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Using the Forms Collection to Verify Whether a Form Is Loaded

When a form is referenced in code, it automatically loads the form into memory. An advantage of the Forms Collection is that it contains only forms that have been loaded into memory. This enables the programmer to test for a specific form by looping through the collection and testing the Name property of every item in the collection.

An example of this code is found in Listing 4.17.

LISTING 4.17
VERIFYING WHETHER A PARTICULAR FORM IS LOADED

Sub Command1_Click()
Dim frmCurr as Form
For each frmCurr in Forms
If frmCurr.Name = "Form3" Then
MsgBox "Form3 has been loaded"
End If
Next frmCurr
End Sub

This code declares a form variable for looping and then sets up the For...Each statement. Inside the For...Each statement is an If test. With this code you are looking through each item in the collection
and testing the property frmCurr.Name. This allows frmCurr to represent every form that is loaded in the collection. If the Name property is equal to Form3, a message box displays informing us that Form3 has been loaded into memory.

This code sample requires a project with at least three forms. The default form names are expected, and the Form_Load event is responsible for loading all forms into memory. Remember that if the forms are not loaded at the moment the code runs, they will not be included in the collection.

Using the forms collection topics

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