Measurement-computing ADLIB WIN Bedienungsanleitung PDF herunterladen (Seite 27)

Chapter 6 Memory Buffer Allocation

6-3

DWORD dwBufferType; /* Data Buffer type. */

DWORD dwBufferSize; /* Size of each buffer in bytes. */

DWORD dwBufferWrite; /* Number of data samples in the buffer. */

DWORD dwBufferRead; /* Number of data samples obtained from the buffer. */

DWORD dwTrigPoint; /* App linear address of the trigger point. */

DWORD dwTrigPointStart; /* App linear starting address of the */

/* pre-trigger data. */

DWORD dwDoneFlag; /* Buffer complete flag */

DWORD dwStatusFlags; /* Current status */

long lErrorFlags; /* Buffer errors */

DWORD dwBuffNum; /* Buffer number ID */

}DATABUFFSTAT;

typedef DATABUFFSTAT FAR * LPDATABUFFSTATUS;

Visual Basic for Windows adlib.bas file

Type DATABUFFSTATUS

lBufferType As Long ' Data Buffer type.

lBufferSize As Long ' Size of each buffer in bytes.

lBufferWrite As Long ' Number of data samples in the buffer.

lBufferRead As Long ' Number of data samples obtained from the buffer.

lTrigPoint As Long ' App buffer position number of the trigger point.

lTrigPointStart As Long ' App buffer position number of the pre-trigger data.

lDoneFlag As Long ' Buffer complete flag

lStatusFlags As Long ' Current status

lErrorFlags As Long ' Buffer errors

lBuffNum As Long ' Buffer number ID

End Type

6.4 BUFFER NOTIFICATIONS

6.4.1 C\C++

The user application has three choices of obtaining a pointer to a buffer that has been completed

(BUFFER_DONE).

1. The first method involves calling the ADLIB function AL_GetDoneBuffPtr(LHLD), which will return

a pointer to the next completed buffer when available, otherwise this function returns NULL.

2. The second method uses Windows Post-message handler routine installed by the user application.

Each time a buffer is completed the user routine will be called, passing a pointer to the buffer in the

1Param parameter. See example program adlai01.

Example:

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Measurement-computing ADLIB WIN Bedienungsanleitung Seite 27