Behandeln von Fehlern in Visual C++

Gilt für: Access 2013, Office 2013

In COM, most operations return an HRESULT return code that indicates whether a function completed successfully. The #import directive generates wrapper code around each "raw" method or property and checks the returned HRESULT. If the HRESULT indicates failure, the wrapper code throws a COM error by calling _com_issue_errorex() with the HRESULT return code as an argument. COM error objects can be caught in a try-catch block. (For efficiency's sake, catch a reference to a _com_error object.)

Denken Sie daran, dass es sich um ADO-Fehler handelt, die das Ergebnis eines Fehlers bei einem ADO-Vorgang sind. Fehler, die vom zugrunde liegenden Anbieter zurückgegeben werden, werden als Error -Objekte in der Errors -Auflistung des Connection -Objekts angezeigt.

The #import directive only creates error-handling routines for methods and properties declared in the ADO .dll. However, you can take advantage of this same error-handling mechanism by writing your own error-checking macro or inline function. See the topic Visual C++ Extensions for examples.