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问题 I'm looking for a way to find the name of the Windows default printer using unmanaged C++ (found plenty of .NET examples, but no success unmanaged). Thanks. 回答1: The following works great for printing with the win32api from C++ char szPrinterName[255]; unsigned long lPrinterNameLength; GetDefaultPrinter( szPrinterName, &lPrinterNameLength ); HDC hPrinterDC; hPrinterDC = CreateDC("WINSPOOL\0", szPrinterName, NULL, NULL); In the future instead of googling "unmanaged" try googling "win32

问题 This question already has answers here : “Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP (28 answers) Closed 5 years ago . I'm trying to set a multilungal website using cookie. Everything's fine but I'm having trouble setting a default language. I'm getting an error "undefined index" in php when i get to the root website without parameter. <?php if (isset ($_COOKIE['CHOIXlang']) && $_GET['langue'] != 'fr' && $_GET['langue'] != 'en' && $_GET[

问题 I'm a novice programmer and have developed a notepad replacement application for my own needs (with some more features). When I double click a .txt file (or a customizable extension such as .abc), I want the file to run in my application just like notepad. I read about File Association with programs but I didn't get much of it. Can someone point me to how I would do this? Just give me a few ideas, I would really like to do this and have an option for my users to set the application as the

问题 I have an current location annotation (blue dot) showing in mapkit. Annotation shows after taping the blue dot, how can I have the annotation showing by default?, when I start the view? whit out tapping the pin. - (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views { for(MKAnnotationView *annotationView in views) { if(annotationView.annotation == mv.userLocation) { self.mapView.userLocation.title= @"Current"; self.mapView.userLocation.subtitle= @"Location"; MKCoordinateRegion

问题 I have IBM's J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3) installed. After getting an OOM, the size of the heap dump is 383MB. How much heap does the JVM have? The reason why I ask is that a 400MB heap dump seems a bit much for the default 64MB heap that I expect but I didn't specify any -Xm options. Does J9 use a different default heap size? If so, how can I find out what it is? 回答1: According to the documentation, the default minimum and maximum heap sizes are platform-dependent. On most

问题 I got a default scoping like this which is dynamic: default_scope :conditions => ["departure_date >= ?", DateTime.current.beginning_of_day] When I use this code the first day is ok. Lets say first day is 28-03-2011 But the next day seems like it's still using "departure_date >= 28-03-2011" Is my default scoping being cached? 回答1: The problem is that that code is only being executed once , when your app is loaded, and thus the actual date isn't changing. You need to change it to load lazily:

问题 I'm trying to prevent the default Ctrl + MouseWheel zoom behavior in Chrome with JavaScript, for the other browsers I use preventDefault() and stopPropagation() in the callback function for mouse-wheel event and works perfect because the other browser always trigger a mouse-wheel event but Chrome does not. Reading the question How to catch Zoom event with GWT and Chrome I found that Ctrl + MouseWheel can be caught as a resize event but after zooming the page so I can't prevent the behavior

问题 Suppose I have the following code: interface HumanoidForm { default HumanoidForm reproduce() { <appropriate code for humanoid form reproduction> } } class Android extends Machine implements HumanoidForm { public HumanoidForm reproduce() { <appropriate code for android reproduction> // how to use HumanoidForm's default implementation here? } } Now suppose "appropriate code for android reproduction" is best described by using "appropriate code for humanoid form reproduction" as a sub-routine.

问题 If I have a class with an abstract method: abstract class Base { abstract void foo(); } and an interface that declares the same method with a default implementation: interface Inter { default void foo() { System.out.println("foo!"); } } do I need to provide an implementation in a class that implements/extends both? class Derived extends Base implements Inter { } It seems like this should work, but I get a compilation error that Derived is not abstract and does not override the abstract method

问题 When I pushed a git commit to my remote depository, this warning appeared: clyde-browns-computer-2:bloccit clydiscope$ git commit -m 'Installed gem faker and generated seed data' [seed-data fabb6ea] Installed gem faker and generated seed data 3 files changed, 26 insertions(+), 7 deletions(-) clyde-browns-computer-2:bloccit clydiscope$ git checkout master Switched to branch 'master' Your branch is up-to-date with 'origin/master'. clyde-browns-computer-2:bloccit clydiscope$ git merge seed-data