A required resource was unavailable

I am receiving this error when I use my scrollbar in the formview of my application.  There does not appear to be a pattern to produce the error except that it occurs when you attempt to scroll quickly.  Am I attempting to scroll too fast or what?  Any suggestion would be appreciated.

zeekial@osler.card.bgsm.edu
zeekialAsked:
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Tommy HuiEngineerCommented:
I would look into your window's code for handling WM_HSCROLL or WM_VSCROLL. Another possibility would be to look at WM_PAINT. There are many of these messages that will be generated whenever you scroll.

In the code, I would look for resource leaks. The most likely being GDI leaks. Remember that when you select something into a DC, save the return value from SelectObject and select that back into the DC when you're done. Otherwise, you will get leaks.


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mikeblasCommented:
The "A required resource was not found" message corresponds to the AFX_IDS_RESOURCE_EXCEPTION string resource provided by MFC. This string is presented in a message box by MFC when someone calls the ReportError() member on a CResourceException object.  A CResourceException is thrown whenever a resource-based function is called in MFC and fails.  For example, if you try to create a CPen in the constructor and the creation fails, you'll get the exception.

You should bracket calls that throw exceptions in your code with try/catch. There's lots of books and code samples that show how to do this properly. When you do it properly, you can react to critical error conditions in a sane way.

If you don't set up a try/catch handler and an exception is thrown, MFC's backstop try/catch handler will step in to prevent your application from crashing or abnormially terminating. MFC's default handler simply calls ReportError() on whatever exception was raised and leaves it at that.

I think your problem is that you're ignoring exceptions in error conditions, not that you're leaking resources. If you put a breakpoint on the CResourceException constructor, or on the AfxThrowResourceException() function, you should find out why it's called in short order. But the real fix is to catch and handle exceptions that your code might generate.

.B ekiM

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