AioGetCntEvent

Function

Retrieves the event factor of Window message notification relative to counter.

Format

Ret = AioGetCntEvent ( Id , CntChannel , hWnd , CntEvent )

Parameters

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

CntChannel [ VB.NET : Short ] [ C, C++ : short ] [ C# : short ] [ Python : ctypes.c_short ]
Sets the channel of counter.

hWnd [ VB.NET : IntPtr ] [ C, C++ : HWND * ] [ C# : out IntPtr ] [ Python : ctypes.POINTER(ctypes.wintypes.HANDLE) ]
Specifies the address of the variable that stores Window handle.
If the handle needn't be retrieved, please set NULL to it.

CntEvent [ VB.NET : Integer ] [ C, C++ : long * ] [ C# : out int ] [ Python : ctypes.POINTER(ctypes.c_long) ]
Specifies the address of the variable that stores the event factor.
CntEvent has the following meanings in bit.

Event factor	Macro	Value
Event comparison count match	CNTE_DATA_NUM	00000010H
Event count overrun	CNTE_ORERR	00010000H
Event that counter operation error	CNTE_ERR	00020000H

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.
15090	The value of CntChannel is outside the designated range of the function
15091	Pointer to CntEvent 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, counter 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.
25090	The value of CntChannel is outside the designated range of the device being used

Initial value

CntEvent = 0 for all devices

Remarks

This function cannot be used devices without counter functionality.
If the device is in operation, the function cannot be performed.

Example

Retrieves the event factor of the message notification for channel 0.

VB.NET	Dim Ret As Integer Dim hWnd As IntPtr Dim CntEvent As Integer Ret = AioGetCntEvent ( Id , 0 , hWnd , CntEvent )
C, C++	long Ret; HWND hWnd; long CntEvent; Ret = AioGetCntEvent ( Id , 0 , &hWnd , &CntEvent );
C#	int Ret; IntPtr hWnd; int CntEvent; Ret = aio.GetCntEvent ( Id , 0 , out hWnd , out CntEvent );
Python	Ret = ctypes.c_long() handle = ctypes.windll.user32.FindWindowW(0, "Interrupt") CntEvent = ctypes.c_long() Ret.value = caio.AioGetCntEvent ( Id , 0 , ctypes.byref(handle) , ctypes.byref(CntEvent) )