在ubuntu中安装libevent库遇到的问题

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1.在ubuntu的终端中安装libevent到任意目录下,我选择的是/home/wayne/libevent/

命令如下:

wget https://sourceforge.net/projects/levent/files/libevent/libevent-2.0/libevent-2.0.22-stable.tar.gz

tar –xzvf libevent-2.0.22-stable.tar.gz

cd libevent-2.0.22-stable

./configure --prefix=/home/mydir/libevent  

make && make install

2.在使用libevent的头文件过程中,借用网上的例子:

#include <sys/socket.h>  #include <sys/types.h>  #include <netinet/in.h>  #include <stdio.h> #include <stdlib.h> #include <string.h>#include <unistd.h>#include <iostream>#include <event.h>    using namespace std;  #define PORT        25341  #define BACKLOG     5  #define MEM_SIZE    1024    struct event_base* base;  struct sock_ev {      struct event* read_ev;      struct event* write_ev;      char* buffer;  };    void release_sock_event(struct sock_ev* ev)  {      event_del(ev->read_ev);      free(ev->read_ev);      free(ev->write_ev);      free(ev->buffer);      free(ev);  }    void on_write(int sock, short event, void* arg)  {      char* buffer = (char*)arg;      send(sock, buffer, strlen(buffer), 0);        free(buffer);  }    void on_read(int sock, short event, void* arg)  {      struct event* write_ev;      int size;      struct sock_ev* ev = (struct sock_ev*)arg;      ev->buffer = (char*)malloc(MEM_SIZE);      bzero(ev->buffer, MEM_SIZE);      size = recv(sock, ev->buffer, MEM_SIZE, 0);      printf("receive data:%s, size:%d\n", ev->buffer, size);      if (size == 0) {          release_sock_event(ev);          close(sock);          return;      }      event_set(ev->write_ev, sock, EV_WRITE, on_write, ev->buffer);      event_base_set(base, ev->write_ev);      event_add(ev->write_ev, NULL);  }    void on_accept(int sock, short event, void* arg)  {      struct sockaddr_in cli_addr;      int newfd;    socklen_t sin_size;     struct sock_ev* ev = (struct sock_ev*)malloc(sizeof(struct sock_ev));      ev->read_ev = (struct event*)malloc(sizeof(struct event));      ev->write_ev = (struct event*)malloc(sizeof(struct event));      sin_size = (socklen_t)sizeof(struct sockaddr_in);      newfd = accept(sock, (struct sockaddr*)&cli_addr, &sin_size);      event_set(ev->read_ev, newfd, EV_READ|EV_PERSIST, on_read, ev);      event_base_set(base, ev->read_ev);      event_add(ev->read_ev, NULL);  }    int main(int argc, char* argv[])  {      cout<<"tcp test start...wait..."<<endl;    struct sockaddr_in my_addr;      int sock;        sock = socket(AF_INET, SOCK_STREAM, 0);      int yes = 1;      setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int));      memset(&my_addr, 0, sizeof(my_addr));      my_addr.sin_family = AF_INET;      my_addr.sin_port = htons(PORT);      my_addr.sin_addr.s_addr = INADDR_ANY;      bind(sock, (struct sockaddr*)&my_addr, sizeof(struct sockaddr));      listen(sock, BACKLOG);        struct event listen_ev;      base = event_base_new();      event_set(&listen_ev, sock, EV_READ|EV_PERSIST, on_accept, NULL);      event_base_set(base, &listen_ev);      event_add(&listen_ev, NULL);      event_base_dispatch(base);        return 0;  } 


然后利用g++编译时,会提示


原因是,没有将libevent的include路径设置为系统变量中,所以提示找不到头文件。

使用命令:

gedit /etc/profile

在profile文件的末尾加上

export CPLUS_INCLUDE_PATH=/home/mydir/libevent/include/:$CPLUS_INCLUDE_PATH

. /etc/profile

此问题解决

3.再重新编译时,又出现 下面问题:


原因是g++ -o mytcp mytcp.cpp应该改成g++ -o mytcp mytcp.cpp -levent,这样,上面错误解决

4.但是编译时,还是有一个问题:


原因是没有安装libevent-dev。

使用命令apt-get install libevent-dev安装libevent-dev,问题解决,使用libevent库的c++程序可以通过编译了。


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