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如何在特定目录中搜索某个指定文件
请问如何在特定的目录中搜索某个指定文件?不包括子目录,文件名已知,存在返回真。通过判断_aclearcase/" target="_blank" >ccess( "SETATM.HLP", 0 )) != -1是否为真,如果是,则表明在当前目录中SETATM.HLP是存在的代码如下:
#include
void CSetAtmDlg::OnButtonHelp()
{ LPTSTR lpBuffer="";
CString lpszHelp;
::GetCurrentDirectory(48,lpBuffer);
lpszHelp=(CString)lpBuffer+"\SETATM.HLP";
if( (_access( "SETATM.HLP", 0 )) != -1 )
{
::WinHelp(NULL,lpszHelp,HELP_CONTENTS,0);
}
else
::WinHelp(NULL,"C:\SetAtm\SETATM.HLP",HELP_CONTENTS,0);
}
from MSDN
_access, _waccess
Determine file-access permission.
int _access( const char *path, int mode );
int _waccess( const wchar_t *path, int mode );
Routine Required Header Optional Headers Compatibility
_access
_waccess
For additional compatibility information, see Compatibility in the Introduction.
Libraries
LIBC.LIB Single thread static library, retail version
LIBCMT.LIB Multithread static library, retail version
MSVCRT.LIB Import library for MSVCRT.DLL, retail version
Return Value
Each of these functions returns 0 if the file has the given mode. The function returns ? if the named file does not exist or is not accessible in the given mode; in this case, errno is set as follows:
EACCES
Access denied: file抯 permission setting does not allow specified access.
ENOENT
Filename or path not found.
Parameters
path
File or directory path
mode
Permission setting
Remarks
When used with files, the _access function 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; in Windows NT, all directories have read and write access.
mode Value Checks File For
00 Existence only
02 Write permission
04 Read permission
06 Read and write permission
_waccess is a wide-character version of _access; the path argument to _waccess is a wide-character string. _waccess and _access behave identically otherwise.
Generic-Text Routine Mappings
TCHAR.H Routine _UNICODE & _MBCS Not Defined _MBCS Defined _UNICODE Defined
_taccess _access _access _waccess
Example
/* ACCESS.C: This example uses _access to check the
* file named "ACCESS.C" to see if it exists and if
* writing is allowed.
*/
#include
#include
#include
void main( void )
{
/* Check for existence */
if( (_access( "ACCESS.C", 0 )) != -1 )
{
printf( "File ACCESS.C exists " );
/* Check for write permission */
if( (_access( "ACCESS.C", 2 )) != -1 )
printf( "File ACCESS.C has write permission " );
}
}
Output
File ACCESS.C exists
File ACCESS.C has write permission
File Handling Routines
See Also _chmod, _fstat, _open, _stat
