用Objective-C编写一个字符串 [英] URLEncoding a string with Objective-C

问题描述

我试图对一个字符串进行URL编码以形成来自objective-c的GET请求。

  NSString * params = @'解码数据！'/ foo.bar:baz; 
 
 NSRunAlertPanel（@Error，[params urlEncoded]，@OK，nil，nil）; 
  

这是扩展NSString的类别

   - （NSString *）urlEncoded 
 {
 NSString * encoded =（NSString *）CFURLCreateStringByAddingPercentEscapes（
 NULL，
（CFStringRef）self，
 NULL，
（CFStringRef）@！*'\（）;：@& = + $，/？％＃[]％，
 kCFStringEncodingUTF8）; 
 return b; 
} 
  

所以我第一次运行它回到

  1606410046ecoded 1606410784ata2270.000000foo.bar0X1.001716P-1042baz 
  

在我再次运行之后，我立即得到

  1606410046ecoded 1606410944ata227369374562920703448982951250259562309742470533728899744288431318481119278377104028261651081181287077973859930826299575521579020410425419424562236383226511593137467590082636817579938932512039895040.000000foo.bar0X1.66E6156303225P + 771baz 
  

然后，如果我运行它，它回到第一个。非常奇怪。

如果params设置为@&或@我只是回来一个2（w / o的报价）在对话框中。

也有一种方法，我可以有％

解决方案

我认为 NSAlert 正在将％字符解释为以随机数据填充的字符串格式说明符。 NSLog 输出并且很好：

 ％27Decoded％20data％ 21％27％2Ffoo.bar％3Abaz 
  

此外，您的 -urlEncoded 类别方法。您可以使用包含创建的CF函数创建字符串，以便您负责发布该字符串。

   - （NSString *）urlEncoded 
 {
 CFStringRef urlString = CFURLCreateStringByAddingPercentEscapes（
 NULL，
（CFStringRef）self，
 NULL，
 （CFStringRef）@！*'\（）;：@& = + $，/？％＃[]％，
 kCFStringEncodingUTF8）; 
 return [（NSString *）urlString autorelease ]; 
} 
  

I'm trying to URL encode a string to form a GET request from objective-c.

NSString *params = @"'Decoded data!'/foo.bar:baz";

NSRunAlertPanel( @"Error", [params urlEncoded], @"OK", nil, nil );

This is the category extending NSString

    -(NSString *) urlEncoded
{
    NSString *encoded = (NSString *)CFURLCreateStringByAddingPercentEscapes(
                                                   NULL,
                                                   (CFStringRef)self,
                                                   NULL,
                                                   (CFStringRef)@"!*'\"();:@&=+$,/?%#[]% ",
                                                   kCFStringEncodingUTF8 );
    return encoded;
}

So the first time I run it I get back

1606410046ecoded          1606410784ata2270.000000foo.bar0X1.001716P-1042baz

from the dialog box.

Immediately after I run it again I get this

1606410046ecoded          1606410944ata227369374562920703448982951250259562309742470533728899744288431318481119278377104028261651081181287077973859930826299575521579020410425419424562236383226511593137467590082636817579938932512039895040.000000foo.bar0X1.66E6156303225P+771baz

Then if I run it AGAIN it goes back to the first one. It's really weird.

If params is set to @"&" or @" " I just get back a "2" (w/o the quotes) in the dialog box.

Also is there a way I can have the % signs be shown in the alert dialog?

Thanks

解决方案

I think the NSAlert is interpreting the % characters as string format specifiers which are being filled with random data. Just NSLog the output and it's fine:

%27Decoded%20data%21%27%2Ffoo.bar%3Abaz

Also, you have a memory leak in your -urlEncoded category method. You create the string using a CF function containing Create so you are responsible for releasing it.

-(NSString *) urlEncoded
{
   CFStringRef urlString = CFURLCreateStringByAddingPercentEscapes(
                                                   NULL,
                                                   (CFStringRef)self,
                                                   NULL,
                                                   (CFStringRef)@"!*'\"();:@&=+$,/?%#[]% ",
                                                   kCFStringEncodingUTF8 );
    return [(NSString *)urlString autorelease];
}

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