How to convert IP address char[4] to string...

Question

0.00/5 (No votes)

See more:

I want to know how to convert ipaddr variable to CString.

1. char ipaddr[4];
This means that ipaddr has 4 numbers like xxx.xxx.xxx.xxx (xxx: 0~255)

2. So I wanna to convert this value to CString so display in the Screen using MFC.

I am appreciate if any help me.

Thank you.

What I have tried:

Because I am a novice to C++. So I am very hardful of it.

Posted 15-Mar-16 23:04pm

Member 12330615

Updated 15-Mar-16 23:41pm

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Jochen Arndt · Accepted Answer · 2016-03-15T23:41:00

A simple method would be using CStringT::Format[^]:

CString str;
str.Format(_T("%u.%u.%u.%u"), 
    (unsigned char)ipaddr[3], (unsigned char)ipaddr[2], 
    (unsigned char)ipaddr[1], (unsigned char)ipaddr[0]);

Note the casting to unsigned char. It tells the compiler to treat the signed char as unsigned to avoid negative numbers for values greater than 127. Note also that the above assumes the lowest address part to be in ipaddr[0]. If it is the other way, adjust the indexes.

A more portable way of getting a string from an IP address is using the inet_ntoa function (Windows)[^] (include winsock2.h and link with ws2_32.lib). But this requires copying the IP address to an in_addr structure (Windows)[^] and converting the returned ANSI string:

C++

//#include "winsock2.h" // Include in stdafx.h 
# pragma comment(lib, "ws2_32")

struct in_addr addr;
addr.S_un.S_un_b.s_b1 = ipaddr[0];
addr.S_un.S_un_b.s_b2 = ipaddr[1];
addr.S_un.S_un_b.s_b3 = ipaddr[2];
addr.S_un.S_un_b.s_b4 = ipaddr[3];
CString strIP(inet_ntoa(addr));