Callback object definition

When the EAServer component
has finished processing, the shared object notifies a user object
called uo_callback, which in turn
notifies the w_employee window. The uo_callback object
has two functions, Notify and PassObject.

Notify function

The Notify function calls a function called SetDW on
the w_employee window, passing it
the DataWindow Blob returned from the server
component. The Notify function takes the argument ablb_data,
which is of type Blob, and returns a Long value.
The function has the following script:

long ll_rv<br>ll_rv = iw_employee.setdw(ablb_data)<br>if ll_rv = -1 then<br>    MessageBox("Error", "SetDW call failed!")<br>end if<br>return ll_rv

1	long ll_rv<br>ll_rv = iw_employee.setdw(ablb_data)<br>if ll_rv = -1 then<br> MessageBox("Error", "SetDW call failed!")<br>end if<br>return ll_rv

PassObject function

The PassObject function caches a reference
to the w_employee window in the iw_employee instance
variable. The function takes the argument aw_employee, which
is of type w_employee, and returns
a Long value:

iw_employee = aw_employee<br>return 1

1	iw_employee = aw_employee<br>return 1

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Powerbuilder Documentation 12.5

August 9, 2023

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