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Delphi 2007 - Error creating form: Failed to set data for...

The error message like this - "Error creating form: Failed to set data for..." appears on IDE CodeGear Delphi 2007 startup.
This situation occurs due to lack of access rights.
A simple and obvious half-measure is to run IDE CodeGear Delphi 2007 with administrator rights.
For example - check "Run this program as an administrator" in the "Compatibility" tab in Properties menu.

Monkeypatch to remove "UserWarning: pkg_resources is deprecated as an API" in Python

Anyone who meets similar only annoying "UserWarning: pkg_resources is deprecated as an API",
can solve it using the next commands in Windows Command Prompt or Windows Powershell:

uninstall setuptools
pip uninstall setuptools
reinstall the version which don't have these deprecated warnings.
pip install setuptools==66.1.1
or
pip install setuptools==69.0.2

Version of setuptools which has the deprecated warning: v67.3.0

Delphi gives when starting "Socket error # 10038 Socket operation on non-socket"

"Socket error # 10038 Socket operation on non-socket" is a wide-spread error.

Next messages are "Access violation at address 205B90EA in module 'coreide270.bpl'. Read of address 00000000,", "Access violation at address 5005F8F4 in module 'rt1270.bpl. Read of address 00000000."
This erroneous behavior was noticed in Delphi RAD Studio 10.4 (10.4.1, 10.4.2).
Confirmed to work in Delphi 11.0 as well, with the obvious adjusts for version:

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One can try these steps to fix Delphi 10.4:

1. Shut the Delphi IDE down.
2. Run Regedit.
3. Go to the branch HKEY_CURRENT_USER\SOFTWARE\Embarcadero\BDS\21.0\KnownIDE Packages
4. Find the value with name $(BDS)\Bin\LivePreview270.bpl and change the data from "Embarcadero FireUI Live Preview Package" to "_Embarcadero FireUI Live Preview Package" just adding one or two underscores in the beginning. Other symbols, for instance, I tried to put "#" will not fit, the erroneous behavior will not be fixed.
5. Restart the Delphi IDE.

This is suitable for Delphi 11 as well, the branch in the system registry is HKEY_CURRENT_USER\SOFTWARE\Embarcadero\BDS\22.0\Known IDE Packages and value name $(BDS)\Bin\LivePreview280.bpl, value data to change is Embarcadero FireUI Live Preview Package

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If one get these errors when starting up Delphi RAD Studio, one will have to do these operations every time one reinstall, add "Additional Options", etc.

PostMessage vs. SendMessage

What is the difference between PostMessage and SendMessage?

PostMessage is asynchronous, sends a message in the message queue associated with the thread and returns without waiting for the thread to process that messaage.
SendMessage is synchronous, calls the window procedure for the specified window and does not return until the window procedure has processed the message.