Measurement-computing ADLIB WIN Uživatelský manuál stáhnout pdf (Strana 97)

Chapter 24 Channel Selections

23-3

23.2 AL_GetChannelList

Prototype C\C++

ERRNUM AL_GetChannelList(LHLD lhld, LPCHANLIST lpchanlist);

Visual Basic for Windows

Function AL_GetChannelList(ByVal lhld As Long,

lpchanlist As CHANLIST) As Long

LHLD lhld handle of the LDSD

LPCHANLIST lpchanlist address of the user channel list structure

The AL_GetChannelList function retrieves the current LDSD channel and gain settings. If a device

supports gain settings, the list is considered a channel and gain list, and will be set in a channel then gain

sequence. See examples below.

Parameter Description

lhld Identifies the instance of the logical device subsystem.

lpchanlist Specifies a 32 bit far pointer to a channel information structure. The structure

has been predefined in the ADLIB include file and is defined as follows:

typedef struct tagCHANLIST

{

long lType; /* 0 = Not Defined */

/* 1 = Use string list */

/* 2 = Use array of numbers */

char achChannelList[MAX_CHANLIST_STRLEN];

long lNumElements;

long alChannelList[MAX_CHANLIST_ARRAYLEN];

}CHANLIST;

typedef CHANLIST FAR * LPCHANLIST;

Returns:

On success ERRNUM is set to 1 and the lpchanlist structure is filled with the device's channel list settings,

otherwise ERRNUM contains the last error code that occurred during the call, and the lpchanlist structure

may contain invalid information.

Related Functions:

AL_SetChannelList

AL_SetMinStartChan

AL_GetMinStartChan

AL_SetMaxEndChan

AL_GetMaxEndChan

AL_SetGainGlobal

Examples:

• string “0,1,2,3,4,5,6,7”

• string with gains “0(1),1(2),2(4),3(8),4(1),5(2),6(4),7(8)”

• array {0,1,2,3,4,5,6,7};

• array with gains {0,1,1,2,2,4,3,8,4,1,5,2,6,4,7,8};

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