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Is it possible to call a Java-function from VB6 and get the returned data from the function call?

Posted on 2006-10-19
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Last Modified: 2010-04-30
Is it possible to call a Java-function from VB6 and get the returned data from the function call?
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Question by:expertfan
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by:expertfan
ID: 17764175
if yes, please post a sample program.
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herreruud earned 2000 total points
ID: 17764223
Hi,

I did a seach to see if Java is COM-capable, and apparently it is.
What you need to do is expose your java functon in a COM-object and reference it in VB6.
I don't really know Java, but I found this link describing how to register a java class as a COM server: http://www.rgagnon.com/javadetails/java-0044.html

(I'll be using the Java-class from the link in this example)

When you have registered the COM-object according to the instructions you can add a reference to it in VB6:

1. Open VB6
2. Start a new standard windows exe project
3. Choose "Project"->"References" on the menu.
4. Add your Java Object.
5. Drop a CommandButton onto your form.
6. Double-click your form; you should be presented with this:

Private Sub Command1_Click()

End Sub

7. Change it to this:

Private Sub Command1_Click()
    Dim oJava As JavaCom.JavaSays
    Set oJava = New JavaCom.JavaSays
   
    MsgBox oJava.Hello
    MsgBox oJava.Say("String passed through Java object")

End Sub

 
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Expert Comment

by:herreruud
ID: 18048065
I believe I provided the correct answer, but the author never responded...

/Christian
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