sendmessage in C#

1	[DllImport("user32.dll", SetLastError = true)]
2	static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
3
4	[DllImport("user32.dll", SetLastError = true)]
5	static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
6
7	[DllImport("user32.dll")]
8	private static extern bool PostMessage(IntPtr hWnd, UInt32 Msg, Int32 wParam, Int32 lParam);
9
10	static void Main(string[] args)
11	{
12	// Use this to send key strokes
13	const int WM_KEYDOWN = 0x100;
14	IntPtr windowHandle = FindWindow("NOTEPAD", null);
15	IntPtr editHandle = FindWindowEx(windowHandle, IntPtr.Zero, "EDIT", null);
16	PostMessage(editHandle, WM_KEYDOWN, 'A', 0);
17	Console.ReadKey();
18	}

1	[DllImport("user32.dll")]
2	public static extern int SendMessage(int hWnd, int msg, int wParam, [MarshalAs(UnmanagedType.LPStr)] string lParam);
3
4	[DllImport("user32.dll", SetLastError = true)]
5	static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
6
7	[DllImport("user32.dll", SetLastError = true)]
8	static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
9
10	static void Main(string[] args)
11	{
12	const int WM_SETTEXT = 0x0C;
13
14	IntPtr windowHandle = FindWindow("NOTEPAD", null);
15	IntPtr editHandle = FindWindowEx(windowHandle, IntPtr.Zero, "EDIT", null);
16	string textToSendToFile = "Input here your text";
17	SendMessage((int)editHandle, WM_SETTEXT, 0, textToSendToFile);
18
19	Console.ReadKey();
20	}

출처 : http://social.msdn.microsoft.com/Forums/ko-KR/csharplanguage/thread/eebaa35b-f22c-47b2-9fc9-2a5e876f0b79