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Win SendMessage

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Win SendMessage

Parameters: Target hWnd, Message, wParam, lParam

Sends the specified message (WM_USER or WM_COPYDAT) to a window specified by the hWnd handle.


  • Target hWnd - identifier of the window (HWDN) to which a message should be sent;
  • Message - sent message. There are only two variants possible - WM_USER and WM_COPYDATA;
  • wParam - value written to wParam when the WM_USER message is passed (number).
  • lParam/lpData
    • For the WM_USER message - value written to lParam;
    • For the WM_COPYDATA message - string written to lpData of the COPYDATASTRUCT structure.

For more information about using this action review the Send Message, WinAPI topic in the "Creating Addons and Advanced Integration" section.

All topics in the "Miscellaneous" section: