Reading from a text field in another application's window

Question

Is there a way for a Windows application to access another applications data, more specifically a text input field in GUI, and grab the text there for processing in our own

Answer 1

Look at AutoHotkey. If you need an API for your application, look at their sources. To prevent it, use a custom widget instead of WinForms, MFC or Win32 API. That is not foolproof, but helps.