Description
Opens one or more persisted sheets within an MDI frame window for dockable windows. OpenSheetWithParmFromDockingState also stores a parameter in the system's Message object so that it is accessible to the opened sheet.
Applies to
Window objects
Syntax
OpenSheetWithParmFromDockingState ( sheetrefvar, parameter {, windowtype }, mdiframe, sheetname )
|
Argument |
Description |
|---|---|
|
sheetrefvar |
The name of any window variable that is not an MDI frame window. OpenSheetWithParmFromDockingState places a reference to the open sheet in sheetrefvar. |
|
parameter |
The parameter you want to store in the Message object when the sheet is opened. Parameter must have one of these datatypes:
|
|
windowtype (optional) |
A string whose value is the datatype of the window you want to open. The datatype of windowtype must be the same or a descendant of sheetrefvar. |
|
mdiframe |
The name of an MDI frame window. |
|
sheetname |
A unique string identifier for the sheet, which is used when layout is persisted. |
Return value
Integer.
Returns 1 if it succeeds and -1 if an error occurs. If any argument's value is null, OpenSheetWithParmFromDockingState returns null.
Usage
The system Message object has three properties for storing data. Depending on the datatype of the parameter specified for OpenSheetWithParmFromDockingState, scripts for the opened sheet would check one of the following properties.
|
Message object property |
Argument datatype |
|---|---|
|
Message.DoubleParm |
Double |
|
Message.PowerObjectParm |
PowerObject (PowerBuilder objects, including user-defined structures) |
|
Message.StringParm |
String |
In the opened window, it is a good idea to access the value passed in the Message object immediately (because some other script may use the Message object for another purpose).
Avoiding null object references
When you pass a PowerObject as a parameter, you are passing a reference to the object. The object must exist when you refer to it later or you get a null object reference, which causes an error. For example, if you pass the name of a control on a window that is being closed, that control will not exist when a script accesses the parameter.
