C++实现获取IP、子网掩码、网关、DNS等本机网络参数的方法

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：

#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;
}

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