How does the draggable crosshair in Process Explorer work?

StackOverflow https://stackoverflow.com/questions/714205

  •  23-08-2019
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Question

There is a feature in Sysinternal's Process Explorer that allows a crosshair to be dragged from the application to a control in any other application you are running and highlights said control.

Does anyone know how this was achieved or if there is a .NET/C++ library out there that can be reused?

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Solution

Using Win32 API

  • GetCursorPos: to get the cursor position (maybe .NET has its own function to do that)
  • WindowFromPoint: to get the handle of the window from a specific point in the screen

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