【文件系统学习】+小燕+将系统log日志保存为csv文件

发布于 2018-07-18 00:05:01 浏览：2359 订阅该版

4 个回答

lillian 2018-07-18

这家伙很懒，什么也没写！

```
/*
 * 程序清单：将系统log日志保存为csv文件
 *
 * 程序会创建一个操作文件的函数并导出到msh命令列表
 * 将系统log日志保存为csv文件
 * 
*/
#include <rtthread.h>
#include <dfs_posix.h> /* 当需要使用文件操作时，需要包含这个头文件 */
#include <dfs_private.h>

#define LOG_CSV_FILE_NAME	"log.csv"

// 将系统log即通过rt_kprintf输出的log信息保存一份到log.csv文件中
void log_csv(const char *buf)
{
	uint8_t scheduler_started = 0;
        char *fullpath, *path;
	struct dfs_fd fd;
	struct stat file_stat;

// 等待系统调度开始 文件系统正常挂载
	scheduler_started = rt_get_scheduler_stat();
	if (!scheduler_started) {
		return;
	}

// 写log到csv文件
	// 文件路径
	#ifdef DFS_USING_WORKDIR
	path = rt_strdup(working_directory);
	#else
	path = rt_strdup("/");
	#endif
	if (path == NULL)
		return ;
	// 路径+文件名
	fullpath = dfs_normalize_path(path, LOG_CSV_FILE_NAME);
	if (fullpath == NULL) {
		rt_free(path);
		return;
	}
	// 打开文件
        if (dfs_file_open(&fd, fullpath, O_CREAT | O_RDWR)) {
		rt_free(path);
		return;
	}

// 写log到文件
	// 获取文件信息
	if (dfs_file_stat(fullpath, &file_stat)) {
		dfs_file_close(&fd);
		rt_free(path);
		return;
	}
	// 定位到文件末尾
	if (dfs_file_lseek(&fd, file_stat.st_size) < 0) {
		dfs_file_close(&fd);
		rt_free(path);
		return;
	}
	// 写日志
	if (dfs_file_write(&fd, buf, strlen(buf)) < 0) {
		dfs_file_close(&fd);
		rt_free(path);
		return;
	}

dfs_file_close(&fd);
	rt_free(path);
}

/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(log_csv, add log.csv to SD);

```

lillian 2018-07-18

这家伙很懒，什么也没写！

lillian 2018-07-18

这家伙很懒，什么也没写！

```

/**
 * This function will print a formatted string on system console
 *
 * @param fmt the format
 */
void rt_kprintf(const char *fmt, ...)
{
    va_list args;
    rt_size_t length;
    static char rt_log_buf[RT_CONSOLEBUF_SIZE];

va_start(args, fmt);
    /* the return value of vsnprintf is the number of bytes that would be
     * written to buffer had if the size of the buffer been sufficiently
     * large excluding the terminating null byte. If the output string
     * would be larger than the rt_log_buf, we have to adjust the output
     * length. */
    length = rt_vsnprintf(rt_log_buf, sizeof(rt_log_buf) - 1, fmt, args);
    if (length > RT_CONSOLEBUF_SIZE - 1)
        length = RT_CONSOLEBUF_SIZE - 1;
#ifdef RT_USING_DEVICE
    if (_console_device == RT_NULL)
    {
        rt_hw_console_output(rt_log_buf);
    }
    else
    {
        rt_uint16_t old_flag = _console_device->open_flag;

_console_device->open_flag |= RT_DEVICE_FLAG_STREAM;
        rt_device_write(_console_device, 0, rt_log_buf, length);
        _console_device->open_flag = old_flag;
    }
	#if RT_USING_SAMPLE_LOG_CSV
	// 添加日志到csv文件
	log_csv(rt_log_buf);
	#endif
#else
    rt_hw_console_output(rt_log_buf);
#endif
    va_end(args);
}

```