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What does binary stream mean?

anrxhzh 2002-05-30 11:51:23

#include <fstream>
#include <iterator>
#include <algorithm>
#include <iostream>

void main()
{
using namespace std;
copy( istream_iterator<char>( ifstream("sample.txt",ios_base::in | ios_base::binary) ),
istream_iterator<char>(),
ostream_iterator<char>( cout ) );
}
//为什么把换行符过滤掉了？

//sample.txt
//hello
//world

//output:
//helloworld

...全文

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切换为时间正序

当前发帖距今超过3年，不再开放新的回复

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alula 2002-07-14

原来如此！

吃饭去。

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Juventus 2002-07-14

捧场来了！！

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anrxhzh 2002-07-14

这个帖子是自问自答，如果一下子给别人几十分，有失公允。

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alula 2002-07-14

一定要捧场才可以结贴吗？

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anrxhzh 2002-07-14

乡亲们捧个场，俺准备散分了。

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anrxhzh 2002-07-13

noskipws is a manipulators.
关于 manipulators 的概念，请看：
http://www.dinkumware.com./htm_cpl/ios.html

skipws skip leading white space before certain extractions.
关于 white space 的概念，请看：
http://www.dinkumware.com./htm_cpl/ctype.html#isspace

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lizsss 2002-07-12

dev-c++ 5.0 结果正确!
麻烦说一下:istream_iterator<char>( ifstream("sample.txt",ios_base::in | ios_base::binary)>>noskipws ),
其中的"noskipws"以及">>"什么意思???

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anrxhzh 2002-07-12

哪位好心人顶一下，让俺把这个帖子结了。多谢了。

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zheng_can 2002-05-30

我记得可以设置 istream 的状态
方法与 setw() 类似
你去查查书看

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anrxhzh 2002-05-30

//我受调试结果的启发，终于搞定了。不过，真不知道说什么好，哎！
#include <fstream>
#include <iterator>
#include <algorithm>
#include <iostream>
#include <iomanip>

void main()
{
using namespace std;
copy( istream_iterator<char>( ifstream("sample.txt",ios_base::in | ios_base::binary)>>noskipws ),
istream_iterator<char>(),
ostream_iterator<char>( cout ) );
}
//the contents of sample.txt
//hello
//world

//output:
//hello
//world

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anrxhzh 2002-05-30

你指的是setiosflags吧，我试了一下，没有用。

我跟踪了一下，在<istream>中的这条语句_Fac.is(_Ctype::space,_Tr::to_char_type(_C))把换行符过滤掉了。
bool ipfx(bool _Noskip = false)
{if (good())
{if (tie() != 0)
tie()->flush();
if (!_Noskip && flags() & skipws)
{const _Ctype& _Fac = _USE(getloc(), _Ctype);
_TRY_IO_BEGIN
int_type _C = rdbuf()->sgetc();
while (!_Tr::eq_int_type(_Tr::eof(), _C)
&& _Fac.is(_Ctype::space,
_Tr::to_char_type(_C)))
_C = rdbuf()->snextc();
_CATCH_IO_END }
if (good())
return (true); }
setstate(failbit);
return (false); }

"The actual values of openmodes and their meanings are implementation-defined." -TCPL 21.5.1
November 1997 Draft Standard 中对此也没有提及。
依然不解。
我是在VC6.0下测试的，我用IBM VisualAge和Cygwin gcc都编译不过，有条件的朋友用其他编译器试试吧。

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