iOS Development Web Learning 12: nsurlsession Implementing file Uploads

#import "ViewController.h"//----WEBKITFORMBOUNDARYVMI3CAV0SGUTL8TR#defineKboundary @ "----webkitformboundaryjv0ufa04ed44ahwx"#defineknewline [@ "\ r \ n" datausingencoding:nsutf8stringencoding]@interfaceViewcontroller () <NSURLSessionDataDelegate>/** Notes*/@property (nonatomic, strong) Nsurlsession*session;@end@implementationViewcontroller-(Nsurlsession *) session{if(_session = =Nil) {nsurlsessionconfiguration*config =[Nsurlsessionconfiguration defaultsessionconfiguration]; //whether to run cellular accessConfig.allowscellularaccess =YES; Config.timeoutintervalforrequest= the; _session= [Nsurlsession sessionwithconfiguration:configDelegate: Self delegatequeue:[nsoperationqueue mainqueue]]; }    return_session;}-(void) Touchesbegan: (Nsset<uitouch *> *) touches withevent: (Uievent *)Event{[self upload2];}-(void) upload{//1.urlNsurl *url = [Nsurl urlwithstring:@"Http://120.25.226.186:32812/upload"]; //2. Create a Request objectNsmutableurlrequest *request =[Nsmutableurlrequest Requestwithurl:url]; //2.1 Setting the request methodRequest. HttpMethod =@"POST"; //2.2 Setting the request header information[Request Setvalue:[nsstring stringWithFormat:@"multipart/form-data; boundary=%@", Kboundary] Forhttpheaderfield:@"Content-type"]; //3. Creating a Session Object//nsurlsession *session = [Nsurlsession sharedsession]; //4. Create an upload task    /*first parameter: The second parameter of the Request object: Pass is the data to be uploaded (request body) The third parameter:*/Nsurlsessionuploadtask*uploadtask = [self.session uploadtaskwithrequest:request fromdata:[self Getbodydata] completionHandler:^ (NSData * _ Nullable data, Nsurlresponse * _nullable response, Nserror *_nullable Error) {              //6. ParsingNSLog (@"%@", [[NSString Alloc]initwithdata:data encoding:nsutf8stringencoding]);        }]; //5. Execute Task[Uploadtask resume];}-(void) upload2{//1.urlNsurl *url = [Nsurl urlwithstring:@"Http://120.25.226.186:32812/upload"]; //2. Create a Request objectNsmutableurlrequest *request =[Nsmutableurlrequest Requestwithurl:url]; //2.1 Setting the request methodRequest. HttpMethod =@"POST"; //2.2 Setting the request header information[Request Setvalue:[nsstring stringWithFormat:@"multipart/form-data; boundary=%@", Kboundary] Forhttpheaderfield:@"Content-type"]; //3. Creating a Session Object//4. Create an upload task    /*first parameter: Request object Second argument: Delivery is the data to be uploaded (request body)*/Nsurlsessionuploadtask*uploadtask = [self.session uploadtaskwithrequest:request fromdata:[self Getbodydata] completionHandler:^ (NSData * _ Nullable data, Nsurlresponse * _nullable response, Nserror *_nullable Error) {                //6. ParsingNSLog (@"%@", [[NSString Alloc]initwithdata:data encoding:nsutf8stringencoding]);        }]; //5. Execute Task[Uploadtask resume];}-(NSData *) getbodydata{Nsmutabledata*filedata =[Nsmutabledata data]; //5.1 File Parameters    /*--delimiter content-disposition:form-data; name= "file"; filename= "Snip20160225_341.png" content-type:image/pn G (MIMEType: Large type/small type) blank line file parameters*/[FileData appenddata:[[nsstring stringWithFormat:@"--%@", Kboundary] datausingencoding:nsutf8stringencoding]];        [FileData Appenddata:knewline]; //name:file Server-specified parameters//the name of the Filename:Snip20160225_341.png file saved to the server//content-type: type of File[FileData appenddata:[@"content-disposition:form-data; name=\"File\"; filename=\ "sss.png\""Datausingencoding:nsutf8stringencoding]];    [FileData Appenddata:knewline]; [FileData appenddata:[@"Content-type:image/png"Datausingencoding:nsutf8stringencoding]];    [FileData Appenddata:knewline];        [FileData Appenddata:knewline]; UIImage*image = [UIImage imagenamed:@"snip20160226_90"]; //UIImage--->nsdataNSData *imagedata =uiimagepngrepresentation (image);    [FileData Appenddata:imagedata];        [FileData Appenddata:knewline]; //5.2 Non-file parameters    /*--delimiter content-disposition:form-data; name= "username" Blank line 123456*/[FileData appenddata:[[nsstring stringWithFormat:@"--%@", Kboundary] datausingencoding:nsutf8stringencoding]];    [FileData Appenddata:knewline]; [FileData appenddata:[@"content-disposition:form-data; name=\"Username\""Datausingencoding:nsutf8stringencoding]];    [FileData Appenddata:knewline];    [FileData Appenddata:knewline]; [FileData appenddata:[@"123456"Datausingencoding:nsutf8stringencoding]];        [FileData Appenddata:knewline]; //5.3 End Identification    /*-- delimiter--*/[FileData appenddata:[[nsstring stringWithFormat:@"--%@--", Kboundary] datausingencoding:nsutf8stringencoding]]; returnFileData;}#pragmaMark----------------------#pragmaMark Nsurlsessiondatadelegate/** @param bytessent The data sent this time * @param the size of totalbytessent upload completed * @param Totalbytesexpectedt Total size of osend file*/-(void) Urlsession: (Nsurlsession *) session Task: (Nsurlsessiontask *) Task Didsendbodydata: (int64_t) bytessent totalbytessent: (int64_t) totalbytessent totalbytesexpectedtosend: ( int64_t) totalbytesexpectedtosend{NSLog (@"%f",1.0*totalbytessent/totalbytesexpectedtosend);}@end

# # # # # #7 nsurlsession implementation File upload

(1) How to implement file upload

"' OBJC

/*

First parameter: Request object

Second parameter: request body (file data to upload)

Block callback:

NSData: Response body

Nsurlresponse: Response Header

Nserror: The requested error message

*/

Nsurlsessionuploadtask *uploadtask = [Session uploadtaskwithrequest:request fromdata:data completionHandler:^ (NSData * __nullable data, Nsurlresponse * __nullable response, Nserror * __nullable error)

```

(2) Set up Agent to listen for file upload progress in Agent method

"' OBJC

/*

Call this method to upload file data

If the file data is large, then the method is called multiple times

Parameter description:

Totalbytessent: The size of the file data that has been uploaded

Totalbytesexpectedtosend: Total size of file

*/

-(void) Urlsession: (nonnull nsurlsession *) session task: (nonnull nsurlsessiontask *) Task Didsendbodydata: (int64_t) BytesSent totalbytessent: (int64_t) totalbytessent totalbytesexpectedtosend: (int64_t) TotalBytesExpectedToSend

{

NSLog (@ "%.2f", 1.0 * totalbytessent/totalbytesexpectedtosend);

}

```

(3) About nsurlsessionconfiguration related

01 functions: Nsurlsession can be configured uniformly, such as request timeout, etc.

02 Ways to create and use

"' OBJC

Three ways to create a configuration

+ (nsurlsessionconfiguration *) defaultsessionconfiguration;

+ (nsurlsessionconfiguration *) ephemeralsessionconfiguration;

+ (Nsurlsessionconfiguration *) Backgroundsessionconfigurationwithidentifier: (NSString *) identifier NS_AVAILABLE (10 _10, 8_0);

Unified Configuration Nsurlsession

-(Nsurlsession *) session

{

if (_session = = nil) {

Create Nsurlsessionconfiguration

Nsurlsessionconfiguration *config = [Nsurlsessionconfiguration defaultsessionconfiguration];

Set request Timeout to 10 seconds

Config.timeoutintervalforrequest = 10;

Whether to continue the request (upload or download) in the case of a cellular network

config.allowscellularaccess = NO;

_session = [nsurlsession sessionwithconfiguration:config delegate:self delegatequeue:[nsoperationqueue MainQueue]];

}

return _session;

}

```

iOS Development Web Learning 12: nsurlsession Implementing file Uploads