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The Query Host Update function lets the programmed operator determine if the host has updated the host presentation space or OIA because:
| • | The previous call to the Query Host Update function (for all calls to the Query Host Update function except the first). |
Prerequisite Calls
Start Host Notification (23)
Call Parameters
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Standard Interface
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Enhanced Interface
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Function Number
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Must be 24
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Data String
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1-character short name of the host presentation space, or a blank or null indicating request for updates to host-connected presentation space
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Length
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1 is implied
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4 is implied
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PS Position
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NA
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The calling data string can contain:
Byte
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Definition
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Standard
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Enhanced
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1
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1
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A 1-character presentation space short name (PSID)
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2-4
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Reserved
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Return Parameters
Return Code
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Definition
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0
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No updates have been made since the last call.
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1
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An incorrect host presentation space was specified.
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8
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No prior Start Host Notification (23) function was called for the host presentation space ID.
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9
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A system error was encountered.
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21
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The OIA was updated.
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22
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The presentation space was updated.
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23
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Both the OIA and the host presentation space were updated.
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44
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Printing has completed in the printer session.
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Remarks
The target presentation space must be specified in the data string, even though a connection to the host presentation space is not necessary to check for updates.
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