通过Windows套接字编程C开发Web服务器

Question

I am a beginner of C and a school assignment requires me to write a web server that can accept the request from web browser (IE, firefox...etc), and give a proper response. 我是C语言的初学者，一个学校的作业要求我编写一个Web服务器，该服务器可以接受来自Web浏览器（即IE，firefox ...等）的请求，并给出适当的响应。 I used Visual Studio C++ 2010 Express to write the code. 我使用Visual Studio C ++ 2010 Express编写代码。

Here is my code: 这是我的代码：

#include <winsock2.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#define DEFAULT_PORT    5019


int main(int argc, char **argv){

char response[] = "HTTP/1.1 200 OK\r\n"
"Content-Type: text/html; charset=UTF-8\r\n\r\n"
"<doctype !html><html><head><title>Hello World</title></head>"
"<body><h1>Hello world!</h1></body></html>\r\n";

char szBuff[100];
int msg_len;
int addr_len;
struct sockaddr_in local, client_addr;

SOCKET sock, msg_sock;
WSADATA wsaData;

if (WSAStartup(0x202, &wsaData) == SOCKET_ERROR){
    // stderr: standard error are printed to the screen.
    fprintf(stderr, "WSAStartup failed with error %d\n", WSAGetLastError());
    //WSACleanup function terminates use of the Windows Sockets DLL. 
    WSACleanup();
    return -1;
}
// Fill in the address structure
local.sin_family        = AF_INET;
local.sin_addr.s_addr   = INADDR_ANY;
local.sin_port      = htons(DEFAULT_PORT);

sock = socket(AF_INET,SOCK_STREAM, 0);  //TCp socket


if (sock == INVALID_SOCKET){
    fprintf(stderr, "socket() failed with error %d\n", WSAGetLastError());
    WSACleanup();
    return -1;
}

if (bind(sock, (struct sockaddr *)&local, sizeof(local)) == SOCKET_ERROR){
    fprintf(stderr, "bind() failed with error %d\n", WSAGetLastError());
    WSACleanup();
    return -1;
}


//waiting the connection
if (listen(sock, 5) == SOCKET_ERROR){
    fprintf(stderr, "listen() failed with error %d\n", WSAGetLastError());
    WSACleanup();
    return -1;
}


printf("Waiting the connection........\n");

while(1){
addr_len = sizeof(client_addr);
msg_sock = accept(sock, (struct sockaddr*)&client_addr, &addr_len);
if (msg_sock == INVALID_SOCKET){
    fprintf(stderr, "accept() failed with error %d\n", WSAGetLastError());
    WSACleanup();
    return -1;
}

if (msg_sock == -1){
    perror("Unable to accept connection.");
    continue;
}

printf("accepted connection from %s, port %d\n",
    inet_ntoa(client_addr.sin_addr),
    htons(client_addr.sin_port));

msg_len = recv(msg_sock, szBuff, sizeof(szBuff), 0);



printf("Bytes Received: %d, message: %s from %s\n", msg_len, szBuff, inet_ntoa    (client_addr.sin_addr));



msg_len = send(msg_sock, response, sizeof(response)-1 , 0);
if (msg_len == 0){
    printf("Client closed connection\n");
    closesocket(msg_sock);
    return -1;
}

    if (msg_len == SOCKET_ERROR){
    fprintf(stderr, "recv() failed with error %d\n", WSAGetLastError());
    WSACleanup();
    return -1;
}

if (msg_len == 0){
    printf("Client closed connection\n");
    closesocket(msg_sock);
    return -1;
}
closesocket(msg_sock);
}
WSACleanup();
}

The project does not require my web server can response from other computer, so I just use the IE on the same computer I run the web server on. 该项目不需要我的Web服务器可以从其他计算机上进行响应，因此我只在运行Web服务器的同一台计算机上使用IE。 My web server seems can receive the request from broswer but the web broswer cannont display anything. 我的Web服务器似乎可以接收来自浏览器的请求，但是Web浏览器无法显示任何内容。 Here is my web server output from command line: 这是我的Web服务器从命令行输出的内容：

Waiting for connection......
accepted connection from 127.0.0.1, port 53108
Bytes Received: 100, message: GET / HTTP/1.1
Accept-Language: zh-HK
User-Agent: M烫烫烫烫HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8

<doctype !html><html><head><title>Hello World</title></head><body><h1>Hello world!</h1></body></html>
from 127.0.0.1

It seems some random characters occur when the server response to the browser. 服务器响应浏览器时，似乎会出现一些随机字符。 What happened and how can I solve it? 发生了什么事，我该如何解决？ I am using Chinese operating system (Window7) by the way. 顺便说一下，我正在使用中文操作系统（Window7）。

Answer 1

There is no null character at the end of your buffer, so printf writes what's past that. 缓冲区的末尾没有空字符，因此printf写出过去的内容。

The Bytes Received: 100 shows your buffer is full. Bytes Received: 100的Bytes Received: 100显示缓冲区已满。

通过Windows套接字编程C开发Web服务器

问题描述

1 个解决方案

解决方案1
1 已采纳 2013-05-01 10:02:30

通过Windows套接字编程C开发Web服务器

问题描述

1 个解决方案

解决方案1 1 已采纳 2013-05-01 10:02:30

解决方案1
1 已采纳 2013-05-01 10:02:30