On Error Goto 0 In Classic Asp
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On Error Goto 0 Vbscript
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On Error Goto 0 Vba
Join them; it only takes a minute: Sign up What does the “on error goto 0” and “error resume next” in old ASP mean? up vote 5 down vote favorite I am working with old ASP code and I what does on error goto 0 do am not sure about semantics of on error goto 0 and error resume next construction. Can you recommend me some useful resources or enlight me directly? asp-classic vbscript share|improve this question edited Dec 1 '11 at 20:02 Joel Coehoorn 249k92440662 asked May 13 '09 at 8:12 Jakub Šturc 17.9k196996 add a comment| 5 Answers 5 active oldest votes up vote 4 down vote accepted On error resume next: If there is an exception in the program, just ignore on error goto line it and continue to the next statement. Considered very bad and ugly, and rightly so in my opinion. It's like having a big: try { // your code } catch { // nothing! muhaha } in every method of your code (or worse, around the whole program). On error goto 0: disables any error handler that is defined in the current procedure. It's like having a big try-catch around your code, which gets disabled as soon as its hit this line. For more information, see the MSDN. share|improve this answer edited May 13 '09 at 8:32 answered May 13 '09 at 8:20 Razzie 19.7k104862 2 +1 Yes. I just discovered this: If you use On Error Goto 0 then every other On Error statement in the procedure becomes disabled. That was totally unexpected. I thought that the documentation was saying that only the last executed error handler is disabled. I expected that if the code reaches another error handler that it would be enabled again but it isn't. –authentictech May 9 '14 at 14:54 add a comment| up vote 4 down vote Have a look here: http://www.powerasp.com/content/new/on-error-resume-next.asp share|improve this answer answered May 13 '09 at 8:20 Seb 411 add a comment| up vote 3 down vote on error go to takes the execution code to a specific code book mark defined in the page.this is useful when you want to perform anythi
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Error Goto throws error up vote 1 down vote favorite There are similar questions about On Error Goto x not catching all errors etc, but I've encountered a different problem. My (Classic ASP) page works fine, most of the time. Some users http://stackoverflow.com/questions/856710/what-does-the-on-error-goto-0-and-error-resume-next-in-old-asp-mean/856740 complain of an error on the page, couldn't duplicate yet. I tried error handling but On Error Resume Next does not help me with this situation and On Error Goto causes the page not to work and constantly throw an error (which looks like a 500, but that might be because of handling IIS is doing in background). It happens whether I write Goto 0 or Goto [label] without a difference if the label exists or not. What might be causing this? asp-classic error-handling http://stackoverflow.com/questions/13265598/on-error-goto-throws-error share|improve this question asked Nov 7 '12 at 8:13 JNF 3,01911444 add a comment| 2 Answers 2 active oldest votes up vote 6 down vote accepted On Error GoTo label is not supported in ASP you begin an error trapping block using On Error Resume Next , check Err.Number to see if an error occurred, close the block using On Error GoTo 0. See this doc and this thread share|improve this answer edited Sep 28 '13 at 5:49 answered Nov 7 '12 at 8:36 SearchAndResQ 2,04441223 So, I need to If Err.Number <> 0 after each possible problem. And hope things work if I miss one of those... –JNF Nov 11 '12 at 5:56 1 And remember to clear the Err object after a problem, if you want to carry on and check it again later! –Magnus Smith Jun 26 '14 at 10:20 add a comment| up vote 3 down vote Trying to trap every error using On Error Resume Next is not practical in larger ASP pages. Configure IIS to use a custom error page if a status code 500 is received. Format the following to suit... Set objASPError = Server.GetLastError response.write "Category: " & objASPError.Category & _ "ASPCode: " & objASPError.ASPCode & _ "Number: " & objASPError.Number & _ "ASPDescription: " & objASPError.ASPDescription & _ "Description: " & objASPError.Description & _ "Source: " & objASPError.Source share|improve this answer answered May 20 '13 at 8:43 El Bandito 311 It usually ends up without data for som
a tutorial example on how to use 'On Error GoTo 0' to turn off the error handling flag in a procedure to catch the first runtime error. As http://www.herongyang.com/VBScript/Error-Handling-On-Error-GoTo.html you can see from the previous section, my last VBScript example reported the http://www.powerasp.net/content/new/on-error-resume-next.asp last runtime error, not the first one. If you want to catch the first runtime error is a large section of code, you need to: Enter the "On Error Resume Next" statement in the main code to turn on the error handling flag for the main code. Put that section of code on error into a new subroutine procedure. Enter the "On Error Goto 0" statement in the new procedure to turn off the error handling flag for that procedure. Check the Err.Number property right after calling that procedure. Here is the modified VBScript example to catch the first runtime error in a section of code:
on error gotoRun this modified example code in IE, you will get: There is no error at this time. Before statement: x = 1/0 A runtime error has occurred: Err.Number = 11 Err.Description = Division by zero Err.Source = Microsoft VBScript runtime error What heppened was: When the first runtime error occurred on statement, x = 1/0, in the CodeToBeMonitored() procedure, execution stopped for that procedure, beca
Forums Links DISCUSSIONARCHIVES DISCUSSIONARCHIVES2 DISCUSSIONARCHIVES3 BLOG We didn't realize the site was so popular. Other Stuff How To Use On Error Resume Next Often when using ASP or Active Server Pages with VBScript you will find it necessary to check for errors when you do certain things that may fail and then handle it accordingly. Things like opening a database connection or writing to a text file come to mind. Generally if an error is encountered in your .asp file, the processing of your script stops and an error message is returned to the browser. If you want to continue processing your page even if an error is encountered, include the following line at the beginning of your .asp file: <% On Error Resume Next %> That being said just ignoring errors in your code is not a very good idea. What you really want to do is handle the error in some way. The example below opens a database connection and shows you how to trap a potential error and do whatever you want because of it. In this case we are simply displaying the error. <% ConnectionString = "DBQ=c:\inetpub\wwwroot\mysite\data\mydatabase.mdb;Driver={Microsoft Access Driver (*.mdb)};" '*** This code checks the ConnectionString info you entered and reports back the error code if it is not ok Err.Clear On Error Resume Next Set ConnPasswords = Server.CreateObject("ADODB.Connection") ConnPasswords.Open ConnectionString If Err.Number <> 0 Then Response.Write (Err.Description& "
") Response.Write("This means there is most likely a problem with the" & vbCrLf) Response.Write("""ConnectionString"" info that you specified.
" & vbCrLf) Response.End End If On Error GoTo 0 %> We put the "On Error GoTo 0 at the end because that will essentially end the "on error resume next" That is something you want to do so any later errors in your application do not get ignored without you knowing about it. Below is another example. In this example our application logs user info in a text file when they sign in to a site. We add "On Error Resume Next" here simply so no nasty error message come up if by chance write permissions to the text file do