dpExists()
The function dpExists() checks the existence of a valid data point identifier.
Synopsis
bool dpExists(string dpname);
Parameter
| Parameter | Description |
|---|---|
| dpname | A data point identifier:
A sys, a DPT, a DP, a DPE, a config, a detail or an attr. |
Return Value
The function returns true if at least one part of a data point identifier can be resolved correctly and otherwise FALSE.
Errors
The errors can be retrieved with getLastError(). This includes missing or incorrect arguments.
Description
The function dpExists() checks the existence of a valid data point identifier. The function returns true if at least one part can be resolved correctly, i.e. a sys, a DPT, a DP, a DPE, a config, a detail or an attr.
The following calls return TRUE:
dpExists(":_original.._value");
dpExists("System1:");
dpExists(":"); Anmerkung: If you want to check for a dedicated part of the data point identifier such as DP name or DP+DPE, you must additionally call the function dpSubStr() with the appropriate enum parameter:
bool e = dpExists(dpSubStr(ident2check, DPSUB_DP)); The example checks if the data point ExampleDP_Arg1. exists.
main()
{
bool retVal;
retVal = dpExists("System1:ExampleDP_Arg1");
DebugN("dpExists:", retVal);
}
Assignment
Data point function
Availability
UI, CTRL
