unarchiver

IOS-archive and Archiver, UnArchiver, and ios-unarchiver 1. Existing archive and archive First, let's look at a simple example: // Method 1: Archive object // object --> file NSArray * array = [NSArray arrayWithObjects: @ "zhang", @ "wangwu", @ "lisi", nil]; // NSHomeDirectory get the root directory stringByAppendingPathComponent Add the stored file name NSString * filePath = [NSHomeDirectory () stringByApp

is saved in the data object Nskeyedarchiver *archiver = [[Nskeyedarchiver alloc]initforwritingwithmutabledata:data]; Archive the object and set key to read [Archiver encodeint:myint forkey:@ "int"]; [Archiver encodeobject:mystring forkey:@ "string"]; [Archiver encodeobject:mynumber forkey:@ "number"]; [Archiver encodeobject:myarray forkey:@ "Array"]; [Archiver encodeobject:mydic forkey:@ "dictionary"]; End Archive [Archiver finishencoding]; Write file [Data writetofile:filename2 Atomically:y

Atomically:yes]; Access: Gets the data from the path construct Nskeyedunarchiver instance, using the Decodexxxforkey method to get the object in the file. Nsmutabledata *datar = [[Nsmutabledata Alloc]initwithcontentsoffile:multihomepath]; Nskeyedunarchiver *unarchiver = [[Nskeyedunarchiver alloc]initforreadingwithdata:dater]; Cgpoint pointr = [unarchiver decodecgpointforkey:@"Kpoint"];

you can use the Decodeobject:forkey method to decode the instance variable3.2 How to use1> Custom entity Classes @interface cycontact:nsobject /** name * /@property (nonatomic,copy) nsstring *name; /** Telephone * /@property (nonatomic,copy) nsstring *phone; @end2> implementation of Nscoding protocol method #pragma mark-nscoding protocol method/* Encodes the receiverusing a given archiver via a given AR The chiver encodes the message receiver. The class terminal Encodewithcoder

(@ "%@", issuccess @ "person writes successfully": @ "person writes failed");Two. Anti-archivingThe reading of a complex object is called an anti-archiveNskeyedunarchiver Anti-archiving tool1. Get the data in the file, a. File path B. Find a data object to receive read resultsNSData *undata = [NSData Datawithcontentsoffile:personpath];2. Creating an anti-archiving toolNskeyedunarchiver *unarchiver = [[Nskeyedunarchiver alloc]initforreadingwithdata:un

compression tool [achiver finishEncoding]; NSString * homePath = NSHomeDirecto Ry (); NSString * toPath = [homePath stringByAppendingPathComponent: @ "person.txt"]; BOOL isSuccess = [data writeToFile: toPath atomically: YES]; NSLog (@ "% @", isSuccess? @ "Successful": @ "failed"); // read complex objects, reverse archiving // NSKeyedUnarchiver NSData * getData = [NSData dataWithContentsOfFile: toPath]; optional * unArchiver = [[NSKeyedUnarchiver allo

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data];// ArchiveNskeyedarchiver *archiver = [[Nskeyedarchiver alloc] initforwritingwithmutabledata:data];int aInt = 100; nsstring *astring = @ "I am an Apple";Nsdictionary *adict = @{@ "a": @ "B", @ "C": @ "D"};[Archiver encodeobject:@ (aInt) forkey:@ "AInt"];[Archiver encodeobject: astring forkey:@ "astring"];[Archiver encodeobject: adict forkey:@ "Adict"];[Archiver finishencoding];NSString *datahomepath = [Nshomedirectory () stringbyappendingpathcomponent:@ "Data.archiver"];[Data writetofile:

Archiving and recovery archivingArchive, English archiver[' ɑrk?v?], this refers to storing OC objects as a file or a block of data on the network.Recovery archive, English unarchiver, refers to restoring an archived block of data from a file or network to an OC object in memory.Archiving and recovery is primarily used to store custom type objects, save custom data before a program is paused or closed, and read stored custom data after the program res

:@"num"]; [Archiver encodeobject:@"LJF"forkey:@"Name"];//Complete the encoding to populate the above archived data into data, where the archived objects are already stored[Archiver finishencoding];NSString*filepath = [Nshomedirectory () stringbyappendingpathcomponent:@"Array. LJF "];BOOLSuccess = [Data Writetofile:filepath atomically:YES];if(success) {NSLog(@"Archive Success"); }}//Solution 2-(void) nskeyedunarchivertwo{NSString*filepath = [Nshomedirectory () stringbyappendingpathcomponent:@"Arr

"];[Archvier finishencoding];[Data Writetofile:multihomepath Atomically:yes];Get data from a fileNsmutabledata *datar = [[Nsmutabledata Alloc]manypath];Nskeyedunarchiver *unarchiver = [[Nskeyedunarchiver Alloc]initforreadingwithdata:datar];Cgpoint pointr = [Unarchiver decodecgpointforkey:@ "Kpoint"];NSString *infor = [Unarchiver decodeobjectforkey:@ "Kinfo"];Nsin

: NSData * contentData = [NSData dataWithContentsOfFile: personPath]; // 1. create an archive tool NSKeyedUnarchiver * unArchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData: contentData]; // 2. read the file (archive method is required) Person * p2 = [unArchiver decodeObjectForKey: @ boyFriend]; NSLog (@%@, p2); // 3. stop [unArchiver finishDecoding]; //

called) [archiver finishEncoding]; // write the archived data to the file [data writeToFile: path atomically: YES]; NSData - Restore from the same file 2 Items Person Object Restore (Decoding) // read data from the file NSData * data = [NSData dataWithContentsOfFile: path]; // based on data, resolved to an authorization object NSKeyedUnarchiver * unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData: data]; Person * person1 = [

-------------------- * // load the file data into the NSData object NSData * data2 = [NSData dataWithContentsOfFile: filepath]; // use the NSData object to initialize the NSKeyedUnarchiver * unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData: data2]; // NSArray * arr2 = [unarchiver decodeObjectForKey: @ "arr"]; NSInteger integer2 = [unarchiver decode

(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ NSMutableData *data = [NSMutableData data]; NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data]; NSArray *keyArray = [NSArray arrayWithArray:[dic allKeys]]; [archiver encodeObject:keyArray forKey:filename]; for (NSString *key in keyArray) { NSObject *object = [dic objectForKey:key]; [archiver encodeObject:object forKey:key]; }

operated.This section is not described in the book. It is estimated that the primary part is skipped.Tmp: The application temporarily stores files. When this is not required, the application deletes the file data under it.This file also provides the directory retrieval method: JavaCode 14 .} 16. # pragma NSCopying protocol implementation 17.-(id) copyWithZone :( NSZone *) zone 18 .{ 23 .} 24. @ end Then, read and write the object archive.[Cpp] view plaincopy// Read the archive fileNSData * data

Withkey: (NSString *) key{Nsmutabledata*data =[[Nsmutabledata alloc] init]; //Create an archive helper classNskeyedarchiver *archiver =[[Nskeyedarchiver alloc] initforwritingwithmutabledata:data]; //Coding[Archiver Encodeobject:model Forkey:key]; //End Encoding[Archiver finishencoding]; //Write if([Data writetofile:[self GetFilePath] atomically:yes]) {NSLog (@"Cache Set Success"); }Else{NSLog (@"Cache Set Fail"); } }//Unarchiver-(ID) Uncode

Datawithcontentsoffile:personpath];Create an anti-archiving toolNskeyedunarchiver *unarchiver=[[nskeyedunarchiver Alloc]initforreadingwithdata:undata];For anti-archivingPerson *p1=[unarchiver Decodeobjectforkey:kperson1];Person *p2=[unarchiver Decodeobjectforkey:kperson2];End Anti-archive[Unarchiver finishdecoding];NS

forkey:@ "Person1"]; [Archiver encodeobject:person2 forkey:@ "Person2"]; Archive complete (make sure to call this method) [Archiver finishencoding]; Writes archived data to the file [data Writetofile:path Atomically:yes]; Recovery (decoding): Reading data from a file nsdata *data = [NSData Datawithcontentsoffile:path]; According to the data, parse into a Nskeyedunarchiver object nskeyedunarchiver *unarchiver = [[Nskeyedunarchiver alloc]

:@ "student.archiver"]; nsdata* data = [NSData datawithcontentsoffile:filename]; if ([data length] > 0) { nskeyedunarchiver* unarchiver = [[Nskeyedunarchiver alloc]initforreadingwithdata:data]; student* Student = [Unarchiver decodeobjectforkey:@ "Mystudent"]; Studentno.text = Student.studentno; Studentname.text = Student.studentname; Studentclass.text = Student.stude