Question

使用libstrophe，我可以在连接断开时自动重新连接。我在客户端使用了以下代码：

<form>
  <div class="question">
    <header>What's a women called whom lost 90% of her intelligence?</header>
    
    <label><input type="radio" name="question_1" value="a" checked><span>Apple</span></label>
    <label><input type="radio" name="question_1" value="b"><span>Widow</span></label>
    <label><input type="radio" name="question_1" value="c"><span>Nurse</span></label>
  </div>
  
  <div class="question">
    <header>How do you call a man who lost 90% of his intelligence?</header>
    
    <label><input type="radio" name="question_2" value="a"><span>Blue</span></label>
    <label><input type="radio" name="question_2" value="b"><span>Plumber</span></label>
    <label><input type="radio" name="question_2" value="c"><span>Divorced</span></label>
  </div>
</form>

当客户端第一次连接时，我收到消息“DEBUG：connected” 服务器完成后，我收到消息“DEBUG：disconnected”。但是当服务器第二次启动时，客户端不会自动重新连接。

Answer 1

Libstrophe不会自动重新连接。从libstrophe-0.9.0开始xmpp_conn_t对象可以重新连接，而不会丢失登录信息和用户处理程序：

#include <stdio.h>
#include <strophe.h>

void conn_handler(xmpp_conn_t * const conn, const xmpp_conn_event_t status,
                  const int error, xmpp_stream_error_t * const stream_error,
                  void * const userdata)
{
    if (status == XMPP_CONN_CONNECT) {
        fprintf(stderr, "DEBUG: connected\n");
    } else {
        fprintf(stderr, "DEBUG: disconnected, reconnecting...\n");
        xmpp_connect_client(conn, NULL, 0, conn_handler, userdata);
    }
}

int main()
{
    xmpp_log_t  *log;
    xmpp_ctx_t  *ctx;
    xmpp_conn_t *conn;
    const char  *jid  = "test@domain.com";
    const char  *pass = "password";

    xmpp_initialize();
    log = xmpp_get_default_logger(XMPP_LEVEL_ERROR);
    ctx = xmpp_ctx_new(NULL, log);
    conn = xmpp_conn_new(ctx);
    xmpp_conn_set_jid(conn, jid);
    xmpp_conn_set_pass(conn, pass);
    xmpp_connect_client(conn, NULL, 0, conn_handler, NULL);
    xmpp_run(ctx);

    xmpp_conn_release(conn);
    xmpp_ctx_free(ctx);
    xmpp_shutdown();

    return 0;
}

在0.9.0之前的版本中，用户在断开连接后无法重用xmpp_conn_t对象，需要创建新对象。 libstrophe-0.8.8及更早版本的示例：

#include <stdio.h>
#include <strophe.h>

#define TIMEOUT 1000

void conn_handler(xmpp_conn_t * const conn, const xmpp_conn_event_t status,
                  const int error, xmpp_stream_error_t * const stream_error,
                  void * const userdata)
{
    int *reconnect = userdata;

    if (status == XMPP_CONN_CONNECT) {
        fprintf(stderr, "DEBUG: connected\n");
    } else {
        fprintf(stderr, "DEBUG: disconnected, reconnecting...\n");
        *reconnect = 1;
    }
}

int main()
{
    xmpp_log_t  *log;
    xmpp_ctx_t  *ctx;
    xmpp_conn_t *conn;
    const char  *jid  = "test@domain.com";
    const char  *pass = "password";
    int          reconnect;

    xmpp_initialize();
    log = xmpp_get_default_logger(XMPP_LEVEL_ERROR);
    ctx = xmpp_ctx_new(NULL, log);
    while (1) {
        conn = xmpp_conn_new(ctx);
        xmpp_conn_set_jid(conn, jid);
        xmpp_conn_set_pass(conn, pass);
        xmpp_connect_client(conn, NULL, 0, conn_handler, &reconnect);
        reconnect = 0;
        while (!reconnect)
            xmpp_run_once(ctx, TIMEOUT);
        xmpp_conn_release(conn);
    }
    xmpp_ctx_free(ctx);
    xmpp_shutdown();

    return 0;
}

XMPP使用libstrophe自动重新连接

1 个答案: