On 06/05/2012 02:24, Alan Jump wrote:
Trying to massage an older package (not written by me) into functioning order. The issue I'm having is getting printing functionality to work. The code snippet in question:if platform.system() == 'Windows': try: import win32api except: print('* FAILED TO LOAD WINDOWS EXTENSION') return try: win32api.ShellExecute (0, "print", filename, None, ".", 0) except: print('* FAILED TO SEND PRINT TO WINDOWS PRINTER') return The output file is generated in a separate code section and the filename being passed has been verified, but I invariably get the message in the second exception. That tells me the win32api is being properly imported, but for some reason, it's throwing an exception when trying to write to the print device.
Some general advice for a start: you almost *never* want to use a general except: clause (ie without a specific exception class): it catches *everything* - including Ctrl-C. So, in the try-except around "import win32api" you just want to catch ImportErrors -- at least, I assume so. However, you've circumvented that particular issue by removing the except clause from your ShellExecute command. Contrary to Vernon's suggestion, that won't actually be using the DOS "print" command but rather passing the "print" verb along to the application which is registered against the filename in question via the Shell verb handling mechanism. It would be interesting to see the exact error message you get but permissions or UAC is definitely a possibility. Also, and this is where it gets messier, the "print" verb will, in most cases, go to the *default* printer on the machine you're on -- and with the default settings. It's possible that this isn't the printer you think it is. Some applications keep their own track of which printer you last used, so you might fail to realise which one is actually the default. If that is the case you might want to look at this: http://timgolden.me.uk/python/win32_how_do_i/print.html#shellexecute for a possible way to specify a printer. TJG _______________________________________________ python-win32 mailing list python-win32@python.org http://mail.python.org/mailman/listinfo/python-win32
