原文地址：http://blog.51cto.com/qsjming/807445

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

看雪上某人发表的，貌似其它都可以改，就是dns有些问题，研究后发现，原来是类型有问题，改了后正常运行了

//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; 
} 
 
 
 
//读取注册表取得适配器名称  
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 ) // 判断是不是以太网卡  
                {              
                   dwBufSize = 256; 
                        if( ::RegQueryValueEx( hSubKey, "DriverDesc", 0, &dwDataType, szData, &dwBufSize ) == ERROR_SUCCESS ) 
                         {     
                     // szData 中便是适配器详细描述  
                      dwBufSize = 256; 
                            if( ::RegQueryValueEx( hSubKey, "NetCfgInstanceID", 0, &dwDataType, szData, &dwBufSize ) == ERROR_SUCCESS )  
                      {   
                        //szData中便是适配器名称   
                         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数据需要在后面再加个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; 
} 
 
 
 
//未公开函数DhcpNotifyConfigChange位于 dhcpcsvc.dll中.  
//原型声明 
typedef BOOL ( CALLBACK* DHCPNOTIFYPROC) ( 
      LPWSTR lpwszServerName,      // 本地机器为NULL 
      LPWSTR lpwszAdapterName,   // 适配器名称 
      BOOL bNewIpAddress,         // TRUE表示更改IP 
      DWORD dwIpIndex,         // 指明第几个IP地址，如果只有该接口只有一个IP地址则为0 
      DWORD dwIpAddress,         // IP地址 
      DWORD dwSubNetMask,         // 子网掩码 
      int nDhcpAction            // 对DHCP的操作 0:不修改, 1:启用 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; 
}