AioSetCntEvent

Function

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

Format

Ret = AioSetCntEvent ( 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 ]
Specifies the channel of counter.

hWnd [ VB.NET : IntPtr ] [ C, C++ : HWND ] [ C# : IntPtr ] [ Python : ctypes.wintypes.HANDLE ]
Specifies Window handle.

CntEvent [ VB.NET : Integer ] [ C, C++ : long ] [ C# : int ] [ Python : ctypes.c_long ]
Event factor is specified from the following range in the macro or numerical value.
CntEvent has the following meanings in bit, it can be specified by a combination of these bits.

Event factor	Macro	Value
Comparison count match event	CNTE_DATA_NUM	00000010H
Count overrun event	CNTE_ORERR	00010000H
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.
15080	The value of CntChannel is outside the designated range of the function
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.
25080	The value of CntChannel is outside the designated range of the device being used

Initial value

CntEvent = 0 (Not use event) for all devices

Remarks

The event factor set in this function are notified as message to event message routine.
The message type are as follows.

Message factor of counter	Macro	Value
Comparison count match event	AIOM_CNTE_DATA_NUM	1042H
Count overrun event	AIOM_CNTE_ORERR	1043H
Count operation error event	AIOM_CNTE_ERR	1044H

This function cannot be used on devices without counter functionality.
If the device is in operation, the function cannot be performed.
It cannot be used with callback routine (AioSetCntCallBackProc).

Example

Sets the comparison count match event for channel 0.

VB.NET	WndProc Dim Ret As Integer Ret = AioSetCntEvent ( Id , 0 , Handle , AIOM_CNTE_DATA_NUM)
C, C++	long Ret; Ret = AioSetCntEvent ( Id , 0 , m_hWnd , AIOM_CNTE_DATA_NUM );
C#	WndProc int Ret; Ret = AioSetCntEvent ( Id , 0 , Handle , (int)CaioConst.AIOM_CNTE_DATA_NUM );
Python	Ret = ctypes.c_long() handle = ctypes.windll.user32.FindWindowW(0, "Interrupt") Ret.value = caio.AioSetCntEvent ( Id , 0 , handle , caio.AIOM_CNTE_DATA_NUM )

Event message routine

In Visual Basic .NET(WndProc)

Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
m.Msg:Message ID is passed.
m.WParam:ID is passed in lower 2 bytes. The channel number of counter in that the event occurred is passed in higher 2 bytes.
m.LParam:The parameter peculiar to event is passed.

In Visual C#(WndProc)

[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]
protected override void WndProc (ref Message m)
m.Msg:Message ID is passed.
m.WParam:ID is passed in lower 2 bytes. The channel number of counter in that the event occurred is passed in higher 2 bytes.
m.LParam:The parameter peculiar to event is passed.

Event message routine in Visual C++

LRESULT CVC6Dlg::DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam)
message: Message ID is passed.
wParam: ID is passed in lower 2 bytes. The channel number of counter in that the event occurred is passed in higher 2 bytes.
lParam: The parameter peculiar to event is passed.

3 arguments are passed to the Event Message Routine: Message ID, ID, and Parameter peculiar to event.
Message ID and Parameter peculiar to event are as shown in the following table.

Message ID

Counter message factor	Macro	Value
Comparison count match event	AIOM_CNTE_DATA_NUM	1042H
Count overrun event	AIOM_CNTE_ORERR	1043H
Count operation error event	AIOM_CNTE_ERR	1044H

Parameter peculiar to event

The current counter value is passed.
When the comparison count match event occurs, the value specified by AioSetCntComparisonReg is passed.