CopyDataHelper.cs

using System;
using System.Runtime.InteropServices;

namespace zbutt
{
	public struct COPYDATASTRUCT
	{
		public int dwData;
		public int cbData;
		public IntPtr lpData;
	}
	/// <summary>
	/// Summary description for CopyDataHelper.
	/// </summary>
	class CopyDataHelper
	{
		const int LMEM_FIXED = 0x0000;
		const int LMEM_ZEROINIT = 0x0040;
		const int LPTR = (LMEM_FIXED | LMEM_ZEROINIT);
		const int WM_COPYDATA = 0x004A;

 
		[DllImport("kernel32.dll")]
		public static extern IntPtr LocalAlloc(int flag, int size);
		[DllImport("kernel32.dll")]
		public static extern IntPtr LocalFree(IntPtr p);
		[DllImport("user32.dll")]
		public static extern int SendMessage(IntPtr
			hWnd, int Msg, IntPtr wParam, IntPtr lParam);

		//Create wrappers for the memory API's similar to
		//Marshal.AllocHGlobal and Marshal.FreeHGlobal
 
		public static IntPtr AllocHGlobal(int cb) 
		{
			IntPtr hMemory = new IntPtr();
			hMemory = LocalAlloc(LPTR, cb);
			return hMemory;
		}
 
		public static void FreeHGlobal(IntPtr hMemory) 
		{
			if (hMemory != IntPtr.Zero) 
				LocalFree(hMemory);
		}
 
		public static void SendMsgString(IntPtr hWndDest, string sScript )
		{
			COPYDATASTRUCT oCDS = new COPYDATASTRUCT();
			oCDS.cbData = (sScript.Length + 1) * 2;
			oCDS.lpData = LocalAlloc(0x40, oCDS.cbData);
			Marshal.Copy(sScript.ToCharArray(), 0, oCDS.lpData, sScript.Length);
			oCDS.dwData =  1;
			IntPtr lParam = AllocHGlobal(oCDS.cbData);
			Marshal.StructureToPtr(oCDS,lParam,false);
			SendMessage(hWndDest,WM_COPYDATA,IntPtr.Zero,lParam);
			LocalFree(oCDS.lpData);
			FreeHGlobal(lParam);
		}
 
		public static string GetMsgString(IntPtr lParam)
		{
			COPYDATASTRUCT st = (COPYDATASTRUCT) Marshal.PtrToStructure(lParam,
				typeof(COPYDATASTRUCT));
			string str = Marshal.PtrToStringUni(st.lpData);
			return str;
		}
	}
}