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Err

Contains information about runtime errors. Accept the Raise and Clear methods used to generate and clear run-time errors.

Description

The Err object is an inherent object with global scope: you don't have to create an example of it in your code. The properties of Err are set by an error-generator: Visual Basic, automatic object, or VBScript program.

The default property of the Err object is number. Err.Number contains an integer and can be used by the Automation object to return SCODE.

When a run-time error occurs, the properties of the Err are populated with unique information that identifies the error and information that can be used to process it. To generate run-time errors in your code, use the Raise method.

The Err object property is reset to zero or zero length string (""). The Clear method can be used to explicitly reset the Err.

The following example illustrates the use of the Err object:

On Error Resume NextErr.Raise 6 'generated an overflow error. MsgBox ("Error #" & CStr (Err.Number) & "& Err.Description) Err.Clear 'clears the error.

The Err object is an internal object with a global scope that contains all the information about the error.

On Error Resume next ignores all errors generated at run time

On Error Goto 0 cancels ignoring error actions

The main methods are: Clear, Raise

The main attributes are: Description, HelpContext, HelpFile, Number, Source

For a detailed description of its properties and methods, see the following example:

Methods of Err object

Clear

Description: clear all current properties of the Err object, that is, empty errors

Syntax: Err.Clear

Example:

On Error Resume next 'ignores all errors generated at run time

MsgBox 5/0

MsgBox Err.Number 'output the wrong value

Err.Clear 'clear all error messages

MsgBox Err.Number 'output 0

Raise

Description: define a runtime error

Syntax: Err.Raise (number,source,description,helpfile,helpcontent)

Parameter: Number: used to mark the error number

The Source tag produces the wrong object or application name

Description: description information about the error

Valid path to the Helpfile:help file

The theme of the Helpcontent:help file

Example:

On Error Resume Next

Err.Raise 22, "VBS script", "overflow", "c:\ test.txt" 'defines a runtime error

MsgBox "error:" & vbCrLf _

& "Number:" & Err.Number & vbCrLf _

& "Source:" & Err.Source & vbCrLf _

& "Description:" & Err.Description & vbCrLf _

& "Helpfile:" & Err.HelpFile

Err.Clear 'clear error

Properties of the Err object

Description

Description: returns or sets the description of the Error

Syntax: Description (conid)

Example:

Desc = Err.Description 'returns the description of Error

Err.Description = "Type mismatch" 'sets the description information for the Error

HelpContext

Description: returns or sets the topic for the specified help information

Syntax: HelpContext (string)

Example:

HelpContext = Err. HelpContext 'returns the help topic for Error

Err. HelpContext = "Type mismatch" 'set the help topic for Error

HelpFile

Description: returns or sets the address of the help file

Syntax: HelpFile (FilePath)

Example:

HelpFile = Err. HelpFile 'returns the address of the HelpFile

Err. HelpFile = "c:\ test.txt" 'sets the address of the HelpFile

Number

Description: returns or sets a value that represents an error

Syntax: Number (errid)

Example:

Number = Err. Number 'returns the id of Error

Err. Number = "c:\ test.txt" 'sets the id of Error

Source

Description: returns or sets the object (or the name of the application) that reports errors

Syntax: Source (string)

Example:

Source = Err. Source 'returns the object or application name of the Error

Err. Source = "box" 'sets the object or application name of Error

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