如何获取本地IP地址？
目标：获取本机IP地址。
要求：不通过SOCKET方式,gethostname,gethostbyname等。
忧郁的是上面这几个API在DLL的全局参数中执行不了。编译通过，loadLib出错。
[解决办法]
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
int main(int argc, char **argv)
{
//-----------------------------------------
// Declare and initialize variables
WSADATA wsaData;
int iResult;
DWORD dwError;
struct hostent *remoteHost;
char *host_name;
struct in_addr addr;
// Validate the parameters
if (argc != 2) {
printf("usage: %s ipv4 address\n", argv[0]);
printf(" to return the host\n");
printf(" %s 127.0.0.1\n", argv[0]);
return 1;
}
// Initialize Winsock
iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (iResult != 0) {
printf("WSAStartup failed: %d\n", iResult);
return 1;
}
host_name = argv[1];
// If the user input is an alpha name for the host, use gethostbyname()
// If not, get host by addr (assume IPv4)
if (isalpha(host_name[0])) { /* host address is a name */
printf("Calling gethostbyname with %s\n", host_name);
remoteHost = gethostbyname(host_name);
} else {
printf("Calling gethostbyaddr with %s\n", host_name);
addr.s_addr = inet_addr(host_name);
if (addr.s_addr == INADDR_NONE) {
printf("The IPv4 address entered must be a legal address\n");
return 1;
} else
remoteHost = gethostbyaddr((char *) &addr, 4, AF_INET);
}
if (remoteHost == NULL) {
dwError = WSAGetLastError();
if (dwError != 0) {
if (dwError == WSAHOST_NOT_FOUND) {
printf("Host not found\n");
return 1;
} else if (dwError == WSANO_DATA) {
printf("No data record found\n");
return 1;
} else {
printf("Function failed with error: %ld\n", dwError);
return 1;
}
}
} else {
printf("Function returned:\n");
printf("\tOfficial name: %s\n", remoteHost->h_name);
printf("\tAlternate names: %s\n", remoteHost->h_aliases);
printf("\tAddress type: ");
switch (remoteHost->h_addrtype) {
case AF_INET:
printf("AF_INET\n");
break;
case AF_INET6:
printf("AF_INET\n");
break;
case AF_NETBIOS:
printf("AF_NETBIOS\n");
break;
default:
printf(" %d\n", remoteHost->h_addrtype);
break;
}
printf("\tAddress length: %d\n", remoteHost->h_length);
addr.s_addr = *(u_long *) remoteHost->h_addr_list[0];
printf("\tFirst IP Address: %s\n", inet_ntoa(addr));
}
return 0;
}
