\inmodule QtCore More...

#include <qmimetype.h>

Collaboration diagram for QMimeType:

Public Member Functions
	QMimeType ()
	Constructs this QMimeType object initialized with default property values that indicate an invalid MIME type.

	QMimeType (const QMimeType &other)
	Constructs this QMimeType object as a copy of other.

QMimeType &	operator= (const QMimeType &other)
	Move-assigns other to this QMimeType instance.

void	swap (QMimeType &other) noexcept
	Swaps QMimeType other with this QMimeType object.

	QMimeType (const QMimeTypePrivate &dd)
	Assigns the data of the QMimeTypePrivate dd to this QMimeType object, and returns a reference to this object.

	~QMimeType ()
	Destroys the QMimeType object, and releases the d pointer.

bool	operator== (const QMimeType &other) const
	Returns `true` if other equals this QMimeType object, otherwise returns `false`.

bool	operator!= (const QMimeType &other) const
	Returns `true` if other does not equal this QMimeType object, otherwise returns `false`.

bool	isValid () const

bool	isDefault () const

QString	name () const

QString	comment () const

QString	genericIconName () const

QString	iconName () const

QStringList	globPatterns () const

QStringList	parentMimeTypes () const

QStringList	allAncestors () const

QStringList	aliases () const

QStringList	suffixes () const

QString	preferredSuffix () const

Q_INVOKABLE bool	inherits (const QString &mimeTypeName) const
	Returns `true` if this mimetype is mimeTypeName, or inherits mimeTypeName (see parentMimeTypes()), or mimeTypeName is an alias for this mimetype.

QString	filterString () const

Protected Attributes
QExplicitlySharedDataPointer< QMimeTypePrivate >	d

Properties
bool	valid
	`true` if the QMimeType object contains valid data, `false` otherwise

bool	isDefault
	`true` if this MIME type is the default MIME type which applies to all files: application/octet-stream.

QString	name
	the name of the MIME type

QString	comment
	the description of the MIME type to be displayed on user interfaces

QString	genericIconName
	the file name of a generic icon that represents the MIME type

QString	iconName
	the file name of an icon image that represents the MIME type

QStringList	globPatterns
	the list of glob matching patterns

QStringList	parentMimeTypes
	the names of parent MIME types

QStringList	allAncestors
	the names of direct and indirect parent MIME types

QStringList	aliases
	the list of aliases of this mimetype

QStringList	suffixes
	the known suffixes for the MIME type

QString	preferredSuffix
	the preferred suffix for the MIME type

QString	filterString
	a filter string usable for a file dialog

Friends
class	QMimeTypeParserBase

class	MimeTypeMapEntry

class	QMimeDatabasePrivate

class	QMimeXMLProvider

class	QMimeBinaryProvider

class	QMimeTypePrivate

Q_CORE_EXPORT size_t	qHash (const QMimeType &key, size_t seed) noexcept

Related Symbols
(Note that these are not member symbols.)
size_t	qHash (const QMimeType &key, size_t seed) noexcept

Detailed Description

\inmodule QtCore

The QMimeType class describes types of file or data, represented by a MIME type string.

Since: 5.0

For instance a file named "readme.txt" has the MIME type "text/plain". The MIME type can be determined from the file name, or from the file contents, or from both. MIME type determination can also be done on buffers of data not coming from files.

Determining the MIME type of a file can be useful to make sure your application supports it. It is also useful in file-manager-like applications or widgets, in order to display an appropriate \l {QMimeType::iconName}{icon} for the file, or even the descriptive \l {QMimeType::comment()}{comment} in detailed views.

To check if a file has the expected MIME type, you should use inherits() rather than a simple string comparison based on the name(). This is because MIME types can inherit from each other: for instance a C source file is a specific type of plain text file, so text/x-csrc inherits text/plain.

See also: QMimeDatabase, {MIME Type Browser Example}

Definition at line 24 of file qmimetype.h.

Constructor & Destructor Documentation

◆ QMimeType() [1/3]

QMimeType::QMimeType ( )

Constructs this QMimeType object initialized with default property values that indicate an invalid MIME type.

Definition at line 88 of file qmimetype.cpp.

◆ QMimeType() [2/3]

QMimeType::QMimeType ( const QMimeType & other )

Constructs this QMimeType object as a copy of other.

Definition at line 97 of file qmimetype.cpp.

◆ QMimeType() [3/3]

QMimeType::QMimeType ( const QMimeTypePrivate & dd )

explicit

Assigns the data of the QMimeTypePrivate dd to this QMimeType object, and returns a reference to this object.

Definition at line 118 of file qmimetype.cpp.

◆ ~QMimeType()

QMimeType::~QMimeType ( )

Destroys the QMimeType object, and releases the d pointer.

Definition at line 139 of file qmimetype.cpp.

Member Function Documentation

◆ aliases()

QStringList QMimeType::aliases ( ) const

Definition at line 394 of file qmimetype.cpp.

References d, QMimeDatabasePrivate::instance(), QMimeDatabasePrivate::listAliases(), and QMimeTypePrivate::name.

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◆ allAncestors()

QStringList QMimeType::allAncestors ( ) const

Definition at line 372 of file qmimetype.cpp.

References collectParentMimeTypes(), d, and QMimeTypePrivate::name.

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◆ comment()

QString QMimeType::comment ( ) const

Definition at line 220 of file qmimetype.cpp.

References d, QString::indexOf(), QMimeDatabasePrivate::instance(), QString::isEmpty(), QString::left(), QMimeDatabasePrivate::loadMimeTypePrivate(), QMimeTypePrivate::localeComments, QMimeTypePrivate::name, QLocale::name(), pos, QLocale::uiLanguages(), and QHash< Key, T >::value().

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◆ filterString()

QString QMimeType::filterString ( ) const

Definition at line 451 of file qmimetype.cpp.

References comment, d, QMimeTypePrivate::globPatterns, i, QMimeDatabasePrivate::instance(), and QMimeDatabasePrivate::loadMimeTypePrivate().

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◆ genericIconName()

QString QMimeType::genericIconName ( ) const

Definition at line 261 of file qmimetype.cpp.

References d, QMimeTypePrivate::genericIconName, QStringView::indexOf(), QMimeDatabasePrivate::instance(), QString::isEmpty(), QStringView::left(), QMimeDatabasePrivate::loadGenericIcon(), and name.

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◆ globPatterns()

QStringList QMimeType::globPatterns ( ) const

Definition at line 313 of file qmimetype.cpp.

References d, QMimeTypePrivate::globPatterns, QMimeDatabasePrivate::instance(), and QMimeDatabasePrivate::loadMimeTypePrivate().

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◆ iconName()

QString QMimeType::iconName ( ) const

Definition at line 297 of file qmimetype.cpp.

References d, QMimeTypePrivate::iconName, QMimeDatabasePrivate::instance(), QString::isEmpty(), QMimeDatabasePrivate::loadIcon(), make_default_icon_name_from_mimetype_name(), and name.

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◆ inherits()

bool QMimeType::inherits ( const QString & mimeTypeName ) const

Returns true if this mimetype is mimeTypeName, or inherits mimeTypeName (see parentMimeTypes()), or mimeTypeName is an alias for this mimetype.

This method has been made invokable from QML since 5.10.

Definition at line 477 of file qmimetype.cpp.

References d, QMimeDatabasePrivate::instance(), QMimeDatabasePrivate::mimeInherits(), and QMimeTypePrivate::name.

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◆ isDefault()

bool QMimeType::isDefault ( ) const

Definition at line 194 of file qmimetype.cpp.

References d, QMimeDatabasePrivate::defaultMimeType(), QMimeDatabasePrivate::instance(), and QMimeTypePrivate::name.

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◆ isValid()

bool QMimeType::isValid ( ) const

Definition at line 181 of file qmimetype.cpp.

References d, QString::isEmpty(), and QMimeTypePrivate::name.

Referenced by QMimeDatabasePrivate::findByData(), and QMimeDatabasePrivate::mimeTypeForFileNameAndData().

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◆ name()

QString QMimeType::name ( ) const

Definition at line 206 of file qmimetype.cpp.

References d, and QMimeTypePrivate::name.

◆ operator!=()

bool QMimeType::operator!= ( const QMimeType & other ) const

inline

Returns true if other does not equal this QMimeType object, otherwise returns false.

Definition at line 55 of file qmimetype.h.

References operator==(), and other().

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◆ operator=()

QMimeType & QMimeType::operator= ( const QMimeType & other )

Move-assigns other to this QMimeType instance.

Assigns the data of other to this QMimeType object, and returns a reference to this object.

Since: 5.2

Definition at line 106 of file qmimetype.cpp.

References d, and other().

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◆ operator==()

bool QMimeType::operator== ( const QMimeType & other ) const

Returns true if other equals this QMimeType object, otherwise returns false.

The name is the unique identifier for a mimetype, so two mimetypes with the same name, are equal.

Definition at line 149 of file qmimetype.cpp.

References d, QMimeTypePrivate::name, and other().

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◆ parentMimeTypes()

QStringList QMimeType::parentMimeTypes ( ) const

Definition at line 337 of file qmimetype.cpp.

References d, QMimeDatabasePrivate::instance(), QMimeDatabasePrivate::mimeParents(), and QMimeTypePrivate::name.

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◆ preferredSuffix()

QString QMimeType::preferredSuffix ( ) const

Definition at line 436 of file qmimetype.cpp.

References isDefault, and suffixes.

◆ suffixes()

QStringList QMimeType::suffixes ( ) const

Definition at line 408 of file qmimetype.cpp.

References QString::append(), d, QMimeTypePrivate::globPatterns, QMimeDatabasePrivate::instance(), QMimeDatabasePrivate::loadMimeTypePrivate(), and QString::mid().

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◆ swap()

void QMimeType::swap ( QMimeType & other )

inlinenoexcept

Swaps QMimeType other with this QMimeType object.

This operation is very fast and never fails.

The swap() method helps with the implementation of assignment operators in an exception-safe way. For more information consult \l {http://en.wikibooks.org/wiki/More_C++_Idioms/Copy-and-swap} {More C++ Idioms - Copy-and-swap}.

Definition at line 46 of file qmimetype.h.

References d, and other().

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Friends And Related Symbol Documentation

◆ MimeTypeMapEntry

friend class MimeTypeMapEntry

friend

Definition at line 81 of file qmimetype.h.

◆ qHash() [1/2]

size_t qHash	(	const QMimeType &	key,
		size_t	seed
	)

Since: 5.6

Returns the hash value for key, using seed to seed the calculation.

Definition at line 161 of file qmimetype.cpp.

◆ qHash [2/2]

size_t qHash	(	const QMimeType &	key,
		size_t	seed = `0`
	)

friend

Since: 5.6

Returns the hash value for key, using seed to seed the calculation.

Definition at line 161 of file qmimetype.cpp.

◆ QMimeBinaryProvider

friend class QMimeBinaryProvider

friend

Definition at line 84 of file qmimetype.h.

◆ QMimeDatabasePrivate

friend class QMimeDatabasePrivate

friend

Definition at line 82 of file qmimetype.h.

◆ QMimeTypeParserBase

friend class QMimeTypeParserBase

friend

Definition at line 80 of file qmimetype.h.

◆ QMimeTypePrivate

friend class QMimeTypePrivate

friend

Definition at line 85 of file qmimetype.h.

◆ QMimeXMLProvider

friend class QMimeXMLProvider

friend

Definition at line 83 of file qmimetype.h.

Member Data Documentation

◆ d

QExplicitlySharedDataPointer<QMimeTypePrivate> QMimeType::d

protected

Definition at line 88 of file qmimetype.h.

Referenced by QMimeXMLProvider::addMimeType(), aliases(), allAncestors(), comment(), filterString(), genericIconName(), globPatterns(), iconName(), inherits(), isDefault(), isValid(), name(), operator=(), operator==(), parentMimeTypes(), and suffixes().

Property Documentation

◆ aliases

QMimeType::aliases

read

the list of aliases of this mimetype

For instance, for text/csv, the returned list would be: text/x-csv, text/x-comma-separated-values.

Note that all QMimeType instances refer to proper mimetypes, never to aliases directly.

The order of the aliases in the list is undefined.

While this property was introduced in 5.10, the corresponding accessor method has always been there.

Definition at line 98 of file qmimetype.h.

◆ allAncestors

QMimeType::allAncestors

read

the names of direct and indirect parent MIME types

Return all the parent mimetypes of this mimetype, direct and indirect. This includes the parent(s) of its parent(s), etc.

For instance, for image/svg+xml the list would be: application/xml, text/plain, application/octet-stream.

Note that application/octet-stream is the ultimate parent for all types of files (but not directories).

While this property was introduced in 5.10, the corresponding accessor method has always been there.

Definition at line 98 of file qmimetype.h.

◆ comment

QMimeType::comment

read

the description of the MIME type to be displayed on user interfaces

The default language (QLocale().name()) is used to select the appropriate translation.

While this property was introduced in 5.10, the corresponding accessor method has always been there.

Definition at line 98 of file qmimetype.h.

Referenced by filterString().

◆ filterString

QMimeType::filterString

read

a filter string usable for a file dialog

While this property was introduced in 5.10, the corresponding accessor method has always been there.

Definition at line 98 of file qmimetype.h.

◆ genericIconName

QMimeType::genericIconName

read

the file name of a generic icon that represents the MIME type

This should be used if the icon returned by iconName() cannot be found on the system. It is used for categories of similar types (like spreadsheets or archives) that can use a common icon. The freedesktop.org Icon Naming Specification lists a set of such icon names.

The icon name can be given to QIcon::fromTheme() in order to load the icon.

While this property was introduced in 5.10, the corresponding accessor method has always been there.

Definition at line 98 of file qmimetype.h.

◆ globPatterns

QMimeType::globPatterns

read

the list of glob matching patterns

While this property was introduced in 5.10, the corresponding accessor method has always been there.

Definition at line 98 of file qmimetype.h.

◆ iconName

QMimeType::iconName

read

the file name of an icon image that represents the MIME type

The icon name can be given to QIcon::fromTheme() in order to load the icon.

While this property was introduced in 5.10, the corresponding accessor method has always been there.

Definition at line 98 of file qmimetype.h.

◆ isDefault

QMimeType::isDefault

read

true if this MIME type is the default MIME type which applies to all files: application/octet-stream.

While this property was introduced in 5.10, the corresponding accessor method has always been there.

Definition at line 98 of file qmimetype.h.

Referenced by preferredSuffix().

◆ name

QMimeType::name

read

the name of the MIME type

While this property was introduced in 5.10, the corresponding accessor method has always been there.

Definition at line 98 of file qmimetype.h.

Referenced by QMimeXMLProvider::addMimeType(), fileType(), genericIconName(), iconName(), QMimeDatabasePrivate::mimeTypeForFileNameAndData(), QAndroidPlatformServices::openUrl(), and QWasmAudioOutput::setSource().

◆ parentMimeTypes

QMimeType::parentMimeTypes

read

the names of parent MIME types

A type is a subclass of another type if any instance of the first type is also an instance of the second. For example, all image/svg+xml files are also text/xml, text/plain and application/octet-stream files. Subclassing is about the format, rather than the category of the data (for example, there is no 'generic spreadsheet' class that all spreadsheets inherit from). Conversely, the parent mimetype of image/svg+xml is text/xml.

A mimetype can have multiple parents. For instance application/x-perl has two parents: application/x-executable and text/plain. This makes it possible to both execute perl scripts, and to open them in text editors.

While this property was introduced in 5.10, the corresponding accessor method has always been there.

Definition at line 98 of file qmimetype.h.

◆ preferredSuffix

QMimeType::preferredSuffix

read

the preferred suffix for the MIME type

No leading dot is included, so for instance this would return "pdf" for application/pdf. The return value can be empty, for mime types which do not have any suffixes associated.

While this property was introduced in 5.10, the corresponding accessor method has always been there.

Definition at line 98 of file qmimetype.h.

Referenced by QIcon::addFile(), AVFAudioDecoder::setSourceDevice(), and QQnxPlatformCamera::startVideoRecording().

◆ suffixes

QMimeType::suffixes

read

the known suffixes for the MIME type

No leading dot is included, so for instance this would return "jpg", "jpeg" for image/jpeg.

While this property was introduced in 5.10, the corresponding accessor method has always been there.

Definition at line 98 of file qmimetype.h.

Referenced by preferredSuffix().

◆ valid

QMimeType::valid

read

true if the QMimeType object contains valid data, false otherwise

A valid MIME type has a non-empty name(). The invalid MIME type is the default-constructed QMimeType.

While this property was introduced in 5.10, the corresponding accessor method has always been there.

Definition at line 98 of file qmimetype.h.

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

qtbase/src/corelib/mimetypes/qmimetype.h
qtbase/src/corelib/mimetypes/qmimetype.cpp

Public Member Functions

Protected Attributes

Properties

Friends

Related Symbols

Detailed Description

Constructor & Destructor Documentation

◆ QMimeType() [1/3]

◆ QMimeType() [2/3]

◆ QMimeType() [3/3]

◆ ~QMimeType()

Member Function Documentation

◆ aliases()

◆ allAncestors()

◆ comment()

◆ filterString()

◆ genericIconName()

◆ globPatterns()

◆ iconName()

◆ inherits()

◆ isDefault()

◆ isValid()

◆ name()

◆ operator!=()

◆ operator=()

◆ operator==()

◆ parentMimeTypes()

◆ preferredSuffix()

◆ suffixes()

◆ swap()

Friends And Related Symbol Documentation

◆ MimeTypeMapEntry

◆ qHash() [1/2]

◆ qHash [2/2]

◆ QMimeBinaryProvider

◆ QMimeDatabasePrivate

◆ QMimeTypeParserBase

◆ QMimeTypePrivate

◆ QMimeXMLProvider

Member Data Documentation

◆ d

Property Documentation

◆ aliases

◆ allAncestors

◆ comment

◆ filterString

◆ genericIconName

◆ globPatterns

◆ iconName

◆ isDefault

◆ name

◆ parentMimeTypes

◆ preferredSuffix

◆ suffixes

◆ valid