IOS study notes 5-asihttprequest

The usage of asihttprequest is not described much. There are a bunch of instances on the Internet.

1 #import <UIKit/UIKit.h>
2 #import "MainView.h"
3 
4 @interface AppDelegate : UIResponder <UIApplicationDelegate>
5 
6 @property (strong, nonatomic) UIWindow *window;
7 @property (strong, retain) MainView *viewController;
8 
9 @end

 1 - (void)dealloc
 2 {
 3     [_window release];
 4     [_viewController release];
 5     [super dealloc];
 6 }
 7 
 8 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 9 {
10     CGRect screenBounds=[[UIScreen mainScreen]applicationFrame];
11     CGRect windowBounds=screenBounds;
12     windowBounds.origin.y=0;
13     self.window = [[[UIWindow alloc] initWithFrame:screenBounds] autorelease];
14     // Override point for customization after application launch.
15     self.viewController=[[MainView alloc]initWithFrame:windowBounds];
16     self.window.backgroundColor = [UIColor whiteColor];
17     [self.window addSubview: self.viewController];
18     [self.window makeKeyAndVisible];
19     return YES;
20 }

 1 #import <UIKit/UIKit.h>
 2 #import "ASIHTTPRequest.h"
 3 
 4 @interface MainView : UIView
 5 {
 6     UIButton *btn1;
 7     NSOperationQueue *queue;
 8     ASIHTTPRequest *request;
 9     UIProgressView *progressView;
10 }
11 
12 - (IBAction)grabURL:(id)sender;
13 
14 @end

1 # import "mainview. H"
2
3 @ implementation mainview
4
5-(ID) initwithframe :( cgrect) Frame
6 {
7 Self = [Super initwithframe: frame];
8 If (Self ){
9 // queue
10 queue = [[nsoperationqueue alloc] init];
11
12 btn1 = [uibutton buttonwithtype: uibuttontyperoundedrect];
13 [btn1 setframe: cgrectmake (50, 50,100, 50)];
14 [btn1 settitle: @ "Download" forstate: uicontrolstatenormal];
15
16 btn1.titlelabel. font = [uifont boldsystemfontofsize: 14];
17 btn1.titleedgeinsets = uiedgeinsetsmake (0, 0, 0, 16 );
18 [btn1 addtarget: Self
19 action: @ selector (graburlinthebackground :)
20 forcontrolevents: uicontroleventtouchupinside];
21 // progress bar
22 progressview = [[uiprogressview alloc] initwithframe: cgrectmake (0.0f, 40366f, 220366f, 90.0f)];
23 [progressview setprogressviewstyle: uiprogressviewstyledefault];
24
25 [self addsubview: btn1];
26 [self addsubview: progressview];
27}
28 return self;
29}
30
31-(void) dealloc
32 {
33 [Request cleardelegatesandcancel];
34 [request release];
35 request = nil;
36 [progressview release];
37 [queue release];
38 [btn1 release];
39 [Super dealloc];
40}
41
42 // multithreading asynchronous
43-(ibaction) graburlinthebackground :( ID) sender
44 {
45
46 nsurl * url = [nsurl urlwithstring: @ "http://allseeing-i.com"];
47 request = [asihttprequest requestwithurl: url];
48 [Request setdelegate: Self];
49 [Request setdidfinishselector: @ selector (requestdone :)];
50 [Request setdidfailselector: @ selector (requestwentwrong :)];
51 [Request setdownloadprogressdelegate: progressview];
52 [queue addoperation: request];
53
54}
55
56-(void) requestdone :( asihttprequest *) Request
57 {
58 nsstring * responsestring = [Request responsestring];
59 nslog (@ "responsestring = % @", responsestring );
60}
61
62-(void) requestwentwrong :( asihttprequest *) Request
63 {
64 nserror * error = [Request Error];
65}
66
67 // asynchronous
68-(ibaction) graburlinbackground :( ID) sender
69 {
70
71 nsurl * url = [nsurl urlwithstring: @ "http://allseeing-i.com"];
72
73 request = [asihttprequest requestwithurl: url];
74
75 [Request setdelegate: Self];
76
77 [Request startasynchronous];
78
79}
80
81-(void) requestfinished :( asihttprequest *) Request
82 {
83 // This method is used when the returned content is read as text
84 nsstring * responsestring = [Request responsestring];
85
86 // This method is used when the returned content is read in binary format
87 nsdata * responsedata = [Request responsedata];
88
89 nslog (@ "responsestring = % @", responsestring );
90
91 [responsestring autorelease];
92 [responsedata autorelease];
93
94
95}
96
97-(void) requestfailed :( asihttprequest *) Request
98 {
99
100 nserror * error = [Request Error];
101 [error autorelease];
102
103}
104
105 // Synchronization
106-(ibaction) graburl :( ID) sender
107 {
108 nsurl * url = [nsurl urlwithstring: @ "http://allseeing-i.com"];
109
110 request = [asihttprequest requestwithurl: url];
111
112 [Request startsynchronous];
113
114 nserror * error = [Request Error];
115
116 If (! Error ){
117
118 nsstring * response = [Request responsestring];
119 nslog (@ "response = % @", response );
120
121}
122
123}
124
125 @ end