输出到2个流 [英] output to 2 streams

问题描述

我的程序输出到cout，我也希望它输出到LOG文件。

有一个简单的方法吗？


弗雷泽。

My program outputs to cout and I want it to output to a LOG file as well.
Is there a simple way to do that?

Fraser.

推荐答案

" Fraser Ross" < fraserATmembers.v21.co.unitedkingdom>在消息中写道

"Fraser Ross" <fraserATmembers.v21.co.unitedkingdom> wrote in message

我的程序输出到cout，我也希望它输出到LOG文件。
有一个简单的方法吗？

My program outputs to cout and I want it to output to a LOG file as well.
Is there a simple way to do that?

这个简单的方法怎么样 -

std :: ofstream out1（" xxx.log"）;

.. ..

std :: cout<< 记录和打印的东西;

out1<< 记录和打印的东西;


您也可以使用Macro技巧来完成这项工作，例如 -


#define PRINT （xxx）std :: cout<< 记录和打印的东西; \

out1<< 记录和打印的东西;


int main（）

{

//...

PRINT（要打印的东西）;


}


-Sharad

How about this simple way -
std::ofstream out1("xxx.log");
....
std::cout << "Something to log and print";
out1 << "Something to log and print";

You could also use Macro trick to get this done, something like -

#define PRINT(xxx) std::cout << "Something to log and print"; \
out1 << "Something to log and print";

int main()
{
//...
PRINT ("Something to print");

}

-Sharad

这样做了，比如 -

this done, something like -

#define PRINT（xxx）std :: cout<< 记录和打印的东西; \
out1<< 记录和打印的东西;

#define PRINT(xxx) std::cout << "Something to log and print"; \
out1 << "Something to log and print";

应该是 -


#define PRINT（xxx）std :: cout<< XXX; \

out1<< xxx;

Should be --

#define PRINT(xxx) std::cout << xxx; \
out1 << xxx;

可以从

ostringstream构造ostream_iterator或ostreambuf_iterator吗？例如：

std :: ostringstream oStr;

std :: ostream_iterator it（oStr）;


basic_ostringstream继承自basic_ostream。 ostream_iterator有一个带有basic_ostream的

构造函数。


Fraser。

Can a ostream_iterator or ostreambuf_iterator be constructed from a
ostringstream? E.g.:
std::ostringstream oStr;
std::ostream_iterator it(oStr);

basic_ostringstream inherits from basic_ostream. ostream_iterator has a
constructor taking a basic_ostream.

Fraser.

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