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.NET Forum / Windows Forms / WinForm General / March 2007Checking for null icon
If I create a form, not supplying an icon, if I get the value of the Icon property I get the default icon back (even though no icon is being displayed in the form). How can I determine whether the icon is set in a form or not? I have been trying using PInvoke with Win32 APIs with no success. really catchy. You can't set icon null for a Form. Only way is to see if it is default or not VJ > If I create a form, not supplying an icon, if I get the value of the Icon > property I get the default icon back (even though no icon is being > displayed in the form). How can I determine whether the icon is set in a > form or not? I have been trying using PInvoke with Win32 APIs with no > success. So the follow up question is "how can I tell that the Icon returned by System.Windows.Forms.Form.Icon is the default icon or not?" It doesn't have to be a neat solution, as I only need this information in NUnit test code. I guess I would have to do something like create a dummy form and compare handles (assuming that the handle is the same for all instances of the icon in all forms). > really catchy. You can't set icon null for a Form. Only way is to see if > it is default or not [quoted text clipped - 6 lines] >> form or not? I have been trying using PInvoke with Win32 APIs with no >> success. Oh no Clive.. that sounds a hack.. may not work. So yours is a test bed app that says oops you missed a icon for the Form?.. ahh... Did u google and see if you get anything? - keep the handle as last resort! (sometimes hack is a good practice, although I hate it) VJ > So the follow up question is "how can I tell that the Icon returned by > System.Windows.Forms.Form.Icon is the default icon or not?" It doesn't [quoted text clipped - 13 lines] >>> form or not? I have been trying using PInvoke with Win32 APIs with no >>> success. Actually I'm looking to check whether a form which *shouldn't* have an icon displayed (it has FormBorderStyle = FixedDialog and the icon is not set, which means no icon is displayed, not even the default one) has *not* accidentally acquired one. We have localised forms, which means that the visual designer will always modify the InitializeComponent to set the Icon to something from the .resx. Hence every time somebody modifies one of these localised forms, the visual designer adds back in code (thanks, Microsoft!) to explicitly set the icon to a copy of the default icon, and thus it now appears in the dialog. I want to write some NUnit tests to check when this has happened and someone has forgotten to correct it, 'cos I'm getting fed up. I Googled and couldn't find anything useful. I tried my nasty hack comparing the handle against a dummy form, and it appears to work, i.e. the handles are the same if I do not set the icon, but if I do, they are different. Yes, it is *very* yucky... > Oh no Clive.. that sounds a hack.. may not work. So yours is a test bed > app that says oops you missed a icon for the Form?.. ahh... [quoted text clipped - 21 lines] >>>> a form or not? I have been trying using PInvoke with Win32 APIs with no >>>> success. You could try name-hiding the "Icon" property. like this: class YourForm : Form { new public Icon Icon { get { return null; } set { } } } Name hiding is NOT polymorphic. If you have a Form reference, your code will not be executed. The InitializeCompoenent function calls this.Icon = (get something form resources); However, if you do this, the default icon still appears on the form. I think you may just be better off using the Form.ShowIcon property. --Matt > Actually I'm looking to check whether a form which *shouldn't* have an icon > displayed (it has FormBorderStyle = FixedDialog and the icon is not set, [quoted text clipped - 40 lines] > > - Show quoted text - ShowIcon: That's in 2.0 - we are still stuck with 1.1 unfortunately. Besides which, the docs say "This property has no effect if FormBorderStyle is set to FixedDialog.", which is the case in my situation. > You could try name-hiding the "Icon" property. > [quoted text clipped - 79 lines] >> >> - Show quoted text - Belivie it or not this exists from VB days.. and nothing has been done. Well maybe there is a inherent problem or reason to do.. I would love to learn. One possibility I can think of is the association of the ControlBox to the Icon, Maybe it has something to do with this. Handle sounds ok to me. VJ > If I create a form, not supplying an icon, if I get the value of the Icon > property I get the default icon back (even though no icon is being > displayed in the form). How can I determine whether the icon is set in a > form or not? I have been trying using PInvoke with Win32 APIs with no > success. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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