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Chapter 10. Streams and Files
Recipe 10.1.  Lining Up Text Output
Recipe 10.2.  Formatting Floating-Point Output
Recipe 10.3.  Writing Your Own Stream Manipulators
Recipe 10.4.  Making a Class Writable to a Stream
Recipe 10.5.  Making a Class Readable from a Stream
Recipe 10.6.  Getting Information About a File
Recipe 10.7.  Copying a File
Recipe 10.8.  Deleting or Renaming a File
Recipe 10.9.  Creating a Temporary Filename and File
Recipe 10.10.  Creating a Directory
Recipe 10.11.  Removing a Directory
Recipe 10.12.  Reading the Contents of a Directory
Recipe 10.13.  Extracting a File Extension from a String
Recipe 10.14.  Extracting a Filename from a Full Path
Recipe 10.15.  Extracting a Path from a Full Path and Filename
Recipe 10.16.  Replacing a File Extension
Recipe 10.17.  Combining Two Paths into a Single Path
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Streams are one of the most powerful (and complicated) components of the C++ standard library. Using
them for plain, unformatted input and output is generally straightforward, but changing the format to suit
your needs with standard manipulators, or writing your own manipulators, is not. Therefore, the first few
recipes describe different ways to format stream output. The two after that describe how to write objects
of a class to a stream or read them from one.
Then the recipes shift from reading and writing file content to operating on the files themselves (and
directories). If your program uses files, especially if it's a daemon or server-side process, you will
probably create files and directories, clean them up, rename them, and so on. There are a number of
recipes that explain how to do these unglamorous, but necessary, tasks in C++.
The last third of the recipes demonstrate how to manipulate file and pathnames themselves using many of
the standard string member functions. Standard strings contain an abundance of functions for inspecting
and manipulating their contents, and if you have to parse path and filenames they come in handy. If what
you need is not discussed in these recipes, take a look at Chapter 7
, toowhat you're after might be
described there.
File manipulation requires direct interaction with the operating system (OS), and there are often subtle
differences (and occasionally glaring incompatibilities) between OSs. Many of the typical file and
directory manipulation needs are part of the standard C system calls, and work the same or similarly on
different systems. Where there are differences between OSs' versions of libraries, I note it in the recipes.
As I have discussed in previous chapters, Boost is an open source project that has generated a number
of high-quality, portable libraries. But since this is a book about C++ and not the Boost project, I have
preferred standard C++ solutions whenever possible. In many cases, however, (most notably Recipe
) there isn't a Standard C++ solution, so I have used the Boost Filesystem library written by Beman
Dawes, which provides a portable filesystem interface, to give a portable solution. Take a look at the
Boost Filesystem library if you have to do portable filesystem interactionyou will save yourself lots of time
and effort. For more information on the Boost project, see
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Recipe 10.1. Lining Up Text Output
You need to line up your text output vertically. For example, if you are exporting tabular data, you may
want it to look like this:
Jim            Willcox         Mesa           AZ
Bill           Johnson         San Mateo      CA
Robert         Robertson       Fort Collins   CO
You will probably also want to be able to right- or left-justify the text.
Use ostream or wostream, for narrow or wide characters, defined in <ostream>, and the standard
stream manipulators to set the field width and justify the text. Example 10-1
shows how.
Example 10-1. Lining up text output
#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
int main( ) {
ios_base::fmtflags flags = cout.flags( );
string first, last, citystate;
int width = 20;
first = "Richard";
last  = "Stevens";
citystate = "Tucson, AZ";
cout << left                      // Left-justify in each field
<< setw(width) << first      // Then, repeatedly set the width
<< setw(width) << last       // and write some data
<< setw(width) << citystate << endl;
The output looks like this:
Richard             Stevens             Tucson, AZ
A manipulator is a function that operates on a stream. Manipulators are applied to a stream with
operator<<. The stream's format (input or output) is controlled by a set of flags and settings on the
ultimate base stream class, ios_base. Manipulators exist to provide convenient shorthand for adjusting
these flags and settings without having to explicitly set them via setf or flags, which is cumbersome to
write and ugly to read. The best way to format stream output is to use manipulators.
Example 10-1
uses two manipulators to line up text output into columns. The manipulator setw sets the
field width, and left left-justifies the value within that field (the counterpart to left is, not surprisingly, right).
A "field" is just another way of saying that you want the output to be padded on one side or the other to
make sure that the value you write is the only thing printed in that field. If, as in Example 10-1
, you
left-justify a value, then set the field width, the next thing you write to the stream will begin with the first
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Recipe 10.2. Formatting Floating-Point Output
You need to present floating-point output in a well-defined format, either for the sake of precision
(scientific versus fixed-point notation) or simply to line up decimal points vertically for easier reading.
Use the standard manipulators provided in <iomanip> and <ios> to control the format of floating-point
values that are written to the stream. There are too many combinations of ways to cover here, but
Example 10-3
offers a few different ways to display the value of pi.
Example 10-3. Formatting pi
#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
int main( ) {
ios_base::fmtflags flags =  // Save old flags
cout.flags( );
double pi = 3.14285714;
cout << "pi = " << setprecision(5)  // Normal (default) mode; only
<< pi << '\n';                 // show 5 digits, including both
// sides of decimal point.
cout << "pi = " << fixed            // Fixed-point mode;
<< showpos                     // show a "+" for positive nums,
<< setprecision(3)             // show 3 digits to the *right*
<< pi << '\n';                 // of the decimal.
cout << "pi = " << scientific       // Scientific mode; 
<< noshowpos                   // don't show plus sign anymore
<< pi * 1000 << '\n';
cout.flags(flags);  // Set the flags to the way they were
This will produce the following output:
pi = 3.1429
pi = +3.143
pi = 3.143e+003
Manipulators that specifically manipulate floating-point output divide into two categories. There are those
that set the format, which, for the purposes of this recipe, set the general appearance of floating-point and
integer values, and there are those that fine-tune the display of each format. The formats are as follows:
Normal (the default)
In this format, the number of digits displayed is fixed (with a default of six) and the decimal is displayed
such that only a set number of digits are displayed at one time. So, by default, pi would be displayed as
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