CAST QVARIANT TO QSTRING

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If the type is String , an invalid time will be returned if the string cannot be parsed as a Qt. In other words, there is no toColor function. Returns the stored value converted to the template type T. This is very powerful and versatile, but may prove less memory and speed efficient than storing specific types in standard data structures. Returns the variant as a double if the variant has type Double , QMetaType. However that is specific for int types. ULongLong but is too large to be represented in an unsigned int, the resulting arithmetic overflow will not be reflected in ok. However, if the string contains non-numeric characters, it cannot be converted to an integer, and any attempt to convert it will fail.

The methods named toT e. You can use QVariant:: Behaves exactly like setValue otherwise. All other trademarks are property of their respective owners. Int , or QMetaType:: QSize ; otherwise returns an invalid QSize. Color 67 a QColor QVariant.

QVariant float val Constructs a new variant with a floating point value, val.

Cast a QVariant to a QList | Qt Forum

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Int 2 an int QVariant. UserType Base value for user-defined types. This enum type defines the types of variable that a QVariant can contain.

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Image 70 a QImage QVariant. QByteArray and its lower-case content is not one of the following: Transform 81 a QTransform QVariant. If ok is non-null: QVariant can be extended to support other types than those mentioned in the Type enum. Here is some example code to demonstrate the use of QVariant: UInt ; otherwise returns an invalid QChar.

Pay particular attention when working with char and QChar variants. This is typically because canConvert only reports the general ability of QVariant to convert between types given suitable data; it is still possible to supply data which cannot actually be converted.

This function was introduced in Qt 5.

qvariant(3) – Linux man page

Any Python object may be used whenever a QVariant is expected. If the ot is convertible to a ULongLong but is too large to be represented in an unsigned int, the resulting arithmetic overflow will not be reflected in ok.

QVariantList of a type that can be converted to QString ; otherwise returns an empty list. Without QVariantthis would be a problem for QObject:: Returns the storage type of the value stored in the variant.

QVariant will try to convert v if its type is not the same as this variant’s type. Locale 18 a QLocale QVariant. However that is specific for int types.

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QString if the list contains exactly one item QMetaType:: The problem is that it cast without error from the compiler in the below example, but the listA is completely empty.

Compares this QVariant with v and returns true if they are not equal; otherwise returns false.

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Constructs variant of type typeOrUserTypeand initializes with copy if copy is not 0. Compares this QVariant with v and returns true if this is less than v.

DateStringTime. Note that return values in the ranges QVariant:: Post as a guest Name. Date 14 a QDate QVariant. In other words, there is no toColor function.

The QVariant class acts like a union for the most common Qt data types. QStringan invalid date will be returned if the string cannot be parsed as a Qt:: If you ask for xast type that can be generated from the stored type, toT copies and converts and leaves the object itself unchanged.