C 判断文件或文件夹是否存在

C/C++中判断某一文件或目录是否存在
1.C++很简单的一种办法：#include<iostream#include<fstreamusingnamespacestd;#defineFILENAME"stat.dat"intmain(){fstream_file;
_file.open(FILENAME,ios::in);if(!_file){cout<<FILENAME<<"没有被创建";}else{cout<<FILENAME<<"已经存在";}return0;}
2.利用 c 语言的库的办法：
函数名: access功能: 确定文件的访问权限用法: int access(const char *filename, intamode);
以前一直没用过这个函数,今天调试程序发现了这个函数,感觉挺好用,尤其是判断一个文件或文件夹是否存在的时候,用不着再find了,文件的话还可以检测读写权限,文件夹的话则只能判断是否存在,下面摘自MSDN：int_access(constchar*path,
intmode);Return Value
Each of these functions returns 0 if the file has the given
mode. The function returns –1 if the named file does not exist or
is not accessible in the given mode; in this case,errnois set as follows:EACCESAccess denied: file’s permission setting does not
allow specified access.
ENOENTFilename or path not found.
ParameterspathFile or directory pathmodePermission settingRemarksWhen used with files, the_accessfunctiondetermines whether the specified file exists and can be accessed as
specified by the value ofmode
. When used with
directories,
_accessdetermines only whether the
specified directory exists; in Windows NT, all directories have
read and write access.
modeValue
Checks File For00
Existence only02
Write permission04
Read permission06
Read and write permissionExample#include<io.h#include<stdio.h#include<stdlib.hvoidmain(void){if((_access("ACCESS.C",0))!=-1){printf("FileACCESS.C

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