Hi, I am having problem with socket function send();

Is there any limit how many characters can I send with send() function. On the client side I have QT 4.2.2 client with read method.

Is there a problem with server side socket send() function ? Any limit or something ?
Or client side ?

You may send a maximum of the upper range of the largest number supported by a "size_t" (usually an unsigned int) on your system using a single send (2) call.


Check the return value to see if it is sending the number of bytes that you expect.


:davis:

When you say you are "having a problem", does that mean that we are supposed to guess at what the problem is? It's hard enough to guess the answer without having to guess at the problem too.

If by "having a problem" do you mean that send() returned -1? Or what?

If it returned -1, did you use perror() to try to print an error message? (If so, what did the message say? If not, then I suggest you give it a try.)



Since send() is not a standard C library function, details of its operation and limitations depend on the operating system and the compiler that you are using.

However, in general...

1. The send() function will fail if you try to send more octets than the maximum packet size of the underlying protocol.(For example, maximum UDP packet size is 65535 bytes, I think.)

2. Also, many (most???) implementations have a limited buffer size for data that may be smaller than this value. If the socket was opened in blocking mode, the socket will block. If the socket is in non blocking mode and you attempt to send more octets than the buffer size send() will fail.

In most cases, perror() should tell you what the error was.

If none of this helps, perhaps you could give us a few more details. (Like telling us the compiler and operating system. Like telling us the underlying protocol. Like describing any debugging steps that you have tried --- sending smaller packets, for example. Specifically: What worked? What didn't work?)

Regards,

Dave

I am using Windows XP SP2 and Visual Studio .NET 2005. So, what should be the maximum packet size that I can send()?

If you read my previous post, you may realize that the answer is, "It depends."

What, exactly, do you want to do?
What, exactly, have you tried?
What, exactly, happened?
What, exactly, is the problem?


Regards,

Dave