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

RecentError - Return the contents of the recent error string


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:

Part Description
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_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 Prototype

int USBm_RecentError( char *errorstring );

C Example

RobotBASIC

Recent Error and Debug String are handled by the RobotBASIC function usbm_ErrorSpecs().

usbm_ErrorSpecs()

Returns a string that contains information about the recent error string and debug string if any in the DLL. There are two sections seperated by the | character. You can use the Extract() function to extract each section seperately if desired. The sections are:

Recent Error

Debug String


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.

USBmicro can design your custom and semi-custom USB product. Email about USB design can be directed to " Robert " at usbmicro.com.

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