GGTITM

GDDM-GKS V1R1 Programming Guide and Reference

GGTITM

GDDM-GKS V1R1 Programming Guide and Reference
SC33-0334-00

Purpose


GGTITM	(wkid, type, idrl)

APL code	1410
GKS RCP code	X'38006600' (939550208)

Function: To get item type from GKSM.

Metafile function. Returns the next item type and data record length.

Parameters

wkid (specified by user) (fullword integer)
The identifier selected when the workstation was opened.

type (returned by GDDM) (fullword integer)
The item type. This number identifies the stored item.

idrl (returned by GDDM) (fullword integer)
The item data record length.

Operating states

WSOP, WSAC, SGOP

Related functions

Write item to GKSM (GWITM), Read item from GKSM (GRDITM), Interpret item (GIITM)

Description

A GKS metafile (GKSM) is a sequential file that behaves like a workstation. To retrieve information from a metafile, you must open a metafile input (MI) workstation. This function returns the type and the data record length of the current metafile item. You can now use the function Read item from GKSM (GRDITM) to obtain the item data record and to make the next item in the metafile the current item.

Refer to Appendix C, "Metafile structure" in topic C.0 for a list of the metafile item types.

Principal errors

7: GKS not in proper state: GKS shall be in one of the states WSOP, WSAC, or SGOP
20: Specified workstation identifier is invalid
25: Specified workstation is not open
34: Specified workstation is not of category MI
162: No item is left in GKS Metafile input
163: Metafile item is invalid

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