using System.Text;using System;using System.Runtime.InteropServices;class API{    #region   "API函数定义 "    [DllImport("user32.dll ", CharSet = CharSet.Unicode)]    private static extern int SendMessage(int hWnd, int msg, IntPtr wParam, IntPtr lparam);    [DllImport("user32.dll ", CharSet = CharSet.Unicode)]    private static extern int SendMessage(int hWnd, int msg, IntPtr wParam, TVITEM lparam);    [DllImport("user32.dll ")]    public static extern int GetWindowText(int hWnd, StringBuilder lpString, int nMaxCount);    [DllImport("user32.dll ")]    public static extern int EnumChildWindows(int hWndParent, MyCallBack lpfn, StringBuilder value);    [DllImport("user32.dll ")]    public static extern int GetClassNameA(int hwnd, StringBuilder lpClassName, int nMaxCount);    [DllImport("kernel32 ", CharSet = CharSet.Unicode)]    public static extern int CopyMemory(StringBuilder Destination, IntPtr Source, int Length);    [DllImport("kernel32 ", CharSet = CharSet.Unicode)]    public static extern int GlobalAlloc(int wFlags, int dwBytes);    [DllImport("kernel32 ", CharSet = CharSet.Unicode)]    public static extern int GlobalFree(IntPtr hMem);    #endregion    #region   "常量定义 "    private const int TVGN_CARET = 0x00000009;    private const int TVM_SELECTITEM = 0x0000110b;    private const int TVGN_ROOT = 0x00000000;    private const int TVM_GETNEXTITEM = 0x0000110a;    private const int TVIF_TEXT = 0x0001;    private const int TVGN_NEXT = 0x00000001;    private const int TVM_GETITEM = 0x0000110c;    private const int TVGN_CHILD = 0x00000004;    private const int GMEM_FIXED = 0x0000;    #endregion    ///   
     ///   选取TreeView指定项     ///   
     ///    树对象句柄      ///    节点对象句柄      ///   
     
       成功选中返回true   没找到返回false 
          public static bool SelectNode(IntPtr TreeViewHwnd, IntPtr ItemHwnd)    {        int result = SendMessage(TreeViewHwnd.ToInt32(), TVM_SELECTITEM, new IntPtr(TVGN_CARET), ItemHwnd);        if (result == 0)        {            return false;        }        else        {            return true;        }    }    ///   
     ///   获取TreeView根节点     ///   
     ///    树对象句柄      ///   
     
       成功返回根节点句柄   否则返回   0 
          public static IntPtr GetRoot(IntPtr TreeViewHwnd)    {        TVITEM tv = new TVITEM();        IntPtr hStr = Marshal.AllocHGlobal(1024);        tv.hItem = TreeViewHwnd;        tv.mask = TVIF_TEXT;        tv.pszText = hStr;        tv.cchTextMax = 1024;        int result = SendMessage(TreeViewHwnd.ToInt32(), TVM_GETNEXTITEM, new IntPtr(TVGN_ROOT), tv);        Marshal.FreeHGlobal(hStr);        return new IntPtr(result);    }    ///   
     ///   获取同级下一节点句柄     ///   
     ///    树对象句柄      ///    上一项节点句柄      ///   
     
       成功返回下一项节点句柄   否则返回   0 
          public static IntPtr GetNextItem(IntPtr TreeViewHwnd, IntPtr PrevHwnd)    {        int mbHwnd = 0;        mbHwnd = SendMessage(TreeViewHwnd.ToInt32(), TVM_GETNEXTITEM, new IntPtr(TVGN_NEXT), PrevHwnd);        return new IntPtr(mbHwnd);    }    ///   
     ///   获取第一个子节点句柄     ///   
     ///    树对象句柄      ///    父节点句柄      ///   
     
       成功返回第一个子节点句柄   否则返回   0 
          public static IntPtr GetFirstChildItem(IntPtr TreeViewHwnd, IntPtr ParentHwnd)    {        int result = SendMessage(TreeViewHwnd.ToInt32(), TVM_GETNEXTITEM, new IntPtr(TVGN_CHILD), ParentHwnd);        return new IntPtr(result);    }    ///   
     ///   获取指定项文本     ///   
     ///    树对象句柄      ///    节点句柄      ///   
      
          public static string GetItemText(IntPtr TreeViewHwnd, IntPtr ItemHwnd)    {        StringBuilder sb = new StringBuilder(1024);        int hStr = GlobalAlloc(GMEM_FIXED, 1024);        if (hStr > 0)        {            TVITEM tv = new TVITEM();            tv.mask = TVIF_TEXT;            tv.HTreeItem = ItemHwnd.ToInt32();            tv.pszText = new IntPtr(hStr);            tv.cchTextMax = 1023;            int i = SendMessage(TreeViewHwnd.ToInt32(), TVM_GETITEM, IntPtr.Zero, tv);            int iCopy = CopyMemory(sb, new IntPtr(hStr), 1024);            GlobalFree(new IntPtr(hStr));        }        return sb.ToString();    }}///   
 ///   TV_ITEM结构 ///   
 [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]public class 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;    public int HTreeItem;}