Re: Escape xml with CFXMLCreateStringByEscapingEntities

Andreas Grosam Mon, 05 Dec 2011 11:14:14 -0800

On Dec 1, 2011, at 9:19 AM, Claude Saelens wrote:

> Hello,
> 
> I need to put XML fragments into another XML. Each time an XML fragment is 
> put into another XML it needs to be escaped to be send to backend a java 
> application. I used the function "CFXMLCreateStringByEscapingEntities" but it 
> seems it can only escape an XML fragment once, the second time strange 
> characters are added.
> 
> For this is wrote following method:
> 
> -(NSMutableString*)xmlEscape:(NSMutableString*)xmlString
> {
>       NSMutableString *aNSString = [NSMutableString 
> stringWithString:xmlString];
>       CFStringRef aCFString;
>       CFStringRef bCFString;
>       aCFString = CFStringCreateWithCString(NULL, [aNSString UTF8String], 
> NSUTF8StringEncoding);
>       bCFString = CFXMLCreateStringByEscapingEntities(kCFAllocatorDefault, 
> aCFString, NULL);
> 
>       NSMutableString *returnValue = [NSMutableString 
> stringWithString:(NSMutableString*)bCFString];
>       
>       CFRelease(aCFString);
>       CFRelease(bCFString);
>       
>       return returnValue;
> }
> 
> The result is as follow:
> 
> First fragment:
> 
> <item type="Struct">
> <item name="path">Links/lets&dance.jpg</item>
> <item name="spread_index">0</item>
> </item>
> <item type="Struct">
> <item name="path">Links/doubles_1/lets&dance.jpg</item>
> <item name="spread_index">0</item>
> </item>
> 
> Escaping this and put in a second fragment gives:
> 
> <item type="Struct">
> <item name="level_id">4_2</item>
> <item name="images" type="Array">&lt;item type=&quot;Struct&quot;&gt;
> &lt;item name=&quot;path&quot;&gt;Links/lets&amp;dance.jpg&lt;/item&gt;
> &lt;item name=&quot;spread_index&quot;&gt;0&lt;/item&gt;
> &lt;/item&gt;
> &lt;item type=&quot;Struct&quot;&gt;
> &lt;item 
> name=&quot;path&quot;&gt;Links/doubles_1/lets&amp;dance.jpg&lt;/item&gt;
> &lt;item name=&quot;spread_index&quot;&gt;0&lt;/item&gt;
> &lt;/item&gt;
> </item>
> </item>
> 
> Escaping this fragment again gives:
> 
> &lt;item type=&quot;Struct&quot;&gt;
> &lt;item name=&quot;level_id&quot;&gt;4_2&lt;/item&gt;
> &lt;item name=&quot;images&quot; type=&quot;Array&quot;&gt;قÄ-&amp;lt;قÄ،item 
> typeقÄ-=&amp;quot;قÄ،StructقÄ-&amp;quot;&amp;gt;قÄ،
> قÄ-&amp;lt;قÄ،item 
> nameقÄ-=&amp;quot;قÄ،pathقÄ-&amp;quot;&amp;gt;قÄ،Links/lets&amp;amp;dance.jpgقÄ-&amp;lt;/قÄ،itemقÄ-&amp;gt;قÄ،
> قÄ-&amp;lt;قÄ،item 
> nameقÄ-=&amp;quot;قÄ،spread_indexقÄ-&amp;quot;&amp;gt;قÄ،0قÄ-&amp;lt;/قÄ،itemقÄ-&amp;gt;قÄ،
> قÄ-&amp;lt;/قÄ،itemقÄ-&amp;gt;قÄ،
> قÄ-&amp;lt;قÄ،item typeقÄ-=&amp;quot;قÄ،StructقÄ-&amp;quot;&amp;gt;قÄ،
> قÄ-&amp;lt;قÄ،item 
> nameقÄ-=&amp;quot;قÄ،pathقÄ-&amp;quot;&amp;gt;قÄ،Links/doubles_1قÄ-/قÄ،lets&amp;amp;dance.jpgقÄ-&amp;lt;/قÄ،itemقÄ-&amp;gt;قÄ،
> قÄ-&amp;lt;قÄ،item 
> nameقÄ-=&amp;quot;قÄ،spread_indexقÄ-&amp;quot;&amp;gt;قÄ،0قÄ-&amp;lt;/قÄ،itemقÄ-&amp;gt;قÄ،
> قÄ-&amp;lt;/قÄ،itemقÄ-&amp;gt;قÄ،
> &lt;/item&gt;
> &lt;/item&gt;
> 
> 
> Has anyone a solution for this problem?
> 
> Thanks a lot for your help.



You didn't show the relevant code. (Your code above performs a couple of 
unnecessary copies).

On Lion 10.7.2,  using Xcode 4.2.1 with default Foundation Template, this works 
for me:


int main (int argc, const char * argv[])
{
    @autoreleasepool {
        
        CFStringRef input = CFSTR("<item type=\"Struct\">\n"
                                  "<item 
name=\"path\">Links/lets&dance.jpg</item>\n"
                                  "<item name=\"spread_index\">0</item>\n"
                                  "</item>\n"
                                  "<item type=\"Struct\">\n"
                                  "<item 
name=\"path\">Links/doubles_1/lets&dance.jpg</item>\n"
                                  "<item name=\"spread_index\">0</item>\n"
                                  "</item>");
        
        
        NSLog(@"input:\n%@\n\n", input);
        CFStringRef firstOut = CFXMLCreateStringByEscapingEntities(
                                                          kCFAllocatorDefault,
                                                          input,
                                                          NULL);
        NSLog(@"output:\n%@\n\n", (id)firstOut);
        
        
        NSString* format =  @"<item type=\"Struct\">\n"
                            @"<item name=\"level_id\">4_2</item>\n"
                            @"<item name=\"images\" type=\"Array\">%@</item>\n"
                            @"</item>";
        
        NSString* second = [NSString stringWithFormat:format, (id)firstOut];
        
        CFStringRef secondOut = CFXMLCreateStringByEscapingEntities(
                                                                   
kCFAllocatorDefault,
                                                                   
(CFStringRef)second,
                                                                   NULL);
        NSLog(@"secondOut:\n%@\n\n", (id)secondOut);

        CFRelease(firstOut);    
        CFRelease(secondOut);    
    }
    return 0;
}


2011-12-02 14:06:21.593 XMLEscape[61121:707] input:
<item type="Struct">
<item name="path">Links/lets&dance.jpg</item>
<item name="spread_index">0</item>
</item>
<item type="Struct">
<item name="path">Links/doubles_1/lets&dance.jpg</item>
<item name="spread_index">0</item>
</item>

2011-12-02 14:06:21.595 XMLEscape[61121:707] output:
&lt;item type=&quot;Struct&quot;&gt;
&lt;item name=&quot;path&quot;&gt;Links/lets&amp;dance.jpg&lt;/item&gt;
&lt;item name=&quot;spread_index&quot;&gt;0&lt;/item&gt;
&lt;/item&gt;
&lt;item type=&quot;Struct&quot;&gt;
&lt;item 
name=&quot;path&quot;&gt;Links/doubles_1/lets&amp;dance.jpg&lt;/item&gt;
&lt;item name=&quot;spread_index&quot;&gt;0&lt;/item&gt;
&lt;/item&gt;

2011-12-02 14:06:21.596 XMLEscape[61121:707] secondOut:
&lt;item type=&quot;Struct&quot;&gt;
&lt;item name=&quot;level_id&quot;&gt;4_2&lt;/item&gt;
&lt;item name=&quot;images&quot; type=&quot;Array&quot;&gt;&amp;lt;item 
type=&amp;quot;Struct&amp;quot;&amp;gt;
&amp;lt;item 
name=&amp;quot;path&amp;quot;&amp;gt;Links/lets&amp;amp;dance.jpg&amp;lt;/item&amp;gt;
&amp;lt;item name=&amp;quot;spread_index&amp;quot;&amp;gt;0&amp;lt;/item&amp;gt;
&amp;lt;/item&amp;gt;
&amp;lt;item type=&amp;quot;Struct&amp;quot;&amp;gt;
&amp;lt;item 
name=&amp;quot;path&amp;quot;&amp;gt;Links/doubles_1/lets&amp;amp;dance.jpg&amp;lt;/item&amp;gt;
&amp;lt;item name=&amp;quot;spread_index&amp;quot;&amp;gt;0&amp;lt;/item&amp;gt;
&amp;lt;/item&amp;gt;&lt;/item&gt;
&lt;/item&gt;


Regards
Andreas

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