Problem with TVM_GETITEM

[suguimoto]

Hello! I can´t make SendMessage work with TVM_GETITEM! I returns garbage always =/ This program is supposed to read a item´s name from a TreeView! Here is the code: public const int TV_FIRST = 0x1100; public enum TV_Messages { TVM_GETNEXTITEM = (TV_FIRST + 10), TVM_GETITEM = (TV_FIRST + 12), //62 TVM_GETCOUNT = (TV_FIRST + 5), TVM_SELECTITEM = (TV_FIRST + 11), TVM_DELETEITEM = (TV_FIRST + 1), TVM_EXPAND = (TV_FIRST + 2), TVM_GETITEMRECT = (TV_FIRST + 4), TVM_GETINDENT = (TV_FIRST + 6), TVM_SETINDENT = (TV_FIRST + 7), TVM_GETIMAGELIST = (TV_FIRST + 8), TVM_SETIMAGELIST = (TV_FIRST + 9), TVM_GETISEARCHSTRING = (TV_FIRST + 64), TVM_HITTEST = (TV_FIRST + 17), } public const int TVIF_TEXT = 0x0001; public const int TVIF_PARAM = 0x4; [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] public struct TVITEM { public int mask; public IntPtr hItem; public int state; public int stateMask; public IntPtr pszText; public int cchTextMax; public int iImage; public int iSelectedImage; public int cChildren; public IntPtr lParam; } private void button1_Click(object sender, EventArgs e) { TVITEM tvItem = new TVITEM(); tvItem.hItem = (IntPtr)Int32.Parse(textBox1.Text); tvItem.cchTextMax = 512; tvItem.mask = TVIF_TEXT; tvItem.pszText = Marshal.AllocHGlobal(512); IntPtr ptrTvi = Marshal.AllocHGlobal(Marshal.SizeOf(tvItem)); Marshal.StructureToPtr(tvItem, ptrTvi, false); SendMessage(TreeHandle, (int)TV_Messages.TVM_GETITEM, IntPtr.Zero, ptrTvi); // TreeHandle got from FindWindow and FindWindowEx string text = Marshal.PtrToStringAuto(tvItem.pszText); MessageBox.Show(text); Marshal.FreeHGlobal(tvItem.pszText); Marshal.FreeHGlobal(ptrTvi); } } If anyone got any idea, please help me! Thanks!