AioGetAoChannels

Function

Retrieves the number of channels for the analog output conversion.

Format

Ret = AioGetAoChannels ( Id , AoChannels )

Parameters

Id [ C, C++ : short ] [ Python : ctypes.c_short ]
Specifies the Device ID retrieved from AioInit function.

AoChannels [ C, C++ : short * ] [ Python : ctypes.POINTER(ctypes.c_short) ]
Specifies the address of the variable that stores the number of channels.

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.
13070	Pointer to AoChannels 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

One channel is used for all devices.

Remarks

This function cannot be used on devices without the analog output function.
This function can be executed even if the device is in operation.

Example

Retrieves the number of channels for the analog output conversion.

C, C++	long Ret; short AoChannels; Ret = AioGetAoChannels ( Id , &AoChannels );
Python	Ret = ctypes.c_long() AoChannels = ctypes.c_short() Ret.value = caio.AioGetAoChannels ( Id , ctypes.byref(AoChannels) )