# Poco

# class FileInputStream

Library: Foundation
Package: Streams
Header: Poco/FileStream.h

## Description

An input stream for reading from 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 InputLineEndingConverter if you require CR-LF translation.

On Windows platforms, UTF-8 encoded Unicode paths are correctly handled.

## Inheritance

Direct Base Classes: FileIOS, std::istream

All Base Classes: FileIOS, std::ios, std::istream

## Member Summary

Member Functions: open

Inherited Functions: close, flushToDisk, nativeHandle, open, openHandle, rdbuf, size

## Constructors

### FileInputStream

FileInputStream();

Creates an unopened FileInputStream.

### FileInputStream

FileInputStream(
const std::string & path,
std::ios::openmode mode = std::ios::in
);

Creates the FileInputStream for the file given by path, using the given mode.

The std::ios::in flag is always set, regardless of the actual value specified for mode.

Throws a FileNotFoundException (or a similar exception) if the file does not exist or is not accessible for other reasons.

## Destructor

### ~FileInputStream

~FileInputStream() override;

Destroys the stream.

## Member Functions

### open

void open(
const std::string & path,
std::ios::openmode mode = std::ios::in
) override;

Opens the file specified by path, using the given mode, which will always include std::ios::in (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.

See also: Poco::FileIOS::open()