增加IP地址
在该程序中我想增加IP地址。我看到这样的输出：
125.23.45.67
126.23.45.67
127.23.45.67
128.23.45.67
129.23.45.67
130.23.45.67
131.23.45.67
132.23.45.67
133.23.45.67
134.23.45.67
但我想看到这样的输出：
124.23.45.67
124.23.45.68
124.23.45.68
124.23.45.70
124.23.45.71
124.23.45.72
124.23.45.73
124.23.45.74
124.23.45.75
124.23.45.76
这是程序代码：
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
using namespace std;
#include "winsock2.h"
#pragma comment(lib,"wsock32.lib")
void main()
{
in_addr adr1;
in_addr adr2;
int i;
adr1.s_addr=inet_addr("124.23.45.67");
adr2.s_addr=inet_addr("as.34.34.56");
if (adr1.s_addr!=INADDR_NONE)
cout << " adr1 correct" << endl;
else
cout << " adr1 incorect " << endl;
if (adr2.s_addr!=INADDR_NONE)
cout << " adr2 correct" << endl;
else
cout << " adr2 incorect" << endl;
cout << inet_ntoa(adr1) << endl;
cout << inet_ntoa(adr2) << endl;
for (i=0;i<10;i++)
{
adr1.s_addr ++;
cout << inet_ntoa(adr1) << endl;
}
}
In that program I want to increment IP address. And I see output like that:
125.23.45.67
126.23.45.67
127.23.45.67
128.23.45.67
129.23.45.67
130.23.45.67
131.23.45.67
132.23.45.67
133.23.45.67
134.23.45.67
But I want to see output like this:
124.23.45.67
124.23.45.68
124.23.45.68
124.23.45.70
124.23.45.71
124.23.45.72
124.23.45.73
124.23.45.74
124.23.45.75
124.23.45.76
Here is program code:
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
using namespace std;
#include "winsock2.h"
#pragma comment(lib,"wsock32.lib")
void main()
{
in_addr adr1;
in_addr adr2;
int i;
adr1.s_addr=inet_addr("124.23.45.67");
adr2.s_addr=inet_addr("as.34.34.56");
if (adr1.s_addr!=INADDR_NONE)
cout << " adr1 correct" << endl;
else
cout << " adr1 incorect " << endl;
if (adr2.s_addr!=INADDR_NONE)
cout << " adr2 correct" << endl;
else
cout << " adr2 incorect" << endl;
cout << inet_ntoa(adr1) << endl;
cout << inet_ntoa(adr2) << endl;
for (i=0;i<10;i++)
{
adr1.s_addr ++;
cout << inet_ntoa(adr1) << endl;
}
}
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评论（3）
大端和小端得到另一个！使用 htonl 和 ntohl 来回转换。
Big endian and little endian gets another one! Use htonl and ntohl to convert back and forth.
要增加 IP 地址，您需要将
in_addr对象分解为 4 个int对象（short int也可以）并增加第 4 个，直到达到 256，然后将其重置为 1 并递增第 3 个，依此类推。您不应该直接在in_addr对象上使用++。编辑：好的，所以如果颠倒字节顺序，您可以正确地增加它。我个人不会这样做。特别是如果您所做的只是输出 IP 字符串而不是在代码中的其他位置将它们用作
in_addr。To increment an IP address you will need to break up the
in_addrobject into 4intobjects (ashort intwill also do) and increment the 4th one until it hits 256, and then reset it to 1 and increment the 3rd one, etc. You shouldn't be using++on thein_addrobject directly.EDIT: Okay, so you can properly increment it if you reverse the byte order. I personally wouldn't do it that way. Especially if all you're doing is outputting IP strings and not using them as an
in_addrelsewhere in code.而不是使用
adr1.s_addr：使用这个：
并递增
addr1，即addr1++最后一个八位位组增加。
或者遵循这个公式：
Instead of using
adr1.s_addr:Use this:
And increment
addr1, i.e.addr1++the last octet gets incremented.
Or follow this formula: