Downloading (a webpage) in C++

[Ramsin]

Hi, I'm fairly new to socket/network programming.

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
 
using namespace std;
int main() {
    int sockfd;
    sockaddr_in addr;
    char rqt[] = "GET /forum HTTP/1.1\nhost: cplusplus.com\nAccept: text/html";
    char data[1024*1024];
    fstream stream;
 
    addr.sin_family = AF_INET;
    addr.sin_port = htons(80);
    addr.sin_addr.s_addr = inet_addr("50.22.100.250");
    memset(&(addr.sin_zero), '\0', 8);
 
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    connect(sockfd, (sockaddr *) &addr, sizeof(sockaddr_in));
 
    write(sockfd, rqt, strlen(rqt)); // send(sockfd, rqt, strlen(rqt), 0);
    read(sockfd, data, 1024*1024); // recv(sockfd, data, 1024*1024, 0);
 
    stream.open("saved.htm", ios::out | ios::trunc);
    if(stream.good() && stream.is_open()) {
        for(int i=0; i<strlen(data); i++) {
            stream << data[i];
        }
    }
 
    stream.close();
    close(sockfd);
    return 0;
}
 

My question is, why does the program get stuck at read()?
And what's the difference between send()/recv() and read()/write()?
Thanks for help...

[somurulez]

This article might help you.
http://joysofprogramming.com/download-webpage-curl-c/

[johny10151981]

Your program stuck at read?

Not really, you never finished sending header to http server
a line in a herder get end when it get the sequence of "\r\n"
not just "\r"

and header ends when you send "\r\n\r\n" exact pattern
so your actual header would be

char rqt[] = "GET /forum HTTP/1.1\r\nhost: cplusplus.com\r\nAccept: text/html\r\n\r\n";