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iOS How to download app icon from web?

Apple have a JSON web service for retrieving details from store items.

http://www.apple.com/itunes/affilia...tion/itunes-store-web-service-search-api.html

For example if you know the ID, http://itunes.apple.com/lookup?id=408671117 would return a JSON file with the following:

Code: 
{

    "resultCount": 1,
    "results": [
        {
            "kind": "software",
            "features": [
                "iosUniversal"
            ],
            "supportedDevices": [
                "all"
            ],
            "isGameCenterEnabled": false,
            "screenshotUrls": [
                "http://a1.mzstatic.com/us/r1000/063/Purple/v4/cc/6f/8c/cc6f8c3c-72e5-64e3-61ac-ba891a3e4f75/mzl.ksovqfvx.jpg",
                "http://a5.mzstatic.com/us/r1000/097/Purple/v4/fc/e4/ec/fce4ecfc-9071-e5f3-d771-f5ca24dbaf3d/mzl.ujhafrgn.jpg",
                "http://a1.mzstatic.com/us/r1000/111/Purple/v4/39/16/94/391694f1-93c6-a913-6698-e1d80c13d0a2/mzl.juuqoppw.png",
                "http://a5.mzstatic.com/us/r1000/079/Purple/v4/39/82/fa/3982fa24-3439-c1b1-fe2b-c5cf7310948a/mzl.gwnhxdxo.jpg",
                "http://a3.mzstatic.com/us/r1000/070/Purple/v4/e8/03/d9/e803d95e-3e37-0308-c5e0-7a8d347d5781/mzl.pqwhijxz.jpg"
            ],
            "ipadScreenshotUrls": [
                "http://a1.mzstatic.com/us/r1000/073/Purple/v4/12/bb/58/12bb58fe-c2f2-4c5d-e437-fba85322e197/mzl.buzwieku.1024x1024-65.jpg",
                "http://a1.mzstatic.com/us/r1000/060/Purple/v4/d6/30/05/d6300510-253b-d584-b351-93a10977f088/mzl.kcpxdnxv.1024x1024-65.jpg",
                "http://a3.mzstatic.com/us/r1000/064/Purple/v4/ab/23/f8/ab23f898-3eae-3fa9-6548-1758efadc01e/mzl.ktyymoqr.1024x1024-65.jpg",
                "http://a5.mzstatic.com/us/r1000/112/Purple/v4/50/a4/c8/50a4c82e-eda6-6e4c-ab62-e4c3165234d3/mzl.aoepwqfh.1024x1024-65.jpg",
                "http://a2.mzstatic.com/us/r1000/114/Purple/v4/5c/97/01/5c9701cf-a4f1-6c8d-71cb-98d989178cb9/mzl.xjozkigq.1024x1024-65.jpg"
            ],
            "artworkUrl60": "http://a1.mzstatic.com/us/r1000/118/Purple/v4/09/3b/c7/093bc72b-e281-bbb9-0241-09906fb46e02/Icon.png",
            "artworkUrl512": "http://a3.mzstatic.com/us/r1000/074/Purple/v4/2d/08/1c/2d081c12-189b-6756-8752-e6851fda710b/mzl.bvrohbme.png",
            "artistViewUrl": "http://itunes.apple.com/us/artist/zangland.com/id408671120?uo=4",
            "artistId": 408671120,
            "artistName": "zangland.com",
            "price": 0,
            "version": "1.7.1",
            "description": "This application can show recent important market events or schedules.\nAll Events are divided into Japan market or world market.\nAll events can be save to Calendar, send to Twitter and Post to Facebook.",
            "genreIds": [
                "6015",
                "6000"
            ],
            "releaseDate": "2010-12-17T11:55:07Z",
            "sellerName": "Zhengrong Zang",
            "currency": "USD",
            "genres": [
                "Finance",
                "Business"
            ],
            "bundleId": "com.zangland.MarketEvent",
            "trackId": 408671117,
            "trackName": "Market Event",
            "primaryGenreName": "Finance",
            "primaryGenreId": 6015,
            "releaseNotes": "1. Show Event since last month\n2. Ready for iPad Retina\n3. Bug fix",
            "wrapperType": "software",
            "trackCensoredName": "Market Event",
            "languageCodesISO2A": [
                "EN",
                "JA",
                "ZH"
            ],
            "fileSizeBytes": "5843577",
            "sellerUrl": "http://",
            "contentAdvisoryRating": "4+",
            "artworkUrl100": "http://a3.mzstatic.com/us/r1000/074/Purple/v4/2d/08/1c/2d081c12-189b-6756-8752-e6851fda710b/mzl.bvrohbme.png",
            "trackViewUrl": "http://itunes.apple.com/us/app/market-event/id408671117?mt=8&uo=4",
            "trackContentRating": "4+"
        }
    ]

}

Depending on what platform/language you're using, there's probably a JSON framework/API to easily pull what you want from the data
 
bindle said:
Apple have a JSON web service for retrieving details from store items.

http://www.apple.com/itunes/affilia...tion/itunes-store-web-service-search-api.html

For example if you know the ID, http://itunes.apple.com/lookup?id=408671117 would return a JSON file with the following:

Code: 
{

    "resultCount": 1,
    "results": [
        {
            "kind": "software",
            "features": [
                "iosUniversal"
            ],
            "supportedDevices": [
                "all"
            ],
            "isGameCenterEnabled": false,
            "screenshotUrls": [
                "http://a1.mzstatic.com/us/r1000/063/Purple/v4/cc/6f/8c/cc6f8c3c-72e5-64e3-61ac-ba891a3e4f75/mzl.ksovqfvx.jpg",
                "http://a5.mzstatic.com/us/r1000/097/Purple/v4/fc/e4/ec/fce4ecfc-9071-e5f3-d771-f5ca24dbaf3d/mzl.ujhafrgn.jpg",
                "http://a1.mzstatic.com/us/r1000/111/Purple/v4/39/16/94/391694f1-93c6-a913-6698-e1d80c13d0a2/mzl.juuqoppw.png",
                "http://a5.mzstatic.com/us/r1000/079/Purple/v4/39/82/fa/3982fa24-3439-c1b1-fe2b-c5cf7310948a/mzl.gwnhxdxo.jpg",
                "http://a3.mzstatic.com/us/r1000/070/Purple/v4/e8/03/d9/e803d95e-3e37-0308-c5e0-7a8d347d5781/mzl.pqwhijxz.jpg"
            ],
            "ipadScreenshotUrls": [
                "http://a1.mzstatic.com/us/r1000/073/Purple/v4/12/bb/58/12bb58fe-c2f2-4c5d-e437-fba85322e197/mzl.buzwieku.1024x1024-65.jpg",
                "http://a1.mzstatic.com/us/r1000/060/Purple/v4/d6/30/05/d6300510-253b-d584-b351-93a10977f088/mzl.kcpxdnxv.1024x1024-65.jpg",
                "http://a3.mzstatic.com/us/r1000/064/Purple/v4/ab/23/f8/ab23f898-3eae-3fa9-6548-1758efadc01e/mzl.ktyymoqr.1024x1024-65.jpg",
                "http://a5.mzstatic.com/us/r1000/112/Purple/v4/50/a4/c8/50a4c82e-eda6-6e4c-ab62-e4c3165234d3/mzl.aoepwqfh.1024x1024-65.jpg",
                "http://a2.mzstatic.com/us/r1000/114/Purple/v4/5c/97/01/5c9701cf-a4f1-6c8d-71cb-98d989178cb9/mzl.xjozkigq.1024x1024-65.jpg"
            ],
            "artworkUrl60": "http://a1.mzstatic.com/us/r1000/118/Purple/v4/09/3b/c7/093bc72b-e281-bbb9-0241-09906fb46e02/Icon.png",
            "artworkUrl512": "http://a3.mzstatic.com/us/r1000/074/Purple/v4/2d/08/1c/2d081c12-189b-6756-8752-e6851fda710b/mzl.bvrohbme.png",
            "artistViewUrl": "http://itunes.apple.com/us/artist/zangland.com/id408671120?uo=4",
            "artistId": 408671120,
            "artistName": "zangland.com",
            "price": 0,
            "version": "1.7.1",
            "description": "This application can show recent important market events or schedules.\nAll Events are divided into Japan market or world market.\nAll events can be save to Calendar, send to Twitter and Post to Facebook.",
            "genreIds": [
                "6015",
                "6000"
            ],
            "releaseDate": "2010-12-17T11:55:07Z",
            "sellerName": "Zhengrong Zang",
            "currency": "USD",
            "genres": [
                "Finance",
                "Business"
            ],
            "bundleId": "com.zangland.MarketEvent",
            "trackId": 408671117,
            "trackName": "Market Event",
            "primaryGenreName": "Finance",
            "primaryGenreId": 6015,
            "releaseNotes": "1. Show Event since last month\n2. Ready for iPad Retina\n3. Bug fix",
            "wrapperType": "software",
            "trackCensoredName": "Market Event",
            "languageCodesISO2A": [
                "EN",
                "JA",
                "ZH"
            ],
            "fileSizeBytes": "5843577",
            "sellerUrl": "http://",
            "contentAdvisoryRating": "4+",
            "artworkUrl100": "http://a3.mzstatic.com/us/r1000/074/Purple/v4/2d/08/1c/2d081c12-189b-6756-8752-e6851fda710b/mzl.bvrohbme.png",
            "trackViewUrl": "http://itunes.apple.com/us/app/market-event/id408671117?mt=8&uo=4",
            "trackContentRating": "4+"
        }
    ]

}

Depending on what platform/language you're using, there's probably a JSON framework/API to easily pull what you want from the data
Click to expand...
Thank you very much! This is what I need.
 
bindle said:
Apple have a JSON web service for retrieving details from store items.

http://www.apple.com/itunes/affilia...tion/itunes-store-web-service-search-api.html

For example if you know the ID, http://itunes.apple.com/lookup?id=408671117 would return a JSON file with the following:

Code: 
{

    "resultCount": 1,
    "results": [
        {
            "kind": "software",
            "features": [
                "iosUniversal"
            ],
            "supportedDevices": [
                "all"
            ],
            "isGameCenterEnabled": false,
            "screenshotUrls": [
                "http://a1.mzstatic.com/us/r1000/063/Purple/v4/cc/6f/8c/cc6f8c3c-72e5-64e3-61ac-ba891a3e4f75/mzl.ksovqfvx.jpg",
                "http://a5.mzstatic.com/us/r1000/097/Purple/v4/fc/e4/ec/fce4ecfc-9071-e5f3-d771-f5ca24dbaf3d/mzl.ujhafrgn.jpg",
                "http://a1.mzstatic.com/us/r1000/111/Purple/v4/39/16/94/391694f1-93c6-a913-6698-e1d80c13d0a2/mzl.juuqoppw.png",
                "http://a5.mzstatic.com/us/r1000/079/Purple/v4/39/82/fa/3982fa24-3439-c1b1-fe2b-c5cf7310948a/mzl.gwnhxdxo.jpg",
                "http://a3.mzstatic.com/us/r1000/070/Purple/v4/e8/03/d9/e803d95e-3e37-0308-c5e0-7a8d347d5781/mzl.pqwhijxz.jpg"
            ],
            "ipadScreenshotUrls": [
                "http://a1.mzstatic.com/us/r1000/073/Purple/v4/12/bb/58/12bb58fe-c2f2-4c5d-e437-fba85322e197/mzl.buzwieku.1024x1024-65.jpg",
                "http://a1.mzstatic.com/us/r1000/060/Purple/v4/d6/30/05/d6300510-253b-d584-b351-93a10977f088/mzl.kcpxdnxv.1024x1024-65.jpg",
                "http://a3.mzstatic.com/us/r1000/064/Purple/v4/ab/23/f8/ab23f898-3eae-3fa9-6548-1758efadc01e/mzl.ktyymoqr.1024x1024-65.jpg",
                "http://a5.mzstatic.com/us/r1000/112/Purple/v4/50/a4/c8/50a4c82e-eda6-6e4c-ab62-e4c3165234d3/mzl.aoepwqfh.1024x1024-65.jpg",
                "http://a2.mzstatic.com/us/r1000/114/Purple/v4/5c/97/01/5c9701cf-a4f1-6c8d-71cb-98d989178cb9/mzl.xjozkigq.1024x1024-65.jpg"
            ],
            "artworkUrl60": "http://a1.mzstatic.com/us/r1000/118/Purple/v4/09/3b/c7/093bc72b-e281-bbb9-0241-09906fb46e02/Icon.png",
            "artworkUrl512": "http://a3.mzstatic.com/us/r1000/074/Purple/v4/2d/08/1c/2d081c12-189b-6756-8752-e6851fda710b/mzl.bvrohbme.png",
            "artistViewUrl": "http://itunes.apple.com/us/artist/zangland.com/id408671120?uo=4",
            "artistId": 408671120,
            "artistName": "zangland.com",
            "price": 0,
            "version": "1.7.1",
            "description": "This application can show recent important market events or schedules.\nAll Events are divided into Japan market or world market.\nAll events can be save to Calendar, send to Twitter and Post to Facebook.",
            "genreIds": [
                "6015",
                "6000"
            ],
            "releaseDate": "2010-12-17T11:55:07Z",
            "sellerName": "Zhengrong Zang",
            "currency": "USD",
            "genres": [
                "Finance",
                "Business"
            ],
            "bundleId": "com.zangland.MarketEvent",
            "trackId": 408671117,
            "trackName": "Market Event",
            "primaryGenreName": "Finance",
            "primaryGenreId": 6015,
            "releaseNotes": "1. Show Event since last month\n2. Ready for iPad Retina\n3. Bug fix",
            "wrapperType": "software",
            "trackCensoredName": "Market Event",
            "languageCodesISO2A": [
                "EN",
                "JA",
                "ZH"
            ],
            "fileSizeBytes": "5843577",
            "sellerUrl": "http://",
            "contentAdvisoryRating": "4+",
            "artworkUrl100": "http://a3.mzstatic.com/us/r1000/074/Purple/v4/2d/08/1c/2d081c12-189b-6756-8752-e6851fda710b/mzl.bvrohbme.png",
            "trackViewUrl": "http://itunes.apple.com/us/app/market-event/id408671117?mt=8&uo=4",
            "trackContentRating": "4+"
        }
    ]

}

Depending on what platform/language you're using, there's probably a JSON framework/API to easily pull what you want from the data
Click to expand...
Sorry for simple question, now I got search results in NSDictionary, how can I get one of value for a specific key, for example "trackName"?
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
NSDictionary *results = [json objectForKey:mad:"results"];

I am not sure how to get it...
 
mikezang said:
Sorry for simple question, now I got search results in NSDictionary, how can I get one of value for a specific key, for example "trackName"?
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
NSDictionary *results = [json objectForKey:mad:"results"];

I am not sure how to get it...
Click to expand...
You need to understand what your data actually is. Then you can interpret and use it properly.

Look at your JSON text:
Code: 
{
    "resultCount": 1,
    "results": [
        {
            "kind": "software",
Do you see the [ after the "results": ? Do you realize that in JSON [ ] means an array?

Now look at your code:
Code: 
	NSDictionary *results = [json objectForKey:@"results"];
If the JSON object is really an array, is storing that object into an NSDictionary variable going to work?
 
chown33 said:
You need to understand what your data actually is. Then you can interpret and use it properly.

Look at your JSON text:
Code: 
{
    "resultCount": 1,
    "results": [
        {
            "kind": "software",
Do you see the [ after the "results": ? Do you realize that in JSON [ ] means an array?

Now look at your code:
Code: 
	NSDictionary *results = [json objectForKey:@"results"];
If the JSON object is really an array, is storing that object into an NSDictionary variable going to work?
Click to expand...
Thanks for your reply. I just got it as below:
Code: 
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
    NSArray *results = [json objectForKey:@"results"];
    
    NSArray *trackName = [results valueForKey:@"trackName"];
 
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