| Title | Save and restore a form's size and position when the program starts and stops |
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| Keywords | SaveSetting, GetSetting, registry, position, size, persist, persistence, save, retore, Form_Load, Form_Unload |
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| Categories | Tips and Tricks |
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Private Const APP_NAME As String = "howto_persist_position"
Private Sub Form_Load()
' Restore the form's size and position.
Me.Move _
GetSetting(APP_NAME, "Settings", "Left", Me.Left), _
GetSetting(APP_NAME, "Settings", "Top", Me.Top), _
GetSetting(APP_NAME, "Settings", "Width", _
Me.Width), _
GetSetting(APP_NAME, "Settings", "Height", _
Me.Height)
End Sub
Private Sub Form_Unload(Cancel As Integer)
' Save the form's size and position.
SaveSetting APP_NAME, "Settings", "Left", Me.Left
SaveSetting APP_NAME, "Settings", "Top", Me.Top
SaveSetting APP_NAME, "Settings", "Width", Me.Width
SaveSetting APP_NAME, "Settings", "Height", Me.Height
End Sub
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This method is generally good enough but it has a couple of potential problems. First, it doesn't save changes unless the application ends normally. If it crashes, Form_Unload is never called so the current values are not saved. Most programmers don't count on their applications crashing but it will happen sooner or later.
Second, the values are saved in the registry. Depending on your operating system, that may mean that all uses get the same settings on the computer. For all operating systems it also means the a user moving to a different computer will not see the saved settings. If you need to worry about these issues, you can save the settings in a shared database indexed by user name.
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