//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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