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我是 C 的初学者，学校作业要求我编写一个可以接受来自 Web 浏览器（IE、firefox...等）的请求的 Web 服务器，并给出适当的响应。我使用 Visual Studio C++ 2010 Express 编写代码。

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();
}

该项目不需要我的网络服务器可以从其他计算机响应，所以我只在运行网络服务器的同一台计算机上使用 IE。我的网络服务器似乎可以接收来自浏览器的请求，但网络浏览器无法显示任何内容。这是我从命令行的 Web 服务器输出：

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

服务器响应浏览器时似乎会出现一些随机字符。发生了什么，我该如何解决？顺便说一句，我使用的是中文操作系统（Window7）。

4

1 回答 1

1

缓冲区末尾没有空字符，因此printf写入过去的内容。

显示Bytes Received: 100您的缓冲区已满。

于 2013-05-01T10:02:30.347 回答