[英]Linux C how do you dynamically allocate memory for http response chunks?
我是C語言的新手,我試圖將BUFSIZE的HTTP響應塊“追加”到字符串total_response中,然后返回它,我該怎么做?
char *
http_request(char * postdata, char * method, char * host, char * page,
int port, char * useragent)
{
struct sockaddr_in * remote;
int sock;
int tmpres;
char * ip, * get;
sock = create_tcp_socket();
ip = get_ip(host);
remote = (struct sockaddr_in * ) malloc(sizeof(struct sockaddr_in * ));
remote -> sin_family = AF_INET;
tmpres = inet_pton(AF_INET, ip, (void *)(&(remote -> sin_addr.s_addr)));
if (tmpres < 0)
{
//error
return 0;
}
else if (tmpres == 0)
{
//error
return 0;
}
remote -> sin_port = htons(port);
if (connect(sock, (struct sockaddr * ) remote, sizeof(struct sockaddr)) < 0)
{
//error
return 0;
}
get = build_get_query(postdata, method, HOST, PAGE, USERAGENT);
//fprintf(stderr, "%s", get); //response
// Send the query to the server
int sent = 0;
while (sent < strlen(get))
{
tmpres = send(sock, get + sent, strlen(get) - sent, 0);
if (tmpres == -1)
{
//error
return 0;
}
sent += tmpres;
}
// now it is time to receive the page
char buf[BUFSIZ + 1];
memset(buf, 0, sizeof(buf));
int bytes;
do
{
memset(buf, 0, sizeof(buf));
bytes = recv(sock, buf, 1024, 0);
printf("%s", buf); //handle response chunks
if (bytes < 0)
perror("ERROR reading response from socket");
if (bytes == 0)
break;
}
while (1);
free(get);
free(remote);
free(ip);
close(sock);
return "CANT RETURN LOCAL VARIABLE BUF?";
}
非常感謝您的幫助,謝謝!
您可以使用malloc
來擺在首位,並分配塊realloc
放大,如果它被證明不是足夠大。 然后,您只需將指針return
到該塊即可(不要忘記在結尾處放置一個終止的零字節)。 完成后,調用者可以free
該塊。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.