David Heffernan

Encryption is agnostic of framework. I don't see how you could have a VCL only encryption library. You don't need design time components.

Component vendor is wrong.

Timers are for GUIs. MsgWaitForMultipleObjects is one sound way to implement a message pump on a thread that needs to do tasks periodically.

No you won't. There are plenty of timer free solutions I would expect. Very hard to give advice without context. And very hard to explain why messages are missing with only a partial extract of code. Anyway, good luck.

A complete repro is probably necessary here. A timer seems needless. Just keep track of the time when you last flushed and do it again once a second has elapsed.

You reap what you sow. Don't create multiple variables with the same name.

Don't think that's true. That's the point of the broadcast message. The shell updates its environment and uses that when creating new processes.

Did you do any debugging? Did you check that the registry was modified as intended? Reference back to https://docs.microsoft.com/en-gb/windows/win32/procthread/environment-variables

You code runs the risk of hanging when it broadcasts. But the basic concept is correct albeit poorly implemented. Have you done any debugging?

The answer in that link appears factually misleading at best, probably downright incorrect.

Provide a minimal complete reproduction.

This approach is what you take when you hate your users. They can't tell whether or not your program is stuck in a non terminating loop, and the OS asks if you want to terminate the program. So only do this if you want to make your users suffer.

Don't change libraries and hope. The library you use is known to work well. There's a defect in your code. Work out what it is. Trial and error never works out. Provide a minimal yet complete program ideally a console app. Then you can hope for some help.

Why would that be odd? That's pretty much a canonical use of try finally.

Jokes aside, any user that feels that the testing could be broadened can write some tests and submit a PR.