On Error Vfp Handling
resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events Community Magazine Forums Blogs Channel 9 Documentation APIs and reference Dev centers Samples Retired content We’re sorry. The content vfp on error resume next you requested has been removed. You’ll be auto redirected in 1 second. Using Visual vfp on error example FoxPro Developing Visual FoxPro Applications Testing and Debugging Applications Testing and Debugging Applications Handling Run-Time Errors Handling Run-Time Errors Handling Run-Time structured error handling in c# Errors Creating Bookmarks and Task List Shortcuts Testing a Project Handling Run-Time Errors Structured Error Handling Debugging Before Bugs Exist Isolating Problems TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. Handling Run-Time Errors Visual Studio .NET 2003 Run-time errors occur after the application starts to execute. Actions that would generate run-time errors include: writing to a file that doesn't exist, attempting to open a table that is already open, trying to select a table that has been closed, encountering a data conflict, dividing a value by zero, and so on. At times, errors occur when users run your application. You can call your own error-handling routine by including ON ERROR. Typically, ON ERROR uses a DO command to run a routine that handles the error, as in: Copy ON ERROR DO My_Error If your application contains no error-handling routines when an error occurs, the application pauses and Visual FoxPro displays an error message with the following options: Cancel If a user chooses Cancel, Visual FoxPro immediately stops running the application and returns control to the system. Ignore If a user chooses Ignore, Visual FoxPro ignores the line that caused the error and continues to the next line in the program. For a complete list and explanation of Visual FoxPro error messages, see Error Messages. Tip Be sure to provide documentation to your users that describes the errors that they might see, and suggests ways in which they can correct errors. The following commands and functions are useful when anticipating and managing run-time errors. To Use Fill an array with error information AERROR( ) Open the Debugger or Trace window DEBUG or SET STEP ON Generate a specific error to test your error handling ERROR Return an error number ERROR( ) Return an executing program line LINENO( ) Return an error message s
UsConsultingConsulting HomeServices & TechnologiesVFP ConversionAzure & Other CloudsEnergy SoftwareContact UsStaffingStaffing HomeLooking for Staff?Looking for Work?Contact UsMagazineMagazine HomeAll IssuesSubscribeMy (Digital) MagazinesWhere is my Magazine?My Subscriber AccountAdvertiseWriteFrameworkFramework HomeGet Started & DocumentationDownloadSupport & ServicesTrainingTraining HomeClassesMentoringState of .NETLunch with CODECode CampsASP.NET MVCDevNet TrainingVFP ConversionVFP Conversion HomeServicesToolsArticlesFox End of LifeContact UsSign in! Advertisement: Structured Error Handling in VFP 8 By Markus Egger Download File Tweet Download File Markus Egger Markus is the founder and https://msdn.microsoft.com/en-us/library/aa975615(v=vs.71).aspx publisher of CODE Magazine and is EPS President and Chief Software Architect. He is also a Microsoft RD (Regional Director) and the one of the longest (if not THE longest) running Microsoft MVP (Most Valuable Professional). Markus is also a renowned speaker and http://www.codemag.com/article/0301072 author.Markus spends most of his time writing production code. Markus’ client list contains some of the world's largest companies, including many on the Fortune 500. He’s worked as a contractor for Microsoft (including the Visual Studio team) and presented at local user groups and major events, such as MS TechEd. Markus has been published extensively including MSDN Magazine, Visual Studio Magazine, his own CODE Magazine, and much more. Markus is a supporter of communities in North America, Europe, and beyond.Markus focuses on development in .NET (Windows, Web, Windows Phone, and WinRT) as well as Android and iOS. He is passionate about overall application architecture, SOA, user interfaces, general development productivity, and building maintainable and reusable systems. In his spare time, Markus is an avid windsurfer, scuba dive
not implement error handling in their applications(allowing VFP's default error handler to prevail)or they will display a simple messagebox containing a few pieces of error http://www.sweetpotatosoftware.com/blog/index.php/2008/11/24/professional-error-handling-for-vfp-applications/ information such as the values returned from Visual FoxPro's Error(), Message() and Lineno() functions. In either case, this type of error handling is usually woefully inadequate. Not onlyare these approachesof little use to the user, it is probably disconcerting (if not a little frightening) to them. The possible end result of these approaches: bugs go unreported, error information on error is not captured, and the user's overall confidence in the application is shaken. A Possible Approach to Error HandlingAt Southwest Fox 2008, I presented a session entitled "Creating a Professional VFP Application from Start to Finish" in which I showed the error handler that I use in a number of applications I have developed. That error handler is presented vfp on error here as one possible approach you can takewhen implementing error handling in your Visual FoxPro applications.There is sure to be room for improvement, but the state informaiton it gathers is pretty extensiveand I've found that most users find the error screen (see screen shots below)to be non-threatening/reassuring when exceptions arise. How to Use the Error HandlerIn order to implement the error handler in your own applications, you'll need the functions and the ON ERROR command thatare in the main.prg of the sample application (provided in the download below). You'll also want to include the issues.scx formin your project and set the MyCompany, MyProduct, MyTechEmailAddress, and MyTechPhoneNumber properties of the issues form with your information. That's about all there is to it. I have included an FLL with the sample, but this is merely used to facilitate the transmittal of the error information via email. If you implement another method of transmission (such as a post to a Web Connection web application), then you needn't include the FLL. To try the error handler out you
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