ios :: app和ios :: ate之间的区别 [英] Difference between ios::app and ios::ate
问题描述
Possible Duplicate:
C++ Filehandling: Difference between ios:app and ios:ate?
这两种文件打开模式之间有什么区别？
What is the difference between these two file opening modes ?
ios：ate将get / put指针位置设置为文件末尾= >读/写将
从结束开始，但它是如何不同于ios :: app，它再次打开一个附加模式下的文件...但是当我创建了一个stream并打开它在ios：app模式，put stream指针仍然指向开始，那么附加工作怎么样呢？
ios:ate sets the get/put pointer position to the end of the file => reading/writing will begin from end, but how is it different from ios::app, which again opens a file in append mode...but when I have created a ofstream and opened it in ios:app mode, the put stream pointer still points to the beginning, how does the appending work then ?
我也理解ifstream，stream和fstream是高级类来管理底层流缓冲器。
Also I understand that ifstream, ofstream and fstream are high level classes to manage the underlying stream buffer. So does it mean that even in ios:app mode i can read data from a file ?
推荐答案
app 来自'append'，所有输出将被添加（附加）到文件的末尾。
app comes from 'append'- all output will be added (appended) to the end of the file. In other words you cannot write anywhere else in the file but at the end
ate 来自end - 当您打开文件时，它会在文件末尾设置流位置，但您可以随意移动它（寻找），并随意写入。
ate come form 'at end' - it sets the stream position at the end of the file when you open it but you are free to move it around (seek) and write wherever it pleases you.
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