Web Service(Chapter 28 of Cocoa Programming for Mac OS X)

最新推荐文章于 2025-08-23 15:05:11 发布

转载最新推荐文章于 2025-08-23 15:05:11 发布 · 73 阅读

0 ·

CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/zhtf2014/archive/2011/03/22/1991452.html

文章标签：

#操作系统

本文介绍了一个使用Objective-C编写的AppController类，该类通过Amazon Web Services API进行图书搜索。代码展示了初始化过程、图书搜索功能的实现，包括URL构造、网络请求、XML解析及错误处理。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

1 #import "AppController.h"
2 #define AWS_ID @"1CKE6MZ6S27EFQ458402"
3
4 @implementation AppController
5
6 - (id)init
7 {
8     self = [super init];
9     if (self) {
10         // Initialization code here.
11     }
12
13     return self;
14 }
15
16 - (IBAction)fetchBooks:(id)sender
17 {
18     [progress startAnimation:nil];
19
20     NSString *input = [searchField stringValue];
21     NSString *searchString = [input stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
22     NSLog(@"searchString = %@", searchString);
23
24     NSString *urlString = [NSString stringWithFormat:
25                                                     @"http://ecs.amazonaws.com/onca/xml?"
26                                                     @"Service=AWSECommerceService&"
27                                                     @"AWSAcccessKeyID=%@&"
28                                                     @"Operation=ItemSearch&"
29                                                     @"SearchIndex=Books&"
30                                                     @"Keywords=%@&"
31                                                     @"Version=20007-07-16", AWS_ID, searchString];
32     NSURL *url = [NSURL URLWithString:urlString];
33     NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:30];
34
35     NSData *urlData;
36     NSURLResponse *response;
37     NSError *error;
38     urlData = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&response error:&error];
39
40     if(!urlData)
41     {
42         NSAlert *alert = [NSAlert alertWithError:error];
43         [alert runModal];
44         return;
45     }
46
47     [doc release];
48     doc = [[NSXMLDocument alloc] initWithData:urlData options:0 error:&error];
49     NSLog(@"doc = %@", doc);
50     if (!doc)
51     {
52         NSAlert *alert = [NSAlert alertWithError:error];
53         [alert runModal];
54         return;
55     }
56
57     [itemNodes release];
58     itemNodes = [[doc nodesForXPath:@"ItemSearchResponse/Items/Item" error:&error] retain];
59     if (!itemNodes)
60     {
61         NSAlert *alert = [NSAlert alertWithError:error];
62         [alert runModal];
63         return;
64     }
65
66     [tableView reloadData];
67     [progress stopAnimation:nil];
68 }
69
70 - (int)numberOfRowsInTableView:(NSTableView*)tv
71 {
72     return 0;
73 }
74
75 - (void)dealloc
76 {
77     [super dealloc];
78 }
79
80 @end

转载于:https://www.cnblogs.com/zhtf2014/archive/2011/03/22/1991452.html