OpenShot Audio Library | OpenShotAudio: juce::TemporaryFile Class Reference

OpenShot Audio Library | OpenShotAudio 0.6.0

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juce::TemporaryFile Class Reference

`#include <juce_TemporaryFile.h>`

## Public Types
enum | OptionFlags { useHiddenFile = 1 , putNumbersInBrackets = 2 }

## Public Member Functions
| TemporaryFile (const String &suffix=String(), int optionFlags=0)
| TemporaryFile (const File &targetFile, int optionFlags=0)
| TemporaryFile (const File &targetFile, const File &temporaryFile)
| ~TemporaryFile ()
const File & | getFile () const noexcept
const File & | getTargetFile () const noexcept
bool | overwriteTargetFileWithTemporary () const
bool | deleteTemporaryFile () const

## Detailed Description

Manages a temporary file, which will be deleted when this object is deleted.

This object is intended to be used as a stack based object, using its scope to make sure the temporary file isn't left lying around.

For example:

{
File myTargetFile ("~/myfile.txt");
// this will choose a file called something like "~/myfile_temp239348.txt"
// which definitely doesn't exist at the time the constructor is called.
TemporaryFile temp (myTargetFile);
// create a stream to the temporary file, and write some data to it...
if (auto out = std::unique_ptr<FileOutputStream> (temp.getFile().createOutputStream()))
{
out->write ( ...etc )
out.reset(); // (deletes the stream)
// ..now we've finished writing, this will rename the temp file to
// make it replace the target file we specified above.
bool succeeded = temp.overwriteTargetFileWithTemporary();
}
// ..and even if something went wrong and our overwrite failed,
// as the TemporaryFile object goes out of scope here, it'll make sure
// that the temp file gets deleted.
}
juce::File
Definition juce_File.h:45
juce::TemporaryFile::TemporaryFile
TemporaryFile(const String &suffix=String(), int optionFlags=0)
Definition juce_TemporaryFile.cpp:52

See also
  File, FileOutputStream

Definition at line 64 of file juce_TemporaryFile.h.

## Member Enumeration Documentation

## ◆ OptionFlags

enum juce::TemporaryFile::OptionFlags

Enumerator
useHiddenFile | Indicates that the temporary file should be hidden - i.e. its name should start with a dot.
putNumbersInBrackets | Indicates that when numbers are appended to make sure the file is unique, they should go in brackets rather than just being appended (see File::getNonexistentSibling() )

Definition at line 68 of file juce_TemporaryFile.h.

## Constructor & Destructor Documentation

## ◆ TemporaryFile() [1/3]

juce::TemporaryFile::TemporaryFile | ( | const String & | suffix = String(),
|  | int | optionFlags = 0 )

Creates a randomly-named temporary file in the default temp directory.

Parameters

  suffix | a file suffix to use for the file
  optionFlags | a combination of the values listed in the OptionFlags enum The file will not be created until you write to it. And remember that when this object is deleted, the file will also be deleted!

Definition at line 52 of file juce_TemporaryFile.cpp.

## ◆ TemporaryFile() [2/3]

juce::TemporaryFile::TemporaryFile | ( | const File & | targetFile,
|  | int | optionFlags = 0 )

Creates a temporary file in the same directory as a specified file.

This is useful if you have a file that you want to overwrite, but don't want to harm the original file if the write operation fails. You can use this to create a temporary file next to the target file, then write to the temporary file, and finally use overwriteTargetFileWithTemporary() to replace the target file with the one you've just written.

This class won't create any files until you actually write to them. And remember that when this object is deleted, the temporary file will also be deleted!

Parameters

  targetFile | the file that you intend to overwrite - the temporary file will be created in the same directory as this
  optionFlags | a combination of the values listed in the OptionFlags enum

Definition at line 60 of file juce_TemporaryFile.cpp.

## ◆ TemporaryFile() [3/3]

juce::TemporaryFile::TemporaryFile | ( | const File & | targetFile,
|  | const File & | temporaryFile )

Creates a temporary file using an explicit filename. The other constructors are a better choice than this one, unless for some reason you need to explicitly specify the temporary file you want to use.

Parameters

  targetFile | the file that you intend to overwrite
  temporaryFile | the temporary file to be used

Definition at line 71 of file juce_TemporaryFile.cpp.

## ◆ ~TemporaryFile()

juce::TemporaryFile::~TemporaryFile | ( |  | ) |

Destructor.

When this object is deleted it will make sure that its temporary file is also deleted! If the operation fails, it'll throw an assertion in debug mode.

Definition at line 76 of file juce_TemporaryFile.cpp.

## Member Function Documentation

## ◆ deleteTemporaryFile()

bool juce::TemporaryFile::deleteTemporaryFile | ( |  | ) | const

Attempts to delete the temporary file, if it exists.

Returns
  true if the file is successfully deleted (or if it didn't exist).

Definition at line 120 of file juce_TemporaryFile.cpp.

Referenced by ~TemporaryFile().

## ◆ getFile()

const File & juce::TemporaryFile::getFile | ( |  | ) | const
| inlinenoexcept

Returns the temporary file.

Definition at line 126 of file juce_TemporaryFile.h.

Referenced by juce::File::replaceWithData(), juce::File::replaceWithText(), juce::FileLogger::trimFileSize(), and juce::XmlElement::writeTo().

## ◆ getTargetFile()

const File & juce::TemporaryFile::getTargetFile | ( |  | ) | const
| inlinenoexcept

Returns the target file that was specified in the constructor.

Definition at line 129 of file juce_TemporaryFile.h.

## ◆ overwriteTargetFileWithTemporary()

bool juce::TemporaryFile::overwriteTargetFileWithTemporary | ( |  | ) | const

Tries to move the temporary file to overwrite the target file that was specified in the constructor.

If you used the constructor that specified a target file, this will attempt to replace that file with the temporary one.

Before calling this, make sure:

- that you've actually written to the temporary file
- that you've closed any open streams that you were using to write to it
- and that you don't have any streams open to the target file, which would prevent it being overwritten

If the file move succeeds, this returns true, and the temporary file will have disappeared. If it fails, the temporary file will probably still exist, but will be deleted when this object is destroyed.

Definition at line 93 of file juce_TemporaryFile.cpp.

Referenced by juce::File::replaceWithData(), juce::File::replaceWithText(), juce::FileLogger::trimFileSize(), and juce::XmlElement::writeTo().

The documentation for this class was generated from the following files:

- juce_TemporaryFile.h
- juce_TemporaryFile.cpp