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Martin
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GDI Memory Leak with UltraCombo
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Hi,

Recently, one of my customer have experienced a memory leak because of the maximum GDI Objects that Windows XP accept; 10 000 before throwing a OutOfMemoryException.

I started searching in my framework and found a lot of leaks but not enough after many corrections.

I have created a small project with no dependencies except the framework of Microsoft and a couple of librairies of Infragistics to see if the problem can also be from Infragistics controls.

I have created a form with just one control; a UltraCombo.

This form is open as MdiChild of another form of type MdiParent.

When I open and close many times the MdiChild, the GDI Objects never stop to increase about 2 GDI Objects each time I close the form.

When I try with many controls of Microsoft like Textbox, Checkbox, label, etc... the number of GDI Objects always return to the original number.

Furthermore, when I click the dropdown button (And I have no datasource defined for the control), the GDI Objects grow from 20 and when I close the form, this number don't goes down.

As example, when I start the application, I have 54 GDI Objects. When I open the MdiChild, this number rises 72. If I close the form, the number goes down to 67. If I reopen again the MdiChild, the number of GDI Objects is now 74 and when I close it, it goes down 69. And it grow like that each time I open and close the form. If I open the drop down list, the number grow of increase of 10 and event if I close the form, the number of GDI Objects is now 86 (74 + 10 + 2)

My conclusion is that the UltraCombo have a memory leak. A small one but with many UltraCombo controls in the same form like in many of my real projects, this can be a problem if the user works many hours while opening and closing many forms that contains theses controls.

I don't try with UltraGrid and I will wait for your answer; recommandation...

Thank you.

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