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Questions tagged [htonl]

htonl function converts a u_long from host to TCP/IP network byte order (which is big-endian).

Shortcut for Host TO Network translation

The htonl function can be used to convert an IPv4 address in host byte order to the IPv4 address in network byte order.

Docs: https://msdn.microsoft.com/en-us/library/windows/desktop/ms738556(v=vs.85).aspx

Answer: When and how to use C++ htonl function

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Converting dotted IP to integer using htonl(inet_addr(IP_str)) return negative values for IP Adresses of Class B and C

I am trying to convert dotted IP to integer using htonl(inet_addr(IP_str)). The problem is the function returns negative results for IP address of class B and C. here is some of my code (simplified): int main() { const char IP1[] = "10.0.0.0"; …
Rezaeimh7
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Htons byte order conversion

Am new to socket programming and I came up to this Network Byte Conversion mechanisms the htons and the htonl methods. The documentations said that they convert either a 16-bit or a 32-bit network number from a host network byte order to an Internet…
shaddyshad
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Converting from void * to use htonl

I have a void * value in a structure and I need to send it through a socket to a server. I know I need to use int value = htonl(kv->value); but the compiler is throwing errors passing argument 1 of ‘htonl’ makes integer from pointer without a cast…
Tyler Hendrick
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Does any uniform function exists instead of htons htonl

I am trying new the C++ socket programming. I am having some difficulty for understanding functionality of htons, htonl and related functions. I read some documents but still my questions are as follows, for a single server and and single client I…
sandy
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Can Someone give an actual implementation of the pseudo code to convert Host byte order to network byte Order

The Stable Pseudo Code is this mentioned on the following link. I would like to implement it in c++. I am not able to understand and perform these signof and exponentof and mantissaof operations. how to convert double between host and network byte…
Hiesenberg
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having trouble transfer arrays over socket

i am haveing trouble transferring int array over socket in c. what is the correct use of htonl()? lets say i have : int arra[3]={6000,7000,8000}; and socket called new_socket how do i transfer it correctly to the other end of socket? client is…
Ohad Gerrassy
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Using ntohl and htonl problems on iPhone

I have an NSDATA object which I create and then send over the network. I have having trouble getting the correct values out of the received NSDATA stream. Here is some quick code to reproduce my problem. No network transmission required. …
Johnne
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converting uint32_t htonl to char[4] using memcpy does not give output

My question is kind of similar to the one in this link use htonl convert a int number, and memcpy to a char*, but nothing , and there are some other similar questions, but the reason Im asking a new one is because I have not been able to find a…
Dhruv
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Windows sockets htons(80) vs 0x5000

When I am writing port to SOCKADDR_IN structure, can I use 0x5000 instead of htons(80)? (Why 0x5000? -- I debugged htons(80) and it returned 0x5000)
RIscRIpt
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How to send c++ doubles from one system to another Sender: Winsock Receiver: Java

The sending C-side double tmp = htonl(anydouble); send(socket, (char *) &tmp, sizeof(tmp), 0); On the Java side, im reading the network data into a char[8] What is the proper way of performing the conversion back to double? Is it the way to go to…
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Behavior of ntohl and htonl different between Python and C

I'm trying to imitate the behavior of some parts of a C program in Python. They are both reading a binary file where each record is length->data. The C program will pull the length byte from the file, and regardless of whether it's positive or…
Dave
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Python socket: cannot receive int array

I try to make a inter process communication between a Python and c program via winsockets. Sending a string does work, but now I try to send an int array from the c socket to the python socket. I already found out that I have to use htonl() to…
Gora
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