How to Handle Clipboard-Copy-Paste (Low-Level)

To handle clipboard operations in X11, Win32, and Cocoa systems, create appropriate atoms, open the clipboard, and convert data between formats.

X11 uses XInternAtom to create atoms like UTF8_STRING and CLIPBOARD, enabling selection and data retrieval via XConvertSelection and XGetWindowProperty.

In Win32, clipboard operations involve opening with OpenClipboard, fetching data with GetClipboardData, and handling potential NULL pointers before converting to UTF8.

Cocoa clipboard operations require setting datatypes, accessing the pasteboard, and converting strings as necessary, ensuring data integrity during the process.

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