LibreOffice 24.8 Yardım
Use VBA Err object to raise or handle runtime errors.
Err is a built-in VBA global object that allows:
to raise predefined Basic errors
to throw user-defined exceptions
to name the routine originating the error
to describe the error and possible solutions
The VBA Err object has the following properties and methods:
Err.Description As String
The Description property gives the nature of the error. Description details the various reasons that may be the cause of the error. Ideally, it provides the multiple course of actions to help solve the issue and prevent its reoccurrence. The Basic alias is the Error function for LibreOffice predefined errors.
Err.Number As Long
The error code associated with the error. Err object default property is Number. The LibreOffice Basic alias is the Err function.
Err.Source As String
Source indicates the name of the routine that produces the error. Source is an option for user-defined errors.
Err.Clear()
Resets description, Erl, number and source properties of current error. The LibreOffice Basic alias is the Resume statement.
Err.Raise(Number As Long, Optional source As String, Optional description As String)
Throws user-defined errors or predefined errors. The LibreOffice Basic alias is the Error statement.
Number: A user-defined or predefined error code to be raised.
Error code range 0-2000 is reserved for LibreOffice Basic. User-defined errors may start from higher values in order to prevent collision with LibreOffice Basic future developments.
Source: The name of the routine raising the error. A name in the form of "myLibrary.myModule.myProc" is recommended.
Description: A description of the problem leading to stop the running process, accompanied with the various reasons that may cause it. A detailed list of the possible course of actions that may help solve the problem is recommended.
Option VBASupport 1
Sub ThrowErrors
Dim aDesc As String : aDesc = Space(80)
On Local Error GoTo AlertAndExecNext
Err.Raise(91, "ThrowErrors", Error(91))
Err.Raise 2020, Description:="This is an intended user-defined error …"
Err.Raise(4096, "Standard.Module1.ThrowErrors", aDesc)
Exit Sub
AlertAndExecNext:
errTitle = "Error "& Err &" at line "& Erl &" in "& Err.Source
MsgBox Err.Description, MB_ICONEXCLAMATION, errTitle
Resume Next
End Sub
A short ClassModule, that wraps VBA Err object, can distribute Err properties and methods for standard LibreOffice Basic modules.
Option ClassModule
Option VBASupport 1
Public Property Get Description As String
Description = Err.Description
End Property
Public Property Get Number As Long
Number = Err.Number
End Property
Public Property Get Source As String
Source = Err.Source
End Property
Public Sub Clear
Err.Clear
End Sub
Public Sub Raise( number As Long, Optional Source As String, Optional Description As String)
Err.Raise number, Source, Description
End Sub
Function Exc As Object
Exc = New Exception
End Function
Sub aRoutine
try:
On Local Error GoTo catch:
Exc.Raise(4096, "myLib.myModule.aRoutine", _
"Any multi-line description for this user-defined exception")
' your code goes here …
finally:
Exit Sub
catch:
errTitle = "Error "& Exc.Number &" at line "& Erl &" in "& Exc.Source
MsgBox Exc.Description, MB_ICONSTOP, errTitle
Resume finally
End Sub
The Error statement or an Exception-like class module can be used interchangeably, while the latter adds extra features.