Re: XML parser for objective C

30 Sep 2005

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Here's a quick example both are the equivilent 1 uses the cocoa stuff the
other uses libxml2 directory

------ libxml2 example -----
- (IBAction)ItemLookup:(id)sender
{
if (strlen(amazon_id)==0)
{
NSAlert *alert = [NSAlert alertWithMessageText:@"You have do not have an
Amazon Subscriber ID (hint)amazon_id.h?"
    defaultButton:@"Oops" alternateButton:nil otherButton:nil
    informativeTextWithFormat:@"You have not configured the software."];
    [alert runModal];
    return;
}
NSArray *arobjs = [parcontroller arrangedObjects];
NSLog(@"objs=%@",arobjs);
NSLog(@"indexed=%@,   id=%d, %@",pselecteditemindex, [pselecteditemindex
firstIndex], [parcontroller selectionIndexes]);
    NSDictionary *ttt = (NSDictionary*)[ arobjs
objectAtIndex:[[parcontroller selectionIndexes] firstIndex]];
    NSLog(@"ttt=%@",ttt);
    NSArray *ptheasin=[ttt valueForKey:@"asin"];
NSLog(@"ptheasin = %@",ptheasin);
//    NSString *ptrial=[NSString stringWithFormat:@"ha ha %@",[ptheasin
objectAtIndex:0] ];

    NSString *ptheurl=[NSString
stringWithFormat:@"http://webservices.amazon.com/onca/xml?Service=AWSECommer
ceService&SubscriptionId="amazon_id"&Operation=ItemLookup&ItemId=%@&Response
Group=ItemAttributes,Images,Medium",ptheasin];

    //NSError *perr;
    NSURL *purl = [NSURL URLWithString:ptheurl];
    NSString *src_doc=[[NSString alloc] initWithContentsOfURL:purl
/*encoding:NSUTF8StringEncoding error:&perr*/];
    char *ssrcdoc = (char*)calloc(1,[src_doc cStringLength]+1);
    [src_doc getCString:ssrcdoc];
NSLog(@"xpath 0 %@",src_doc);
    xmlDocPtr doc=xmlParseMemory(ssrcdoc,strlen(ssrcdoc));
    xmlXPathContextPtr xctx=xmlXPathNewContext(doc);
    // previous value
"http://webservices.amazon.com/AWSECommerceService/2005-03-23"
    xmlXPathRegisterNs(xctx, (xmlChar*)"pih",
(xmlChar*)"http://webservices.amazon.com/AWSECommerceService/2005-07-26");

    xmlXPathObjectPtr tmpnode;
//NOTE need to put clean up of each xpath statement in. xmlobjectfree or
something like that

NSLog(@"xpath 1");
tmpnode =
xmlXPathEval((xmlChar*)"//pih:Items/pih:Item/pih:MediumImage/pih:URL/text()"
,xctx); //"/*/Items/Item/MediumImage/URL/text()"
    NSString *pimagepath=(tmpnode && tmpnode->nodesetval) ?[NSString
stringWithUTF8String:(const char*)tmpnode->nodesetval->nodeTab[0]->content]:
@"";
    xmlXPathFreeObject(tmpnode);
        NSLog(@"path=%@",pimagepath);
        [self setImage:pimagepath];
    NSLog(@"xpath 2");
    tmpnode=
xmlXPathEval((xmlChar*)"//pih:Items/pih:Item/pih:ItemAttributes/pih:Audience
Rating/text()",xctx);
        NSString *audiencerating=(tmpnode && tmpnode->nodesetval) ?[NSString
stringWithUTF8String:(const char*)tmpnode->nodesetval->nodeTab[0]->content]:
@"";
        xmlXPathFreeObject(tmpnode);

        NSLog(@"xpath 3");
        tmpnode =
xmlXPathEval((xmlChar*)"//pih:Items/pih:Item/pih:ItemAttributes/pih:RunningT
ime/text()",xctx);
        NSString *runningtime=(tmpnode && tmpnode->nodesetval) ?[NSString
stringWithUTF8String:(const char*)tmpnode->nodesetval->nodeTab[0]->content]:
@"";
        xmlXPathFreeObject(tmpnode);

        NSLog(@"xpath 4");
        tmpnode =
xmlXPathEval((xmlChar*)"//pih:Items/pih:Item/pih:ItemAttributes/pih:RunningT
ime/@Units",xctx);
        NSString *runningtimeunits=(tmpnode && tmpnode->nodesetval!=0 &&
tmpnode->nodesetval->nodeTab!=0) ?[NSString stringWithUTF8String:(const
char*)tmpnode->nodesetval->nodeTab[0]->children->content]: @"";
        NSString *playtime=[NSString stringWithFormat:@"%@ %@",runningtime,
runningtimeunits];
xmlXPathFreeObject(tmpnode);

        NSLog(@"xpath 5");
        tmpnode =
xmlXPathEval((xmlChar*)"//pih:Items/pih:Item/pih:ItemAttributes/pih:Director
/text()",xctx);
        NSString *pdirector = (tmpnode && tmpnode->nodesetval) ?[NSString
stringWithUTF8String:(const char*)tmpnode->nodesetval->nodeTab[0]->content]:
@"";
xmlXPathFreeObject(tmpnode);

NSLog(@"xpath 6");
        tmpnode =
xmlXPathEval((xmlChar*)"//pih:Items/pih:Item/pih:DetailPageURL/text()",xctx)
;
    NSString *pdetails = (tmpnode && tmpnode->nodesetval) ?[NSString
stringWithUTF8String:(const char*)tmpnode->nodesetval->nodeTab[0]->content]:
@"";
NSMutableArray *trump=    [NSMutableArray arrayWithArray:[parcontroller
selectedObjects]];
xmlXPathFreeObject(tmpnode);

NSLog(@"xpath 1");
[trump setValue:playtime forKey:@"runningtime"];
[trump setValue:pdirector forKey:@"director"];
[trump setValue:audiencerating forKey:@"audiencerating"];
[trump setValue:pdetails forKey:@"amazon"];
[parcontroller setSelectedObjects:trump];

xmlXPathFreeContext(xctx);
xmlFreeDoc(doc);

free(ssrcdoc);
}

------------------- cocoa example --------

- (IBAction)ItemLookup:(id)sender
{
if (strlen(amazon_id)==0)
{
NSAlert *alert = [NSAlert alertWithMessageText:@"You have do not have an
Amazon Subscriber ID (hint)amazon_id.h?"
    defaultButton:@"Oops" alternateButton:nil otherButton:nil
    informativeTextWithFormat:@"You have not configured the software."];
    [alert runModal];
    return;
}
    NSLog(@"indexd=%@",pselecteditemindex);
    NSDictionary *ttt = (NSDictionary*)[[parcontroller arrangedObjects]
objectsAtIndexes:pselecteditemindex];
    NSArray *ptheasin=[ttt valueForKey:@"asin"];

//    NSString *ptrial=[NSString stringWithFormat:@"ha ha %@",[ptheasin
objectAtIndex:0] ];

    NSString *ptheurl=[NSString
stringWithFormat:@"http://webservices.amazon.com/onca/xml?Service=AWSECommer
ceService&SubscriptionId="amazon_id"&Operation=ItemLookup&ItemId=%@&Response
Group=ItemAttributes,Images,Medium",[ptheasin objectAtIndex:0]];

    NSError *perr;
    NSURL *purl = [NSURL URLWithString:ptheurl];
    NSXMLDocument *doc=[[NSXMLDocument alloc] initWithContentsOfURL:purl
options:0 error:&perr];

NSArray *tmpnode;

tmpnode = [doc nodesForXPath:@"//Items/Item/MediumImage/URL" error:&perr];
    NSString *pimagepath=([tmpnode count]) ? [[tmpnode objectAtIndex:0]
stringValue] : @"";
        NSLog(@"path=%@",pimagepath);
        [self setImage:pimagepath];

    tmpnode= [doc
nodesForXPath:@"//Items/Item/ItemAttributes/AudienceRating" error:&perr] ;
        NSString *audiencerating=([tmpnode count]) ? [[tmpnode
objectAtIndex:0] stringValue] : @"";

        tmpnode = [doc
nodesForXPath:@"//Items/Item/ItemAttributes/RunningTime" error:&perr];
        NSString *runningtime=([tmpnode count])?[[tmpnode objectAtIndex:0]
stringValue] :@"";

        tmpnode = [doc
nodesForXPath:@"//Items/Item/ItemAttributes/RunningTime/@Units"
error:&perr];
        NSString *runningtimeunits=([tmpnode count]) ?[[tmpnode
objectAtIndex:0] stringValue] : @"";
        NSString *playtime=[NSString stringWithFormat:@"%@ %@",runningtime,
runningtimeunits];

        tmpnode = [doc nodesForXPath:@"//Items/Item/ItemAttributes/Director"
error:&perr];
        NSString *pdirector = ([tmpnode count])?[[tmpnode objectAtIndex:0]
stringValue] : @"";

        tmpnode = [doc nodesForXPath:@"//Items/Item/DetailPageURL"
error:&perr];
    NSString *pdetails = ([tmpnode count]) ? [[tmpnode objectAtIndex:0]
stringValue] : @"";
NSMutableArray *trump=    [NSMutableArray arrayWithArray:[parcontroller
selectedObjects]];

[trump setValue:playtime forKey:@"runningtime"];
[trump setValue:pdirector forKey:@"director"];
[trump setValue:audiencerating forKey:@"audiencerating"];
[trump setValue:pdetails forKey:@"amazon"];
[parcontroller setSelectedObjects:trump];

}
...
From: David Chan <phoenix.chix@gmail.com>
Reply-To: David Chan <phoenix.chix@gmail.com>
Date: Fri, 30 Sep 2005 17:53:11 +0800
To: cocoa-dev@lists.apple.com
Subject: XML parser for objective C
Dear All,
I've just got my hands on objective C and cocoa and at the moment, I was
given task to parse some XML files using the objective C project I am
developing to get some attribute from the XML. I was given a folder of XML
parser library written in C, but I am not sure how to use that to parse the
XML files. Is there any sample code out there which I can refer to so that I
can have better idea of how to parse XML files from my objective C class?
Thanks a lot.
Regards
David
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