iOS growth path-asihttprequest breakpoint Continuation

1. Import asihttprequest third-party class libraries

: ASIHTTPRequest class Library full code download: download

2. In the. h file

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1. #import <UIKit/UIKit.h>
2. #import "ASIHTTPRequest.h"
3. #import "ASINetworkQueue.h"
4. @interface downloadviewcontroller:uiviewcontroller<asihttprequestdelegate>
5. {
6. Uiprogressview *_progressview;
7. }
9. @property (nonatomic, retain) Uiprogressview *progressview;
10. @property (nonatomic, retain) Asinetworkqueue *asiqueue;
11. @property (nonatomic, retain) asihttprequest *asihttprequest;
12. @end

3. Implement this process in a. m file

Start the queue first:

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1. _asiqueue=[[asinetworkqueue Alloc]init]; //Open Queue
2. [_asiqueue Reset]; //nil
3. _asiqueue.showaccurateprogress=yes; //Progress
4. [_asiqueue go];

To implement the download:

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2. Nsurl *url = [Nsurl urlwithstring:@"request Address"];
6. _asihttprequest=[asihttprequest Requestwithurl:url];
8. _asihttprequest.delegate=self;
10. _asihttprequest.downloadprogressdelegate=self; //Download Progress agent for breakpoint continuation
16. Path = Nshomedirectory (); //This method gets the path to the application directory
20. //destination path, set a destination path for storing downloaded files
22. NSString *savepath = [path stringbyappendingpathcomponent:@"Qgw.mp3"];
24. /* 
26. Temporary path:
28. 1. Set a temporary path to store files during the download process
30. 2. The file will be copied to the destination path when it is loaded and the files in the temporary path are deleted.
32. 3. Continuation of the breakpoint: when the setting of the continuation of the property is yes, each execution will go to the temporary path to find the file to be downloaded, download the progress and so on ... Then it will continue to download, so as to achieve the effect of continued transmission
34. Setting a temporary path is quite important in this process ...
36. */
38. NSString *temp = [path stringbyappendingpathcomponent:@"temp"];
42. /* 
44. Also in the temporary path to add a MP3 format file, which is equivalent to set up a fake to download the file, actually does not exist, it can be understood that: here is a container, the content of the download is populated in this container.
46. This container must be set, otherwise it will not know what to download inside ...
50. Someone will say: ask what does not and the above temporary path together, is not the same: nsstring *temp = [path stringbyappendingpathcomponent:@ "Temp/qgw.mp3"];
52. This is not possible, because your temporary path must be guaranteed to be correct, is owned, so in the following you have to use Nsfilemanager to determine if there is a path, if not exist to create,
54. When you create the time will be Qgw.mp3 as a folder to create, so every time the breakpoint continued to go into the Qgw.mp3 folder to find, of course, is not found (because Qwg.mp3 is)
56. So, to separate to write ...
60. */
62. NSString *temppath = [temp stringbyappendingpathcomponent:@"Qgw.mp3"];
66. //Create File Manager
68. Nsfilemanager *filemanager = [Nsfilemanager Defaultmanager];
70. //Determine if the Temp folder exists
72. BOOL fileexists = [FileManager fileexistsatpath:temp];
74. if (!fileexists)
76. {//created if not present, because the folder is not automatically created when downloading
80. [FileManager Createdirectoryatpath:temp
82. Withintermediatedirectories:yes
84. Attributes:nil
86. Error:nil];
88. }
92. [_asihttprequest Setdownloaddestinationpath:savepath]; //download Path
94. [_asihttprequest Settemporaryfiledownloadpath:temppath];  //temporary path, be sure to set the temporary path:
98. _asihttprequest.allowresumeforfiledownloads = YES; //Open breakpoint, whether to resume the breakpoint
102. //progress bar
104. _progressview.alpha = 1.0f;
106. _progressview.progress=0; //Assigned value is 0
110. [_asiqueue Addoperation:_asihttprequest]; //Join queue

Get the download progress:

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1. Agent method, get download progress
2. -(void) setprogress: (float) newprogress{
3. [_progressview setprogress:newprogress]; //Assign to progress bar
4. }

To stop the download:

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1. [_asihttprequest Cleardelegatesandcancel]; //Shut down

iOS growth path-asihttprequest breakpoint Continuation