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Delphi Troubleshooting

Thread Error: The handle is invalid (6)

Symptom:

When developing a Delphi multi-threaded application the following error is generated when a thread object is first created:

Project XXXX.exe raised exception class EThread with message 'Thread Error: The handle is invalid (6)'.

Cause:

The constructor for TThread is not being called.

Remedy:

In the constructor for your thread class include the line:

inherited Create( True );

or

inherited Create( False );

These notes are believed to be correct for Delphi 6, but may apply to other versions as well.