编译libevent源代码(Windows)

　　学习笔记，只是记录本次成功用libevent源代码进行编译。环境为MinGW+VS2008+Msys。

0.下载libevent库

　　http://libevent.org/ 下载stable稳定版的库。

1.编译

　　一开始我用MinGW进行编译的，但是总是出现问题。后来参考了这个博客：http://m.blog.csdn.net/blog/bojie5744/39698599 ，把vs的运行环境包含进来，然后再进行编译

call "C:\Program Files\Microsoft Visual Studio 9.0\VC\vcvarsall.bat"

　　./configure ; make ; make install;

　　如果不install也可以，libevent头文件在include里面，而生成的库在.libs里面，由于使用的是vs的运行环境。所以libevent源代码编译后的库后缀为lib，而非以前的a文件。复制 libevent.lib;libevent_core.lib;libevent_extra.lib;(最后给出我编译后的文件，方便没有vs编译环境的人下载使用。) 如果为了以后方便，可以把include目录里文件复制到开发环境的include里面，而.libs里面的三个文件也可以拷贝到mingw的lib文件夹里面。

2.libevent测试代码

#include <winsock2.h>
#include <event2/event.h>
#include <event2/event_struct.h>

int main(int argc, char **argv)
{
event timeout;
return (0);
}

　　编译选项为

　　g++ test.cpp -Iinclude -L. -levent -lws2_32

　　注意测试的编译还是不通过的。要把libevent.lib 文件名改为event.lib就可以通过了，具体为什么就还不清楚。至于为什么MS系的lib库和mingw的的a库文件有什么区别，在Windows下mingw高级版本，两者是没有区别的，都是可以调用使用的。

3.libevent自带的http服务器源码(在sample中的http-server.c)

/*
A trivial static http webserver using Libevent's evhttp.

This is not the best code in the world, and it does some fairly stupid stuff
that you would never want to do in a production webserver. Caveat hackor!

*/

/* Compatibility for possible missing IPv6 declarations */
#include "../util-internal.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <sys/types.h>
#include <sys/stat.h>

#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#include <windows.h>
#include <io.h>
#include <fcntl.h>
#ifndef S_ISDIR
#define S_ISDIR(x) (((x) & S_IFMT) == S_IFDIR)
#endif
#else
#include <sys/stat.h>
#include <sys/socket.h>
#include <signal.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#endif

#include <event2/event.h>
#include <event2/http.h>
#include <event2/buffer.h>
#include <event2/util.h>
#include <event2/keyvalq_struct.h>

#ifdef EVENT__HAVE_NETINET_IN_H
#include <netinet/in.h>
# ifdef _XOPEN_SOURCE_EXTENDED
#  include <arpa/inet.h>
# endif
#endif

#ifdef _WIN32
#ifndef stat
#define stat _stat
#endif
#ifndef fstat
#define fstat _fstat
#endif
#ifndef open
#define open _open
#endif
#ifndef close
#define close _close
#endif
#ifndef O_RDONLY
#define O_RDONLY _O_RDONLY
#endif
#endif

char uri_root[512];

static const struct table_entry {
const char *extension;
const char *content_type;
} content_type_table[] = {
{ "txt", "text/plain" },
{ "c", "text/plain" },
{ "h", "text/plain" },
{ "html", "text/html" },
{ "htm", "text/htm" },
{ "css", "text/css" },
{ "gif", "image/gif" },
{ "jpg", "image/jpeg" },
{ "jpeg", "image/jpeg" },
{ "png", "image/png" },
{ "pdf", "application/pdf" },
{ "ps", "application/postsript" },
{ NULL, NULL },
};

/* Try to guess a good content-type for 'path' */
static const char *
guess_content_type(const char *path)
{
const char *last_period, *extension;
const struct table_entry *ent;
last_period = strrchr(path, '.');
if (!last_period || strchr(last_period, '/'))
goto not_found; /* no exension */
extension = last_period + 1;
for (ent = &content_type_table[0]; ent->extension; ++ent) {
if (!evutil_ascii_strcasecmp(ent->extension, extension))
return ent->content_type;
}

not_found:
return "application/misc";
}

/* Callback used for the /dump URI, and for every non-GET request:
* dumps all information to stdout and gives back a trivial 200 ok */
static void
dump_request_cb(struct evhttp_request *req, void *arg)
{
const char *cmdtype;
struct evkeyvalq *headers;
struct evkeyval *header;
struct evbuffer *buf;

switch (evhttp_request_get_command(req)) {
case EVHTTP_REQ_GET: cmdtype = "GET"; break;
case EVHTTP_REQ_POST: cmdtype = "POST"; break;
case EVHTTP_REQ_HEAD: cmdtype = "HEAD"; break;
case EVHTTP_REQ_PUT: cmdtype = "PUT"; break;
case EVHTTP_REQ_DELETE: cmdtype = "DELETE"; break;
case EVHTTP_REQ_OPTIONS: cmdtype = "OPTIONS"; break;
case EVHTTP_REQ_TRACE: cmdtype = "TRACE"; break;
case EVHTTP_REQ_CONNECT: cmdtype = "CONNECT"; break;
case EVHTTP_REQ_PATCH: cmdtype = "PATCH"; break;
default: cmdtype = "unknown"; break;
}

printf("Received a %s request for %s\nHeaders:\n",
cmdtype, evhttp_request_get_uri(req));

headers = evhttp_request_get_input_headers(req);
for (header = headers->tqh_first; header;
header = header->next.tqe_next) {
printf("  %s: %s\n", header->key, header->value);
}

buf = evhttp_request_get_input_buffer(req);
puts("Input data: <<<");
while (evbuffer_get_length(buf)) {
int n;
char cbuf[128];
n = evbuffer_remove(buf, cbuf, sizeof(cbuf));
if (n > 0)
(void) fwrite(cbuf, 1, n, stdout);
}
puts(">>>");

evhttp_send_reply(req, 200, "OK", NULL);
}

/* This callback gets invoked when we get any http request that doesn't match
* any other callback.  Like any evhttp server callback, it has a simple job:
* it must eventually call evhttp_send_error() or evhttp_send_reply().
*/
static void
send_document_cb(struct evhttp_request *req, void *arg)
{
struct evbuffer *evb = NULL;
const char *docroot = arg;
const char *uri = evhttp_request_get_uri(req);
struct evhttp_uri *decoded = NULL;
const char *path;
char *decoded_path;
char *whole_path = NULL;
size_t len;
int fd = -1;
struct stat st;

if (evhttp_request_get_command(req) != EVHTTP_REQ_GET) {
dump_request_cb(req, arg);
return;
}

printf("Got a GET request for <%s>\n",  uri);

/* Decode the URI */
decoded = evhttp_uri_parse(uri);
if (!decoded) {
printf("It's not a good URI. Sending BADREQUEST\n");
evhttp_send_error(req, HTTP_BADREQUEST, 0);
return;
}

/* Let's see what path the user asked for. */
path = evhttp_uri_get_path(decoded);
if (!path) path = "/";

/* We need to decode it, to see what path the user really wanted. */
decoded_path = evhttp_uridecode(path, 0, NULL);
if (decoded_path == NULL)
goto err;
/* Don't allow any ".."s in the path, to avoid exposing stuff outside
* of the docroot.  This test is both overzealous and underzealous:
* it forbids aceptable paths like "/this/one..here", but it doesn't
* do anything to prevent symlink following." */
if (strstr(decoded_path, ".."))
goto err;

len = strlen(decoded_path)+strlen(docroot)+2;
if (!(whole_path = malloc(len))) {
perror("malloc");
goto err;
}
evutil_snprintf(whole_path, len, "%s/%s", docroot, decoded_path);

if (stat(whole_path, &st)<0) {
goto err;
}

/* This holds the content we're sending. */
evb = evbuffer_new();

if (S_ISDIR(st.st_mode)) {
/* If it's a directory, read the comments and make a little
* index page */
#ifdef _WIN32
HANDLE d;
WIN32_FIND_DATAA ent;
char *pattern;
size_t dirlen;
#else
DIR *d;
struct dirent *ent;
#endif
const char *trailing_slash = "";

if (!strlen(path) || path[strlen(path)-1] != '/')
trailing_slash = "/";

#ifdef _WIN32
dirlen = strlen(whole_path);
pattern = malloc(dirlen+3);
memcpy(pattern, whole_path, dirlen);
pattern[dirlen] = '\\';
pattern[dirlen+1] = '*';
pattern[dirlen+2] = '\0';
d = FindFirstFileA(pattern, &ent);
free(pattern);
if (d == INVALID_HANDLE_VALUE)
goto err;
#else
if (!(d = opendir(whole_path)))
goto err;
#endif

evbuffer_add_printf(evb,
"<!DOCTYPE html>\n"
"<html>\n <head>\n"
"  <meta charset='utf-8'>\n"
"  <title>%s</title>\n"
"  <base href='%s%s'>\n"
" </head>\n"
" <body>\n"
"  <h1>%s</h1>\n"
"  <ul>\n",
decoded_path, /* XXX html-escape this. */
path, /* XXX html-escape this? */
trailing_slash,
decoded_path /* XXX html-escape this */);
#ifdef _WIN32
do {
const char *name = ent.cFileName;
#else
while ((ent = readdir(d))) {
const char *name = ent->d_name;
#endif
evbuffer_add_printf(evb,
"    <li><a href=\"%s\">%s</a>\n",
name, name);/* XXX escape this */
#ifdef _WIN32
} while (FindNextFileA(d, &ent));
#else
}
#endif
evbuffer_add_printf(evb, "</ul></body></html>\n");
#ifdef _WIN32
FindClose(d);
#else
closedir(d);
#endif
evhttp_add_header(evhttp_request_get_output_headers(req),
"Content-Type", "text/html");
} else {
/* Otherwise it's a file; add it to the buffer to get
* sent via sendfile */
const char *type = guess_content_type(decoded_path);
if ((fd = open(whole_path, O_RDONLY)) < 0) {
perror("open");
goto err;
}

if (fstat(fd, &st)<0) {
/* Make sure the length still matches, now that we
* opened the file :/ */
perror("fstat");
goto err;
}
evhttp_add_header(evhttp_request_get_output_headers(req),
"Content-Type", type);
evbuffer_add_file(evb, fd, 0, st.st_size);
}

evhttp_send_reply(req, 200, "OK", evb);
goto done;
err:
evhttp_send_error(req, 404, "Document was not found");
if (fd>=0)
close(fd);
done:
if (decoded)
evhttp_uri_free(decoded);
if (decoded_path)
free(decoded_path);
if (whole_path)
free(whole_path);
if (evb)
evbuffer_free(evb);
}

static void
syntax(void)
{
fprintf(stdout, "Syntax: http-server <docroot>\n");
}

int
main(int argc, char **argv)
{
struct event_base *base;
struct evhttp *http;
struct evhttp_bound_socket *handle;

unsigned short port = 0;
#ifdef _WIN32
WSADATA WSAData;
WSAStartup(0x101, &WSAData);
#else
if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
return (1);
#endif
if (argc < 2) {
syntax();
return 1;
}

base = event_base_new();
if (!base) {
fprintf(stderr, "Couldn't create an event_base: exiting\n");
return 1;
}

/* Create a new evhttp object to handle requests. */
http = evhttp_new(base);
if (!http) {
fprintf(stderr, "couldn't create evhttp. Exiting.\n");
return 1;
}

/* The /dump URI will dump all requests to stdout and say 200 ok. */
evhttp_set_cb(http, "/dump", dump_request_cb, NULL);

/* We want to accept arbitrary requests, so we need to set a "generic"
* cb.  We can also add callbacks for specific paths. */
evhttp_set_gencb(http, send_document_cb, argv[1]);

/* Now we tell the evhttp what port to listen on */
handle = evhttp_bind_socket_with_handle(http, "0.0.0.0", port);
if (!handle) {
fprintf(stderr, "couldn't bind to port %d. Exiting.\n",
(int)port);
return 1;
}

{
/* Extract and display the address we're listening on. */
struct sockaddr_storage ss;
evutil_socket_t fd;
ev_socklen_t socklen = sizeof(ss);
char addrbuf[128];
void *inaddr;
const char *addr;
int got_port = -1;
fd = evhttp_bound_socket_get_fd(handle);
memset(&ss, 0, sizeof(ss));
if (getsockname(fd, (struct sockaddr *)&ss, &socklen)) {
perror("getsockname() failed");
return 1;
}
if (ss.ss_family == AF_INET) {
got_port = ntohs(((struct sockaddr_in*)&ss)->sin_port);
inaddr = &((struct sockaddr_in*)&ss)->sin_addr;
} else if (ss.ss_family == AF_INET6) {
got_port = ntohs(((struct sockaddr_in6*)&ss)->sin6_port);
inaddr = &((struct sockaddr_in6*)&ss)->sin6_addr;
} else {
fprintf(stderr, "Weird address family %d\n",
ss.ss_family);
return 1;
}
addr = evutil_inet_ntop(ss.ss_family, inaddr, addrbuf,
sizeof(addrbuf));
if (addr) {
printf("Listening on %s:%d\n", addr, got_port);
evutil_snprintf(uri_root, sizeof(uri_root),
"http://%s:%d",addr,got_port);
} else {
fprintf(stderr, "evutil_inet_ntop failed\n");
return 1;
}
}

event_base_dispatch(base);

return 0;
}

View Code
　　g++ http-server.c -Iinclude -L. -levent -lws2_32



　　这样就可以当作服务器了。

　　

　　libevent编译后的库下载地址: http://files.cnblogs.com/files/wunaozai/libevent.zip
　　本文地址: http://www.cnblogs.com/wunaozai/p/4550084.html