C++实现获取IP、子网掩码、网关、DNS等本机网络参数的方法

#pragma comment(lib,"Ws2_32.lib")#include <Iphlpapi.h>#pragma comment(lib, "Iphlpapi.lib")using namespace std;typedef struct tagNetworkCfg { char szIP[18]; char szNetmask[18]; char szGateway[18]; char szDns1[18]; char szDns2[18];}NetworkCfg;bool GetNetworkCfg(NetworkCfg *cfg){ log_printf("Get network config"); //获取网卡名称 网卡名称，网卡别名 string strAdapterName,strAdapterAlias; 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 FALSE; 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(strstr((char*)szData, "ethernet") != NULL)//  判断是不是以太网卡   {   dwBufSize = 256;   if(RegQueryValueEx(hSubKey, "DriverDesc", 0, &dwDataType, szData, &dwBufSize) == ERROR_SUCCESS)   {    strAdapterName = (LPCTSTR)szData;    dwBufSize = 256;    if(RegQueryValueEx(hSubKey, "NetCfgInstanceID", 0, &dwDataType, szData, &dwBufSize) == ERROR_SUCCESS)    {    strAdapterAlias = (LPCTSTR)szData;    break;    }   }   }  }  RegCloseKey(hNdiIntKey);  }  RegCloseKey(hSubKey); } dwBufSize = 256; }  /* end of while */ RegCloseKey(hKey); if (strAdapterName.empty() || strAdapterAlias.empty()) { log_printf("failed to get network config"); return false; } string strKeyName = "SYSTEM//CurrentControlSet//Services//Tcpip//Parameters//Interfaces//"; strKeyName += strAdapterAlias; if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, strKeyName.c_str(), 0, KEY_READ, &hKey) != ERROR_SUCCESS) return FALSE; dwBufSize = 256; if(RegQueryValueEx(hKey, "DhcpIPAddress", 0,&dwDataType, szData, &dwBufSize) == ERROR_SUCCESS) strcpy(cfg->szIP,(LPCTSTR)szData); else{ if(RegQueryValueEx(hKey, "IPAddress", 0, &dwDataType, szData, &dwBufSize) == ERROR_SUCCESS) strcpy(cfg->szIP,(LPCTSTR)szData); }   dwBufSize = 256; if(RegQueryValueEx(hKey, "DhcpSubnetMask", 0, &dwDataType, szData, &dwBufSize) == ERROR_SUCCESS) strcpy(cfg->szNetmask,(LPCTSTR)szData); else { if(RegQueryValueEx(hKey, "SubnetMask", 0, &dwDataType, szData, &dwBufSize) == ERROR_SUCCESS) trcpy(cfg->szNetmask,(LPCTSTR)szData); }   dwBufSize = 256; if(RegQueryValueEx(hKey, "DhcpDefaultGateway", 0, &dwDataType, szData, &dwBufSize) == ERROR_SUCCESS) strcpy(cfg->szGateway,(LPCTSTR)szData); else { if(RegQueryValueEx(hKey, "DefaultGateway", 0, &dwDataType, szData, &dwBufSize) == ERROR_SUCCESS) strcpy(cfg->szGateway,(LPCSTR)szData); } RegCloseKey(hKey); //获取DNS服务器信息 FIXED_INFO *fi = (FIXED_INFO *)GlobalAlloc(GPTR,sizeof( FIXED_INFO)); ULONG ulOutBufLen = sizeof(FIXED_INFO); DWORD ret = ::GetNetworkParams(fi, &ulOutBufLen); if(ret != ERROR_SUCCESS)  {  GlobalFree(fi); fi = (FIXED_INFO *) GlobalAlloc( GPTR, ulOutBufLen ); ret = ::GetNetworkParams(fi, &ulOutBufLen); if(ret != ERROR_SUCCESS)  {  log_printf("Get Dns server failed");   return false;  } } strcpy(cfg->szDns1,fi->DnsServerList.IpAddress.String); IP_ADDR_STRING *pIPAddr = fi->DnsServerList.Next; if(pIPAddr != NULL)  strcpy(cfg->szDns2, pIPAddr->IpAddress.String); return false;}