Article ID: 197956
Article Last Modified on 3/14/2005
APPLIES TO
- Microsoft Active Server Pages 4.0
- Microsoft Visual Basic 5.0 Learning Edition
- Microsoft Visual Basic 6.0 Learning Edition
- Microsoft Visual Basic 5.0 Professional Edition
- Microsoft Visual Basic 6.0 Professional Edition
- Microsoft Visual Basic 5.0 Enterprise Edition
- Microsoft Visual Basic 6.0 Enterprise Edition
- Microsoft Internet Information Server 4.0
- Microsoft Internet Information Services 5.0
This article was previously published under Q197956
SYMPTOMS
When passing a parameter to a COM Component's method in Active Server Pages (ASP), the following error occurs:
Or the value stored in the variable passed to the method is not changed.
CAUSE
VBScript will pass parameters to a method by value if the argument's data type is NOT declared as a variant and the parameter is passed by reference if the argument's data type is declared as variant by the method.
RESOLUTION
Parameters to be passed by reference to a method should always be declared as a variant data type by the method, while parameters to be passed by value can be declared as any type by the method.
STATUS
This behavior is by design.
MORE INFORMATION
Steps to Reproduce Behavior
- Create a Visual Basic ActiveX DLL Project called "ByRefProj."
- Add class module called "ByRefObj."
Implement the following method:
Public Sub ByRefMethod( ByRef strVal as String ) strVal = "This variable is passed by Reference" End Sub
Create an ASP Page that calls this Method:
<% Dim objTest, strByRefVal Set objTest = Server.CreateObject("ByRefProj.ByRefObj") objTest.ByRefMethod strByRefVal %>
- Run ASP. The following error occurs:
To correct this behavior:
Change the implementation of the method ByRefMethod as follows:
Public Sub ByRefMethod( ByRef strVal as Variant ) strVal = "This variable is passed by Reference" End Sub
Keywords: kberrmsg kbcodesnippet kbprb KB197956