AioGetAiChannels


Function

Retrieves the number of channels for the analog input conversion.

Format

Ret = AioGetAiChannels ( Id , AiChannels )

Parameters

Id [ VB.NET : Short ] [ C, C++ : short ] [ C# : short ] [ Python : ctypes.c_short ]
Specifies the ID retrieved from AioInit function.

AiChannels [ VB.NET : Short ] [ C, C++ : short * ] [ C# : out short ] [ Python : ctypes.POINTER(ctypes.c_short) ]
Specifies the address of the variable that stores the number of channels.

Return value

Ret [ VB.NET : Integer ] [ C, C++ : long ] [ C# : int ] [ Python : ctypes.c_long ]

Return values

Content

0

Normality completion

7

Execute AioResetDevice function because the device has recovered from standby mode

10001

Invalid Id was specified
Use the Id retrieved from AioInit to specify the Id in this function.

10002

AIO driver can't be called
At first, perform AioInit function.

11030

Pointer to AiChannels is NULL
Specify the address of variable to parameter.

20001

This function can't be used by this device

20003

Can not use because another process is using the device
When another process is using the device, all functions except for those that support multi-process can not be performed.

Initial value

1 channel is used for all devices.

Remarks

This function cannot be used on devices without the analog input function.
This function can be executed if the device is working.

Example

Retrieves the number of channels for the analog input conversion.

VB.NET

Dim Ret As Integer
Dim AiChannels As Short
Ret = AioGetAiChannels ( Id , AiChannels )
 

C, C++

long Ret;
short AiChannels;
Ret = AioGetAiChannels ( Id , &AiChannels );
 

C#

int Ret;
short AiChannels;
Ret = aio.GetAiChannels ( Id , out AiChannels );
 

Python

Ret = ctypes.c_long()
AiChannels = ctypes.c_short()
Ret.value = caio.AioGetAiChannels ( Id , ctypes.byref(AiChannels) )
 

See also

AioSetAiChannels AioGetAiMaxChannels