CODEWITHSUNDEEP
objective-cxmliosnsxmlparsergoogle-api
brussels0828
brussels0828

Reputation: 344

Parsing Google Search API XML results via iOS Objective-C 2.0

Here are the XML results from my Google API request:

<entry gd:kind="shopping#product">
<author>
<name>Bloomingdale&apos;s</name>
</author>
<title>7 For All Mankind &quot;Ginger&quot; Wide Leg Jeans in Lightweight Mercer Wash</title>
<s:product>
<s:author>
<s:name>Bloomingdale&apos;s</s:name>
<s:accountId>8020</s:accountId>
</s:author>
<s:title>7 For All Mankind &quot;Ginger&quot; Wide Leg Jeans in Lightweight Mercer Wash</s:title>
<s:description>7 for all Mankind &quot;Ginger&quot; jeans in lightweight mercer wash. A wide-leg fit.</s:description>
<s:brand>7 For All Mankind</s:brand>
<s:gtin>12345680753539</s:gtin>
<s:images>
<s:image link="http://images.bloomingdales.com/is/image/BLM/products/2/optimized/1144762_fpx.tif?wid=287&amp;qlt=90"/>
<s:image link="http://1.0.0.0/"/>
<s:image link="http://0.0.0.5/"/>
</s:images>
</s:product>
</entry>

Here is my NSXMLParser code to parse the XML:

@implementation ItemViewController

- (void)parser:(NSXMLParser *)parser  
didStartElement:(NSString *)elementName  
namespaceURI:(NSString *)namespaceURI  
qualifiedName:(NSString *)qName  
attributes:(NSDictionary *)attributeDict
{  
if ([elementName isEqual:@"s:product"]) {  
    NSLog(@"found Product!");
    if (!"s:product")
        productScanned = [[NSMutableArray alloc] init];
    return;
}

if ([elementName isEqual:@"s:gtin"]) {
    // set ItemNumber as the GTIN of the productScanned     
    itemNumber = [[NSMutableString alloc] init];
}

if ([elementName isEqual:@"s:title"]) {
    // set ItemDesc as the item description of the productScanned
    itemDesc = [[NSMutableString alloc] init];
}

if ([elementName isEqual:@"s:brand"]) {
    // set ItemBrand as the brand description of the productScanned
    itemBrand = [[NSMutableString alloc] init];
}

if ([elementName isEqual:@"s:name"]) {
    // set ItemStore as the store location of the productScanned
    itemStore = [[NSMutableString alloc] init];
}

// Create array of Image Tags
if ([elementName isEqual:@"s:images"]) {
    NSLog(@"found Images!");
    if (!itemImageURLArray)
        itemImageURLArray = [[NSMutableArray alloc] init];
    return; 

    if ([elementName isEqualToString:@"s:image"]) {
        // itemImagesArray is an NSMutableArray instance variable
        if (!itemImagesArray)
            itemImagesArray = [[NSMutableArray alloc] init];
        NSString *thisLink = [attributeDict objectForKey:@"link"];
        if (thisLink)
            // do something
        return;
    }
}
itemImageURL = [itemImagesArray objectAtIndex:0];
}

Why do my results return all element information except for the <s:images> and <s:image> elements?

Better yet. Help me understand why my array for parsing <s:images> isn't loading those elements into my *itemImageURL pointer?

Upvotes: 0

Views: 1186

Answers (1)

user467105
user467105

Reputation:

I assume itemImageURLArray is supposed to contain the url strings and itemImagesArray the actual images the urls point to.

The s:image elements are never processed because that code is inside the if block for s:images. When didStartElement is called for s:image, that code never runs. Move it outside the if for s:images.

Also, in the code that handles s:image, you probably want to add the url string to the itemImageURLArray array. After the line that sets thisLink, try adding:

[itemImageURLArray addObject:thisLink];

As for downloading the images themselves into itemImagesArray, I would do it as a separate step after the xml parsing. You can loop through the itemImagesArray and download the images asynchronously.


By the way, this line:

if (!"s:product")

should probably be:

if (!productScanned)

Upvotes: 1

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