You can specify positional entries for display files. Read this topic for rules and examples for filling in positions 1 through 44 of the data description specifications (DDS) form.
- 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 the Usage for display files (position 38) topic. 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-, record-, help-, and field-level entries as well as syntax rules for specifying DDS keywords in the Rules for DDS keywords and parameter values topic. You can find complete examples in the Example: DDS for each file type topic.
The following figure shows a display file coding example.
Figure 1. Display file coding
|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8 00100A* DISPLAY FILE EXAMPLE 00101A* 00102A REF(PAYROLL) 00103A R MENU 00104A H HLPARA(1 1 12 80) 00105A HLPRCD(RECORD1 FILEA) 00106A N01 00107AO 02 FLDA 20I 2O 2 2DSPATR(HI) 00108A FLDB 22N 2B 3 2 00109A 72 73 00110AO 60 61 62 00111AA 63 DSPATR(HI) 00112A FLDC 7Y 0B 7 20DSPATR(RI PC) 00113A 42 43 00114AO 60 61 00115AO 62 9 2'Constant' 00116A FLDD R 11 2