Library: Foundation
Package: Streams
Header: Poco/FileStream.h
Description
An output stream for writing to a file.
Files are always opened in binary mode, a text mode with CR-LF translation is not supported. Thus, the file is always opened as if the std::ios::binary flag was specified. Use an OutputLineEndingConverter if you require CR-LF translation.
On Windows platforms, UTF-8 encoded Unicode paths are correctly handled.
Inheritance
Direct Base Classes: FileIOS, std::ostream
All Base Classes: FileIOS, std::ios, std::ostream
Member Summary
Member Functions: open
Inherited Functions: close, flushToDisk, nativeHandle, open, openHandle, rdbuf, size
Constructors
FileOutputStream
Creats an unopened FileOutputStream.
FileOutputStream
FileOutputStream(
const std::string & path,
std::ios::openmode mode = std::ios::out | std::ios::trunc
);
Creates the FileOutputStream for the file given by path, using the given mode.
The std::ios::out is always set, regardless of the actual value specified for mode.
Throws a FileException (or a similar exception) if the file does not exist or is not accessible for other reasons and a new file cannot be created.
NOTE: The default mode std::ios::out | std::ios::trunc is different from the default for std::ofstream, which is std::ios::out only. This is for backwards compatibility with earlier POCO versions.
Destructor
~FileOutputStream
~FileOutputStream() override;
Destroys the FileOutputStream.
Member Functions
open 
void open(
const std::string & path,
std::ios::openmode mode = std::ios::out | std::ios::trunc
) override;
Opens the file specified by path, using the given mode, which always includes std::ios::out, even if not specified.
Throws a FileException (or a similar exception) if the file does not exist or is not accessible for other reasons and a new file cannot be created.
NOTE: The default mode std::ios::out | std::ios::trunc is different from the default for std::ostream, which is std::ios::out only. This is for backwards compatibility with earlier POCO versions.
See also: Poco::FileIOS::open()