当前位置：文江博客知识库 en-US 文档 Mozilla Tech XPCOM Reference Interface nsIFileInputStream

nsIFileInputStream 编辑

netwerk/base/nsIFileStreams.idlScriptable An input stream that allows you to read from a file. Inherits from: nsIInputStream Last changed in Gecko 1.7

Method overview

void init(in nsIFile file, in long ioFlags, in long perm, in long behaviorFlags);

Constants

Constant	Value	Description
`DELETE_ON_CLOSE`	`1<<1`	If this is set, the file will be deleted by the time the stream is closed. It may be removed before the stream is closed if it is possible to delete it and still read from it. If OPEN_ON_READ is defined, and the file was recreated after the first delete, the file will be deleted again when it is closed again.
`CLOSE_ON_EOF`	`1<<2`	If this is set, the file will close automatically when the end of the file is reached.
`REOPEN_ON_REWIND`	`1<<3`	If this is set, the file will be reopened whenever Seek(0) occurs. If the file is already open and the seek occurs, it will happen naturally. (The file will only be reopened if it is closed for some reason.)
`DEFER_OPEN`	`1<<4`	If this is set, the file will be opened (i.e., a call to `PR_Open()` done) only when we do an actual operation on the stream, or more specifically, when one of the following is called: `Seek()` `Tell()` `Available()` `Read()` `ReadLine()` `DEFER_OPEN` is useful if we use the stream on a background thread, so that the opening and possible `stat`ing of the file happens there as well. Note: Using this flag results in the file not being opened during the call to `init`. This means that any errors that might happen when this flag is not set would happen during the first read. Also, the file is not locked when `init` is called, so it might be deleted before we try to read from it.

Methods

init()

void init(
  in nsIFile file,
  in long ioFlags,
  in long perm,
  in long behaviorFlags
);

Parameters

file: File to read from (must QI to nsILocalFile)
ioFlags: The file status flags define how the file is accessed. See PR_Open documentation for more details. If set to -1 the file will be opened in default mode (PR_RDONLY).
perm: File mode bits are described in the PR_Open documentation. If set to -1 the default value 0 will be used.
behaviorFlags: Flags specifying various behaviors of the class (see enumerations in the class).

nsIFileInputStream 编辑

Method overview

Constants

Methods

init()

Parameters

See also

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

词条统计

友情链接

nsIFileInputStream 编辑

Method overview

Constants

Methods

init()

Parameters

See also

如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

词条统计

友情链接

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。