CntReadCount

Function

Read the count value for the specified channels.

Format

Ret = CntReadCount ( Id , ChNo , ChNum , CntDat )

Parameters

Id [C: short] [Python: ctypes.c_short]
Specifies the device ID retrieved from CntInit.

ChNo [C: short *] [Python: ctypes.POINTER(ctypes.c_short)]
Specifies the base address of array which stores the channel number to get count.

ChNum [C: short] [Python: ctypes.c_short]
Specifies the number of channels which is specified in ChNo array.

CntDat [C: unsigned long *] [Python: ctypes.POINTER(ctypes.c_ulong)]
Specifies the base address of array which stores the count value.

Return Value

Ret [C: long] [Python: ctypes.c_long]

Definition	Value	Description
CNT_ERR_SUCCESS	0	Normal Complete
CNT_ERR_DLL_INVALID_ID	10001	Invalid ID is specified.
CNT_ERR_DLL_CALL_DRIVER	10002	Driver cannot be called (failed in ioctl).
CNT_ERR_DLL_BUFF_ADDRESS	10101	Invalid data buffer address.
CNT_ERR_SYS_CH_NO	20201	Channel number is outside the range.
CNT_ERR_SYS_CH_NUM	20202	Number of channels is outside the range.

The other errors: (See also: Details of Error Code)

Initial Value

None

Remarks

Read the counter value for the specified channels.
Channel number is stored in an array.
The corresponding count values are stored into it's array in the order that the channel numbers were stored into it's array

Example

C	Ret = CntReadCount ( Id , &ChNo[0] , ChNum , &CntDat[0] );
Python	Ret = ccnt.CntReadCount ( Id , ChNo , ChNum , CntDat )