Defining a display file for DDS
When you specify positional entries for display files, you need to follow some specific rules for filling in positions 1 through 44 of the data description specifications (DDS) form.
- Specify the entries in the following order to define a
- File-level entries
- Record-level entries
- Help-level entries
- Field-level entries
- Specify at least one record format in the file. The maximum number of record formats in a display file is 1024. The maximum number of fields in any one record format is 32 763. The maximum number of fields that can be displayed per record is 4095. The maximum combined length of all named fields and indicators in a record format is 32 763 bytes, regardless of the usage (I, O, B, M, H, P). For more information, see Usage for display files (position 38). Also, see the Application Display Programming book for the maximum number of input-capable fields.Note: Specify the file name through the Create Display File (CRTDSPF) command, not through DDS.
You can find an explanation of file-level, record-level, help-level, and field-level entries as well as syntax rules for specifying DDS keywords in Rules for DDS keywords and parameter values.
The following figure shows a display file example.