File Utilities

Various file-related classes and functions. More...

Classes
class	Glib::FileError
	Exception class for file-related errors. More...
class	Glib::DirIterator
	The iterator type of Glib::Dir. More...
class	Glib::Dir
	Utility class representing an open directory. More...

Functions
bool	Glib::file_test (const std::string & filename, FileTest test)
	Returns true if any of the tests in the bitfield test are true. More...
int	Glib::mkstemp (std::string & filename_template)
	Opens a temporary file. More...
int	Glib::file_open_tmp (std::string & name_used, const std::string & prefix)
	Opens a file for writing in the preferred directory for temporary files (as returned by Glib::get_tmp_dir()). More...
int	Glib::file_open_tmp (std::string & name_used)
	Opens a file for writing in the preferred directory for temporary files (as returned by Glib::get_tmp_dir()). More...
std::string	Glib::file_get_contents (const std::string & filename)
	Reads an entire file into a string, with good error checking. More...

Detailed Description

Various file-related classes and functions.

Function Documentation

file_get_contents()

std::string Glib::file_get_contents

(

const std::string &

filename

)

Reads an entire file into a string, with good error checking.

Parameters

filename

A file to read contents from.

Returns

The file contents.

Exceptions

Glib::FileError

file_open_tmp() [1/2]

int Glib::file_open_tmp

(

std::string &

name_used

)

Opens a file for writing in the preferred directory for temporary files (as returned by Glib::get_tmp_dir()).

This function works like file_open_tmp(std::string&, const std::string&) but uses a default basename prefix.

Parameters

[out]

name_used

The actual name used.

Returns

A file handle (as from open()) to the file opened for reading and writing. The file is opened in binary mode on platforms where there is a difference. The file handle should be closed with close().

Exceptions

Glib::FileError

file_open_tmp() [2/2]

int Glib::file_open_tmp	(	std::string &	name_used,
		const std::string &	prefix
	)

Opens a file for writing in the preferred directory for temporary files (as returned by Glib::get_tmp_dir()).

prefix should a basename template; it'll be suffixed by 6 characters in order to form a unique filename. No directory components are allowed.

The actual name used is returned in name_used.

Parameters

[out]	name_used	The actual name used.
	prefix	Template for file name, basename only.

Returns

A file handle (as from open()) to the file opened for reading and writing. The file is opened in binary mode on platforms where there is a difference. The file handle should be closed with close().

Exceptions

Glib::FileError

file_test()

bool Glib::file_test	(	const std::string &	filename,
		FileTest	test
	)

Returns true if any of the tests in the bitfield test are true.

For example, (Glib::FILE_TEST_EXISTS | Glib::FILE_TEST_IS_DIR) will return true if the file exists; the check whether it's a directory doesn't matter since the existence test is true. With the current set of available tests, there's no point passing in more than one test at a time.

Apart from Glib::FILE_TEST_IS_SYMLINK all tests follow symbolic links, so for a symbolic link to a regular file file_test() will return true for both Glib::FILE_TEST_IS_SYMLINK and Glib::FILE_TEST_IS_REGULAR.

Note

For a dangling symbolic link file_test() will return true for Glib::FILE_TEST_IS_SYMLINK and false for all other flags.

Parameters

filename	A filename to test.
test	Bitfield of Glib::FileTest flags.

Returns

Whether a test was true.

mkstemp()

int Glib::mkstemp

(

std::string &

filename_template

)

Opens a temporary file.

See the mkstemp() documentation on most UNIX-like systems. This is a portability wrapper, which simply calls mkstemp() on systems that have it, and implements it in GLib otherwise.

Parameters

filename_template

A string that should match the rules for mkstemp(), i.e. end in "XXXXXX". The X string will be modified to form the name of a file that didn't exist.

Returns

A file handle (as from open()) to the file opened for reading and writing. The file is opened in binary mode on platforms where there is a difference. The file handle should be closed with close(). In case of errors, -1 is returned.