DEC Text Processing Utility Program Development

5.2 Programming in DECwindows DECTPU

DECTPU converts the value you specify into the data type appropriate for the widget resource you are setting. Table 5–1 shows the relationship between DECTPU data types for widget resources and DECwindows data types for widget resources.

Table 5–1 Relationship Between DECTPU Data Types and DECwindows Argument Data Types

DECwindows Argument Data Type

DECTPU Data Type

 

 

Array of strings

Array of strings

Boolean

Integer

Callback

Integer (0)

Compound string

String

Compound string table

Array of strings

Dimension

Integer

Integer

Integer

Position

Integer

Short

Integer

String

String

Unsigned character

Integer

 

 

DECTPU does not support setting values for resources (such as pixmap, color map, font, icon, widget, and so on) whose data types are not listed in this table.

When you pass an array that specifies values for a widget’s resources by using CREATE_WIDGET or SET (WIDGET), DECTPU verifies that each array index is a string that corresponds to a valid resource name for the specified widget.

DECTPU also verifies that the data type of the value you specify is valid for the specified resource.

5.2.6.2 Specifying a List as a Resource Value

List box and file selection widgets manipulate lists. For example, the file selection widget manipulates a list of files. The widget resource that stores such a list is specified to DECTPU by using an array.

To handle an array that passes a list to a widget, DECwindows must know how many elements the array contains. For example, if you set the value of the "items" resource of a list box widget to point to a given array, DECwindows does not handle the array successfully unless the list box widget’s "itemsCount" resource contains the number of elements in the array.

However, you do not necessarily know how many elements the array has at a given moment. To help you pass arrays, DECTPU has a convention for referring to widget resources. If you follow the convention, DECTPU will handle the resource that stores the number of array elements.

The following paragraphs discuss the naming convention in more detail.

DEC Text Processing Utility Program Development 5–11

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Compaq AA-PWCBD-TE manual Specifying a List as a Resource Value, DECwindows Argument Data Type Dectpu Data Type
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