9

我有这个头文件......由于某种原因，我不断收到错误消息，说 log_server.h:48: error: expected identifier or ‘(’ before numeric constant 我在定义 put_evt 和 print_evt_list 函数的两行都收到此错误，代码如下所示：

#ifndef _GENERIC
#define _GENERIC
#include <string.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#endif

#ifndef _NETWORKING
#define _NETWORKING
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
#include <sys/types.h>
typedef struct sockaddr SA;/* To make casting in the (bind, recvfrom, sendto) more readable */
#endif

#define LOGIN_EVT 0
#define LOGOUT_EVT 1

#define RECV_MSG 27
#define SEND_MSG 64000
#define MAX_EVT_COUNT 3000

struct evt{ 
    char user_name[8];
    int type;
    long int time;
};



/* open log file to append the events to its end
 * return 0 on success and -1 on failure (file could not be opened)
 */
int init_log(const char *log_fname);

/* closes the log file
 * return 0 on success and -1 on failure (file could not be opened)
 */
int terminate_log();

/* add new event to the log file
 * return 0 on success and -1 on failure
 */
int put_evt(struct evt *e);

/* get list of events that occured after the given time
 * count is the size of the allocated and passed e-list
 * return number of found events on success and -1 on failure
 */
int get_events(struct evt  *e_list, long int time);

/* print given event's info (name, time)*/
void print_evt(struct evt  *e);

/* print "count" event's info from the given e_list info (name, time)*/
void print_evt_list(struct evt  *e_list, int count);

/* startListen takes a port number and returns a listening descriptor on sucess or negavtive on error  */
int startListen(int port);

/* Responsbile for hanlding received messages from clients and responding to them accordingly
if the message is an action done, it'll save it in the log file and notify the client
if the message is a query about the events, it'll call the private function queryHandler(); to handle it
returns negative on ERROR*/
int handle_message(int sockDescriptor, struct sockaddr_in *client, char *recvMessage);

我读过这个错误可能是由于在多行上编写了预处理指令......但我没有。知道我做错了什么吗？

4

4 回答 4

15

问题是我已经struct evt在另一个地方声明了。

于 2012-05-10T21:23:18.133 回答
13

我认为你#define e 2.71828183在前面的标题中有或一些这样的。

要确定答案，请通过预处理器运行代码并查看输出。在 gcc 那是 -E 命令行开关

于 2012-05-03T16:55:14.153 回答
4

我遇到了完全相同的问题，并发现这struct evt是在另一个位置定义的

于 2013-06-22T08:01:22.900 回答
0

我会尝试稍微重命名这些函数。有时，如果其中一个标头定义了您使用的令牌（例如“put_evt”），则预处理器会破坏您的代码。

于 2012-05-03T16:56:36.303 回答