The QMimeType class describes types of file or data, represented by a MIME type string. 更多...
| 头： | #include <QMimeType> |
| qmake: | QT += core |
| Since: | Qt 5.0 |
| QMimeType () | |
| QMimeType (const QMimeType & other ) | |
| ~QMimeType () | |
| QStringList | aliases () const |
| QStringList | allAncestors () const |
| QString | comment () const |
| QString | filterString () const |
| QString | genericIconName () const |
| QStringList | globPatterns () const |
| QString | iconName () const |
| bool | inherits (const QString & mimeTypeName ) const |
| bool | isDefault () const |
| bool | isValid () const |
| QString | name () const |
| QStringList | parentMimeTypes () const |
| QString | preferredSuffix () const |
| QStringList | suffixes () const |
| void | swap (QMimeType & other ) |
| bool | operator!= (const QMimeType & other ) const |
| QMimeType & | operator= (const QMimeType & other ) |
| QMimeType & | operator= (QMimeType && other ) |
| bool | operator== (const QMimeType & other ) const |
| uint | qHash (const QMimeType & key , uint seed = 0) |
The QMimeType class describes types of file or data, represented by a MIME type string.
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 icon for the file, or even the descriptive 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.
另请参阅 QMimeDatabase and MIME 类型浏览器范例 .
Constructs this QMimeType object initialized with default property values that indicate an invalid MIME type.
Constructs this QMimeType object as a copy of other .
销毁 QMimeType object, and releases the d pointer.
Return 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.
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).
Returns the description of the MIME type to be displayed on user interfaces.
The default language (QLocale(). name ()) is used to select the appropriate translation.
Returns a filter string usable for a file dialog.
Returns 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.
Returns the list of glob matching patterns.
Returns 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.
返回
true
if this mimetype is
mimeTypeName
, or inherits
mimeTypeName
(见
parentMimeTypes
()), or
mimeTypeName
is an alias for this mimetype.
返回
true
if this MIME type is the default MIME type which applies to all files: application/octet-stream.
返回
true
若
QMimeType
object contains valid data, otherwise returns
false
. A valid MIME type has a non-empty
name
(). The invalid MIME type is the default-constructed
QMimeType
.
Returns the name of the MIME type.
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.
Returns 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.
Returns the known suffixes for the MIME type. No leading dot is included, so for instance this would return "jpg", "jpeg" for image/jpeg.
交换 QMimeType other with this QMimeType 对象。
此操作非常快且从不失败。
The swap() method helps with the implementation of assignment operators in an exception-safe way. For more information consult More C++ Idioms - Copy-and-swap .
返回
true
if
other
does not equal this
QMimeType
object, otherwise returns
false
.
Assigns the data of other 到此 QMimeType object, and returns a reference to this object.
移动赋值 other 到此 QMimeType 实例。
该函数在 Qt 5.2 引入。
返回
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.
返回哈希值为 key ，使用 seed 做计算种子。
该函数在 Qt 5.6 引入。
