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分享获取ip地址失败，我认为是字符编码的原因，有时间的帮忙看看啊
WSADATA wsadata;
if(0!=WSAStartup(MAKEWORD(2,2),&wsadata))//初始化
{
AfxMessageBox(_T("初始化网络环境失败！"));
return true;
}
char name[255];
gethostname(name,sizeof(name));
hostent *p=gethostbyname(name);
if(p!=NULL)
{
DWORD dwNum = MultiByteToWideChar(CP_ACP,0,(char *)p->h_addr_list,-1,NULL,0);
wchar_t *pwAddr;
pwAddr = new wchar_t[dwNum];
pwAddr=(wchar_t*)p->h_addr_list;
m_Addr.SetWindowTextW(pwAddr);
if(!pwAddr)
{
delete []pwAddr;
}
}
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jdzfjfhnui 2013-03-22
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typedef struct hostent {
char FAR *h_name;
char FAR FAR **h_aliases;
short h_addrtype;
short h_length;
char FAR FAR **h_addr_list;
} HOSTENT, *PHOSTENT, FAR *LPHOSTENT;
h_addr_list ：
A NULL-terminated list of addresses for the host. Addresses are returned in network byte order. The macro h_addr is defined to be h_addr_list[0] for compatibility with older software.
是指向 DWORD 数组，每个item是一个地址，最后一个item是0，可以通过inet_ntoa转成字符串形式
#define WIN32_LEAN_AND_MEAN
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
// Need to link with Ws2_32.lib
#pragma comment(lib, "ws2_32.lib")
int main(int argc, char **argv)
{
//-----------------------------------------
// Declare and initialize variables
WSADATA wsaData;
int iResult;
DWORD dwError;
int i = 0;
struct hostent *remoteHost;
char *host_name;
struct in_addr addr;
char **pAlias;
// Validate the parameters
if (argc != 2) {
printf("usage: %s ipv4address\n", argv[0]);
printf(" or\n");
printf(" %s hostname\n", argv[0]);
printf(" to return the host\n");
printf(" %s 127.0.0.1\n", argv[0]);
printf(" to return the IP addresses for a host\n");
printf(" %s www.contoso.com\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);
for (pAlias = remoteHost->h_aliases; *pAlias != 0; pAlias++) {
printf("\tAlternate name #%d: %s\n", ++i, *pAlias);
}
printf("\tAddress type: ");
switch (remoteHost->h_addrtype) {
case AF_INET:
printf("AF_INET\n");
break;
case AF_INET6:
printf("AF_INET6\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);
if (remoteHost->h_addrtype == AF_INET) {
while (remoteHost->h_addr_list[i] != 0) {
addr.s_addr = *(u_long *) remoteHost->h_addr_list[i++];
printf("\tIPv4 Address #%d: %s\n", i, inet_ntoa(addr));
}
} else if (remoteHost->h_addrtype == AF_INET6)
printf("\tRemotehost is an IPv6 address\n");
}
return 0;
}
