主要用到了Iphlpapi.lib,函数接口请参考msdn。
PIP_ADAPTER_ADDRESSES pAddresses = NULL;
char *buffer = NULL;
ULONG outBufLen = 0;
DWORD dwRetVal = 0;
MIB_IPINTERFACE_ROW row;
NETIOAPI_API ret;
GetAdaptersAddresses(AF_UNSPEC,0, NULL, pAddresses,&outBufLen);
//获取需要的缓冲区长度,重新调用,sdk常见用法
buffer = (char *)malloc(outBufLen);
pAddresses = (IP_ADAPTER_ADDRESSES*)buffer;
if(pAddresses == NULL)
return;
if ((dwRetVal = GetAdaptersAddresses(AF_INET,GAA_FLAG_SKIP_ANYCAST,NULL,pAddresses,&outBufLen)) == NO_ERROR) {
//m_adapterInfos.clear();
while (pAddresses) {
std::string adapterName(pAddresses->AdapterName);
std::wstring adapterDescription((pAddresses->Description));
std::wstring adapterFirendName((pAddresses->FriendlyName));
if(adapterDescription.find(L"Adapter") != std::string::npos){
//interested name
InitializeIpInterfaceEntry(&row);
row.InterfaceLuid = pAddresses->Luid;
row.Family = AF_INET ;
row.NlMtu = 1589;
//新的MTU数值
ret = SetIpInterfaceEntry(&row);//主要就是这个函数完成的功能,初始化的时候参考msdn,设置Famlily字段和index或者luid字段,underying adapter.
if(ret == NO_ERROR)
{
AfxMessageBox("SetIpInterfaceEntry OK");
break;
}else{
AfxMessageBox("SetIpInterfaceEntry Failed");
}
}
pAddresses = pAddresses->Next;
}
}
else {
ASSERT(0);
}
free(buffer);
函数显示OK后,可以通过
netsh interface ipv4/ipv6 show subinterfaces来查看,其实设置mtu也可以通过netsh命令来设置的,具体参考命令的帮助。