[Oorexx-bugs] [ oorexx-Bugs-1149952 ] OLEObject - OUT-part of INOUT not supported

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Bugs item #1149952, was opened at 2005-02-23 10:03
Message generated for change (Comment added) made by miesfeld
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Rony G. Flatscher (orexx)
Assigned to: Nobody/Anonymous (nobody)
Summary: OLEObject - OUT-part of INOUT not supported

Initial Comment:
If invoked Windows functions contain INOUT arguments,
then changing of the arguments (due to OUT) on the
Windows side cannot be retrieved on the ooRexx side. 

Using the OLEObject method getOutParameters() will
return .nil in the case of INOUT arguments.

Here is a small example demonstrating this behaviour
automating MS Internet Explorer:

-------------------- cut here -------------------
msie=.oleobject~new("InternetExplorer.Application")

msie~visible=.true    -- show window
msie~navigate("http://www.ibm.com")

l=msie~left
t=msie~top
w=msie~width
h=msie~height
say "left:" l "top:" t ", width:" msie~width ",
height:" msie~height

x=0
y=0
msie~clientToWindow(x, y)
say "x=[" || x || "], y=["y"]" -- values not changed!

arr=msie~getOutparameters  -- try to get OUT arguments
if arr<>.nil then
do i=1 to arr~items
   say "arr["i"]="arr[i]
end

call sysSleep 10  -- show window another 10 seconds
msie~quit
-------------------- cut here -------------------



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Comment By: Mark Miesfeld (miesfeld)
Date: 2006-09-17 14:13

Message:
Logged In: YES 
user_id=191588

Patch # 1551673 has fixed this bug.  

Both Rony Flatscher and myself have tested the fix for 
several weeks and agree the fix corrects the problem Rony 
reported.

I believe this bug should be changed from open to pending.

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Comment By: Mark Miesfeld (miesfeld)
Date: 2006-09-03 18:32

Message:
Logged In: YES 
user_id=191588

This reason the getOutParameters method returns nil, in 
this case is as follows:

When an OLE Automation proxy object is created by ooRexx, 
the type info for the OLE Automation object is used to 
construct a table containing all the known methods and 
their parameters for that object.  This table is used by 
the proxy ooRexx object when inovking a method on the OLE 
Automation object.

If the table does not contain information for a method, 
usually the method can still be invoked by using an OLE 
Automation interface method called GetIDsOfNames.  
However, ooRexx then has no idea of the type of the 
parameters, and no outParameter array will be returned.

The problem here is that the method used to get the type 
information to build the table is slightly different than 
the method used in the getKnownMethods method.

I have submitted a patch that uses the same method to 
obtain all information on an OLE Object type as the 
getKnownMethods method uses.

I believe this is the correct method, it follows the 
outline MicroSoft provides in the MSDN Library.  Which is: 
find the containing type library of the object and the 
index in the library of the type information for that 
object.  Then use this to get the correct TypeInfo 
structure for the object.

This patch fixes this bug.

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