identifier

问题 I have got this error on the line where the void is it says undeclared identifier for sliderDidChange can some one please help me with this i can;t find any answers. h. file // // LightViewController.h // Flash Light // // Created by John Whitney on 12-07-27. // Copyright (c) 2012 Perfect Programs. All rights reserved. // #import <UIKit/UIKit.h> #import <AVFoundation/AVFoundation.h> @interface LightViewController : UIViewController { IBOutlet UISlider *slider; IBOutlet UISlider *theslider;

问题 I want to be able to detect whether an image is transparent or not using the Imagick PHP extension. So far, the only luck I've been having is to run the exec() / some other command, and use the ImageMagick command line tool to achieve this. Here's what I mean: exec("identify -verbose example_transparent_image.png | grep \"Alpha\"", $output); $is_transparent = !empty($output) ? true : false; The logic is simple. Do a verbose check on the image in question: if the output contains any alpha

问题 I have the following definition for an Identifier: Identifier --> letter{ letter| digit} Basically I have an identifier function that gets a string from a file and tests it to make sure that it's a valid identifier as defined above. I've tried this: if re.match('\w+(\w\d)?', i): return True else: return False but when I run my program every time it meets an integer it thinks that it's a valid identifier. For example c = 0 ; it prints c as a valid identifier which is fine, but it also prints 0

问题 I'm using in-App purchases in my App on behave of getting some sounds from the App to the iPhone as a ringtone. I've used 'Consumable' as the type for in-App purchase so that the user would be able to buy a ringtone and download it directly. However this App got rejected by Apple because they want this function to be non-Consumable (so you would be able to retrieve this ringtone more than once). I only don't know how to set this up in my App because there are more than 200 possible ringtones.

问题 I have a data table in sql server 2008 that I would like to select the top 1 out of each identifier: The results shld looks like this during before and after: Thus it should only select the 1st results if the same identifier do exist. Thanks a lot. 回答1: Just distinct them: select distinct [primary identifier] from tablename Or by grouping: select [primary identifier] from tablename group by [primary identifier] If more columns exist you can rank rows with window function: ;with cte as(select

问题 What can I extract from computer to identify it. MAC address, Hard disk serial number, then? 回答1: I don't have a code to show you right now but i have done similar things, by cominning CPU Id and Harddrive serial No, that's how you get the unique no; try this; http://www.vcskicks.com/hardware_id.php 来源： https://stackoverflow.com/questions/15546151/how-to-retrieve-unique-identification-from-computer

问题 With syntax highlighting enabled, it's distracting while reading code like answer to this question with new used as a variable name. I'm trying to think of a reason why only a subset of keywords would be reserved and can't come up with a good one. Edit: Alternate title for this question: Why are Go's predeclared identifiers not reserved ? 回答1: That's because new and make aren't really keywords, but built-in functions. If you examine the full list of the reserved keywords, you won't see len or

问题 Disclaimer: This is a follow-on question from my other question about NServiceBus which was answered very thoroughly. My current question is this: If a website is built to be 'dumb' like the article referred to, above, suggests then how does the following scenario work? A user registers on a website by filling out a form with relevant details. When the user clicks the 'submit' button on the form the web application takes the form data and creates a message which it sends to the application

问题 exception div; fun f(x,y) = let val before = 2.0 * x + 3.0 * y in (before + (1.0 / (if x > 0.0001 then x else raise div)) + 2.0 / y) handle div => before / 6.0 end This code yields some compile error. That is e.sml:4.8-4.14 Error: expression or pattern begins with infix identifier "before" e.sml:6.8-6.14 Error: expression or pattern begins with infix identifier "before" e.sml:6.57-6.60 Error: expression or pattern begins with infix identifier "div" e.sml:6.81-6.84 Error: expression or pattern

问题 I have a class like this: class ExampleClass { private: int _id; string _data; public: ExampleClass(const string &str) { _data = str; } ~ExampleClass() { } //and so on... } How can I add unique(!) integer identifier (_id) for every instance of the class without using global variable? 回答1: Use a private static member int, is shared among all instance of the class. In static int in the constructor just increment it, and save it's value to your id member; class ExampleClass { private: int _id;