vc下不重啓改ip、網關、dns

原文地址：http://hi.baidu.com/9908006/blog/item/bed174998952a8186f068c3e.html

看雪上某人發表的，貌似其它都可以改，就是dns有些問題，研究後發現，原來是類型有問題，改了後正常運行了

//VC-ConsoleWithApi
#include <windows.h>
#include <string>

#include <iostream>
#pragma comment(lib,"Ws2_32.lib")
using namespace std;
void GetLanAdapterName( char* szLanAdapterName );
BOOL RegIP( LPCTSTR lpszAdapterName, LPCTSTR pIPAddress, LPCTSTR pNetMask, LPCTSTR pNetGate,  LPCTSTR pDNSServer1,  LPCTSTR pDNSServer2 );
BOOL NotifyIPChange( LPCTSTR lpszAdapterName, int nIndex, LPCTSTR pIPAddress, LPCTSTR pNetMask );

int main()
{

   char AdapterName[ MAX_PATH ] ="";

    GetLanAdapterName( AdapterName );

    RegIP( AdapterName, "172.20.10.252","255.255.255.0", "172.20.10.1", "211.136.17.107", "211.136.18.171" );

    NotifyIPChange( AdapterName, 0, "172.20.10.252",  "172.20.10.1" );


   return 0;
}



//讀取註冊表取得適配器名稱
void GetLanAdapterName(char* szLanAdapterName)
{
   HKEY hKey, hSubKey, hNdiIntKey;
    if( ::RegOpenKeyEx( HKEY_LOCAL_MACHINE, "System\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}", 0, KEY_READ, &hKey ) != ERROR_SUCCESS )
        return;
    DWORD dwIndex = 0;
    DWORD dwBufSize = 256;
    DWORD dwDataType;
    char szSubKey[256];
     unsigned char szData[256];
    while( ::RegEnumKeyEx( hKey, dwIndex++, szSubKey, &dwBufSize, NULL, NULL, NULL, NULL ) == ERROR_SUCCESS )
     {
      if( ::RegOpenKeyEx( hKey, szSubKey, 0, KEY_READ, &hSubKey ) == ERROR_SUCCESS )
         {
         if( ::RegOpenKeyEx( hSubKey, "Ndi\\Interfaces", 0, KEY_READ, &hNdiIntKey ) == ERROR_SUCCESS )
          {
             dwBufSize = 256;
                if( ::RegQueryValueEx( hNdiIntKey, "LowerRange", 0, &dwDataType, szData, &dwBufSize ) == ERROR_SUCCESS )
                 {
                    if( strcmp( (char*)szData, "ethernet" ) == 0 ) // 判斷是不是以太網卡
                {
                   dwBufSize = 256;
                        if( ::RegQueryValueEx( hSubKey, "DriverDesc", 0, &dwDataType, szData, &dwBufSize ) == ERROR_SUCCESS )
                         {
                     // szData 中便是適配器詳細描述
                      dwBufSize = 256;
                            if( ::RegQueryValueEx( hSubKey, "NetCfgInstanceID", 0, &dwDataType, szData, &dwBufSize ) == ERROR_SUCCESS )
                      {
                        //szData中便是適配器名稱
                         strcpy( szLanAdapterName, (const char *)szData );
                        break;
                             }
                         }
                     }
                }
                 ::RegCloseKey( hNdiIntKey );
             }
          ::RegCloseKey(hSubKey);
         }
       dwBufSize = 256;
     }
   /* end of while */

    ::RegCloseKey(hKey);
}


BOOL RegIP( LPCTSTR lpszAdapterName, LPCTSTR pIPAddress, LPCTSTR pNetMask, LPCTSTR pNetGate,  LPCTSTR pDNSServer1,  LPCTSTR pDNSServer2 )
{
   HKEY hKey;
    string strKeyName = "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces\\";
    strKeyName += lpszAdapterName;
   if( ::RegOpenKeyEx( HKEY_LOCAL_MACHINE, strKeyName.c_str(), 0, KEY_WRITE, &hKey ) != ERROR_SUCCESS )
      return FALSE;

    string DNSServer = pDNSServer1;
    DNSServer += ",";
    DNSServer += pDNSServer2;

   char mszIPAddress[ 100 ];
   char mszNetMask[ 100 ];
   char mszNetGate[ 100 ];
   char mszDNSServer[ 100 ];


    strncpy( mszIPAddress, pIPAddress, 98 );
    strncpy( mszNetMask, pNetMask, 98 );
    strncpy( mszNetGate, pNetGate, 98 );
    strncpy( mszDNSServer, DNSServer.c_str(), 98 );

   int nIP, nMask, nGate, nDNSServer;

    nIP = strlen( mszIPAddress );
    nMask = strlen( mszNetMask );
    nGate = strlen( mszNetGate );
    nDNSServer = strlen( mszDNSServer );

    *( mszIPAddress + nIP + 1 ) = 0x00; // REG_MULTI_SZ數據需要在後面再加個0
    nIP += 2;

    *( mszNetMask + nMask + 1 ) = 0x00;
    nMask += 2;

    *( mszNetGate + nGate + 1 ) = 0x00;
    nGate += 2;

    *( mszDNSServer + nDNSServer + 1 ) = 0x00;
    nGate += 2;


    ::RegSetValueEx( hKey, "IPAddress", 0, REG_MULTI_SZ, (unsigned char*)mszIPAddress, nIP );
    ::RegSetValueEx( hKey, "SubnetMask", 0, REG_MULTI_SZ, (unsigned char*)mszNetMask, nMask );
    ::RegSetValueEx( hKey, "DefaultGateway", 0, REG_MULTI_SZ, (unsigned char*)mszNetGate, nGate );
    ::RegSetValueEx( hKey, "NameServer", 0, REG_SZ, (unsigned char*)mszDNSServer, nDNSServer );

    ::RegCloseKey(hKey);

   return TRUE;
}



//未公開函數DhcpNotifyConfigChange位於 dhcpcsvc.dll中.
//原型聲明
typedef BOOL ( CALLBACK* DHCPNOTIFYPROC) (
      LPWSTR lpwszServerName,      // 本地機器爲NULL
      LPWSTR lpwszAdapterName,   // 適配器名稱
      BOOL bNewIpAddress,         // TRUE表示更改IP
      DWORD dwIpIndex,         // 指明第幾個IP地址，如果只有該接口只有一個IP地址則爲0
      DWORD dwIpAddress,         // IP地址
      DWORD dwSubNetMask,         // 子網掩碼
      int nDhcpAction            // 對DHCP的操作 0:不修改, 1:啓用 DHCP，2:禁用 DHCP
);


BOOL NotifyIPChange( LPCTSTR lpszAdapterName, int nIndex, LPCTSTR pIPAddress, LPCTSTR pNetMask )
{
   BOOL bResult = FALSE;
   HINSTANCE hDhcpDll;
    DHCPNOTIFYPROC pDhcpNotifyProc;
   WCHAR wcAdapterName[256];

    MultiByteToWideChar( CP_ACP, 0, lpszAdapterName, -1, wcAdapterName,256 );

   if( ( hDhcpDll = ::LoadLibrary("dhcpcsvc.dll") ) == NULL )
      return FALSE;

   if( ( pDhcpNotifyProc = (DHCPNOTIFYPROC)::GetProcAddress( hDhcpDll, "DhcpNotifyConfigChange" ) ) != NULL )
      if(   (pDhcpNotifyProc)(NULL, wcAdapterName, TRUE, nIndex, inet_addr(pIPAddress), inet_addr(pNetMask), 0 ) == ERROR_SUCCESS )
          bResult = TRUE;

    ::FreeLibrary(hDhcpDll);
   return bResult;
}