dpDisconnectExtUserData()
Unregisters a callback function called with using dpDisconnectExtUserData().
Synopsis
int dpDisconnectExtUserData([class object,] string|function_ptr work, anytype
userData, dyn_string dpConn, dyn_string dpExt);
Parameters
| Parameter | Description |
|---|---|
| object | An object of a Control++ class. |
| userData | User-defined data that is passed as a parameter to the callback function. |
| dpConn | List of the data points whose value change disconnect the work function. |
| dpExt |
List of the extended data points. |
Return Value
The function dpDisconnectExtUserData() returns 0 and in the event of a failure it returns -1.
Errors
Errors can be retrieved with getLastError(). This includes missing arguments or if the data point or work function does not exist. The use of not initialized variables for the parameter userData will raise an error.
Description
The function dpDisconnectExtUserData() unregisters the function work() from being called if the values of the data point attributes dpConn are changed. The work function is no longer executed automatically.
A dpDisconnectExtUserData() can only be used in the same script as the dpConnectExtUserData()!
You can find an example of how to use a CONTROL++ class instance in a connect function in the chapter dpConnect().
Assignment
Availability
CTRL
