C中的access函数
int access(const char *filename, int amode);
amode参数为0时表示检查文件的存在性，如果文件存在，返回0，不存在，返回-1。
这个函数还可以检查其它文件属性：
06 检查读写权限
04 检查读权限
02 检查写权限
01 检查执行权限
00 检查文件的存在性
而这个就算这个文件没有读权限，也可以判断这个文件存在于否
存在返回0，不存在返回-1
C函数
函数名: access
功 能: 确定文件的访问权限
用 法: int access(const char *filename, int amode);
[编辑本段]access
Synopsis
#include <io.h>
int _access(const char *path,int mode) ;
Description
The access function, when used with files, determines whether the specified file exists and can be accessed as specified by the value of mode. When used with directories, _access determines only whether the specified directory exists; since under Windows all directories have read and write access.
The mode argument can be one of :
00 Existence only
02 Write permission
04 Read permission
06 Read and write permission
Returns
Zero if the file has the given mode, -1 if an error occurs.
Portability :
Windows. Under Unix a similar function exists too.
Note that lcc-win32 accepts both _access (Microsoft convention) and access.
程序例:
- #include <stdio.h>
- #include <io.h>
- int file_exists(char *filename);
- int main(void)
- {
- printf("Does NOTEXIST.FIL exist: %s\n",
- file_exists("NOTEXISTS.FIL") ? "YES" : "NO");
- return 0;
- }
- int file_exists(char *filename)
- {
- return (access(filename, 0) == 0);
- }
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