AioGetAoSamplingDataSize

Function

When the user buffer mode is used to transfer data, retrieves data size that is necessary for one generating. 
This data size is decided by the number of channels used.
Therefore, you need set the number of channels by using AioSetAoChannels function.

Format

Ret = AioGetAoSamplingDataSize ( Id , DataSize )

Parameters

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

DataSize [ VB.NET : Short ] [ C, C++ : short * ] [ C# : out short ] [ Python : ctypes.POINTER(ctypes.c_short) ]
Specifies the address of the variable that stores the data size.
Data size is stored as the number of packets. 1 packet = 4 bytes.

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.

13640

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

20001

This function can't be used by this device

20002

Can not use while by another device works
To use this function, analog output operation must be stopped.

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

In all devices, DataSize = 1

Remarks

This function cannot be used on devices without the analog output function.
If the device is in operation, the function cannot be performed.

Example

Retrieves data size that is necessary for one generating.

VB.NET

Dim Ret As Integer
Dim DataSize As Short
Ret = AioGetAoSamplingDataSize ( Id , DataSize )
 

C, C++

long Ret;
short DataSize;
Ret = AioGetAoSamplingDataSize ( Id , &DataSize );
 

C#

int Ret;
short DataSize;
Ret = aio.GetAoSamplingDataSize ( Id , out DataSize );
 

Python

Ret = ctypes.c_long()
DataSize = ctypes.c_short()
Ret.value = caio.AioGetAoSamplingDataSize ( Id , ctypes.byref(DataSize) )