Re: Socket Send Binary (Jpeg)

From:

"Jim Langston" <tazmaster@rocketmail.com>

Newsgroups:

comp.lang.c++

Date:

Wed, 21 Feb 2007 19:35:28 -0800

Message-ID:

<5g8Dh.209$u83.36@newsfe03.lga>

"iwasinnihon" <iwasinnihon@hotmail.com> wrote in message
news:1172113182.263187.323460@l53g2000cwa.googlegroups.com...

Am I missing something? What are you telling me?

On Feb 21, 7:45 pm, "Alf P. Steinbach" <a...@start.no> wrote:

* iwasinnihon:

I writing a program that will send both a text/html document as well
as jpegs using winsock. My code works find for the text, but will not
work with jpegs. My code is below. What am I missing? Can someone
point me in the right direction.

ifstream file;
file.open(r.c_str(), ios::binary);
char buffer[1024] = "";
int BytesSent = 0;
int BytesIndex = 0;
while( !file.eof() ) {
file.read(buffer, 1024);
int BytesLeft = strlen(buffer);

Here.

strlen determines the length of the string by the position of the first NULL
characiter it finds \0 or ascii 0. Binary data, including jpegs, can have
NULL bytes as valid data. You will need some other way to determine how
much data to send (look at the return value of file.read for example).

   while(BytesLeft != 0){
           BytesSent = send(sock, &buffer[BytesIndex], BytesLeft, 0);
           BytesLeft -= BytesSent;
           BytesIndex +=BytesSent;
           cout << buffer << endl;
   }
}

--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?