long IsValidItem (long PenHandle);
Available (from release):
stOCX (V4-0), stPro Automation (V4-0), stTabular History OCX (V4-01), stTabular History Automation (V4-01)
Return Value:
|
Value: |
Description: |
|
1 |
The pen is mapped to a valid OPC item. |
|
0 |
The pen is mapped to an invalid OPC item. |
|
-1 |
The state of the new item is unknown.
Tip: User code should keep checking IsValidItem (with a pause in-between) until it is a definitive 0 or 1 since -1 is "I don't know yet". |
Parameters:
|
Name: |
Description: |
|
PenHandle |
The handle of the pen that is to be verified. |
Remarks:
Call this function to see if the pen identified by the handle is valid.