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What Is The OnException Event in DelphiVCL.Application?


The OnException or DelphiVCL.Application.OnException event occurs when an unhandled exception occurs in the application. This is a fundamental error event to understand when you develop Windows software.

How is the DelphiVCL.Application.OnException event used?

Use OnException to change the default behavior that occurs when an exception (a critical error) is not handled by regular application code. The OnException event handler is called automatically in the HandleException method.

OnException only handles exceptions that occur during message processing. Exceptions that occur before or after the execution of the application’s Run method do not generate OnException events.

Let’s take a look at all of DelphiVCL.Application.OnException properties and methods:

See the responses in our Windows command prompt:


You can also read short information about the DelphiVCL.Application.OnException using the print() command:

See the responses in our Windows command prompt:



Check out DelphiVCL which easily allows you to build GUIs for Windows using Python.

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