byref variables in ActiveX component events

byref variables in ActiveX component events

Question:
I am creating an ActiveX DLL and I want to be able to fire events that can be cancelled similiarly to cancelling the Unload event for a form. however, I notice that even though an argument (passed byRef) can be included in the event declaration, there is not an explicit way to reference the argument in the ActiveX component after the event has fired?to then process the Cancel argument. See the included code:

ActiveX component codeOption ExplicitPublic Event WillFire(Cancel As Boolean)Public Sub myMethod(Cancel As Boolean)    RaiseEvent WillFire(False)    MsgBox "Event has Fired"End SubClient codeOption ExplicitPrivate WithEvents myObject As CObjectPrivate Sub btnExample_Click()    Set myObject = New CObject    myObject.myMethod FalseEnd SubPrivate Sub myObject_MethodHasFired()    MsgBox "Object Event has Fired"End SubPrivate Sub myObject_MethodWillFire(Cancel As Boolean)    'if some condition exists then        ' set cancel flag for the object method        Cancel = True    'endifEnd Sub

My question is: How can I include a byRef argument in my Event Declaration and evaluate that same argument in the ActiveX component once the event has fired?

Answer:
You must pass a ByRef variable when you raise the event, because that is the variable that is passed to the client’s event procedure:

Public Event WillFire(Cancel As Boolean)Public Sub myMethod()Dim b as boolean    RaiseEvent WillFire(b)	If b=true then	    MsgBox "Event has not Fired"	Else	    MsgBox "Event has Fired"	End IfEnd Sub

Try enclosing the b variable in two sets of parenthesis, ((b)), this passes the variable ByVal.

Share the Post:
XDR solutions

The Benefits of Using XDR Solutions

May 24, 2023

Cybercriminals constantly adapt their strategies, developing newer, more powerful, and intelligent ways to attack your network. Since security professionals must innovate as well, more conventional endpoint detection solutions have evolved

AI is revolutionizing fraud detection

How AI is Revolutionizing Fraud Detection

May 23, 2023

Artificial intelligence – commonly known as AI – means a form of technology with multiple uses. As a result, it has become extremely valuable to a number of businesses across

AI innovation

Companies Leading AI Innovation in 2023

May 22, 2023

Artificial intelligence (AI) has been transforming industries and revolutionizing business operations. AI’s potential to enhance efficiency and productivity has become crucial to many businesses. As we move into 2023, several

data fivetran pricing

Fivetran Pricing Explained

May 17, 2023

One of the biggest trends of the 21st century is the massive surge in analytics. Analytics is the process of utilizing data to drive future decision-making. With so much of

kubernetes logging

Kubernetes Logging: What You Need to Know

May 16, 2023

Kubernetes from Google is one of the most popular open-source and free container management solutions made to make managing and deploying applications easier. It has a solid architecture that makes

ransomware cyber attack

Why Is Ransomware Such a Major Threat?

May 15, 2023

One of the most significant cyber threats faced by modern organizations is a ransomware attack. Ransomware attacks have grown in both sophistication and frequency over the past few years, forcing

data dictionary

Tools You Need to Make a Data Dictionary

May 12, 2023

Data dictionaries are crucial for organizations of all sizes that deal with large amounts of data. they are centralized repositories of all the data in organizations, including metadata such as

Show More