C语言 C 的日志库
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Logging library for C
提问by trafalgarx
I am looking for a productive and simple logging library for C, which can output the log to a file. Displaying messages in the log I want to make like this:
我正在为 C 寻找一个高效且简单的日志库，它可以将日志输出到文件中。在日志中显示消息我想像这样：
date-time tag message
It would be nice to control the level of detail of messages and control the size of the file.
控制消息的详细程度并控制文件的大小会很好。
I found two projects that are suitable for me. It log4cand nglogc.
log4c seemed too big. nglogc quite fit, but also has a redundant functional. maybe you tell me more variants?
log4c 似乎太大了。nglogc 相当适合，而且还具有冗余功能。也许你告诉我更多的变种？
回答by Edwin Buck
You can use this
你可以用这个
File logger.h
文件记录器.h
#ifndef LOGGER_H
#define LOGGER_H
void logger(const char* tag, const char* message);
#endif /* LOG_H */
File logger.c
文件记录器.c
#include "logger.h"
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
void logger(const char* tag, const char* message) {
time_t now;
time(&now);
printf("%s [%s]: %s\n", ctime(&now), tag, message);
}
It's probably not perfect, but it does satisfy the needs as you have presented them.
它可能并不完美，但它确实满足了您提出的需求。
回答by HardySimpson
I suggest the log library which is written by myself --- zlog!
推荐自己写的日志库——zlog！
The way to fit your need in zlog is:
在 zlog 中满足您需求的方法是：
$ vi /etc/zlog.conf
[formats]
simple = "%D %c %m%n"
# don't know what the tag mean in your question, so put category of zlog instead
# log level is also available here, add %V means level
[rules]
my_cat.* "xxx.log"; simple
$ vi hello.c
#include <stdio.h>
#include "zlog.h"
int main(int argc, char** argv)
{
int rc;
zlog_category_t *c;
rc = dzlog_init("/etc/zlog.conf", "my_cat");
if (rc) {
printf("init failed\n");
return -1;
}
zlog_info(c, "hello, zlog");
zlog_fini();
return 0;
}
It will generate xxx.log in current directory as
它将在当前目录中生成 xxx.log 作为
2012-09-30 07:22:50 my_cat hello, zlog
Links:
链接：
Download: https://github.com/HardySimpson/zlog/archive/latest-stable.tar.gz
下载：https: //github.com/HardySimpson/zlog/archive/latest-stable.tar.gz
UsersGuide: http://hardysimpson.github.com/zlog/UsersGuide-EN.html
用户指南：http: //hardysimpson.github.com/zlog/UsersGuide-EN.html
Hompage: http://hardysimpson.github.com/zlog/
主页：http://hardysimpson.github.com/zlog/
回答by Babacar
Here is mine:
log.h
------
#ifndef LOG_H
#define LOG_H
void log_error(const char* message, ...); void log_info(const char* message, ...); void log_debug(const char* message, ...);
#endif
log.c
------
#include "log.h"
void log_format(const char* tag, const char* message, va_list args) { time_t now; time(&now); char * date =ctime(&now); date[strlen(date) - 1] = 'init_slog("example", 1, 3);
'; printf("%s [%s] ", date, tag); vprintf(message, args); printf("\n"); }
void log_error(const char* message, ...) { va_list args; va_start(args, message); log_format("error", message, args); va_end(args); }
void log_info(const char* message, ...) { va_list args; va_start(args, message); log_format("info", message, args); va_end(args); }
void log_debug(const char* message, ...) { va_list args; va_start(args, message); log_format("debug", message, args); va_end(args); }
Have fun!
玩得开心！
回答by Sun Dro
You can use this simple logging library: https://github.com/kala13x/slog
你可以使用这个简单的日志库：https: //github.com/kala13x/slog
Here is an example how to use:
这是一个如何使用的示例：
At first you must init log. with init_log() function. First argument is log filename, second argument is log to file (1 enabled, 0 disabled) and third argument is max log level
首先你必须初始化日志。使用 init_log() 函数。第一个参数是日志文件名，第二个参数是日志到文件（1 启用，0 禁用），第三个参数是最大日志级别
slog(0, "Test message with level 0");
slog(2, "Test message with level 2");
slog(0, "Test message with int argument: %d", int_arg);
print and log something
打印并记录一些东西
// file log.c
void log(const char* tag, const char* message) {
time_t now;
struct tm _calendar_time;
char _buf[MAX_COUNT];
time(&now);
localtime_s(&_calendar_time, &now);
strftime(_buf, MAX_COUNT, "%c", &_calendar_time);
printf("%s [%s]: %s\n", _buf, tag, message);
}
Outout will be something like that:
Outout 将是这样的：
2015:04:02:56 - Test message with level 0
2015:04:02:56 - Test message with level 2
2015:04:02:56 - Test message with int argument: 69
2015:04:02:56 - 级别为 0 的测试消息
2015:04:02:56 - 级别为 2 的测试消息
2015:04:02:56 - 带有 int 参数的测试消息：69
回答by wonder.mice
Take a look at the zf_loglogging library. It's small, simple and provides essentials only. From README.md:
查看zf_log日志记录库。它小巧、简单，仅提供必需品。来自 README.md：
This is just a thin wrapper around sprintf() function. It provides less than 20% of functionality found in more sophisticated libraries, but covers more than 80% of common use cases. Focus is made on simplicity, ease of use and performance (to be more precise - low overhead).
这只是 sprintf() 函数的一个薄包装。它提供的功能不到更复杂的库中的 20%，但涵盖了 80% 以上的常见用例。重点在于简单性、易用性和性能（更准确地说 - 低开销）。
Features:
特征：
- Debug logging is reduced to no-op in release builds
- Arguments are not evaluated when the message is not logged
- No "unused" warning for variables used in log statements only
- Log a memory region as HEX and ASCII
- Custom output functions
- 调试日志在发布版本中减少为无操作
- 未记录消息时不评估参数
- 仅在日志语句中使用的变量没有“未使用”警告
- 将内存区域记录为 HEX 和 ASCII
- 自定义输出函数
回答by jtuki
I am also finding solutions on this problem. The answer from @edwin-buck is just simple and OK for my need.
我也在寻找这个问题的解决方案。@edwin-buck 的答案很简单，可以满足我的需要。
I really know nothing on multi-threading and thread-safe, but after compiling under Visual Studio compiler (it can give some warnings and tips), and searching through google, I think a few modification might make the code above thread-safe and better.
我对多线程和线程安全一无所知，但是在Visual Studio编译器下编译后（它可以给出一些警告和提示），并通过google搜索，我认为一些修改可能会使上面的代码线程安全并且更好.
##代码##Feel free to correct me if wrong.
如果错了，请随时纠正我。
