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Socket 错误返回码详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...在有可能發生這種錯誤的函式呼叫前加上WSAIsBlocking()判斷是否有阻攔式函式正在執行。如果有的話，我們可能需要將正在進行的阻攔式函式取消掉，或是將目前想要做的事取消掉。
WSAEALREADY (10037) 函式作用已完成
這個錯誤...
iOS 6: How do I restrict some views to portrait and allow others to rotate?
I have an iPhone app that uses a UINavigationController to present a drill-down interface: First one view, then another, up to four levels deep. I want the first three views restricted to portrait orientation and only the last view should be allowed to rotate to landscape. When returning from the ...
How to detect if app is being built for device or simulator in Swift
...runtime check, you can inspect the TARGET_OS_SIMULATOR variable (or TARGET_IPHONE_SIMULATOR in iOS 8 and below), which is truthy on a simulator.
Please notice that this is different and slightly more limited than using a preprocessor flag. For instance you won't be able to use it in place where a i...
Error when testing on iOS simulator: Couldn't register with the bootstrap server
..., and the user launchd. I just repeated the wedge by running an app in the iphone simulator, having it stopped within gdb, and then doing a build and run to the ipad simulator. It seems to be sensitive to switching simulators (iOS 4.3/iOS 5, iPad/iPhone). It doesn't happen all the time but fairly fr...
Test iOS app on device without apple developer program or jailbreak
...vice. Then it worked. Also remember to allow installing such apps on your iPhone by going to Settings -> General -> Profile You will see your dev account. Tap it. You should see the app listed there. Tap on it. Tap "Trust (name here)"
– mutp
Sep 19 '15 a...
MongoDB数据导出导入工具：mongoexport,mongoimport - 大数据 & AI - 清泛...
...入
-file：指明要导入的文件
查询students集合，验证导入是否成功：
> db.students.find()
{ "_id" : ObjectId("503266029355c632cd118ad8"), "classid" : 1, "name" : "kobe", "age" : 20 }
{ "_id" : ObjectId("503266029355c632cd118ad9"), "classid" : 1, "name" : "nash", "age" : 23 ...
What is Objective C++? [closed]
...lasses).
Yes, you can use this language in Xcode to develop for Mac OS X, iPhone/iPodTouch, iPad. It works very well.
You don't have to do anything weird in your project to use Objective-C++. Just name your Objective-C files with the extension .mm (instead of .m) and you are good to go.
It is my ...
How big should a UIBarButtonItem image be?
...lder devices like iPad 2 / Mini, 50px square for most current devices like iPhone 8 or iPad, and 75px square for Retina HD devices (the iPhone 6/7/8 Plus, or iPhone X). Asset catalogs will help immensely in keeping the different asset sizes organized (and Xcode can even generate them from vector sou...
大数据：用数据指导APP运营 - 资讯 - 清泛网 - 专注C/C++及内核技术
...系的。很简单的一个道理：
两个活动，一个活动送100台iPhone6，一个活动送1台iPhone6，哪个效果会好？
做运营的同学，请一定要认真的去评估每一个运营动作背后的成本。
而所谓“收益”，并不等价于“收入”，获得金钱是收...
Using NSPredicate to filter an NSArray based on NSDictionary keys
...
Does NSPredicate work on the iPhone? It works great on the sim but running it on the iPhone gives an error that the NSPredicate class could not be found.
– lostInTransit
Sep 25 '09 at 4:28
...