LINUX下建立临时的方法(函数)有很多, mktemp, tmpfile等等. 今天只推荐最安全最好用的一种: mkstemp.
mkstemp (建立唯一临时文件)头文件: #include <stdlib.h>声明: int mkstemp(char *template)返回值: 成功则返回0, 失败则返回-1.说明: 建立唯一临时文件名, template须以数组形式声明而非指针形式. template格式为: template.XXXXXX. 最后6位必须为XXXXXX, 前缀随意.
上面简单介绍了mkstemp的函数定义, 下面是我写的测试代码.
#include <stdlib.h>
#include <string.h>
#include <stdio.h> #define LEN_FILE_NAME 256 #define TEMP_DIR "/home/daiweitao/Code/c/mkstemp/temp/" #define AREA_LIST 'A'
#define GENRU_LIST 'B' /* Make temparory file */
int mk_temp_file(char file[])
{
/* Return value */
int ret = 0;
if (mkstemp(file) < 0)
{
ret = -1;
}
else
{
printf("Temp file name: [%s] ", file);
}
} /* Generate genru list file */
int genru_list()
{
/* Return value */
int ret = 0;
FILE *fp = NULL;
char file[LEN_FILE_NAME];
memset(file, 0x00, sizeof(file));
strcpy(file, TEMP_DIR);
strcat(file, "cutman.genru.XXXXXX");
if (mk_temp_file(file) < 0)
{
perror("mkstemp");
ret = -1;
}
else
{
if ((fp = fopen(file, "w")) == NULL)
{
perror("fopen");
ret = -2;
}
}
} /* Generate area list file */
int area_list()
{
/* Return value */
int ret = 0;
FILE *fp = NULL;
char file[LEN_FILE_NAME];
memset(file, 0x00, sizeof(file));
strcpy(file, TEMP_DIR);
strcat(file, "cutman.area.XXXXXX");
if (mk_temp_file(file) < 0)
{
perror("mkstemp");
ret = -1;
}
else
{
if ((fp = fopen(file, "w")) == NULL)
{
perror("fopen");
ret = -2;
}
}
} int cutman(char c)
{
/* Return value */
int ret = 0;
{
case AREA_LIST:
ret = area_list();
break;
case GENRU_LIST:
ret = genru_list();
break;
default:
printf("Operation type error ");
break;
}
} int main()
{
return cutman(AREA_LIST);
}
#include <string.h>
#include <stdio.h> #define LEN_FILE_NAME 256 #define TEMP_DIR "/home/daiweitao/Code/c/mkstemp/temp/" #define AREA_LIST 'A'
#define GENRU_LIST 'B' /* Make temparory file */
int mk_temp_file(char file[])
{
/* Return value */
int ret = 0;
/* Make temp file */
if (mkstemp(file) < 0)
{
ret = -1;
}
else
{
printf("Temp file name: [%s] ", file);
}
return ret;
} /* Generate genru list file */
int genru_list()
{
/* Return value */
int ret = 0;
/* File pointer */
FILE *fp = NULL;
/* File name buffer */
char file[LEN_FILE_NAME];
/* Init */
memset(file, 0x00, sizeof(file));
/* Set initial value (template) */
strcpy(file, TEMP_DIR);
strcat(file, "cutman.genru.XXXXXX");
/* TEMP */
if (mk_temp_file(file) < 0)
{
perror("mkstemp");
ret = -1;
}
else
{
if ((fp = fopen(file, "w")) == NULL)
{
perror("fopen");
ret = -2;
}
}
fclose(fp);
return ret;
} /* Generate area list file */
int area_list()
{
/* Return value */
int ret = 0;
/* File pointer */
FILE *fp = NULL;
/* File name buffer */
char file[LEN_FILE_NAME];
/* Init */
memset(file, 0x00, sizeof(file));
/* Set initial value (template) */
strcpy(file, TEMP_DIR);
strcat(file, "cutman.area.XXXXXX");
/* TEMP */
if (mk_temp_file(file) < 0)
{
perror("mkstemp");
ret = -1;
}
else
{
if ((fp = fopen(file, "w")) == NULL)
{
perror("fopen");
ret = -2;
}
}
fclose(fp);
return ret;
} int cutman(char c)
{
/* Return value */
int ret = 0;
switch (c)
{
case AREA_LIST:
ret = area_list();
break;
case GENRU_LIST:
ret = genru_list();
break;
default:
printf("Operation type error ");
break;
}
return ret;
} int main()
{
return cutman(AREA_LIST);
}
执行结果:
$ ./a.out
Temp file name: [/home/daiweitao/Code/c/mkstemp/temp/cutman.area.bGbabc]
Temp file name: [/home/daiweitao/Code/c/mkstemp/temp/cutman.area.bGbabc]