First use
EM_GETSEL
to retrieve the character indices of the begin and end of the current selection.
For edit controls with small amounts of text you can use the window message
WM_GETTEXT to retrieve the entire window text and select the appropriate part of it.
For multi-line edit controls with huge amounts of text, this method can be inefficient. In that case you can use
EM_GETHANDLE
to get the memory handle of the buffer that the edit control uses. Use
LocalLock to get a memory pointer to that buffer. Then you can access that buffer directly and retrieve the select text by using the character indices that EM_GETSEL has returned.
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