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Index › Programming Questions & Help › Syntax Questions › detect a missing resource file

kirk is Junior Member Offline Posts: 59 boston, ma, usa	detect a missing resource file? Dec 13th, 2007, 3:21am   So I know loadImage returns null if the image requested insn't there, but it still seems to crash my program when I test for null. How can I gracefully handle this situation?? (i.e. some kind of try catch, or some "isFileAvaialable()" function...)

antiplastik YaBB Moderator Offline Posts: 699 France

Re: detect a missing resource file? Reply #1 - Dec 13th, 2007, 7:39am   does it crash really with a NullPointerException? or just display a warning message? reference says : Quote: If an image is not loaded successfully, the null value is returned and an error message will be printed to the console. The error message does not halt the program, however the null value may cause a NullPointerException if your code does not check whether the value returned from loadImage() is null. http://processing.org/reference/loadImage_.html performing a basic test (!= null) avoids the throwing of a NullPointerException (however the warning message saying the image is missing is still displayed) : Code: PImage img = loadImage("image.png"); if (img != null) { image(img, 0, 0); }

mflux Senior Member Offline Posts: 388	Re: detect a missing resource file? Reply #2 - Dec 13th, 2007, 7:49am   You can also check for file existence before you load: Code: boolean fileExists(String absoluteFilePath){ File file = new File(absoluteFilePath); if(file.exists()) return true; else return false; } It's a bit silly, but it works.
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