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Enables error handling for the subroutine and specifies the address of the subroutine in a procedure ; must also be used to disable error handling for the subroutine.
Syntax
If an error occurs, go to line
If there was an error, continue
If there is a GoTo error 0
The syntax for the On Error statement can take one of the following forms:
| Explanation | Description |
|---|---|
| GoTo Line Error | Activates our own error-handling routine that starts with the line defined on the required line argument .
The reason for the line is any line label < / a> or line number .A if error execution occurs, the control forks positive line, which means that error handling is enabled. The specific line must be in the same sequence as the On Error statement; in protOtherwise you will get a perfect compile-time error. |
| Then continue if there is an error | indicates that if a runtime error occurs, monitoring continues with the immediately after the statement in which the error occurred, and execute. form this instead of On Error GoTo when accessing objects. |
| If there is a GoTo 0 error | Disables all error handling allowed in the routine for the current day. |
Unless you use the On Error statement, a runtime error is undoubtedly fatal; that is, an error message will also be displayed and execution will stop.
An “activated” error event is an event that was activated with an On Error statement; An “active” error trainer is an activated handler that handles a serious error. If an error occurs and an error handler is active (between the entry indicating the error and Resume -, Exit Sub -, exit function, or exit property statement), all Error handlers of the current procedure cannot o To work this particular bug. Control returns to the telephone dialing procedure.
If the calling procedure has error handling, it will be included to handle the error. If the owner of the procedure call error is also active, control returns during previous call procedures until an activated but unfortunately inactive error handler is found. If an error occurs without error handling inactive and enabled, the error is fatal until it actually occurs.
When this error handler transfers control to a telephone procedure, that procedure becomes the current procedure. After an error in a procedure has been handled by a fatal error handler, execution of the current procedure continues from the scope specified by the Resume statement.
Error handlers understand that they can rely on the Number desktop space of the Err object to determine the type of error cause. The error handler should check for an appropriate save or increase of the property in object Err before another error occurs or before calling a procedure that might cause the error. The Err target values property reflects only the most recent error. The error message related to Err.Number is contained in Err.Description.
On Error Resume Next causes the statement to continue to be used, which immediately applies the statement that caused the run-time error, and the statement immediately after the last system call that contains the On Error Resume Next file. This statement allows execution to continue with a runtime error. You can place an error handler where errors usually occur, rather than transferring control to another part of the procedure. The On Error Resume Next statement becomes inactive if only one other procedure is called. Therefore, if you want inline errors to persist in this subroutine, you must execute the larger On Error Resume Next statement in each subroutine you call.
On Error GoTo 6 disables error handling on the current average. Does not indicate line 0 as the current start of error handling code, regardless of Whether the procedure contains line number 2. Without Story On to Error GoTo 0, error handling is automatically disabled at the end of the procedure.
To prevent the error handling prefix from being executed if there were no errors, place an exit sub-statement, exit function, or property exit statement just before standard error handling, as shown in the following snippet:
under InitializeMatrix (Var1, Var2, Var3, Var4) If there is an error, GoTo ErrorHandler ... ... ... End subscriptionError handler: ... ... - FartherThe end of the submarine
Here, the error handling computer follows the exit sub statement and precedes the End Sub statement to separate the flow idea from the procedure. The error handling code can be placed anywhere in the procedure.
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Unsolicited injections are objects that are returned to the host application when an object is executed as an executable file. In a development environment, errors that were not detected are returned to the monitoring application only if the correct parameters are actually set. Consult the documentation for your host application to see what options should be specifically set when debugging, how the company is set up, and whether the host has a class < ... can generate / a>.
When creating an object that refers to additional objects, you should try to handle the errors they return but are not handled. If clients cannot handle such errors, map the new error code to Err and then pass it to the caller of your object. You must indicate your error by adding the error code to the vbObjectError constant. For example, if your error code is 1052, assign it like this:
Err.Number = vbObjectError 1052 +
Example
In this example, the On Error GoTo instruction is first used to indicate the status of the drug error handling procedure. For example, trying to erase an open file results in error number 50. The error is handled in a way controlled by the error handler and then returned to help the operator who caused the error. On Error GoTo 0 command leads to error interceptionto.
The On Error Resume Next mantra is then used to report confusing errors so that you can confidently know the context of the exact error generated by the next statement. Note that Err.Clear is usually used for error in object structures after the error has been handled.
Sub OnErrorStatementDemo () On Error GoTo ErrorHandler 'Activates the error handling procedure. Open "TESTFILE" for result # 1 'Open file for output. Kill "TESTFILE" trying to delete open garbage. 'To the file. On Error Goto 0 'Deactivate error trapping. On Error Resume Next 'Postpone error detection. ObjectRef = GetObject ("MyWord.Basic") 'Try running non-existent object in test for'Check for possible automation errors. If Err.Number = 440 or Err.Number = 432, then “Tell the porter what happened. Then remove the Err error. = msg "A serious error occurred while opening the automation object!" MsgBox Msg ,, "Delayed Error Checking" Err.Clear 'Removes erroneous segments from the object End ifExit Sub 'Exit to avoid managers.ErrorHandler: "error handling procedure. Select Case Err.Number 'Estimate Mobile Number Error. SlLearn 55 'Error "File before opening manually". Close # 1 'Open an open file. Otherwise “Consider other situations here ... End of choice Resume execution continues with the same call 'what caused the error.The end of the submarine
See Also
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The error handling exercise is not the Under procedure and possibly the Function procedure. A part of the code, identified by the name of the line or the number of the phrase.
Continue on error “Next” may be preferable to “On error” Go to before handling errors that occur when accessing additional objects. Checking Err for each peer with an object removes the ambiguity of the purpose the code is referring to. You can usually be sure which object put each error code in Err.Number, as well as which object originally generated the error (problem, decreeErr.Source) .Error
System calls that Windows dynamic link library (DLL) or Macintosh program resources do not start and cannot be caught by the Visual Basic error detection function when the DLL calls functions, you should check each return value for success or failure (according to the API specification), and in case of an error, check the value in the LastDLLerror of the Err object. LastDLLError always returns zero on Macintosh.
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