AioGetAiTransferSize

Function

Gets the transfer size for user buffer mode.

Format

Ret = AioGetAiTransferSize ( Id, AutoMode, TransferSize )

Parameters

Id　[ C, C++ : short ] [ Python : ctypes.c_short ]
Specify the ID obtained by the AioInit function.

AutoMode [ C, C++ : short *  ] [ Python : ctypes.POINTER(ctypes.c_short) ]
Stores the method of setting the transfer size.

Macro

Value

 

AI_TRANSFERSIZE_MANUAL

0

Set the transfer size manually

AI_TRANSFERSIZE_AUTO

1

Set the transfer size automatically

TransferSize [ C, C++ : long *  ] [ Python : cytpes.POINTER(ctypes.c_long) ]
Stores the transfer size.
Transfer size is set in number of packets.

Return value

Ret [ C, C++ : long ] [ 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.

12530

AutoMode is NULL. Please specify the address of the variable in the parameter

12531

TransferSize is NULL. Please specify the address of the variable in the 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.

22520

An internal driver error has occurred.

Initial value

The initial value for all devices is as follows
AutoMode = 1
TransferSize = Since the transfer size is set automatically, it varies depending on the device.

AI-1664UG-PE
AIO-163202G-PE
AIO-163202UG-PE
AIO-123202G-PE
AIO-123202UG-PE

1

Remarks

Get the transfer size for one transfer in user buffer mode.

Please refer to the AioSetAiTransferSize function for the specification of automatic setting.

Example

Get the transfer size and the method of setting transfer size.

C, C++

long Ret;

short AutoMode;
long TransferSize;
Ret = AioGetAiTransferSize ( Id , &AutoMode , &TransferSize );
 

Python

Ret = ctypes.c_long()
AutoMode = ctypes.c_long()
TransferSize = ctypes.c_long()
Ret.value = caio.AioGetAiTransferSize ( Id , ctypes.byref(AutoMode) , ctypes.byref(TransferSize) )