473,746 Members | 2,475 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

how to send an int over a socket

Hi,

I have what seems to be a simple problem. But I can not for the life of me
find a way to send an integer over a socket. The send method will only accept
strings. Here is what I am trying to do:

testmessage = 'test message'
msglen = len(testmessage )
sock.send(msgle n)
sock.send(testm essage)

Now, I know I can do this:

testmessage = 'test message'
sock.send('\xC' ) # send hard coded length of testmessage in hex in string
sock.send(testm essage)

However, in my actual program I will not know the length of testmessage in
advance. So how do I convert msglen into a suitable format for the send
method?

Thanks,
Tom
Jul 18 '05 #1
2 19778
Tom Brown <br***@esteem.c om> writes:
However, in my actual program I will not know the length of testmessage in
advance. So how do I convert msglen into a suitable format for the send
method?

str(123)

'123'

You might also look at

http://cr.yp.to/proto/netstrings.txt

which describes some issues you should pay attention to, and suggests
a standardized format.
Jul 18 '05 #2
Use string formatting :

msglen = '%16s' %len(testmessag e)

will return a 16-byte string, beginning with spaces. Send it over your
connection and use int() to get the message length

Pierre
Jul 18 '05 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

0
3030
by: Gregory Hassett | last post by:
Hello, I want to periodically send a TCP packet to a peer, always from the same source port. That is, each packet will come from my local ip address, port 8801, and go to the peer's ip address, to HIS port 8801. This means that I need to bind my sender socket to (myaddress,8801), use it for the send, then shut it down and close it. Then I want to wait, say 30 seconds, and do it all over again. Naturally, the socket's ReuseAddress...
13
8102
by: Manfred Braun | last post by:
Hi All, I am trying to understand the blocking method socket.Send(). The call blocks as expected, but does this mean, it returnes after the underlying TCP layer got a confirmation, that the send data was received by the socket on the remote end? Can I count on that? Do I understand TCP correctly in that, it gives confirmation ? I do not expect, that a .Net based receiver got that data when socket.Send() terminates!
1
1599
by: Hasan O | last post by:
hi , I have a problem with socket.send mesajlar = Encoding.ASCII.GetBytes("UGIR"); socketResultValue = socket.Send(mesajlar,0,mesajlar.Length, SocketFlags.None); socketResultValue = socket.Receive(mesajlar,0,mesajlar.Length,SocketFlags.None);
1
2363
by: Hasan O | last post by:
hi , I have a problem with socket.send mesajlar = Encoding.ASCII.GetBytes("UGIR"); socketResultValue = socket.Send(mesajlar,0,mesajlar.Length, SocketFlags.None); socketResultValue = socket.Receive(mesajlar,0,mesajlar.Length,SocketFlags.None);
1
2158
by: Laura T. | last post by:
Hi, I've this kind a program, using sockets to communicate with the clients. One of the clients can be a web browser (like IE). When using IE as a client, the transmission blocks completely, and IE times out after a long time while stating opening from http://localhost:7765... I have a main thread that starts TCPListener and listens and accepts the connection and queues a worker thread to handle the socket transmission:
11
7723
by: hazz | last post by:
smtpClient.Send(message) is causing me problems as per specifics in the trace below. Email is sent but not without this error typically upon sending the second email, but sometimes when running the app, even the first time. The application will be required to be sending out repeated emails, about one every second or two. Must this be done asynchronously? Thank you. -Greg I get the generic error messages;
2
13151
by: yvan | last post by:
Hi, Here is my client/server scenario: Step1: Client connects to server and sends data sucessfully (using Socket.Send()). Step2: Server gracefully exists (calls Socket.Shutdown() and Socket.Close()). I see the server connection status go from ESTABLISHED to FIN_WAIT2, the client connection go from ESTABLISHED to WAIT_CLOSE. Step3: client.Send() succeeds and return the number of bytes sent (over the closed connection!)
3
4309
by: BuddyWork | last post by:
Hello, Could someone please explain why the Socket.Send is slow to send to the same process it sending from. Eg. Process1 calls Socket.Send which sends to the same IP address and port, the receiver is running within Process1. If I move the receiver into Process2 then its fast. Please can someone explain.
0
3167
by: Buddy Home | last post by:
There is two examples of code. Example 1. Send and Receive within the same process. Put this code in a console app called SendAndReceive and run the code. using System; using System.Collections.Generic; using System.Net; using System.Net.Sockets; using System.Runtime.Serialization.Formatters.Binary;
1
2736
by: danfolkes | last post by:
Hey Everyone, I am trying to send repeated messages from a "Node" to a "Server". It works the first time I send the from the Node to Server, but after that it either errors, or does not do anything. I would love some help, here is the code: import socket import thread import time
0
8800
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
0
9500
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
1
9285
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
9218
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
0
8227
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
0
6060
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
1
3292
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
2
2765
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
3
2199
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.