Field Attributes

Every field in the presentation space has corresponding field attributes. This 16-bit value defines the type of information that can be entered in that field by an operator or by an application. Field attributes are returned using the findField or findFieldEx method for any of the viewer types.

Field attributes define information about each field in the presentation space, such as:

The beginning location of a field
Whether the field is protected (read-only) or unprotected (read and write)
The type of data allowed in the field (alphanumeric or numeric)
The appearance of the field (color, blinking, reverse video)
Whether the field is left or right justified
Whether the field has been modified since it was put on the presentation space

The following sections provide a list of field attributes for 3270, 5250, and VT presentation spaces.

3270 Field Attributes

The following table lists the field attribute bits and the information defined for each field in the 3270 presentation space.

Bit Position	Description	Value
15–8	Reserved	0 (zeros)
7–6	Field attribute byte	Both set to 1
5	Unprotected/protected	0=Unprotected data field 1=Protected data field
4	Field type	0=Alphanumeric 1=Numeric only
3–2	I/SPD	00=Normal intensity; not pen-detectable 01=Normal intensity; pen-detectable 10=High intensity; pen-detectable 11=Non display; not pen-detectable
1	Reserved	0 (zero)
0	Modified data tag	0=Field has not been modified 1=Field has been modified

5250 Field Attributes

The following table lists the field attribute bits and the information defined for each field in the 5250 presentation space.

Bit Position	Description	Value
15–8	Reserved	0 (zeros)
7	Field attribute byte	Set to 1
6	Visibility	0=Secure video 1=Normal video
5	Unprotected/protected	0=Unprotected data field 1=Protected data field
4	Reserved	0 (zero)
3–1	Field type	1=Alphabetic only 2=Uppercase 3=Numeric only
0	Modified data tag	0=Field has not been modified 1=Field has been modified

VT Field Attributes

The following table lists the field attribute bits and the information defined for each field in the VT presentation space.

Bit Position	Description	Value
15–9	Reserved	0 (zeros)
8	Unprotected/protected	0=Unprotected 1=Protected
7	DoubleWidth DoubleHeight Top	0=Off 1=On
6	DoubleWidth DoubleHeight Bottom	0=Off 1=On
5	DoubleWidth SingleHeight	0=Off 1=On
4	Visibility	0=Secure video 1=Normal video
3	Inverse	0=Normal video 1=Reverse video
2	Blink	0=No blink 1=Blink
1	Underline	0=No underline 1=Underline
0	Bold	0=No bold 1=Bold


	The Presentation Space, Overview
	Fields and Attributes, Overview
	Extended Attributes
	OIA Data
	Key Codes
	IScreenAPI Interface