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App Inventor 2 扩展 · App Inventor 2 中文网
...er importing an extension, make sure to restart the companion app, else an error may occur.
Figure 3: An imported extension shown in components palette
2.2 Some sample extensions to try
Here are some sample extension components to experiment with. You can find these in the MIT App Inventor E...
Detecting when the 'back' button is pressed on a navbar
...tionItem.leftBarButtonItem = nil
someData.saveInBackground { (success, error) -> Void in
if success {
self.navigationController?.popViewControllerAnimated(true)
// Don't forget to re-enable the interactive gesture
self.navigationController?.interact...
std::unique_ptr with an incomplete type won't compile
...ile, but declaring an object of that type anywhere results in the original error ("invalid application of 'sizeof'...").
– Jeff Trull
Sep 30 '12 at 19:45
40
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When is it right for a constructor to throw an exception?
... constructor knows that the object is not ready to be used and there is an error somewhere that needs to be fixed.
Objects that are half-initialised and half-dead just cause problems and issues, as there really is no way for the caller to know. I'd rather have my constructor throw an error when thi...
How to find/identify large commits in git history?
...
One liner to do same thing: git gc && join -e ERROR -a 2 -j 1 -o 2.1,2.3,1.2 --check-order <( git rev-list --objects --all | sort -k 1 ) <( git verify-pack -v .git/objects/pack/pack-*.idx | gawk '( NF == 5 && $2 == "blob" ){print}' | sort -k1 ) | sort -k2gr...
async/await - when to return a Task vs void?
...I got clear idea from this statements.
Async void methods have different error-handling semantics. When an exception is thrown out of an async Task or async Task method, that exception is captured and placed on the Task object. With async void methods, there is no Task object, so any exceptions th...
How to call a method defined in an AngularJS directive?
... the directive's methods and don't have a control attr will start throwing errors about not being able to set attributes on undefined
– CheapSteaks
Mar 16 '14 at 0:55
...
Why does SSL handshake give 'Could not generate DH keypair' exception?
...rovider.BouncyCastleProvider did work better, putting it on 1. resulted in errors in default software.
– TinusSky
Jul 7 '15 at 13:42
1
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How to exclude this / current / dot folder from find “type d”
...For example, if you try find dir/* -type d -exec rmdir {} \;, you will see errors.
– plhn
Mar 24 '17 at 3:05
...
What is the proper way to re-throw an exception in C#? [duplicate]
...ew Exception ("Put more context here", ex)
}
This preserves the original error, but allows you to put more context, such as an object ID, a connection string, stuff like that. Often my exception reporting tool will have 5 chained exceptions to report, each reporting more detail.
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