iPhone：如何将CSV格式转换为NSData或NSString？ [英] iPhone : How to convert CSV format into NSData or NSString?

问题描述

我正在制作一个需要当前股价的iPhone应用程序。

我从以下链接接收CSV格式的数据。

http：/ /finance.yahoo.com/d/quotes.csv?s=RHT+MSFT&f=sb2b3jk

可以将CSV格式转换为NSData或NSString格式？

如果是，如何将CSV格式转换为NSData格式或NSString格式？

请帮助和建议您可以采取什么措施？

感谢

解决方案

不要重新发明车轮： CHCSVParser 是以Objective-C编写的本机CSV解析器。它有正确的处理引用字段，转义字符等等。它有方便的方法（ + [NSArray arrayWithContentsOfCSVFile：...] ）和块文件读取，内存警告。

这里（或多或少）如何使用它。那个CSV文件是远程复杂的事情有点，但不是太多（你必须将URL的内容下载到一个字符串，然后将该字符串传递给解析器）。

  #importCHCSV.h
 
 int main（int argc，const char * argv []）{
 NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; 
 NSString * csv = [NSString stringWithContentsOfURL：[NSURL URLWithString：@http://download.finance.yahoo.com/d/quotes.csv?s=RHT+MSFT&f=sb2b3jk]]; 
 NSArray * rows = [NSArray arrayWithContentsOfCSVString：csv encoding：NSUTF8StringEncoding error：nil]; 
 //你也可以：rows = [csv CSVComponents]; 
 NSLog（@rows：％@，rows）; 
 [pool drain]; 
 return 0; 
} 
  

此日志：

  2010-12-23 09：05：44.431 CHCSVParser [99377：a0f]（
（
 RHT，
46.48，
46.46，
26.51，
49.00
），
（
 MSFT，
28.23，
 28.22，
22.73，
31.58
），
（

）
） / code> 

它返回 NSArray / code> of NSStrings 。

I am making an iPhone app which requires the current Stock Prices.

I am receiving the data in CSV format from a link given below.

http://finance.yahoo.com/d/quotes.csv?s=RHT+MSFT&f=sb2b3jk

Is it possible to convert the CSV format to NSData or NSString format?

If Yes, how can I convert the CSV format to NSData format or NSString format?

What can be done?

What can be the other alternatives for this?

Please Help and Suggest

Thanks

解决方案

Don't re-invent the wheel: CHCSVParser is a native CSV parser written in Objective-C. It properly handles quoted fields, escaped characters, etc. It has convenience methods (+[NSArray arrayWithContentsOfCSVFile:...]) and chunks the file reading so as not to produce low memory warnings.

Here's (more or less) how you'd use it. That the CSV file is remote complicates things a little bit, but not much (you have to download the contents of the URL into a string, and then pass that string into the parser).

#import "CHCSV.h"

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    NSString * csv = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://download.finance.yahoo.com/d/quotes.csv?s=RHT+MSFT&f=sb2b3jk"]];
    NSArray * rows = [NSArray arrayWithContentsOfCSVString:csv encoding:NSUTF8StringEncoding error:nil];
    //You can also do:  rows = [csv CSVComponents];
    NSLog(@"rows: %@", rows);
    [pool drain];
    return 0;
}

This logs:

2010-12-23 09:05:44.431 CHCSVParser[99377:a0f] (
        (
        RHT,
        "46.48",
        "46.46",
        "26.51",
        "49.00"
    ),
        (
        MSFT,
        "28.23",
        "28.22",
        "22.73",
        "31.58"
    ),
        (
        ""
    )
)

It returns an NSArray of NSArrays of NSStrings.

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