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App Inventor 2 列表代码块 · App Inventor 2 中文网

...top:40%; left:5px; width:200px; height:500px; display: none;}@media screen and (max-width: 700px) { #free_v { top:200%; }}
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opengl: glFlush() vs. glFinish()

...rouble distinguishing the practical difference between calling glFlush() and glFinish() . 8 Answers ...
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What's the dSYM and how to use it? (iOS SDK)

...es. I guess this is a debugging related file, but I don't know what it is, and how to use it. 2 Answers ...
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Get unique values from a list in python [duplicate]

... mylist = ['nowplaying', 'PBS', 'PBS', 'nowplaying', 'job', 'debate', 'thenandnow'] myset = set(mylist) print(myset) If you use it further as a list, you should convert it back to a list by doing: mynewlist = list(myset) Another possibility, probably faster would be to use a set from the beginn...
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techniques for obscuring sensitive strings in C++

... Basically, anyone with access to your program and a debugger can and will find the key in the application if they want to. But, if you just want to make sure the key doesn't show up when running strings on your binary, you could for instance make sure that the key is no...
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How to add property to a class dynamically?

... I suppose I should expand this answer, now that I'm older and wiser and know what's going on. Better late than never. You can add a property to a class dynamically. But that's the catch: you have to add it to the class. >>> class Foo(...
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Understand the “Decorator Pattern” with a real world example

...case of a pizza shop. In the pizza shop they will sell few pizza varieties and they will also provide toppings in the menu. Now imagine a situation wherein if the pizza shop has to provide prices for each combination of pizza and topping. Even if there are four basic pizzas and 8 different toppings,...
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How do I export UIImage array as a movie?

... Take a look at AVAssetWriter and the rest of the AVFoundation framework. The writer has an input of type AVAssetWriterInput, which in turn has a method called appendSampleBuffer: that lets you add individual frames to a video stream. Essentially you’ll...
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Can you call ko.applyBindings to bind a partial view?

I'm using KnockoutJS and have a main view and view model. I want a dialog (the jQuery UI one) to popup with another view which a separate child view model to be bound to. ...
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What's the algorithm to calculate aspect ratio?

...8:1. If so, what you need to do is find the greatest common divisor (GCD) and divide both values by that. The GCD is the highest number that evenly divides both numbers. So the GCD for 6 and 10 is 2, the GCD for 44 and 99 is 11. For example, a 1024x768 monitor has a GCD of 256. When you divide bot...