Asp On Error Resume Next Vbscript
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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 on error resume next vbscript example when using ASP or Active Server Pages with VBScript you will find it necessary
On Error Resume Next Vbscript Function
to check for errors when you do certain things that may fail and then handle it accordingly. Things like opening a database
On Error Resume Next Vbscript W3schools
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.
Vbscript On Error Resume Next Not Working
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 vbscript on error resume next turn off 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 not exist. <% Set ObjMyFile = CreateObject("Scripting.FileSystemObject") Err.Clear On Error Resume Next LogFileName = "aspprotect.log" LogFileDirectory =
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provides a tutorial example on how to use the 'On Error Resume Next' statement to turn on error handling flag. You can use Err.Number > 0 to test if there is any runtime error has been raised or not. We have seen what happens when the error handling flag is turned off in the previous section. Now let's see how the "On Error Resume Next" statement should be used: By default, the error handling flag is turned off. You can turn on the error handling flag at time your want by entering the "On Error Resume Next" statement. Once the error handling flag is turned on, execution will not be stopped when a runtime error occurs. You can use the condition of (Err.Number>0) to determine a runtime error has occurred or not. If a runtime error has occurred, use Err object properties to get more information about the error: Err.Number - "Err" object property containing the error code. Err.Description - "Err" object property containing the error description. Err.Source - "Err" object property containing error source identification. I have modified the VBScript example used in the previous section to try to check the "Err" object by myself with the error handling flag turned on:
Run this example code in IE, you will get: There is no error at this time. Before statement: x = 1/0 Before statement: y = CInt(777777) Before statement: z = 1 + "2nd" End of test A runtime error has occurred: Err.Number = 13 Err.Description = Type mismatch Err.Source = Microsoft VBScript runtime error The output confirms that: When CheckError() was called at the beginning, Err.Number is 0, indicating that there is no runtime error. When the first runtime error occurred on statement, x = 1/0, execution continued because the err