c#调用API显示内部局域网内的主机

//写这个程序,为了是显示局域网内的主机,然后通过用户点击选中的机器,检查是否该主机上安装有SQLSERVER,是为一个配置程序所写的

//这里提供CODE,给有需要的朋友

//设置DLL必须使用该命名空间

using System.Runtime.InteropServices;

  #region 动态链接库定义

  [DllImport("mpr.dll",CharSet=CharSet.Auto)] private static extern int WNetEnumResource(IntPtr hEnum, ref int lpcCount,IntPtr lpBuffer, ref int lpBufferSize );

  [DllImport("mpr.dll",CharSet=CharSet.Auto)] private static extern int WNetOpenEnum(RESOURCE_SCOPE dwScope,RESOURCE_TYPE dwType,RESOURCE_USAGE dwUsage,[MarshalAs(UnmanagedType.AsAny)][In] Object lpNetResource,out IntPtr lphEnum);

  [DllImport("mpr.dll",CharSet=CharSet.Auto)] private static extern int WNetCloseEnum( IntPtr hEnum );

  #endregion

  #region 定义枚举常量

  public enum RESOURCE_SCOPE

  {

   RESOURCE_CONNECTED = 0x00000001,

   RESOURCE_GLOBALNET = 0x00000002,

   RESOURCE_REMEMBERED = 0x00000003,

   RESOURCE_RECENT= 0x00000004,

   RESOURCE_CONTEXT= 0x00000005

  }

  public enum RESOURCE_TYPE

  {

   RESOURCETYPE_ANY= 0x00000000,

   RESOURCETYPE_DISK= 0x00000001,

   RESOURCETYPE_PRINT = 0x00000002,

   RESOURCETYPE_RESERVED = 0x00000008,

  }

  public enum RESOURCE_USAGE

  {

   RESOURCEUSAGE_CONNECTABLE =0x00000001,

   RESOURCEUSAGE_CONTAINER=0x00000002,

   RESOURCEUSAGE_NOLOCALDEVICE =0x00000004,

   RESOURCEUSAGE_SIBLING=0x00000008,

   RESOURCEUSAGE_ATTACHED=0x00000010,

   RESOURCEUSAGE_ALL =(RESOURCEUSAGE_CONNECTABLE | RESOURCEUSAGE_CONTAINER | RESOURCEUSAGE_ATTACHED),

  }

  public enum RESOURCE_DISPLAYTYPE

  {

   RESOURCEDISPLAYTYPE_GENERIC= 0x00000000,

   RESOURCEDISPLAYTYPE_DOMAIN= 0x00000001,

   RESOURCEDISPLAYTYPE_SERVER= 0x00000002,

   RESOURCEDISPLAYTYPE_SHARE= 0x00000003,

   RESOURCEDISPLAYTYPE_FILE = 0x00000004,

   RESOURCEDISPLAYTYPE_GROUP= 0x00000005,

   RESOURCEDISPLAYTYPE_NETWORK= 0x00000006,

   RESOURCEDISPLAYTYPE_ROOT = 0x00000007,

   RESOURCEDISPLAYTYPE_SHAREADMIN = 0x00000008,

   RESOURCEDISPLAYTYPE_DIRECTORY = 0x00000009,

   RESOURCEDISPLAYTYPE_TREE = 0x0000000A,

   RESOURCEDISPLAYTYPE_NDSCONTAINER = 0x0000000B

  }

  public struct NETRESOURCE

  {

   public RESOURCE_SCOPE dwScope;

   public RESOURCE_TYPE dwType;

   public RESOURCE_DISPLAYTYPE dwDisplayType;

   public RESOURCE_USAGE dwUsage;

   [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)] public string lpLocalName;

   [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)] public string lpRemoteName;

   [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)] public string lpComment;

   [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)] public string lpProvider;

  }

  public enum NERR

  {

   NERR_Success = 0,/* Success */

   ERROR_MORE_DATA = 234, // dderror

   ERROR_NO_BROWSER_SERVERS_FOUND = 6118,

   ERROR_INVALID_LEVEL = 124,

   ERROR_ACCESS_DENIED = 5,

   ERROR_INVALID_PARAMETER = 87,

   ERROR_NOT_ENOUGH_MEMORY = 8,

   ERROR_NETWORK_BUSY = 54,

   ERROR_BAD_NETPATH = 53,

   ERROR_NO_NETWORK = 1222,

   ERROR_INVALID_HANDLE_STATE = 1609,

   ERROR_EXTENDED_ERROR= 1208

  }

  #endregion

  #region 开始列举网络函数

  public TreeNode pNode1;

  public TreeNode pNode2;

  public TreeNode pNode3;

  private void WNETOE(Object o)

  {

   int iRet;

   IntPtr ptrHandle = new IntPtr();

   try

   {

    iRet =WNetOpenEnum(RESOURCE_SCOPE.RESOURCE_GLOBALNET,RESOURCE_TYPE.RESOURCETYPE_ANY,RESOURCE_USAGE.RESOURCEUSAGE_ALL,o,out ptrHandle );

    if( iRet != 0 )return;

    int entries;

    int buffer = 16384;

    IntPtr ptrBuffer = Marshal.AllocHGlobal(buffer);

    NETRESOURCE nr;

   

    for(;;)

    {

     entries = -1;

     buffer = 16384;

     iRet =WNetEnumResource(ptrHandle,ref entries,ptrBuffer,ref buffer);

     if((iRet != 0) || (entries<1))break;

     Int32 ptr = ptrBuffer.ToInt32();

     for(int i=0;i<entries;i++ )

     {

      nr = (NETRESOURCE)Marshal.PtrToStructure( new IntPtr(ptr), typeof(NETRESOURCE) );

      if(RESOURCE_USAGE.RESOURCEUSAGE_CONTAINER == (nr.dwUsage & RESOURCE_USAGE.RESOURCEUSAGE_CONTAINER))

      {

      

       ptr += Marshal.SizeOf( nr );

       if(nr.dwDisplayType == RESOURCE_DISPLAYTYPE.RESOURCEDISPLAYTYPE_NETWORK)

       {

        pNode1 = tView.Nodes.Add(nr.lpRemoteName);//TreeView

        pNode1.ImageIndex = 0;

        pNode1.SelectedImageIndex = 0;

       }

       else if(nr.dwDisplayType == RESOURCE_DISPLAYTYPE.RESOURCEDISPLAYTYPE_DOMAIN)

       {

        pNode2 = pNode1.Nodes.Add(nr.lpRemoteName);

        pNode2.ImageIndex = 1;

        pNode2.SelectedImageIndex =1;

       }

       else if(nr.dwDisplayType == RESOURCE_DISPLAYTYPE.RESOURCEDISPLAYTYPE_SERVER)

       {

        string sPCName = nr.lpRemoteName;

        pNode3 = pNode2.Nodes.Add(sPCName.Substring(2,sPCName.Length-2));\\此处为去处机器名称前的两个"\\"字符

        pNode3.ImageIndex = 2;

        pNode3.SelectedImageIndex = 2;

       }

       WNETOE(nr);

      }

     

     }

    }

    Marshal.FreeHGlobal( ptrBuffer );

    iRet =WNetCloseEnum( ptrHandle );

   }

   catch(Exception ex)

   {

    MessageBox.Show("查找本地网络错误:"+ex.Message,"错误",MessageBoxButtons.OK,MessageBoxIcon.Error);

   }

  }

  #endregion

  //窗体LOAD事件中,使用函数

  private void frmDBConnConfig_Load(object sender, System.EventArgs e)

  {

   WNETOE(null);

  }
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