How to Convert int to char*(string) in C++?

Question

SOCKET lhSocket; int iResult; lhSocket = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP); char *sendbuf = "this is a test"; iResult = send(lhSocket, sendbuf, (int)strlen(sendbuf), 0 );

printf("Bytes Sent: %ld\n", iResult);

I have client and Server program using sockets in C++ now i send a buffer it is received by server now when server acknowledge me back saying i got your packet i should get that in string format not bytes received : something. how to achieve that ?

My iresult returns me an integer value, I am sending a message over socket to server , i dont want to print it as Bytes sent : 14. I want to print the message sent as string to server. I am dealing with Sockets. How i can achieve this in C++

Assuming you want to convert iResult to string, you can explore itoa or it's variants. — Chubsdad
– Chubsdad, Commented Aug 19, 2010 at 5:26
OP: The title of your question and your question completely contradict each other. Please clarify... — Thanatos
– Thanatos, Commented Aug 19, 2010 at 5:35

Tomasz Wysocki · Accepted Answer · 2010-08-19 05:26:03Z

4

stringstream buf;
buf << 12345;
buf.str(); // string("12345")
buf.str().c_str(); // char* "12345"

answered Aug 19, 2010 at 5:26

Tomasz Wysocki

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2 Comments

Swapnil Gupta Over a year ago

I have client and Server program using sockets in C++ now i send a buffer it is received by server now when server acknowledge me back saying i got your packet i should get that in string format not bytes received : something. how to achieve that ?

Billy ONeal Over a year ago

@Swapnil: That does not make any sense.

strager · Accepted Answer · 2010-08-19 05:24:09Z

2

sendbuf is the string which you are sending. Print sendbuf instead:

printf("Bytes Sent: %s\n", sendbuf);

answered Aug 19, 2010 at 5:24

strager

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15 Comments

Stephane Rolland Over a year ago

No, it is not the correct answer, this is only the C way of doing things. The standard C++ way of converting stuffs is in the answer of Tomasz. I quote him: stringstream buf; buf << 12345; buf.str(); // string("12345") buf.str().c_str(); // char* "12345"

strager Over a year ago

@Stephane Rolland, How is the "C way of doing things" "not the correct answer"???

Stephane Rolland Over a year ago

@stranger because the use of printf(...) is considered dangerous, as much as the use of any variadic functions ( taking ... arguments ). C++ offers means to achieve this without danger, using the standard std::stringstreams As this question is tagged C++, then the C++ answer in the answer of thomasz.

strager Over a year ago

@Stephane Rolland, "considered dangerous" by whom? I don't see how this answer is wrong because someone could make a mistake. I'm sure every answer involving plain pointers is wrong because it doesn't use smart pointers, then?

Stephane Rolland Over a year ago

@stranger I have found this article informit.com/guides/content.aspx?g=cplusplus&seqNum=72 but anyway I have been told several times to consider using only std::stringstream over printf and itoa and atoi etc... because it is safe, and may not crash, printf can crash if not given the exact number of argument it is waiting for.

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fbasile · Accepted Answer · 2010-08-19 13:00:47Z

1

Another opportunity is boost::lexical_cast<>

const int myIntValue = 12345;
const std::string myStringValue = boost::lexical_cast(myIntValue);

edited Aug 19, 2010 at 13:00

answered Aug 19, 2010 at 12:55

fbasile

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Comments

Tony Delroy · Accepted Answer · 2010-08-19 07:01:33Z

You're asking different things in the title and your post.

Converting int to string in C++ is done with

#include <sstream>
std::ostringstream oss;
oss << some_int;
// do whatever with oss.str()...

as Tomasz illustrated.

To receive data from a socket, you need to make a further call to either recv() or read(). Your "send" call does not itself wait for the reply. recv() or read() accept character-array buffers to read the response into, but you will need to loop reading however much the calls return until you have enough of a response to process, as TCP is what's called a "byte stream" protocol, which means you are not guaranteed to get a complete packet, line, message or anything other than a byte per call.

Given the level of understanding your question implies, I strongly suggest you have a look at the GNU libC examples of sockets programming - there are some server and client examples - easily found via Google.

ShrekOverflow · Accepted Answer · 2011-07-24 08:14:28Z

0

if you use visual C++ 2008 or 2010 i think there is a function inbuilt to do your job.

something like itoa(int); will convert the given int and return a char *

pretty simple

its in stdlib.hlbtw

** make sure this is not the same in all compilers or distrubutions http://www.cplusplus.com/reference/clibrary/cstdlib/itoa/ here is a link for reference

answered Jul 24, 2011 at 8:14

ShrekOverflow

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Comments

bitmask · Accepted Answer · 2012-08-22 14:39:12Z

0

Take a look at itoa which converts an integer to a string.

edited Aug 22, 2012 at 14:39

bitmask

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answered Aug 19, 2010 at 5:32

Markos

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