data-conversion

问题 I want to display numbers in a std::vector<unsigned char> on a screen, but on its way to the recipient, I need to stuff these numbers into a std::string . Whatever I tried ( atoi , reinterpret_cast , string.c_str() ...), gave me either a nonsense, or a letter representation of those original numbers - i.e. their corresponding ascii characters. So how do I easily (preferably standard method) convert vector<unsigned char> {1,2,3} into a string "1-2-3" ? In the Original Post (later edited) I

问题 I'm trying to make my dataset correspond to this example: var family = [{ "name" : "Jason", "age" : "24", "gender" : "male" }, { "name" : "Kyle", "age" : "21", "gender" : "male" }]; I have a Map<String, HashSet<String>> of Names and unique alpha-numeric values correponding to specific entities to which those names could refer, let's call these entry items "IDs". So for instance, Fyodor Mikhailovich Dostoyevsky would perhaps be related to the ID Q626 , because that's a very specific reference,

问题 I have a byte array read over a network connection that I need to transform into a String without any encoding, that is, simply by treating each byte as the low end of a character and leaving the high end zero. I also need to do the converse where I know that the high end of the character will always be zero. Searching the web yields several similar questions that have all got responses indicating that the original data source must be changed. This is not an option so please don't suggest it.

问题 I have a pandas data frame with multiple columns and I would like to construct a dict from two columns: one as the dict's keys and the other as the dict's values. How can I do that? Dataframe: area count co tp DE Lake 10 7 Forest 20 5 FR Lake 30 2 Forest 40 3 I need to define area as key, count as value in dict. Thank you in advance. 回答1: If lakes is your DataFrame , you can do something like area_dict = dict(zip(lakes.area, lakes.count)) 回答2: With pandas it can be done as: If lakes is your

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: converting long string to date I need to convert long date value to mm/dd/yyyy format.my long value is strDate1="1346524199000" please help me 回答1: Refer Below code which give the date in String form. import java.text.SimpleDateFormat; import java.util.Date; public class Test{ public static void main(String[] args) { long val = 1346524199000l; Date date=new Date(val); SimpleDateFormat df2 = new SimpleDateFormat(

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed last year . Is there an existing application or library in Java which will allow me to convert a CSV data file to XML file? The XML tags would be provided through possibly the first row containing column headings. 回答1: Maybe this might help: JSefa You can read CSV file with this tool and serialize it to XML. 回答2: As the

问题 I'm reading a binary file like this: InputStream in = new FileInputStream( file ); byte[] buffer = new byte[1024]; while( ( in.read(buffer ) > -1 ) { int a = // ??? } What I want to do it to read up to 4 bytes and create a int value from those but, I don't know how to do it. I kind of feel like I have to grab 4 bytes at a time, and perform one "byte" operation ( like >> << >> & FF and stuff like that ) to create the new int What's the idiom for this? EDIT Ooops this turn out to be a bit more

问题 I have a list of dictionaries that looks something like this: toCSV = [{'name':'bob','age':25,'weight':200},{'name':'jim','age':31,'weight':180}] What should I do to convert this to a csv file that looks something like this: name,age,weight bob,25,200 jim,31,180 回答1: import csv toCSV = [{'name':'bob','age':25,'weight':200}, {'name':'jim','age':31,'weight':180}] keys = toCSV[0].keys() with open('people.csv', 'wb') as output_file: dict_writer = csv.DictWriter(output_file, keys) dict_writer

问题 How do I convert an array to a list in Java? I used the Arrays.asList() but the behavior (and signature) somehow changed from Java SE 1.4.2 (docs now in archive) to 8 and most snippets I found on the web use the 1.4.2 behaviour. For example: int[] spam = new int[] { 1, 2, 3 }; Arrays.asList(spam) on 1.4.2 returns a list containing the elements 1, 2, 3 on 1.5.0+ returns a list containing the array spam In many cases it should be easy to detect, but sometimes it can slip unnoticed: Assert

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . I was wondering how one would get the Text representation of a series of bytes in PHP? (Basically, the PHP version of C#'s Encoding.getString(string s) method.) I've been scouring google, and I can find how to