I'll offer a solution but you are going to need access to the application's code that you are trying to send the message to. M_hWndEdit = hWnd // Store the handle to notepads edit window (this is the window we want to send the messages to) return false Search for notepads edit window - if we find it 'false' is returned (means stop enumerating windows)

Static bool EnumChildWindowsCallback( IntPtr hWnd, IntPtr lParam) ) // I decided to use the clipboard: // Copy some text to the clipboard Now you could use different messages to send text (WM_CHAR, WM_KEYDOWN. If (m_hWndEdit != null) // edit window found? But! we can not send text to the main-window, we have to find the subwindow where the text is entered // So lets enumerate all child windows: IntPtr hWndEdit = IntPtr.Zero ĮnumChildWindows(hWnd, EnumChildWindowsCallback, hWndEdit) so lets have a look if we find an opened notepad window (better you open one first.) IntPtr hWnd = FindWindow( ' Notepad', null) for a test we use the notepad window //. Static extern int GetClassName( IntPtr hWnd, StringBuilder lpClassName, int nMaxCount) Static extern bool EnumChildWindows( IntPtr hwndParent, EnumWindowsProc lpEnumFunc, IntPtr lParam) Static extern IntPtr FindWindow( string lpClassName, string lpWindowName) Static extern IntPtr SendMessage( IntPtr hWnd, uint Msg, uint wParam, uint lParam) Delegate bool EnumWindowsProc( IntPtr hWnd, IntPtr lParam)

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