IAsyncMessage::ReadSTB

Description

Reads a status byte of the service request from a service requester (the message-based device). For example, on the IEEE 488.2 interface, the message is read by polling devices; for other types of interfaces, a message is sent in response to a service request to retrieve status information. If the status information is only one byte long, the most significant byte is returned with the zero value. If the service requester does not respond in the actual timeout period, VI_ERROR_TMO is returned.

VB Prototype

value As Short = ReadSTB(
)

C++ Prototype

HRESULT ReadSTB(
  short* pStatusByte
);

Parameters

pStatusByte

The Status Byte.

Return Value

Refer to the table of return codes. 

See Also

ComponentVersion, SpecVersion, HardwareInterfaceName, HardwareInterfaceNumber, HardwareInterfaceType, LockState, OptionString, ProgID, ResourceName, SessionType, SoftwareManufacturerID, SoftwareManufacturerName, Timeout, LastStatus, IOProtocol, SendEndEnabled, TerminationCharacter, TerminationCharacterEnabled, GetAttribute, SetAttribute, LockRsrc, UnlockRsrc, Init, Close, AssertTrigger, Clear, ReadSTB, Read, Write, WriteString, Terminate, IAsyncMessage Overview