I want to know the each int value to char variable...

Question

1.00/5 (1 vote)

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For example:
CString ip_address = _T("192.168.0.213");

I want to know the method to move each int value 192,168,0,213 to each of char variable with size 1.

Like this:

char ipaddr[4];

ipaddr[0] = 192;

ipaddr[1] = 168;

ipaddr[1] = 0;

ipaddr[1] = 213;

Yes, What I really know is the method of the datatype conversion CString(or char string) to
integer variables.

Thank you.

What I have tried:

In this evening, 3-4 more hours wasted for this problem.

Posted 26-Apr-16 2:24am

Member 12330615

Updated 26-Apr-16 3:03am

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3 solutions

Solution 3

There are several ways to accomplish such a task. You can, for instance, use the Tokenize[^] method to extract all (the string representations of) the octects ant then convert each string to the corresponding byte (e.g. using itoa[^]).

Posted 26-Apr-16 3:03am

CPallini

Solution 1

Split the string at each comma, and use the datatype conversion you already know about on each part. Then just cast the integer value to a byte (or unsigned char) and assign to the four elements to your ipaddr array.
But don't declare it as char - that's a signed 7 bit quantity and IP address elements are unsigned 8 bit values and should be treated as such.
[edit]Minor typos[/edit]

Posted 26-Apr-16 2:38am

OriginalGriff

Updated 26-Apr-16 2:39am

v2

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Jochen Arndt · Accepted Answer · 2016-04-26T02:47:00

This has been asked and answered multiple times. It is just a question of finding the correct search term. I used "c++ parse ip string" and got a lot of useful results:
C++ how to convert ip address to bytes? - Stack Overflow[^]
c - parsing ip adress string in 4 single bytes - Stack Overflow[^]

Once you have choosen a parsing method you must observe that your string is CString (TCHAR *). Therefore, use the _t* versions of the C standard library (e.g. _stscanf). Because most string to integer conversions return an integer, you must cast them to bytes when assigning.

Example using sscanf / _stscanf:

C++

unsigned short a, b, c, d;
// May check the return value here (should be 4) for basic validity check
_stscanf(ip_address.GetString(), _T("%hu.%hu.%hu.%hu"), &a, &b, &c, &d);
unsigned char ipaddr[4];
ipaddr[0] = static_cast<unsigned char>(a);
ipaddr[1] = static_cast<unsigned char>(b);
ipaddr[2] = static_cast<unsigned char>(c);
ipaddr[3] = static_cast<unsigned char>(d);