socket程式設計（inet_ntoa、inet_addr、htol、htos）

目錄

​​1. inet_addr()​​

​​2. inet_ntoa()​​

​​3. htonl()、htons()​​

1. inet_addr()

将一個點分十進制的字元串IP轉換成一長整型的“網絡位元組序（大端或小端模式）”

char sIP[] = "127.0.0.1";

DWORD dwStr2HexIP = inet_addr(sIP);

printf("dwStr2HexIP=0x%08x\n", dwStr2HexIP);      

輸出結果：

dwStr2HexIP = 0x0100007f      

2. inet_ntoa()

将網絡位元組序的整型值（大端或小端模式）轉換成字元串形式的點分十進制IP位址

char sIP[] = "127.0.0.1";
char sHex2StrIP[32] = {0};

DWORD dwStr2HexIP = inet_addr(sIP);
strcpy(sHex2StrIP, inet_ntoa(*(struct in_addr*)&dwStr2HexIP));
printf("sHex2StrIP=%s\n", sHex2StrIP);      

輸出結果：

sHex2StrIP="127.0.0.1"       

3. htonl()、htons()

DWORD dwIP = 0x7f000001;  //127.0.0.1
WORD wPORT = 0x1234;    //0x1234

DWORD dwNetIP = htonl(dwIP);
WORD dwNetPORT = htons(wPORT);

printf("dwNetIP=0x%08x, dwNetPORT=0x%04x\n", dwNetIP, dwNetPORT);      

dwNetIP=0x0100007f, dwNetPORT=0x3412