Question

Type Mismatch when passing property variant from out of process exe back to calling process

Asked by: docstar

I have an out of process EXE that hosts an OCX UI component on a form. When I create this process I need my calling process to be able to get a reference to that object. Both the Out of process exe and the calling process have a reference to the OCX.
I could not directly expose the OCX Type (called imageWin from here on out). So it is exposed as a type of variant. In my calling process I have a variable of type imageWin, I set this equal to the out of process property.
In development this works fine. The problem is when deployed to another machine a type mismatch (-13) is raised.
See the example below

Calling Process Code:
Private Sub Command1_Click()
    Dim dsimage As dsImageExe
    Dim obj As dsimage
    
    Set dsimage = New dsImageExe
    Set obj = dsimage.DSImageObj
    MsgBox obj.AutoRedraw
    
    Set obj = Nothing
    Set dsimage = Nothing
End Sub
 
Out Of Process dsImageExe class code:
Public Property Get DSImageObj() As Variant
    Set DSImageObj = frmMain.DSImage1
End Property
Private Sub Class_Initialize()
    Load frmMain
End Sub
Private Sub Class_Terminate()
    Unload frmMain
End Sub

                                  
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Asked On
2009-08-28 at 13:23:06ID24691038
Tags

com ocx

,

out of process exe

,

visual basic 98

,

vb6

Topic

Visual Basic Programming

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Answers

 

by: docstarPosted on 2009-08-28 at 13:35:59ID: 25211364

Some more Information:
If my calling process has a variable type of Variant and set that variable to the out of process property no error is raised in dev or production. The problem with this is that the calling process passes its reference on to several other shared classes and change all of them to type variant would be a bear.

Private Sub Command1_Click()
    Dim dsimage As dsImageExe
    Dim obj As Variant
    
    Set dsimage = New dsImageExe
    Set obj = dsimage.DSImageObj
    MsgBox obj.AutoRedraw
    
    Set obj = Nothing
    Set dsimage = Nothing
End Sub
                                              
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by: EDDYKTPosted on 2009-08-31 at 04:10:13ID: 25221859

can you do


Private Sub Command1_Click()
    Dim dsimage As dsImageExe
    Dim obj As Variant
    Dim obj1 As dsimage
   
    Set dsimage = New dsImageExe
    Set obj = dsimage.DSImageObj
    Set obj1 = Obj
    MsgBox obj1.AutoRedraw
   
    Set obj = Nothing
    Set obj1 = Nothing
    Set dsimage = Nothing
End Sub

 

by: docstarPosted on 2009-08-31 at 08:48:28ID: 25223749

No good, I sitll recieved the same error ( type mismatch (-13).
However I did end up finding a way to resolve the issue:

1)Remove the OCX component reference from the in process app (leave it in out of process)
2)Add the OCX as a Reference (not a component) in the in process app. Save the project and close VB6. Reopen and you will notice that the reference has disappeard, however if you look at the project file in notepad it is still there.
3)You are not able to set the local variable = out of process property. (In my case I set this property to return a type of Object)

There is one catch to doing it this way. Any properties that are inharited from being an OCX (IE Height, Width,...) are not accessable, but all of your custom properties/methods are.

20120131-EE-VQP-002

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