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  4. Why use the correct exception type?

Why use the correct exception type?

Scheduled Pinned Locked Moved The Weird and The Wonderful
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  • C Chris Maunder

    Pretty much my assumption. "Let's try it and see what breaks".

    cheers Chris Maunder

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    raddevus
    wrote on last edited by
    #17

    Chris Maunder wrote:

    "Let's try it and see what breaks".

    Now you got my attention. Theory shmeory. Fire it up and try it out. :thumbsup: :laugh: Just like division by zero. People say it can't be done. Well... I at least want to try it a few times. :laugh:

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    • R raddevus

      Chris Maunder wrote:

      "Let's try it and see what breaks".

      Now you got my attention. Theory shmeory. Fire it up and try it out. :thumbsup: :laugh: Just like division by zero. People say it can't be done. Well... I at least want to try it a few times. :laugh:

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      Mycroft Holmes
      wrote on last edited by
      #18

      raddevus wrote:

      I at least want to try it a few times.

      Isn't that the definition of stupid - repeat the same action with the same settings and expect different results!

      Never underestimate the power of human stupidity RAH

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      • M Mycroft Holmes

        raddevus wrote:

        I at least want to try it a few times.

        Isn't that the definition of stupid - repeat the same action with the same settings and expect different results!

        Never underestimate the power of human stupidity RAH

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        raddevus
        wrote on last edited by
        #19

        I have found that in the Venn diagram there is no intersection between : Engineer & Humor :rolleyes: I've marked this comment appropriately as joke (as I should have on the other) to indicate that it is an _attempt_ at humor. :laugh:

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        • C Chris Maunder

          From the docs for Image.FromFile

          Quote:

          Exceptions OutOfMemoryException The file does not have a valid image format. -or- GDI+ does not support the pixel format of the file.

          ...and using something like UnsupportedFormatException is too hard? :doh:

          cheers Chris Maunder

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          Tim Carmichael
          wrote on last edited by
          #20

          In a moment of clarity, I recalled the answer: they are applying the Maunder Minimum. 8)

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          • C Chris Maunder

            From the docs for Image.FromFile

            Quote:

            Exceptions OutOfMemoryException The file does not have a valid image format. -or- GDI+ does not support the pixel format of the file.

            ...and using something like UnsupportedFormatException is too hard? :doh:

            cheers Chris Maunder

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            S Offline
            S Douglas
            wrote on last edited by
            #21

            Chris Maunder wrote:

            and using something like UnsupportedFormatException is too hard?

            Just be glad its not the usual, "Error occurred", Good luck figuring it out. :sigh:


            Common sense is admitting there is cause and effect and that you can exert some control over what you understand.

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            • C Chris Maunder

              From the docs for Image.FromFile

              Quote:

              Exceptions OutOfMemoryException The file does not have a valid image format. -or- GDI+ does not support the pixel format of the file.

              ...and using something like UnsupportedFormatException is too hard? :doh:

              cheers Chris Maunder

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              K Offline
              Kirill Illenseer
              wrote on last edited by
              #22

              Looks like it's the same reason why renaming an EXE to COM and trying to load it generates an "Out of memory" error: Implementation details leaking to the surface.

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              • C Chris Maunder

                In the case that affected me it was an attempt to load an SVG file which I discovered isn't supported. A simple check of filename or the first few bytes of the file would have found this. There's even a handy list[^] they could refer to.

                cheers Chris Maunder

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                Sentenryu
                wrote on last edited by
                #23

                Extensions aren't trustworthy, nothing guarantees the file is in the format it says it's on. The developer himself might have changed the extension to better suit his application, as evidenced by the shitload of formats that are just XML files, compressed or not, with a different extension (like SVG). As for the first few bytes, many formats have common prefixes (there's 2 or 3 exemples on the list you linked, but there's more), some of them don't even require the prefix to be present and others (like SVG) are encoded as text that can have yet another prefix (BOM). It's sad, but we can't trust the format markers when dealing with multiple formats.

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                • K Kirill Illenseer

                  Looks like it's the same reason why renaming an EXE to COM and trying to load it generates an "Out of memory" error: Implementation details leaking to the surface.

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                  Sentenryu
                  wrote on last edited by
                  #24

                  I mean, not really? COM files have a size limit because they behave different from EXE files (or rather, EXE files behave different, since COM is the original). When you try to load a COM file that exceeds this limit you're really running out of memory, before the code can even start to be executed. Could they read the file size and predict that? they couldn't (or just didn't, hard to say with stuff this old) when COM files where actually being used, so the current included loaders also don't. You don't really want to mess with those kinds of legacy systems, specially when they are useless for current developments and the alternative doesn't share the concerns. [COM file - Wikipedia](https://en.wikipedia.org/wiki/COM\_file#MS-DOS\_binary\_format)

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                  • M Mycroft Holmes

                    raddevus wrote:

                    I at least want to try it a few times.

                    Isn't that the definition of stupid - repeat the same action with the same settings and expect different results!

                    Never underestimate the power of human stupidity RAH

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                    B Offline
                    Bruce Patin
                    wrote on last edited by
                    #25

                    I grew up learning: "If at first you don't succeed, try, try again." That philosophy has done well for me. Now, when I suggest it to my teenage son, I get "The definition of insanity is trying the same thing over and over and expecting a different result." It's really a way to get out of trying to do a good job.

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                    • B Bruce Patin

                      I grew up learning: "If at first you don't succeed, try, try again." That philosophy has done well for me. Now, when I suggest it to my teenage son, I get "The definition of insanity is trying the same thing over and over and expecting a different result." It's really a way to get out of trying to do a good job.

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                      littleGreenDude
                      wrote on last edited by
                      #26

                      I prefer the "Theory of one" If it works for one case, it must work for them all. :-D

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                      • C Chris Maunder

                        From the docs for Image.FromFile

                        Quote:

                        Exceptions OutOfMemoryException The file does not have a valid image format. -or- GDI+ does not support the pixel format of the file.

                        ...and using something like UnsupportedFormatException is too hard? :doh:

                        cheers Chris Maunder

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                        C Offline
                        Christiaan van Bergen
                        wrote on last edited by
                        #27

                        Don't care, I always use

                        catch(Exception e){..}

                        That always works ;P

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                        • M Mycroft Holmes

                          raddevus wrote:

                          I at least want to try it a few times.

                          Isn't that the definition of stupid - repeat the same action with the same settings and expect different results!

                          Never underestimate the power of human stupidity RAH

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                          D Offline
                          Dr Walt Fair PE
                          wrote on last edited by
                          #28

                          Mycroft Holmes wrote:

                          sn't that the definition of stupid - repeat the same action with the same settings and expect different results!

                          It is stupid, until it works. Which will be just when I{m showing nmy wife that it won{t work.

                          CQ de W5ALT

                          Walt Fair, Jr., P. E. Comport Computing Specializing in Technical Engineering Software

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                          • P phil o

                            Could have been worse... A MysteriousException, or a ConfusingException instead.

                            "I'm neither for nor against, on the contrary." John Middle

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                            Smart K8
                            wrote on last edited by
                            #29

                            ...or even worse: GeneralException - exception that can be anything from anywhere.. sorry, no stack.

                            In order to understand stack overflow, you must first understand stack overflow.

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