Image property tag type constants

You can store and retrieve image metadata with the help of a PropertyItem object. The type data member of a PropertyItem object specifies the data type of the values stored in the value data member of that same PropertyItem object.

The following constants, defined in Gdiplusimaging.h, can be assigned to the type data member of a PropertyItem object.

Constant	Description
PropertyTagTypeASCII	Specifies that the value data member is a null-terminated ASCII string. If you set the type data member of a PropertyItem object to PropertyTagTypeASCII, you should set the length data member to the length of the string including the NULL terminator. For example, the string HELLO would have a length of 6.
PropertyTagTypeByte	Specifies that the value data member is an array of bytes.
PropertyTagTypeLong	Specifies that the value data member is an array of unsigned long (32-bit) integers.
PropertyTagTypeRational	Specifies that the value data member is an array of pairs of unsigned long integers. Each pair represents a fraction; the first integer is the numerator and the second integer is the denominator.
PropertyTagTypeShort	Specifies that the value data member is an array of unsigned short (16-bit) integers.
PropertyTagTypeSLONG	Specifies that the value data member is an array of signed long (32-bit) integers.
PropertyTagTypeSRational	Specifies that the value data member is an array of pairs of signed long integers. Each pair represents a fraction; the first integer is the numerator and the second integer is the denominator.
PropertyTagTypeUndefined	Specifies that the value data member is an array of bytes that can hold values of any data type.

Requirements

Requirement	Value
Header	Gdiplusimaging.h

See also

• Image Property Tag Constants
• Image File Format Specifications
• Reading and Writing Metadata