CRLF end of line and ostringstream

c++ newline ostringstream
JMD picture JMD · Mar 29, 2011 · Viewed 15.5k times · Source

I am trying to use a ostringstream to build a string which uses the platform standard line endings (so for me it is CRLF since I am developing for Windows). I tried the following code:

std::ostringstream out;
out << "line1\nline2\n";
const char* result = out.str().c_str(); // In result end of lines are '\n' instead
                                        // of the expected '\r\n'

Since ostringstream is opened by default in text mode, I thought it would perform the end of line conversion (like an ofstream) but the resulting char buffer does not contain the expected CRLF end of lines....

Edit:

For those who wondered why I needed the CRLF ending internally: I copy the text into the Windows clipboard and user often copy that content to Notepad and without the CRLF ending the end of lines are lost during that last operation....

My solution:

Finally I decided to use the boost library to replace \n with \r\n:

boost::replace_all( str, "\n", "\r\n" );

Answer

Bo Persson picture Bo Persson · Mar 29, 2011

Well, '\n' is the internal representation for end-of-line.

It is just when you write to an external file that it is converted (if needed!) to the external representation. On some systems the line ending is just one character, or even no character at all if stored with a hidden length value instead.

Related questions

Press Enter to Continue

This doesn't work: string temp; cout << "Press Enter to Continue"; cin >> temp;

Read More
using fstream to read every character including spaces and newline

I wanted to use fstream to read a txt file. I am using inFile >> characterToConvert, but the problem is that this omits any spaces and newline. I am writing an encryption program so I need to include the …

Read More
How to append text to QPlainTextEdit without adding newline, and keep scroll at the bottom?

I need to append text to QPlainTextEdit without adding a newline to the text, but both methods appendPlainText() and appendHtml() adds actually new paragraph. I can do that manually with QTextCursor: QTextCursor text_cursor = QTextCursor(my_plain_text_edit->…

Read More