http_main.cpp

一个简单的http下载程序,用C++在linux下写了一个简单的http下载程序

#include "CSocket.h"
#include <fstream>

int main()
{
	string word;
	string filename;
	string hostname;
	int pos1 = 0;
	int pos2 = 0;

	cout << "enter the host name" << endl;
	cin >> word;

	//bulid the query for http
	string quest = "GET ";
	quest += word;
	quest += " HTTP/1.0\r\n";
	quest += "User-agent:Mozilla/4.0\r\n";
	quest += "Accept-language:zh-cn\r\n\r\n";

	//get the hostname and filename from the word
	string str_http = "http://";
	pos1 = word.find_first_of (str_http, 0);
	pos2 = word.find_first_of ("/", pos1+7);
	hostname = word.substr( pos1+7, pos2-pos1-7 );
	pos1 = word.find_last_of( "/", word.size() );
	filename = word.substr( pos1+1, word.size()-pos1-1 );

	cout << "filename: " << filename << endl;
	cout << "hostname: " << hostname << endl;

	//use the hostname and port 80 to connect 
	Sock_instance s_client( hostname, 80, CLIENT_TYPE );
	if( !s_client.Connect() )
	{
		cout << "connect error" << endl;
		return -1;
	}

	//send the http query to the host
	cout << "connect is ok!" << endl;
	if( !s_client.Send(quest) )
	{
		cout << "send is error!" << endl;
		return -1;
	}

	//recieve all the file from the hsot
	while( s_client.Receive() > 0 )
	{
	}

	//write the binary data which is recieved on the file
	FILE *fp = fopen( filename.c_str(), "wb" );
	fwrite( s_client.data(), sizeof( unsigned char ), s_client.datalen(), fp );
	fclose( fp );
	return 0;
}