

 

VB Example

Dim strng As String * 255     USBm_RecentError strng     frmStatus.lstDevices.AddItem "About the USBm DLL: " & strng

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

 

C Example

-TBD-

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Hardware:  U401 USB Interface    U421 USB Interface

Programming:  USBm DLL Programming    Download Files

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