Shortcut for VC ++ to determine whether a file or folder exists _ access, vc_access

Shortcut for VC ++ to determine whether a file or folder exists _ access, vc_access

_ Access function

int _access(    const char *path,    int mode );int _waccess(    const wchar_t *path,    int mode );

Parameters

 

Path

File or directory path.

Mode

Read/write features.

Return Value

If the file contains a specific mode, each function returns 0. If the function returns-1, the name file does not exist or does not have a specific mode. In this case, the following tableErrnoAs shown in.

EACCES

Access Denied: The File Permission setting does not allow the specified access permission.

ENOENT

No file name or path found.

EINVAL

Invalid parameter.

Remarks

 

When using files,_ AccessThe function determines whether the specified file or directory exists and has the specified mode value. In use and directory,_ AccessCheck whether the specified directory exists. Only the read and write permissions for all directories in Windows 2000 and later operating systems are available.

Mode Value	Check the file.
00	Only exist
02	Write-only
04	Read-Only
06	Read and Write