Nsdata,nsimage,nsdictionary,nsstring,nsinteger,float,nsurl and so on convert each other

Nsdata,nsimage,nsdictionary,nsstring,nsinteger,float,nsurl and so on convert each other

One: NSString and Nsurl Conversion

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1. Nsstring->nsurl
2. NSString *urlstring=[@ "http://www.google.com" stringbyaddingpercentescapesusingencoding:nsutf8stringencoding];
3. Nsurl *url=[nsurl urlwithstring:urlstring];
4. Nsurl->nsstring
5. NSString *urlstring=[[url absolutestring] stringbyreplacingpercentescapesusingencoding:nsutf8stringencoding];

Two: NSString and NSData conversions (JSON strings can be converted to each other)

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1. Nsdata-> NSString
2. NSString *teststring = [[NSString alloc] Initwithdata:testdata encoding:nsutf8stringencoding];
3. Nsstring->nsdata
4. NSString *astring = @ "I am nsstring";
5. NSData *testdata = [teststring datausingencoding:nsutf8stringencoding];

Three: NSData and Nsimage conversion

[CPP]View Plaincopyprint?< param name= "wmode" value= "Transparent" >

1. Nsdata->uiimage
2. UIImage *testimage = [UIImage imagewithdata:imagedata];
3. Uiimage->nsdata
4. NSData *imagedata = uiimagepngrepresentation (testimage)
5. Or
6. NSData *imagedata = uiimagejpegrepresentation (testimage,1.0)

IV: NSData and Nsdictionary conversion

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2. Nsdata-->nsdictionary
4. Nsdictionary *testdict = [Nsjsonserialization jsonobjectwithdata:testdata options:nsjsonreadingmutablecontainers Error:nil]
6. Or
8. Nskeyedunarchiver *unarchiver = [[Nskeyedunarchiver alloc] initforreadingwithdata:testdata];
10. Nsdictionary *mydictionary = [[Unarchiver decodeobjectforkey:@ "Some Key Value"] retain];
12. [Unarchiver finishdecoding];
14. Nsdictionay-NSData
16. Nsmutabledata *data = [[Nsmutabledata alloc] init];
18. Nskeyedarchiver *archiver = [[Nskeyedarchiver alloc] initforwritingwithmutabledata:data];
20. [Archiver encodeobject:params forkey:@ "Some Key Value"];
22. [Archiver finishencoding];

V: nsdictionary and JSON conversion

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1. Nsdictionary-JSON://This method is in the Sbjson class library, you need to import SBJson.h
2. NSString *jsonstr=[dict Jsonrepresentation];
3. Recommendations (especially HTTP retrieval of the JSONSTR conversions below)
4. Json->nsdictionary:
5. NSData *jsondata = [Testjsonstr datausingencoding:nsutf8stringencoding];
6. Nsdictionary *dict = [nsjsonserialization jsonobjectwithdata:jsondata options:nsjsonreadingmutablecontainers Error: Nil

Excerpt from another student's

NSData with byte
nsdata-> byte array
nsstring *teststring = @ "1234567890";
NSData *testdata = [teststring datausingencoding:nsutf8stringencoding];
Byte *testbyte = (BYTE *) [testData bytes];
for (int i=0;i<[testdata length];i++)
printf ("Testbyte =%d\n", testbyte[i]);

byte array, NSData
byte byte[] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23};
NSData *adata = [[NSData alloc] Initwithbytes:byte length:24];

byte array->16 binary
byte *bytes = (BYTE *) [aData bytes];
NSString *[email protected] "";
for (int i=0;i<[encrydata length];i++)
{
NSString *newhexstr = [NSString stringwithformat:@ "%x", Bytes[i] &0xff]; 16 Binary number
if ([Newhexstr length]==1)
Hexstr = [NSString stringwithformat:@ "%@0%@", hexstr,newhexstr];
else
Hexstr = [NSString stringwithformat:@ "%@%@", Hexstr,newhexstr];
}
NSLog (@ "bytes 16 binary number is:%@", hexstr);

Nsdata,nsimage,nsdictionary,nsstring,nsinteger,float,nsurl and so on convert each other