Скачать или смотреть How to Debug Your Script in Delphi Without Runtime Errors: A Step-by-Step Guide

Facing issues while debugging scripts in Delphi? Learn how to solve the "script is already running" error with our detailed guide on using TDelphiWebScript component events.
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This video is based on the question https://stackoverflow.com/q/64138839/ asked by the user 'Adrian De Armas' ( https://stackoverflow.com/u/8760828/ ) and on the answer https://stackoverflow.com/a/64146637/ provided by the user 'Adrian De Armas' ( https://stackoverflow.com/u/8760828/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Overcoming the "Script Already Running" Error in Delphi Debugging

Debugging scripts can be a tricky process, especially when dealing with runtime errors. One common error that many Delphi developers encounter is the "script is already running" message. If you've found yourself stuck with this frustrating issue, you're not alone. Thankfully, there's a solution on the horizon.

Understanding the Problem

In a typical scenario, you might have a script that accepts parameters before execution. When you attempt to debug the script after assigning value to variables, you may encounter the error indicating that the script is already in execution. Here's a quick look at the code that leads to this problem:

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The error occurs because Exec.RunProgram(0); is being executed while you are attempting to debug the script, leading to the runtime error. If you skip the variable assignment before debugging, everything runs smoothly, but this is not an ideal situation for a developer who needs to check variable values as part of the debugging process.

The Solution: Using the OnAfterExecutionStarted Event

To address this issue effectively, the key lies in using TDelphiWebScript component events. Specifically, employing the OnAfterExecutionStarted event will allow you to set variable values without encountering the "script is already running" error.

Steps to Implement the Solution

Modify Your Code:
Instead of setting up your execution and debugging as before, include the assignments for variables in the OnAfterExecutionStarted event.

For example:

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Begin Your Debugging Process:
After you have set your event, you can continue with your debugging as follows:

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Key Points to Remember

Avoid Using OnExecutionStarted: Directly using OnExecutionStarted will lead you back to the error.

Assign Variables After Execution Starts: Moving variable assignments to the OnAfterExecutionStarted event is crucial.

Check Your Event Handling: Make sure your event is correctly linked to the TDelphiWebScript you are working with.

Conclusion

Debugging while maintaining variable state in Delphi scripts can be challenging, but with this approach, you can efficiently avoid runtime errors and streamlining your debugging process. By utilizing the OnAfterExecutionStarted event, you ensure that your script executes without errors, allowing you to thoroughly check your variables while debugging.

Happy debugging!