通过Windows套接字编程开发Web服务器C

我是C的初学者，学校任务要求我编写一个可以接受来自网络浏览器（IE，firefox等）的请求的Web服务器，并给出适当的回应。我使用Visual Studio C++ 2010 Express编写代码。通过Windows套接字编程开发Web服务器C

这里是我的代码：

#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(); 
}

该项目不需要我的Web服务器可以从其他计算机的响应，所以我只是用我的IE上运行Web服务器在同一台计算机上。我的网络服务器似乎可以接收来自broswer的请求，但网络浏览器不能显示任何东西。这里是我的网络服务器从命令行输出：

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

当服务器响应浏览器时，会出现一些随机字符。发生了什么，我该如何解决它？顺便说一句，我正在使用中文操作系统（Window7）。

来源

2013-05-01 Choi Shun Chi

缓冲区末尾没有空字符，因此printf写入了过去的内容。

Bytes Received: 100显示您的缓冲区已满。

来源

2013-05-01 10:02:30 Medinoc

通过Windows套接字编程开发Web服务器C

回答

相关问题