Formatted output to file just like printf does

Question

Is it possible to set format of the output to file so I could write to file like printf writes to console?

printf("%s\\\n", "something");

std::ofstream myfile;
myfile.open ("somefile", ofstream::in | ofstream::out | ofstream::app); //debug
myfile << ""; // can I use somehow pattern like %s?

I would like to do something like ""\\x%02x\n" what you will do?! — deepspace, Jul 23 '13 at 15:35
@matsuoka, `"\" << std::hex() << std::setw(2) << std::setfill('0') << number << std::endl` — nothrow, Jul 23 '13 at 15:36
It is usually considered wise to ask not only with the question, but also with use-case for your question. Sometimes stackoverflow may provide you with overall better solution, knowing the context. — nothrow, Jul 23 '13 at 15:39

score 2 · Answer 1 · answered Jul 23 '13 at 15:36

2

fprintf(FILE*, ....)

but it isn't wise to mix and match. Use new-style streams wherever possible.

http://www.cplusplus.com/reference/ios/ios_base/setf/

answered Jul 23 '13 at 15:36

Mayur Patel

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score 1 · Answer 2 · answered Jul 23 '13 at 15:40

1

If you're looking for a printf-like solution in C++, I'd suggest Boost.Format library:

myfile << boost::format("%s\\\n") % "something";

answered Jul 23 '13 at 15:40

awesoon

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score 0 · Answer 3 · answered Jul 23 '13 at 15:40

0

Have you tried Boost.Format, it uses printf() compatible format strings.

answered Jul 23 '13 at 15:40

Johny

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Formatted output to file just like printf does

3 Answers3