Activex Error Handling
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Retired content Samples We’re sorry. The content you requested has been removed. You’ll be auto redirected activex error message in 1 second. Programmer's Guide (All Editions) Part 2: What Can You Do With Visual Basic? Programming with Components Programming with Components Handling Run-Time Errors in ActiveX
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Components Handling Run-Time Errors in ActiveX Components Handling Run-Time Errors in ActiveX Components Types of ActiveX Components In-Process and Out-of-Process Servers Working with ActiveX Components Creating a Reference to an Object Using an Object's Properties, Methods, and Events Releasing an ActiveX Component Navigating Object Models Handling Run-Time Errors in ActiveX Components Handling Requests mastercam activex error Pending to an ActiveX Component Using a Component's Visual Interface 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. Visual Basic Concepts Visual Studio 6.0 Handling Run-Time Errors in ActiveX Components Error-handling code is especially important when you're working with ActiveX components, because code from the component is used from within your Visual Basic application. Where possible, you should include code to handle errors that the component may generate. For example, it is good practice to check for the error that occurs if a user unexpectedly closes a component application: Function StartWord() ' Starts Microsoft Word. On Error Goto ErrorTrap ' Declare a Microsoft Word Application variable ' and an integer variable for error trap. Dim wdApp As Word.Application Dim iTries As Integer ' Assign an object reference. Set wdApp = New Word.Application ' Release object variable. Set wdApp
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during operations involving ActiveX controls similar to the way it handles errors during file I/O or during transactions. If an error cannot be naturally https://msdn.microsoft.com/en-us/library/aa241746(v=vs.60).aspx understood and dealt with by the COBOL program by looking at the return value or out-values of a statement, an exception is raised. The system then searches for a http://documentation.microfocus.com/help/topic/com.microfocus.eclipse.infocenter.extendACUSuite/BKITITACTXS021.html USE After EXCEPTION On OBJECT statement in the Declaratives section. If such a statement is found, the search stops, and the error handler is executed. If the program has not been terminated, program execution continues after the statement that raised the error. If no USE After EXCEPTION On OBJECT statement is found, the runtime determines the action. Usually, a message is presented and the program halts. See USE Statement for more information about USE. Parent topic: Using ActiveX Controls and COM Objects Send feedback about this topic
ActiveX proxy raises an ActiveX exception when an EAServer component method raises an exception or an internal error occurs. Visual Basic and http://infocenter.sybase.com/help/topic/com.sybase.help.eas_5.2.easpg/html/easpg/easpg320.htm most other ActiveX scripting tools do not allow you to handle these http://www.javascriptkit.com/javatutors/trycatch.shtml errors inline. Instead, control transfers to an error handler (specified by on error goto in Visual Basic) or to a system-wide error dialog box. To handle proxy errors inline, you must enable inline exception handling as described in “Handling exceptions inline”. Structure of an ActiveX exception In activex error C++, the OLE EXCEPINFO structure describes an ActiveX exception. Different ActiveX-enabled IDEs provide different mechanisms for applications to obtain the EXCEPINFO structure contents. In Visual Basic, exceptions are mapped to the built-in Err object. The exception number maps to Err.Number and the description is available as Err.Description. You can handle exceptions by activating error handling code with On Error activex error handling Goto statement or by checking whether Err.Number is > 0. The proxy type library defines error numbers for client-side errors in the JagORBClientErrNum enumeration and server-side error numbers in the JagORBServerErrNum enumeration. IDL user-defined exceptions are not supported and are mapped to error number 9000. Client error numbers Table 20-1 lists the codes for client-side error numbers defined in the JagORBClientErrNum enumeration: Table 20-1: JagORBClientErrNum error codes Symbolic error code Number Description jagClNonByteArrayErr 8000 Method arguments of type array can only have a base element type of byte. jagClMultiDimArrayErr 8001 Multi-dimensional arrays not supported as an argument to a method. jagClArrayRedimErr 8002 A Fatal Internal Error was encountered while attempting to resize a method argument of type array. jagClArrayProcErr 8003 A Fatal Internal Error was encountered while processing a method argument of type array. jagClArrayEmptyErr 8004 An array of size 0 was passed as parameter to a method. jagClArrayBoundsErr 8005 A Fatal Internal Error was encounterd while attempting to determine the upper bound on a method argument of type array. jagClNotJagComponentErr 8006 The component being inst
JavaScript, has been maturing since the dark ages of Netscape and IE4. No longer are you forced to settle for what the browser throws in your face in an event of a JavaScript error, but instead can take the matter into your own hands. The try/catch/finally statement of JavaScript lets you dip your toes into error prune territory and "reroute" when a JavaScript "exception" is encountered. Along with other defensive coding techniques such as Object detection and the onError event, try/catch/finally adds the ability to navigate around certain errors that in the past would have instantly stopped your script at its tracks. No more! try/catch/finally try/catch/finally are so called exception handling statements in JavaScript. An exception is an error that occurs at runtime due to an illegal operation during execution. Examples of exceptions include trying to reference an undefined variable, or calling a non existent method. This versus syntax errors, which are errors that occur when there is a problem with your JavaScript syntax. Consider the following examples of syntax errors versus exceptions: alert("I am missing a closing parenthesis //syntax error alert(x) //exception assuming "x" isn't defined yet undefinedfunction() //exception try/catch/finally lets you deal with exceptions gracefully. It does not catch syntax errors, however (for those, you need to use the onerror event). Normally whenever the browser runs into an exception somewhere in a JavaScript code, it displays an error message to the user while aborting the execution of the remaining code. You can put a lid on this behaviour and handle the error the way you see fit using try/catch/finally. At its simplest you'd just use try/catch to try and run some code, and in the event of any exceptions, suppress them: try{ undefinedfunction() } catch(e){ //catch and j