Measurement-computing ADLIB WIN Manual de usuario descargar pdf (Pagina 127)

Chapter 40 Buffer Handler Functions

27-7

27.7 AL_SetBufferDoneHandler

Prototype C\C++

ERRNUM AL_SetBufferDoneHandler(LHLD lhld, LPSTR lpstrMethod)

Visual Basic for Windows

Function AL_SetBufferDoneHandler(ByVal lhld As Long,

ByVal lpstrMethod As String) As Long

LHLD lhld handle of the LDSD

LPSTR lpstrMethod address of the notification method string

The AL_SetBufferDoneHandler function sets the buffer done handler method of the LDSD. See sections

4.2 OPERATING MODES and 6.4 BUFFER NOTIFICATIONS for additional details.

Parameter Description

lhld Identifies the instance of the logical device subsystem.

lpstrMethod Points to the desired notification method. The available settings are defined in

the ADLIB include file as follows:

• AL_CHECK_BUFFER Buffers are polled for completion

• AL_POSTMESSAGE ADLIB calls a user function when

a buffer is completed.

• AL_POSTMESSAGE_PARAMS ADLIB calls a user function with

the user specified lparam and

wparam set by the

AL_SetBufferDoneHandlerParams

function when a buffer is completed

• AL_CALLBACK ADLIB calls a user defined function

per the function call

AL_SetBufferDoneHandlerFunc.

(MSC Support Only)

• AL_CONTINUOUS _WAVE For DAC channels only. ADLIB

automatically clears the buffer done

flag and puts the buffer back in the

queue, repeating buffers 0-N.

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Measurement-computing ADLIB WIN Manual de usuario Pagina 127