有什么好的方法判断一个文件正在被占用？

2004-03-24 02:29:31 277 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Qt判断文件是否被占用，是否可修改 Qt操作文件的类是QFile和QFileInfo。这2个类都没有明确给出API如何判断一个文件是否被占用，是否能被修改、删除等。网上也没有人发在Qt下如何实现的。由于自己需要使用这个功能，没办法，只有自己想办法。想来想去，也没有好主意，只能来硬的。实现如下： //文件存在，且被占用，返回true bool GlobalFunc::isFileUsed(QString fpath) { bool isUsed = false; QString fpathx = fpath + "x"; 阅读详情

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

...全文

C#判断文件是否被占用 1、前言在C#中判断文件是否被占用一般有两种方法，一是利用FileStream结合try...catch...finally实现，二是调用Windows API实现，下面给出两种方法的代码。 2、文件流法 using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleA 阅读详情

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vollin 2004-03-24

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#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" );
}
}

coyer 2004-03-24

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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

ISoCai 2004-03-24

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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？

快乐鹦鹉 2004-03-24

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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

有什么好的方法判断一个文件正在被占用？

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