1, 在mingw中配置log4c
configure --disable-doc --enable-reread --without-expat --prefix=`pwd`/dest && make -j && make install
小插曲：杀毒软件等，360，qq等，可能会把configure时候产生的conftest.exe误报为病毒，导致configure失败。
2, 修改examples/application_2.c
记住，这个时候，引用的头文件log4c.h依然是package自带的，等会我会创建一个自定义的，这2个文件确实在名字上是冲突的，
现在要引用的package自带的，否则编译不过。
/*
* This is one of log4c example programs.
*
* Notice how no relationships between the category and a certain
* priority, appender, or formatter are coded here. These are all left
* to the log4crc config file so they can be chaned without recompiling
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#ifndef _WIN32
#include <sys/time.h>
#else
#include <time.h>
#include <windows.h>
#include <winsock.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "log4c.h" // 引用package自带的头文件
#define L4C_API __declspec(dllexport)
L4C_API
int l4c_init(void){
return log4c_init();
}
L4C_API
void * l4c_category_get(const char* a_name){
return log4c_category_get(a_name);
}
L4C_API
void l4c_category_log(const void * a_category
, int a_priority
, const char* a_format, ...){
if (log4c_category_is_priority_enabled((log4c_category_t*)a_category
, a_priority))
{
va_list va;
va_start(va, a_format);
log4c_category_vlog(a_category, a_priority, a_format, va);
va_end(va);
}
}
L4C_API
int l4c_fini(void){
return log4c_fini();
}
3, 编译生成log4c.dll
gcc -o log4c.dll -fPIC -shared -static -O0 -g -w -I../dest/include application_2.c ../dest/lib/liblog4c.a
4, 使用dependency walker查看自定义函数的ordinal
也可以用dumpbin查看自定义函数在dll中位置
dumpbin /exports log4c.dll
Microsoft (R) COFF/PE Dumper Version 9.00.30729.01
Copyright (C) Microsoft Corporation. All rights reserved.
Dump of file log4c.dll
File Type: DLL
Section contains the following exports for log4c.dll
00000000 characteristics
516E5C71 time date stamp Wed Apr 17 16:25:21 2013
0.00 version
1 ordinal base
4 number of functions
4 number of names
ordinal hint RVA name
1 0 0000158B l4c_category_get
2 1 0000159E l4c_category_log
3 2 000015DE l4c_fini
4 3 0000157E l4c_init
Summary
1000 .CRT
2000 .bss
1000 .data
5000 .debug_abbrev
1000 .debug_aranges
1000 .debug_frame
18000 .debug_info
5000 .debug_line
11000 .debug_loc
1000 .debug_pubnames
1000 .debug_pubtypes
1000 .debug_ranges
1000 .debug_str
1000 .edata
3000 .eh_frame
1000 .idata
A000 .rdata
1000 .reloc
C000 .text
1000 .tls
5，制作def文件
LIBRARY "log4c"
DESCRIPTION "simple wrapper of log4c"
EXPORTS
l4c_category_get @1
l4c_category_log @2
l4c_fini @3
l4c_init @4
6，生成lib
lib /def:log4c.def /out:log4c.lib /machine:x86
在msvc的命令行里可以执行dumpbin和lib等vc++ sdk的工具
7，制作一个简单的头文件
注意：
区别于package自带的头文件，这个是我自定义的，其实最好的做法是把这篇文章提到的wrapper库，以l4c开头，以区别原始的log4c。
#ifndef _LOG4C_WIN32_H_
#define _LOG4C_WIN32_H_
#ifdef WIN32
#ifdef L4C_EXPORTS
# define L4C_API __declspec(dllexport)
#else
# define L4C_API __declspec(dllimport)
#endif
#else
# define L4C_API
#endif
enum log4c_priority_level_t{
/** fatal */ LOG4C_PRIORITY_FATAL = 000,
/** alert */ LOG4C_PRIORITY_ALERT = 100,
/** crit */ LOG4C_PRIORITY_CRIT = 200,
/** error */ LOG4C_PRIORITY_ERROR = 300,
/** warn */ LOG4C_PRIORITY_WARN = 400,
/** notice */ LOG4C_PRIORITY_NOTICE = 500,
/** info */ LOG4C_PRIORITY_INFO = 600,
/** debug */ LOG4C_PRIORITY_DEBUG = 700,
/** trace */ LOG4C_PRIORITY_TRACE = 800,
/** notset */ LOG4C_PRIORITY_NOTSET = 900,
/** unknown */ LOG4C_PRIORITY_UNKNOWN = 1000
} ;
#ifdef __cplusplus
extern "C" {
#endif
L4C_API int l4c_init(void);
L4C_API void * l4c_category_get(const char* a_name);
L4C_API void l4c_category_log(const void * a_category
, int a_priority
, const char* a_format,...);
L4C_API int l4c_fini(void);
#ifdef __cplusplus
};
#endif
#endif
8， 测试代码
#include "log4c.h"
#pragma comment(lib, "log4c.lib")
int main(int argc, char** argv)
{
int i = 0;
void* mycat = (void*)0;
l4c_init();
mycat = l4c_category_get("six13log.log.app.application2");
for (i = 0; i < 100; i++)
l4c_category_log(mycat, LOG4C_PRIORITY_DEBUG, "Debugging app 2");
l4c_fini();
return 0;
}
9, 测试用的配置文件log4crc
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE log4c SYSTEM "">
<log4c version="1.2.3">
<config>
<bufsize>0</bufsize>
<debug level="2"/>
<nocleanup>0</nocleanup>
<reread>1</reread>
</config>
<category name="root" priority="notice"/>
<category name="six13log.log" priority="error" appender="stdout" />
<rollingpolicy name="myrollingpolicy" type="sizewin" maxsize="1024" maxnum="10" />
<appender name="myrollingfileappender" type="rollingfile" logdir="." prefix="myprefix" layout="dated" rollingpolicy="myrollingpolicy" />
<appender name="stdout" type="stream" layout="basic"/>
<appender name="stderr" type="stream" layout="dated"/>
<appender name="syslog" type="syslog" layout="basic"/>
<appender name="s13file" type="s13_file" layout="basic"/>
<appender name="plain_stderr" type="s13_stderr" layout="none"/>
<appender name="cat_stderr" type="s13_stderr" layout="catlayout"/>
<appender name="xml_stderr" type="s13_stderr" layout="xmllayout"/>
<appender name="user_stderr" type="s13_stderr" layout="userlayout"/>
<layout name="basic" type="basic"/>
<layout name="dated" type="dated"/>
<layout name="catlayout" type="s13_cat"/>
<layout name="xmllayout" type="s13_xml"/>
<layout name="none" type="s13_none"/>
<layout name="userlayout" type="s13_userloc"/>
<category name="six13log.log.app.application2" priority="debug" appender="cat_stderr" />
<category name="six13log.log.app.application3" priority="debug" appender="user_stderr" />
<category name="six13log.log.app" priority="debug" appender="myrollingfileappender" />
</log4c>
10, 编译测试代码
cl test.c
11, 运行测试代码
H:\log4c-1.2.3\examples\dlltest>test.exe [stdout] DEBUG six13log.log.app.application2 - Debugging app 2 [stdout] DEBUG six13log.log.app.application2 - Debugging app 2 [stdout] DEBUG six13log.log.app.application2 - Debugging app 2 [stdout] DEBUG six13log.log.app.application2 - Debugging app 2 [stdout] DEBUG six13log.log.app.application2 - Debugging app 2 [stdout] DEBUG six13log.log.app.application2 - Debugging app 2 [stdout] DEBUG six13log.log.app.application2 - Debugging app 2 [stdout] DEBUG six13log.log.app.application2 - Debugging app 2 [stdout] DEBUG six13log.log.app.application2 - Debugging app 2
12, 截图
