Home > Intraweb Error > Intraweb Error Handling

Intraweb Error Handling

in this section: Rethinking the User Interface Writing your first Delphi App Images and Graphics Extending Intraweb Working with COM Working with ClientDataSets Creating PDA Applications Error Handling Control Size Reading and writing custom cookies Miscellaneous Advanced Development Session Locking Search Documentation: Error Messages Intraweb will display errormessages resulting from exceptions.These errormessages can be customized using templates.Seeusing templates. Simple error dialog When an IntraWeb application raises an exception, that exception can be caught and the information displayed in a customized manner. In some cases the exception can be displayed without aborting the application. There is a property of the ServerController called "ExceptionDisplayMode" which can be set to smAlert, smSameWindow, SmNewWindow, or smSameWindowFrame. Default issmAlert whichwill displayerrorin a pop up window. Timeouts IntraWebtreats "TimeOut" exceptionsdifferently thanregular exceptions. "TimeOut" exceptions occur when a user tries to access a session which is already terminated (or never existed before). You can get this error by setting IWServerController.SessionTimeOut for a short period of time and leave your application with no activity. Then, if you try toaccess your application, you will end upwith atime-out error. You can catch TimeOut errors byassigningIWServerController.TimeOutURL .This URL will be displayed if a Timout error occurs. Non-recoverable Errors If an exception occurs which prevents a page to completely render (e.g. any exception in IWForm.OnRender) will show Non server-side errors Errors could occur in the WEB browser itself while script code parcing. As this is not an IntraWeb error you can do nothing with it to costomize, but it's useful to configure IE in the way like this: IE | Tools | InternetOptions | Advanced | Show friendly HTTP error messages.

(C) 2002-2009 - Atozed Software Ltd.

If an asynchronous request does not succeed, then by default, the message , no error will be shown. If you have the following event:procedure TIWForm1.IWButton1AsyncClick(Sender: TObject; EventParams: TStringList);begin IWLink1.Caption := DateTimeToStr(now);end; then an asynchronous http://www.atozed.com/intraweb/docs/Develop/CustomizingErrorEtAl.aspx request is sent to your server, when you click on IWButton1. If the session already expired, a temporary connection problem exists etc, then this async request will not succeed. IntraWeb will http://www.atozed.com/intraweb/docs/Develop/Ajax/Errorhandlinganddebugging.aspx silently hide that error condition by default.If you want an error message (alert) to be shown, because you are debugging your application then you may set a global JavaScript DEBUG variable to true. You can do that during the initial rendering of your form for example:procedure TIWForm1.IWAppFormRender(Sender: TObject);begin AddToInitProc('DEBUG=true;');end;This can of course also be done from within any of your custom JavaScript routines.There is also a debugAlert(AMessage) function, which may be used from your own JavaScript code. This will show an alert only if DEBUG==true.

(C) 2002-2009 - Atozed Software Ltd.

Point»IntraWeb Demos»Documentation» Bundled Key Request» FAQ »Articles »Books »Support» Archived Versions What others say »Case Studies »Magazine Reviews »User Quotes Copyright 2002 - 2016 Atozed Computer Software Ltd. Atozed Home»IntraWeb»IntraWeb Blog Indy and IntraWeb - Connection Closed Gracefully Exceptions 9/13/2012 Many http://www.atozedsoftware.com/intraweb/Blog/20120913.EN.aspx Indy users are annoyed by the EIdConnClosedGracefully exception that is raised with Indy servers, especially the HTTP and other servers. EIdConnClosedGracefully is an exception signaling that the connection has been closed by the other side intentionally. This http://delphi.about.com/od/objectpascalide/a/errorexception.htm is not the same as a broken connection which would cause a connection reset error. If the other side has closed the connection and the socket is read or written to, EIdConnClosedGracefully will be raised by Indy. intraweb error This is similar to attempting to read or write to a file that has been closed without your knowledge.In some cases this is a true exception and your code needs to handle it. In other cases (typically servers) this is a normal part of the functioning of the protocol and Indy handles this exception for you. Even though Indy catches it, when running in the IDE the debugger will be triggered first. You can simply intraweb error handling press F9 to continue and Indy will handle the exception, but the constant stopping during debugging can be quite annoying. In the cases where Indy catches the exception, your users will never see an exception in your program unless it is run from the IDE.Simple solutionBecause the EIdConnClosedGracefully is a common exception especially with certain servers it descends from EIdSilentException. On the Language Exceptions tab of Debugger Options (Tools Menu) you can add EIdSilentException to the list of exceptions to ignore. After this is added the exceptions will still occur in the code and be handled, but the debugger will not stop the program to debug them.Is it an error?All exceptions are not errors. Many developers have been taught or assumed that all exceptions are errors. However this is not the case, and this is why they are called exceptions and not errors. Exceptions are exactly that - exceptions. Delphi and C++ Builder use exceptions to handle errors in an elegant way. However exceptions have other uses besides errors as well. EAbort is one example of an exception that is not necessarily an error. Exceptions such as these are used to modify standard program flow and communicate information to a higher calling level where they are trapped. Indy uses exceptions in such a way as well. Why is it an exception?Many users hav

in Delphi Exception Hand… 3 On Reraising Exceptions in Delphi Exception Han… 4 The Dark Side of Application.ProcessMessages… 5 Understanding Delphi Project Files (.DPR) About.com About Tech Delphi Delphi Programming - Inside and Out Handling Errors and Exceptions The most bug-free line of code is the one you don't have to write! Share Pin Tweet Submit Stumble Post Share By Zarko Gajic Delphi Expert By Zarko Gajic Unfortunately, building applications includes coding. Regardless of how carefully you write/debug your program, it will be impossible to imagine every situation that can go wrong. Inexperienced user might, for example, try to open a nonexisting file or input a bad value into a data field.Users make mistakes and we should be prepared to handle/prevent these errors wherever and whenever possible.Errors, Exceptions?An exception is generally an error condition or other event that interrupts normal flow of execution in an application. Whenever an error results from processing a line of code, Delphi creates (raises) an object descendent from TObject called the exception object.Guarded BlocksAn application responds to an exception either by executing some termination code, handling the exception, or both. The way to enable error/exception trapping within a given code, the exception must occur within a guarded block of statements. The general code looks like: try    {guarded block of code} except    on do begin      {exception block-handles SomeException}    end; end; continue reading below our video The Most Popular Camera Apps A try / except statement executes the statements in the guarded block of code. If the statements execute without any exceptions being raised, the exception block is ignored, and control is passed to the statement following the end keyword.Example: ... Zero:=0; try   dummy:= 10 / Zero; except   on EZeroDivide do     MessageDlg('Can not divide by zero!',                 mtError, [mbOK], 0) ; end; ... Protecting ResourcesWhen a section of code acquires a resource, it is often necessary to ensure that the resource is released again (or you might get a memory leak), regardless of whether the code completes normally or is interrupted by an exception. In this case, the syntax uses finally keyword and looks like: {some code to allocate resour

 

intraweb error page

Intraweb Error Page p in this section Rethinking the User Interface Writing your first Delphi App Images and Graphics Extending Intraweb Working with COM Working with ClientDataSets Creating PDA Applications Error Handling Control Size Reading and writing custom cookies Miscellaneous Advanced Development Session Locking Search Documentation Error Messages Intraweb will display errormessages resulting from exceptions These errormessages can be customized using templates Seeusing templates Simple error dialog When an IntraWeb application raises an exception that exception can be caught and the information displayed in a customized manner In some cases the exception can be displayed without aborting the application There

intraweb error loading midas.dll

Intraweb Error Loading Midas dll p here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of million programmers just like you helping each other Join them it only takes a minute Sign up Midas dll error loading midas dll up

intraweb error

Intraweb Error p in this section Rethinking the User Interface Writing your first Delphi App Images and Graphics Extending Intraweb Working with COM Working with ClientDataSets Creating PDA Applications Error Handling Control Size Reading and writing custom cookies Miscellaneous Advanced Development Session Locking Search Documentation Error Messages Intraweb will display errormessages resulting from exceptions These errormessages can be customized using templates Seeusing templates Simple error dialog When an IntraWeb application raises an exception that exception can be caught and the information displayed in a customized manner In some cases the exception can be displayed without aborting the application There is

intraweb error coinitialize

Intraweb Error Coinitialize p for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Ask a Question Ask for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Expand Search Submit Close Search Login Join Today Products BackProducts Gigs Live Careers Vendor Services Groups Website Testing Store Headlines Experts Exchange Questions Coinitialize error on IntraWeb using ADO Want to Advertise Here Solved Coinitialize error on IntraWeb using ADO Posted on - - Delphi Verified Solution Comments Views Last Modified - - When