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Query Communication Event (81)
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The Query Communication Event function lets the EHLLAPI program determine whether any communication events have occurred.
Prerequisite Calls
Start Communication Notification (80)
Call Parameters
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Enhanced Interface
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Function Number
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Must be 81
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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 the host-connected presentation space
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Length
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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 structure contains these elements:
Byte
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Definition
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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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The function was successful
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1
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An incorrect PSID was specified
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8
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No prior call to Start Communication Notification (80) function was called for the PSID
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9
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A system error was encountered
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21
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The indicated PSID was connected
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22
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The Indicated PSID was disconnected
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