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# Obsolete Members for QImage

The following class members are obsolete. They are provided to keep old source code working. We strongly advise against using them in new code.

- QImage class reference

### Public Functions

- int serialNumber () const `(obsolete)`
- void setAlphaChannel ( const QImage & alphaChannel ) `(obsolete)`
- void setText ( const char * key, const char * language, const QString & text ) `(obsolete)`
- QString text ( const char * key, const char * language = 0 ) const `(obsolete)`
- QString text ( const QImageTextKeyLang & keywordAndLanguage ) const `(obsolete)`
- QStringList textLanguages () const `(obsolete)`
- QList<QImageTextKeyLang> textList () const `(obsolete)`

## Member Function Documentation

### int QImage::serialNumber () const

Returns a number that identifies the contents of this QImage object. Distinct QImage objects can only have the same serial number if they refer to the same contents (but they don't have to).

Use cacheKey() instead.

Warning: The serial number doesn't necessarily change when the image is altered. This means that it may be dangerous to use it as a cache key.

See also operator==().

### void QImage::setAlphaChannel ( const QImage & alphaChannel )

Sets the alpha channel of this image to the given alphaChannel.

If alphaChannel is an 8 bit grayscale image, the intensity values are written into this buffer directly. Otherwise, alphaChannel is converted to 32 bit and the intensity of the RGB pixel values is used.

Note that the image will be converted to the Format_ARGB32_Premultiplied format if the function succeeds.

Use one of the composition mods in QPainter::CompositionMode instead.

Warning: This function is expensive.

See also alphaChannel(), Image Transformations, and Image Formats.

### void QImage::setText ( const char * key, const char * language, const QString & text )

Sets the image text to the given text and associate it with the given key. The text is recorded in the specified language, or in a default language if language is 0.

Use setText() instead.

The language the text is recorded in is no longer relevant since the text is always set using QString and UTF-8 representation.

### QString QImage::text ( const char * key, const char * language = 0 ) const

Returns the text recorded for the given key in the given language, or in a default language if language is 0.

Use text() instead.

The language the text is recorded in is no longer relevant since the text is always set using QString and UTF-8 representation.

### QString QImage::text ( const QImageTextKeyLang & keywordAndLanguage ) const

This is an overloaded function.

Returns the text recorded for the given keywordAndLanguage.

Use text() instead.

The language the text is recorded in is no longer relevant since the text is always set using QString and UTF-8 representation.

### QStringList QImage::textLanguages () const

Returns the language identifiers for which some texts are recorded. Note that if you want to iterate over the list, you should iterate over a copy.

The language the text is recorded in is no longer relevant since the text is always set using QString and UTF-8 representation.

### QList<QImageTextKeyLang> QImage::textList () const

Returns a list of QImageTextKeyLang objects that enumerate all the texts key/language pairs set for this image.

Use textKeys() instead.

The language the text is recorded in is no longer relevant since the text is always set using QString and UTF-8 representation.