在C ++中打开文件时如何设置文件权限? [英] How do I set file permissions when opening a file in C++?

问题描述

在C ++中，我想打开一个文件并设置其权限，但是失败了.下面是我的程序:

In C++, I want to open a file and set its permission, but I failed. Below is my program:

string filename="test.cnf";
ofstream ofile;
ofile.open(filename.c_str(),O_RDONLY);
ofile.close()

但是出现以下错误:

error: invalid conversion from 'int' to 'std::_Ios_Openmode'

error:   initializing argument 2 of 'void std::basic_ofstream<_CharT, _Traits>::open(const char*, std::_Ios_Openmode) [with _CharT = char, _Traits = std::char_traits<char>]'

如何将文件的权限设置为例如644、700?

How to set the permission of the file to such as 644, 700?

推荐答案

fstream 没有 O_RDONLY 模式.您应使用以下一种:

There is not O_RDONLY mode for fstream. You should use one of:

1. ios :: app
2. ios :: binary
3. ios :: ate
4. ios :: in
5. ios :: out
6. ios :: trunc

1. ios::app
2. ios::binary
3. ios::ate
4. ios::in
5. ios::out
6. ios::trunc

或其组合(例如 ios :: app | ios :: binary ).对于您的情况，您应该使用 ios :: in (也许使用 ios :: binary ).有关更多详细信息，请参见此.

Or their combinations (say ios::app | ios::binary). For your case you should use ios::in (maybe with ios::binary). Look at this for more details.

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