#29973 [Fbk->NoF]: Comparing COM object variable with NULL throws an exception

ID: 29973 Updated by: sniper@php.net Reported By: tetikr at spytech dot cz -Status: Feedback +Status: No Feedback Bug Type: COM related Operating System: Win2000 PHP Version: 5.0.1 Assigned To: wez New Comment: No feedback was provided. The bug is being suspended because we assume that you are no longer experiencing the problem. If this is not the case and you are able to provide the information that was requested earlier, please do so and change the status of the bug back to "Open". Thank you. Previous Comments: ------------------------------------------------------------------------ [2005-03-19 21:49:35] sniper@php.net Please try using this CVS snapshot: http://snaps.php.net/php5-latest.tar.gz For Windows: http://snaps.php.net/win32/php5-win32-latest.zip ------------------------------------------------------------------------ [2004-09-09 21:25:51] wez@php.net in this case you should be doing: try { $a = new COM(...); // use it here } catch (exception $e) { // failed to create it } in other cases, where you have been passed the object, use is_object() to check if it is valid. I'll see if I can fix the shorthand "if (!$a)" syntax someone in the next month. ------------------------------------------------------------------------ [2004-09-06 14:27:03] tetikr at spytech dot cz Some objects work and some not. The following code creates an object that works not. It throws a COM exception "Member not found". Test it for yourself, I hope it will fail :-) --------------------------------- $o = new COM("WScript.Shell"); if (!$o) /* dummy */ ; else echo $o->CurrentDirectory; --------------------------------- ------------------------------------------------------------------------ [2004-09-06 08:06:19] derick@php.net What is the full error message? ------------------------------------------------------------------------ [2004-09-03 19:08:58] tetikr at spytech dot cz Description: ------------ Comparing COM object variable with NULL throws an exception Reproduce code: --------------- $a = new COM(.....); if (!$a) { ...... } else { ..... } Expected result: ---------------- If $a is non null, I expect the ELSE block to be performed. Actual result: -------------- PHP throws an exception when trying to evaluate !$a. I think it tries to access the default COM object's property. If this is a valid behavior, how should I test for null? ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=29973&edit=1