有什么好的方法判断一个文件正在被占用？

[ISoCai]

有什么好的方法判断一个文件正在被应用程序占用？
这个文件的文件名我知道

[快乐鹦鹉]

以独占方式打开文件，如果失败，可以根据失败的信息判断出是否其他程序占用

[ISoCai]

恩 我也是这么想的，使用MFC的 CFile：：Open方法，以独占方式打开。

有别的更简单的方法吗？

[coyer]

if(!file.Open(m_strTmpFileName,CFile::modeCreate|CFile::modeWrite,&e))
{
switch(e.m_cause)
{
case CFileException::badPath:
tmp="All or part of the path is invalid.";
break;
case CFileException::tooManyOpenFiles:
tmp="The permitted number of open files was exceeded.";
break;
case CFileException::accessDenied:
tmp="The file could not be accessed.";
break;
case CFileException::invalidFile:
tmp="There was an attempt to use an invalid file handle";
break;
case CFileException::directoryFull:
tmp="There are no more directory entries.";
break;
case CFileException::hardIO:
tmp="There was a hardware error.";
break;
case CFileException::diskFull:
tmp="The disk is full";
break;
default:
tmp="An Unknow error occured!";
}


CFileException::none No error occurred.


CFileException::generic An unspecified error occurred.


CFileException::fileNotFound The file could not be located.


CFileException::badPath All or part of the path is invalid.


CFileException::tooManyOpenFiles The permitted number of open files was exceeded.


CFileException::accessDenied The file could not be accessed.


CFileException::invalidFile There was an attempt to use an invalid file handle.


CFileException::removeCurrentDir The current working directory cannot be removed.


CFileException::directoryFull There are no more directory entries.


CFileException::badSeek There was an error trying to set the file pointer.


CFileException::hardIO There was a hardware error.


CFileException::sharingViolation SHARE.EXE was not loaded, or a shared region was locked.


CFileException::lockViolation There was an attempt to lock a region that was already locked.


CFileException::diskFull The disk is full.


CFileException::endOfFile The end of file was reached

[vollin]

#include "io.h"
int _access(const char* path,int mode);

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, errno is set as follows:


mode Value Checks File For
00 Existence only
02 Write permission
04 Read permission
06 Read and write permission


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 <io.h>
#include <stdio.h>
#include <stdlib.h>

void main( void )
{
/* Check for existence */
if( (_access( "ACCESS.C", 0 )) != -1 )
{
printf( "File ACCESS.C exists\n" );
/* Check for write permission */
if( (_access( "ACCESS.C", 2 )) != -1 )
printf( "File ACCESS.C has write permission\n" );
}
}