CntNotifyCounterError


Function

Sets the notify of counter error (Abnormal input error, Filter error, Alarm error). Supports multi-processing.

Format

Ret =CntNotifyCounterError ( Id , hWnd )

Parameters

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

hWnd [ VB.NET: IntPtr ] [ C, C++: HWND ] [ C#: IntPtr ] [ Python: ctypes.wintypes.HANDLE ]
Specify the window handle that receives the notify of counter error.
The window handle can be retrieved by m_hWnd for VC.
Specify 0 when using callback without using window message.

Return Value

Ret [ VB.NET: Integer ] [ C, C++: long ] [ C#: int ] [ Python: ctypes.c_long ]

Definition

Value

Description

CNT_ERR_SUCCESS

0

Normality completion

CNT_ERR_SYS_RECOVERED_FROM_STANDBY

7

Execute the function CntResetDevice to return from the standby mode.

CNT_ERR_DLL_INVALID_ID

10001

Invalid ID was specified.

CNT_ERR_DLL_CALL_DRIVER

10002

CNT driver can't be called (Failed in the device I/O control).

CNT_ERR_DLL_CREATE_THREAD

10005

Failed in the creation of the thread (Failed in CreateThread).

CNT_ERR_DLL_HWND

10200

Window handle is invalid.

CNT_ERR_SYS_NOT_SUPPORTED

20001

This function can't be used by this device.

The others: (See also: Details of Error Code)

Remarks

Execute this function before the counter starts.

Interrupt is invalid if CntResetDevice is called.

The number of processes that can receive events varies depending on the device used.
For details, please refer to the list of the number of available processes.

The following message is posted to the specified window handle when interrupt occurs.

Definition

Value

CNTM_COUNTER_ERROR

1141H

The following information are contained in wParam and lParam that is the parameter of the message respectively.
* HIWORD and LOWORD show the high-word and low-word.

Definition

Description

LOWORD(wParam)

Device ID Retrieved from CntInit

HIWORD(wParam)

Channel Number

LOWORD(lParam)

Error kind

[Definition of error kind]

Definition

Value

Description

CNT_AI_ERROR

1

Abnormal input error

CNT_FLT_ERROR

2

Filter error

CNT_ALM_ERROR

3

Alarm error

Please refer to the sample program of each language for the describing details of message processing.

For Ethernet devices
  If communication with the device is lost, the process will be unregistered and events will no longer be notified.
  If you want to perform event notification again, please make the settings again using this function.

  You can check the registration status of the current process using the CntGetNetCommunicationInfo function.

Example

Sets the notify of counter error.

VB.NET

Dim Ret As Integer
Ret = CntNotifyCounterError ( Id , Handle )
 

C, C++

long Ret;
Ret = CntNotifyCounterError ( Id , m_hWnd );
 

C#

int Ret;
Ret = cnt.NotifyCounterError ( Id , Handle );
 

Python

Ret = ctypes.c_long()
handle = ctypes.windll.user32.FindWindowW(0, "Interrupt")
Ret.value = ccnt.CntNotifyCounterError ( Id , handle )
 

See Also

CntStopNotifyCounterError CntCounterErrorCallbackProc CntGetNetCommunicationInfo