Measurement Computing ADLIB WIN - Manual (Page 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};