# QAbstractFileEngine Class Reference
## [[QtCore](index.htm) module]
該QAbstractFileEngine類提供了訪問文件系統的抽象。[More...](#details)
通過繼承[QFSFileEngine](qfsfileengine.html)。
### Types
* `enum FileFlag { ReadOwnerPerm, WriteOwnerPerm, ExeOwnerPerm, ReadUserPerm, ..., Refresh }`
* `class **[FileFlags](index.htm)**`
* `enum FileName { DefaultName, BaseName, PathName, AbsoluteName, ..., BundleName }`
* `enum FileOwner { OwnerUser, OwnerGroup }`
* `enum FileTime { CreationTime, ModificationTime, AccessTime }`
### Methods
* `__init__ (self)`
* `bool atEnd (self)`
* `QAbstractFileEngineIterator beginEntryList (self, QDir.Filters?filters, QStringList?filterNames)`
* `bool caseSensitive (self)`
* `bool close (self)`
* `bool copy (self, QString?newName)`
* `QStringList entryList (self, QDir.Filters?filters, QStringList?filterNames)`
* `QFile.FileError error (self)`
* `QString errorString (self)`
* `FileFlags fileFlags (self, FileFlags?type?=?QAbstractFileEngine.FileInfoAll)`
* `QString fileName (self, FileName?file?=?QAbstractFileEngine.DefaultName)`
* `QDateTime fileTime (self, FileTime?time)`
* `bool flush (self)`
* `int handle (self)`
* `bool isRelativePath (self)`
* `bool isSequential (self)`
* `bool link (self, QString?newName)`
* `sip.voidptr map (self, int?offset, int?size, QFile.MemoryMapFlags?flags)`
* `bool mkdir (self, QString?dirName, bool?createParentDirectories)`
* `bool open (self, QIODevice.OpenMode?openMode)`
* `QString owner (self, FileOwner)`
* `int ownerId (self, FileOwner)`
* `int pos (self)`
* `str read (self, int?maxlen)`
* `str readLine (self, int?maxlen)`
* `bool remove (self)`
* `bool rename (self, QString?newName)`
* `bool rmdir (self, QString?dirName, bool?recurseParentDirectories)`
* `bool seek (self, int?pos)`
* `setError (self, QFile.FileError?error, QString?str)`
* `setFileName (self, QString?file)`
* `bool setPermissions (self, int?perms)`
* `bool setSize (self, int?size)`
* `int size (self)`
* `bool unmap (self, sip.voidptr?ptr)`
* `int write (self, str?data)`
### Static Methods
* `QAbstractFileEngine create (QString?fileName)`
* * *
## Detailed Description
該QAbstractFileEngine類提供了訪問文件系統的抽象。
該[QDir](qdir.html),[QFile](qfile.html)和[QFileInfo](qfileinfo.html)類中的所有使用內部一個QAbstractFileEngine的。如果您創建自己的QAbstractFileEngine子類(和使用Qt創建一個注冊它[QAbstractFileEngineHandler](qabstractfileenginehandler.html)子類) ,當路徑是指你的文件引擎處理您的文件引擎將被使用。
一個QAbstractFileEngine是指一個文件或一個目錄。如果所指的是一個文件時,[setFileName](qabstractfileengine.html#setFileName)( )[rename](qabstractfileengine.html#rename)()和[remove](qabstractfileengine.html#remove)()函數是適用的。如果所指的是一個目錄[mkdir](qabstractfileengine.html#mkdir)( )[rmdir](qabstractfileengine.html#rmdir)()和[entryList](qabstractfileengine.html#entryList)()函數是適用的。在所有情況下[caseSensitive](qabstractfileengine.html#caseSensitive)( )[isRelativePath](qabstractfileengine.html#isRelativePath)( )[fileFlags](qabstractfileengine.html#fileFlags)( )[ownerId](qabstractfileengine.html#ownerId)( )[owner](qabstractfileengine.html#owner)()和[fileTime](qabstractfileengine.html#fileTime)()函數是適用的。
一個QAbstractFileEngine子類可以被創建來做到同步網絡I / O的文件系統操作,本地文件系統操作,或作為一個系統資源的訪問基于文件的資源。
* * *
## Type Documentation
```
QAbstractFileEngine.FileFlag
```
的權限和類型的文件,適于中用OR在一起。
| Constant | Value | Description |
| --- | --- | --- |
| `QAbstractFileEngine.ReadOwnerPerm` | `0x4000` | 該文件的所有者有權讀取它。 |
| `QAbstractFileEngine.WriteOwnerPerm` | `0x2000` | 該文件的所有者具有寫權限了。 |
| `QAbstractFileEngine.ExeOwnerPerm` | `0x1000` | 該文件的所有者有權執行它的權限。 |
| `QAbstractFileEngine.ReadUserPerm` | `0x0400` | 當前用戶有權限讀取該文件。 |
| `QAbstractFileEngine.WriteUserPerm` | `0x0200` | 當前用戶有權限寫入到文件中。 |
| `QAbstractFileEngine.ExeUserPerm` | `0x0100` | 當前用戶擁有執行該文件的權限。 |
| `QAbstractFileEngine.ReadGroupPerm` | `0x0040` | 當前用戶組的成員有權限讀取的文件。 |
| `QAbstractFileEngine.WriteGroupPerm` | `0x0020` | 當前用戶組的成員具有寫權限的文件。 |
| `QAbstractFileEngine.ExeGroupPerm` | `0x0010` | 當前用戶組的成員具有執行該文件的權限。 |
| `QAbstractFileEngine.ReadOtherPerm` | `0x0004` | 所有用戶有權限讀取的文件。 |
| `QAbstractFileEngine.WriteOtherPerm` | `0x0002` | 所有用戶都具有寫權限的文件。 |
| `QAbstractFileEngine.ExeOtherPerm` | `0x0001` | 所有的用戶都具有執行該文件的權限。 |
| `QAbstractFileEngine.LinkType` | `0x10000` | 該文件是在文件系統(即不是一個文件或目錄)鏈接到另一個文件(或鏈接) 。 |
| `QAbstractFileEngine.FileType` | `0x20000` | 該文件是一個普通文件到文件系統(即不是鏈接或目錄) |
| `QAbstractFileEngine.BundleType` | `0x80000` | 該文件是一個Mac OS X的包意味著DirectoryType |
| `QAbstractFileEngine.DirectoryType` | `0x40000` | 該文件是在文件系統(即不是鏈接或文件)的目錄。 |
| `QAbstractFileEngine.HiddenFlag` | `0x0100000` | 該文件是隱藏的。 |
| `QAbstractFileEngine.ExistsFlag` | `0x0400000` | 該文件實際上存在于文件系統中。 |
| `QAbstractFileEngine.RootFlag` | `0x0800000` | 該文件或文件指向的是文件系統的根。 |
| `QAbstractFileEngine.LocalDiskFlag` | `0x0200000` | 該文件駐留在本地磁盤上,并且可以通過標準的文件的功能。 |
| `QAbstractFileEngine.Refresh` | `0x1000000` | 傳遞此標志將強制文件引擎刷新所有標志。 |
該FileFlags類型是一個typedef為[QFlags](index.htm)\u003cFileFlag\u003e 。它存儲FileFlag值的或組合。
**See also** [fileFlags](qabstractfileengine.html#fileFlags)()和[setFileName](qabstractfileengine.html#setFileName)( ) 。
```
QAbstractFileEngine.FileName
```
這些值被用來以特定的格式要求一個文件名。
| Constant | Value | Description |
| --- | --- | --- |
| `QAbstractFileEngine.DefaultName` | `0` | 傳遞給了相同的文件名[QAbstractFileEngine](qabstractfileengine.html)。 |
| `QAbstractFileEngine.BaseName` | `1` | 不包括路徑中的文件的名稱。 |
| `QAbstractFileEngine.PathName` | `2` | 的路徑,不包括基本名稱的文件。 |
| `QAbstractFileEngine.AbsoluteName` | `3` | 絕對路徑文件(包括基本名稱) 。 |
| `QAbstractFileEngine.AbsolutePathName` | `4` | 絕對路徑文件(不包括基本名稱) 。 |
| `QAbstractFileEngine.LinkName` | `5` | 該文件是一個鏈接到該文件的完整文件名。 (這將是空的,如果這個文件是不是鏈接。 ) |
| `QAbstractFileEngine.CanonicalName` | `6` | 往往很相似,鏈接名稱。將返回真正的文件路徑。 |
| `QAbstractFileEngine.CanonicalPathName` | `7` | 同CanonicalName ,不包括基本名稱。 |
| `QAbstractFileEngine.BundleName` | `8` | 返回該包的名稱所暗示[BundleType](qabstractfileengine.html#FileFlag-enum)被設置。 |
**See also** [fileName](qabstractfileengine.html#fileName)()和[setFileName](qabstractfileengine.html#setFileName)( ) 。
```
QAbstractFileEngine.FileOwner
```
| Constant | Value | Description |
| --- | --- | --- |
| `QAbstractFileEngine.OwnerUser` | `0` | 誰擁有該文件的用戶。 |
| `QAbstractFileEngine.OwnerGroup` | `1` | 誰擁有該文件的組。 |
**See also** [owner](qabstractfileengine.html#owner)( )[ownerId](qabstractfileengine.html#ownerId)()和[setFileName](qabstractfileengine.html#setFileName)( ) 。
```
QAbstractFileEngine.FileTime
```
這些被使用的[fileTime](qabstractfileengine.html#fileTime)()函數。
| Constant | Value | Description |
| --- | --- | --- |
| `QAbstractFileEngine.CreationTime` | `0` | 當創建該文件。 |
| `QAbstractFileEngine.ModificationTime` | `1` | 當文件最近被修改。 |
| `QAbstractFileEngine.AccessTime` | `2` | 當最近被訪問的文件(例如,讀取或寫入) 。 |
**See also** [setFileName](qabstractfileengine.html#setFileName)( ) 。
* * *
## Method Documentation
```
QAbstractFileEngine.__init__ (self)
```
構造一個新的[QAbstractFileEngine](qabstractfileengine.html)這并不是指任何文件或目錄。
**See also** [setFileName](qabstractfileengine.html#setFileName)( ) 。
```
bool QAbstractFileEngine.atEnd (self)
```
返回True如果當前位置是在文件的末尾,否則返回False 。
該功能立足于調用它的行為[extension](qabstractfileengine.html#extension)( )與[AtEndExtension](qabstractfileengine.html#Extension-enum)。如果引擎不支持此擴展,則返回False。
此功能被引入Qt的4.3 。
**See also** [extension](qabstractfileengine.html#extension)( )[supportsExtension](qabstractfileengine.html#supportsExtension)()和[QFile.atEnd](qfile.html#atEnd)( ) 。
```
QAbstractFileEngineIterator QAbstractFileEngine.beginEntryList (self, QDir.Filters?filters, QStringList?filterNames)
```
[](qabstractfileengineiterator.html)
[返回一個實例](qabstractfileengineiterator.html)[QAbstractFileEngineIterator](qabstractfileengineiterator.html) using _filters_入門過濾和_filterNames_對于名稱的過濾。調用此函數由[QDirIterator](qdiriterator.html)啟動目錄迭代。
[QDirIterator](qdiriterator.html)需要返回的實例的所有權,并刪除它時,它的完成。
**See also** [QDirIterator](qdiriterator.html)。
```
bool QAbstractFileEngine.caseSensitive (self)
```
應返回True如果底層文件系統是大小寫敏感的,否則返回False 。
這個虛函數必須在子類中重新實現。
```
bool QAbstractFileEngine.close (self)
```
關閉文件,返回True,如果成功,否則返回False 。
默認的實現始終返回False 。
```
bool QAbstractFileEngine.copy (self, QString?newName)
```
復制這個文件的內容與名稱的文件_newName_。成功時返回TRUE ,否則返回False 。
```
QAbstractFileEngine QAbstractFileEngine.create (QString?fileName)
```
[](qabstractfileengine.html)
[創建并返回一個](qabstractfileengine.html)[QAbstractFileEngine](qabstractfileengine.html)適于處理_fileName_。
你不應該需要調用這個函數;使用[QFile](qfile.html),[QFileInfo](qfileinfo.html) or [QDir](qdir.html)直接代替。
如果您reimplemnt這個功能,它應該只返回一個知道如何處理文件引擎_fileName_否則,它應該返回0 。
**See also** [QAbstractFileEngineHandler](qabstractfileenginehandler.html)。
```
QStringList QAbstractFileEngine.entryList (self, QDir.Filters?filters, QStringList?filterNames)
```
請所有文件的列表匹配_filters_基于所述列表_filterNames_在文件引擎的目錄中返回。
應該返回一個空列表,如果該文件引擎指的是文件,而不是一個目錄,或者目錄是不可讀的或者不存在,或者如果沒有相匹配的規格。
這個虛函數必須在子類中重新實現。
**See also** [setFileName](qabstractfileengine.html#setFileName)( ) 。
```
QFile.FileError QAbstractFileEngine.error (self)
```
[](qfile.html#FileError-enum)
[返回](qfile.html#FileError-enum)[QFile.FileError](qfile.html#FileError-enum)這是由于過去失敗的操作。如果[QFile.UnspecifiedError](qfile.html#FileError-enum)返回,[QFile](qfile.html)將利用自身的錯誤狀態的想法。
**See also** [setError](qabstractfileengine.html#setError)( )[QFile.FileError](qfile.html#FileError-enum)和[errorString](qabstractfileengine.html#errorString)( ) 。
```
QString QAbstractFileEngine.errorString (self)
```
返回人類可讀的消息恰當報告的當前錯誤[error](qabstractfileengine.html#error)( ) 。如果沒有合適的字符串是可用的,則返回一個空字符串。
**See also** [error](qabstractfileengine.html#error)( ) 。
```
FileFlags QAbstractFileEngine.fileFlags (self, FileFlags?type?=?QAbstractFileEngine.FileInfoAll)
```
[
這個函數應該返回一組邏輯與的標志,是真實的文件引擎的文件,那是在_type_的邏輯與的成員。
在你重新實現可以使用_type_參數作為優化提示,并只返回或運算組成員是真實的和那場比賽中的那些_type_換句話說,您可以忽略不提及任何成員_type_,從而避免一些潛在的昂貴的查找或系統調用。
這個虛函數必須在子類中重新實現。
](index.htm)
[**See also**](index.htm) [setFileName](qabstractfileengine.html#setFileName)( ) 。
```
QString QAbstractFileEngine.fileName (self, FileName?file?=?QAbstractFileEngine.DefaultName)
```
返回由指定格式的文件引擎的當前文件名_file_。
如果不處理某些`FileName`可能性,返回文件名設置[setFileName](qabstractfileengine.html#setFileName)( )當未處理的格式要求。
這個虛函數必須在子類中重新實現。
**See also** [setFileName](qabstractfileengine.html#setFileName)()和[FileName](qabstractfileengine.html#FileName-enum)。
```
QDateTime QAbstractFileEngine.fileTime (self, FileTime?time)
```
[
If _time_ is `CreationTime`,創建文件時返回。如果_time_ is `ModificationTime`,返回當文件最近被修改。如果_time_ is `AccessTime`,返回時被最近訪問的文件(如讀或寫) 。如果時間無法確定返回QDateTime ( ) (一個無效的日期時間) 。
這個虛函數必須在子類中重新實現。
](qdatetime.html)
[**See also**](qdatetime.html) [setFileName](qabstractfileengine.html#setFileName)( )[QDateTime](qdatetime.html),[QDateTime.isValid](qdatetime.html#isValid)()和[FileTime](qabstractfileengine.html#FileTime-enum)。
```
bool QAbstractFileEngine.flush (self)
```
刷新打開文件,返回True,如果成功,否則返回False 。
默認的實現始終返回False 。
```
int QAbstractFileEngine.handle (self)
```
返回本機文件句柄這個文件引擎。此句柄必須小心使用,它的價值和類型是特定的平臺,并利用它很可能會導致不可移植的代碼。
```
bool QAbstractFileEngine.isRelativePath (self)
```
返回True,如果該文件引擎所指的文件有一個相對路徑,否則返回False 。
這個虛函數必須在子類中重新實現。
**See also** [setFileName](qabstractfileengine.html#setFileName)( ) 。
```
bool QAbstractFileEngine.isSequential (self)
```
返回True如果該文件是一個順序存取設備,如果該文件是一個直接存取設備返回False。
涉及業務[size](qabstractfileengine.html#size)( )和seek( INT)是不是在連續的設備有效。
```
bool QAbstractFileEngine.link (self, QString?newName)
```
從創建該文件目前由指定的鏈接[fileName](qabstractfileengine.html#fileName)()來_newName_。什么鏈接是依賴于底層的文件系統(無論是在Windows還是Unix上符號鏈接的快捷方式)上。成功返回True ,否則返回False 。
```
sip.voidptr QAbstractFileEngine.map (self, int?offset, int?size, QFile.MemoryMapFlags?flags)
```
地圖_size_該文件的字節到存儲器中,起始_offset_。返回一個指向內存的指針,如果成功,如果,例如,發生錯誤,否則返回False 。
該功能立足于調用它的行為[extension](qabstractfileengine.html#extension)( )與[MapExtensionOption](index.htm)。如果引擎不支持此擴展,則返回0 。
_flags_目前沒有使用,但可能在將來被使用。
此功能被引入Qt的4.4 。
**See also** [unmap](qabstractfileengine.html#unmap)()和[supportsExtension](qabstractfileengine.html#supportsExtension)( ) 。
```
bool QAbstractFileEngine.mkdir (self, QString?dirName, bool?createParentDirectories)
```
請求的目錄_dirName_被創建。如果_createParentDirectories_是真的,那么在任何子目錄_dirName_不存在必須被創建。如果_createParentDirectories_為False,則在任何子目錄_dirName_必須已經為函數成功存在。如果操作成功,返回True ,否則返回False 。
這個虛函數必須在子類中重新實現。
**See also** [setFileName](qabstractfileengine.html#setFileName)( )[rmdir](qabstractfileengine.html#rmdir)()和[isRelativePath](qabstractfileengine.html#isRelativePath)( ) 。
```
bool QAbstractFileEngine.open (self, QIODevice.OpenMode?openMode)
```
打開文件在指定的_mode_。返回True如果文件被成功打開,否則返回False 。
該_mode_是一個OR組合[QIODevice.OpenMode](qiodevice.html#OpenModeFlag-enum)和QIODevice.HandlingMode值。
```
QString QAbstractFileEngine.owner (self, FileOwner)
```
If _owner_ is `OwnerUser`返回誰擁有該文件的用戶的名稱。如果_owner_ is `OwnerGroup`返回擁有該文件的組的名稱。如果你不能確定業主回報的QString ( ) 。
這個虛函數必須在子類中重新實現。
**See also** [ownerId](qabstractfileengine.html#ownerId)( )[setFileName](qabstractfileengine.html#setFileName)()和[FileOwner](qabstractfileengine.html#FileOwner-enum)。
```
int QAbstractFileEngine.ownerId (self, FileOwner)
```
If _owner_ is `OwnerUser`返回誰擁有該文件的用戶的ID 。如果_owner_ is `OwnerGroup`返回擁有該文件的組ID 。如果你不能確定業主返回-2 。
這個虛函數必須在子類中重新實現。
**See also** [owner](qabstractfileengine.html#owner)( )[setFileName](qabstractfileengine.html#setFileName)()和[FileOwner](qabstractfileengine.html#FileOwner-enum)。
```
int QAbstractFileEngine.pos (self)
```
返回當前文件位置。
這是讀出的文件/寫頭中的數據的位置。
```
str QAbstractFileEngine.read (self, int?maxlen)
```
讀取的字符數從文件導入_data_。最多_maxlen_字符將被讀取。
如果發生致命錯誤,或者0,如果沒有要讀取的字節,則返回-1 。
```
str QAbstractFileEngine.readLine (self, int?maxlen)
```
該函數讀取一行,由一個'\ n“字符終止,從文件信息_data_。最多_maxlen_字符將被讀取。行尾的字符被包括在內。
```
bool QAbstractFileEngine.remove (self)
```
該文件從文件系統中刪除請求。如果操作成功,返回True ,否則返回False 。
這個虛函數必須在子類中重新實現。
**See also** [setFileName](qabstractfileengine.html#setFileName)()和[rmdir](qabstractfileengine.html#rmdir)( ) 。
```
bool QAbstractFileEngine.rename (self, QString?newName)
```
請求該文件被重命名為_newName_在文件系統中。如果操作成功,返回True ,否則返回False 。
這個虛函數必須在子類中重新實現。
**See also** [setFileName](qabstractfileengine.html#setFileName)( ) 。
```
bool QAbstractFileEngine.rmdir (self, QString?dirName, bool?recurseParentDirectories)
```
請求的目錄_dirName_從文件系統中刪除。何時_recurseParentDirectories_是真的,那么任何空的父目錄中_dirName_也必須刪除。如果_recurseParentDirectories_是假的,只有_dirName_葉節點應予刪除。在大多數文件系統的目錄中不能使用該功能,如果它是一個非空被刪除。如果操作成功,返回True ,否則返回False 。
這個虛函數必須在子類中重新實現。
**See also** [setFileName](qabstractfileengine.html#setFileName)( )[remove](qabstractfileengine.html#remove)( )[mkdir](qabstractfileengine.html#mkdir)()和[isRelativePath](qabstractfileengine.html#isRelativePath)( ) 。
```
bool QAbstractFileEngine.seek (self, int?pos)
```
設置文件位置為給定的_offset_。返回True如果該位置被成功設置,否則返回False 。
偏移量是從文件的開始處,除非該文件是連續的。
**See also** [isSequential](qabstractfileengine.html#isSequential)( ) 。
```
QAbstractFileEngine.setError (self, QFile.FileError?error, QString?str)
```
設置錯誤類型_error_和錯誤字符串_errorString_。調用此函數來設置由更高級別的課程返回錯誤值。
**See also** [QFile.error](qfile.html#error)( )[QIODevice.errorString](qiodevice.html#errorString)()和[QIODevice.setErrorString](qiodevice.html#setErrorString)( ) 。
```
QAbstractFileEngine.setFileName (self, QString?file)
```
設置文件引擎的文件名_file_。這個文件名是虛函數,其馀將要操作的文件。
這個虛函數必須在子類中重新實現。
**See also** [fileName](qabstractfileengine.html#fileName)()和[rename](qabstractfileengine.html#rename)( ) 。
```
bool QAbstractFileEngine.setPermissions (self, int?perms)
```
該文件的權限設置為請求_perms_。該參數燙發將被設置為QAbstractFileEngine.FileInfo的或的結果結合在一起,只有[QAbstractFileEngine.PermsMask](qabstractfileengine.html#FileFlag-enum)的榮幸。如果操作succceeds返回True ,否則返回False ;
這個虛函數必須在子類中重新實現。
**See also** [size](qabstractfileengine.html#size)( ) 。
```
bool QAbstractFileEngine.setSize (self, int?size)
```
該文件被設置為請求的大小_size_。如果_size_比當前文件則填0的,如果小它只是截斷較大。如果操作succceeds返回True ,否則返回False ;
這個虛函數必須在子類中重新實現。
**See also** [size](qabstractfileengine.html#size)( ) 。
```
int QAbstractFileEngine.size (self)
```
返回文件的大小。
**See also** [setSize](qabstractfileengine.html#setSize)( ) 。
```
bool QAbstractFileEngine.unmap (self, sip.voidptr?ptr)
```
取消映射的內存_address_。返回True如果取消映射成功,否則返回False 。
該功能立足于調用它的行為[extension](qabstractfileengine.html#extension)( )與[UnMapExtensionOption](index.htm)。如果引擎不支持此擴展,則返回False。
此功能被引入Qt的4.4 。
**See also** [map](qabstractfileengine.html#map)()和[supportsExtension](qabstractfileengine.html#supportsExtension)( ) 。
```
int QAbstractFileEngine.write (self, str?data)
```
Writes _len_從字節_data_到文件中。返回寫入成功的字符數,否則返回-1 。
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