WINDOWS下安装使用libevent
环境
- IDE:VS2019
- 系统：windows10
- libevent下载地址：http://libevent.org/
- 下载版本号：２.０.22-stable
编译静态库
- 将 libevent-2.0.22-stable.tar.gz 下载至任意盘符，解压至当前文件，得到libevent-2.0.22-stable文件夹。
- 在libevent-2.0.22-stable文件夹下找到下面三个文件：
event_iocp.c
evthread_win32.c
listener.c
打开并在开头加上宏定义：
#define _WIN32_WINNT 0x0500（一定要加在头文件之前）
因为event_iocp.c里用到
#if (_WIN32_WINNT >= 0x0403)
WINBASEAPI
BOOL WINAPI
InitializeCriticalSectionAndSpinCount(
__out LPCRITICAL_SECTION lpCriticalSection,
__in DWORD dwSpinCount
);
WINBASEAPI
DWORD
WINAPI
SetCriticalSectionSpinCount(
__inout LPCRITICAL_SECTION lpCriticalSection,
__in DWORD dwSpinCount
);
#endif
所以要定义_WIN32_WINNT这个宏,而且值要大于0x0403。
如果没有这个宏或不满足条件,编译器会假定这个函数没有定义,
等到链接时再寻找它,这样这个函数的符号就假定返回一个int,
而显示标准库文件里这个函数不是返回int,所以在链接时就会找不到这个函数符号。
- 编译
使用vs的命令行工具（我是 工具–> 命令行(L) --> 开发者命令提示（C）），cd到libevent-2.0.22-stable目录，执行脚本makefile.nmake，命令如下：
nmake /f Makefile.nmake
这样就会生成三个静态库:
libevent_core.lib
libevent_extras.lib
libevent.lib
构建项目
- 新建一个vs空项目
- 在项目目录下建一个libevent文件夹
- 在libevent中新建一个lib文件夹，将上面三个lib文件copy到该目录下。
- 在libevent中再新建一个include文件夹。
- 将libevent-2.0.22-stable\include下的文件和文件夹copy到该目录下。
- 将libevent-2.0.22-stable\WIN32-Code下的文件和文件夹copy到该目录下，
- 整合两个event2目录下的资源，放同一个文件夹下
项目配置
-
VC++目录：
包含目录，添加刚刚新建的include目录
库目录，添加刚刚的lib目录; -
C/C++：
代码生成–>运行库：
Debug模式下选：多线程调试 (/MTd)，
Release下模式下选：多线程 (/MT) -
连接器：
输入->附加依赖项：
ws2_32.lib
wsock32.lib
libevent.lib
libevent_core.lib
libevent_extras.lib
另外两个库ws2_32.lib和wsock32.lib是用来编译Windows网络相关的程序库。
测试代码
- 新建一个main.cpp文件
- 从libevent-2.0.22-stable\sample目录下拷贝time-test.c文件中的代码到main中，代码如下:
/*
* Copyright (c) 2000-2007 Niels Provos
* Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _EVENT2_EVENT_STRUCT_H_
#define _EVENT2_EVENT_STRUCT_H_
/** @file event2/event_struct.h
Structures used by event.h. Using these structures directly WILL harm
forward compatibility: be careful.
No field declared in this file should be used directly in user code. Except
for historical reasons, these fields would not be exposed at all.
*/
#ifdef __cplusplus
extern "C" {
#endif
#include */
#ifndef TAILQ_ENTRY
#define _EVENT_DEFINED_TQENTRY
#define TAILQ_ENTRY(type) \
struct { \
struct type *tqe_next; /* next element */ \
struct type **tqe_prev; /* address of previous next element */ \
}
#endif /* !TAILQ_ENTRY */
#ifndef TAILQ_HEAD
#define _EVENT_DEFINED_TQHEAD
#define TAILQ_HEAD(name, type) \
struct name { \
struct type *tqh_first; \
struct type **tqh_last; \
}
#endif
struct event_base;
struct event {
TAILQ_ENTRY(event) ev_active_next;
TAILQ_ENTRY(event) ev_next;
/* for managing timeouts */
union {
TAILQ_ENTRY(event) ev_next_with_common_timeout;
int min_heap_idx;
} ev_timeout_pos;
evutil_socket_t ev_fd;
struct event_base *ev_base;
union {
/* used for io events */
struct {
TAILQ_ENTRY(event) ev_io_next;
struct timeval ev_timeout;
} ev_io;
/* used by signal events */
struct {
TAILQ_ENTRY(event) ev_signal_next;
short ev_ncalls;
/* Allows deletes in callback */
short *ev_pncalls;
} ev_signal;
} _ev;
short ev_events;
short ev_res; /* result passed to event callback */
short ev_flags;
ev_uint8_t ev_pri; /* smaller numbers are higher priority */
ev_uint8_t ev_closure;
struct timeval ev_timeout;
/* allows us to adopt for different types of events */
void (*ev_callback)(evutil_socket_t, short, void *arg);
void *ev_arg;
};
TAILQ_HEAD (event_list, event);
#ifdef _EVENT_DEFINED_TQENTRY
#undef TAILQ_ENTRY
#endif
#ifdef _EVENT_DEFINED_TQHEAD
#undef TAILQ_HEAD
#endif
#ifdef __cplusplus
}
#endif
#endif /* _EVENT2_EVENT_STRUCT_H_ */
运行结果如下：
