c类ip的子网掩码（c类网络地址的子网掩码）

本文以一个完整实例形式介绍了C++实现获取IP、子网掩码、网关、DNS等本机网络参数的方法，供大家参考，具体的完整实例如下：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 #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; }