c#调用API显示内部局域网内的主机

王朝c#·作者佚名  2006-01-10
窄屏简体版  字體: |||超大  

//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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