I have an array with hexadecimal value like below:
const UInt8 request_MifareID[] = {
0x00, 0xCA, 0x01, 0x0A, 0x00
};
then i transfer it to NSData for communication:
NSData *data = [[NSData alloc] initWithBytesNoCopy:(UInt8 *)request_MifareID length:5];
Sent "data" to server and get the server response:
Printing description of resp:
<ee97562d 02280400 00000000 21074400 9000>
NSUInteger len = [resp length];
Printing description of len:
(NSUInteger) len = 18
the "resp" is also a Hexadecimal format NSData
now, i have to transfer the "resp" to Decimal array
how should i do?
------------------------------------------------------Edit
Ok, first
i have to transfer the NSData which server response(it is not String, just numbers):
ee97562d 02280400 00000000 21074400 9000
into what kind of object?
Byte?
when i use
NSString * str = [[NSString alloc] initWithData: resp
encoding:NSUTF8StringEncoding];
it returns nil
int number = 0xe; // or 0x3, 0x6, 0x8, 0x2
NSString * decimalString = [NSString stringWithFormat:#"%d", number];
NSString * hexString = [NSString stringWithFormat:#"%x", number];
**NSData *data = [NSData dataWithBytes:"FF3C" length:4];
NSString *string = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
string = [#"0x" stringByAppendingString:string];
unsigned short value;
sscanf([string UTF8String], "%hx", &value);
NSLog(#"%d", value)**
Related
I have an one hexa decimal number
535443326663315634524877795678586b536854535530342f44526a795744716133353942704359697a6b736e446953677171555473
I want to convert this number to ASCII format which will look like this
STC2fc1V4RHwyVxXkShTSU04/DRjyWDqa359BpCYizksnDiSgqqUTsYUOcHKHNMJOdqR1/TQywpD9a9xhri
i have seen solutions here but none of them is useful to me
NSString containing hex convert to ascii equivalent
i checked here but they give different result. Any help
This works perfectly
- (NSString *)stringFromHexString:(NSString *)hexString {
// The hex codes should all be two characters.
if (([hexString length] % 2) != 0)
return nil;
NSMutableString *string = [NSMutableString string];
for (NSInteger i = 0; i < [hexString length]; i += 2) {
NSString *hex = [hexString substringWithRange:NSMakeRange(i, 2)];
NSInteger decimalValue = 0;
sscanf([hex UTF8String], "%x", &decimalValue);
[string appendFormat:#"%c", decimalValue];
NSLog(#"string--%#",string);
}
_hexString1=string;
NSLog(#"string ---%#",_hexString1);
return string;
}
If you're starting with NSData * you could get the ASCII string this way:
NSData *someData = [NSData dataWithHexString:#"ABC123"];
NSString *asciiString = [[NSString alloc] initWithData: someData encoding:NSASCIIStringEncoding];
I am working on my first iPhone application, in that application I have to calculate the length of NSString, I have tried the available methods and solutions here on SO but for the length is always wrong. For example for a string "test4" NSString.length returns 12 while it should return 5.
I have tried NSString's length property and lengthOfBytesUsingEncoding but both return the same result.
Any help would be appreciated.
EDIT
NSString *string = #"test4";
[string lengthOfBytesUsingEncoding:NSUTF8StringEncoding]; // returns 12
string.length; // returns 12
Complete Code
+(NSString *)AES256Encrypt:(NSString *)data withKey:(NSString *)rawkey{
rawkey = [NSString stringWithFormat:#"%#%#", #"123456789023456", rawkey];
rawkey = [rawkey substringWithRange:NSMakeRange(0, 32)];
NSData *key = [rawkey dataUsingEncoding:NSUTF8StringEncoding];
NSData *iv = [key subdataWithRange:NSMakeRange(0, 16)];
const char *bytes = [data cStringUsingEncoding:NSUTF8StringEncoding];
NSLog(#"%d", data.length); // prints 12
data = [self encode:bytes length:data.length];
NSData *rawData = [data dataUsingEncoding:NSUTF8StringEncoding];
CCCryptorStatus status = kCCSuccess;
NSData *encrypted = [rawData dataEncryptedUsingAlgorithm:kCCAlgorithmAES128 key:key initializationVector:iv options:kCCOptionPKCS7Padding error:&status];
NSString *text = [encrypted base64EncodedString];
return text;
}
Thanks
NSString *myString = #"test4";
int i =myString.length;
NSLog(#"Count =%d",i);
which print Count = 5
I'm using the NSData+compression.h and the Base64Transcoder.h elements to be able to zip and unzip content.
Basically to unzip the server responses.
The unzip method works perfectly
+ (NSString *) unzip: (NSString*) stringValue{
Byte inputData[[stringValue lengthOfBytesUsingEncoding:NSUTF8StringEncoding]];
[[stringValue dataUsingEncoding:NSUTF8StringEncoding] getBytes:inputData];
size_t inputDataSize = (size_t)[stringValue length];
size_t outputDataSize = EstimateBas64DecodedDataSize(inputDataSize);
Byte outputData[outputDataSize];//prepare a Byte[] for the decoded data
Base64DecodeData(inputData, inputDataSize, outputData, &outputDataSize);
NSData *theData = [[NSData alloc] initWithBytes:outputData length:outputDataSize];
//And now we gunzip:
NSData* result = [theData gzipInflate];//make bigger==gunzip
NSString *temp = [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];
return temp;
}
But when I try to zip a content, using the simetric way, the gzipDeflate fails, and return an empty or nil value.
This is my zip code
+ (NSData *) zip:(NSData *) theSourceData {
// And now we zip:
NSData *result = [theSourceData gzipDeflate];
Byte inputData[[result length]];
[result getBytes:inputData];
size_t inputDataSize = (size_t)[result length];
size_t outputDataSize = EstimateBas64DecodedDataSize(inputDataSize);
char outputData[outputDataSize];//prepare a Byte[] for the decoded data
Base64EncodeData(inputData, inputDataSize, outputData, &outputDataSize, NO);
NSData *theData = [[NSData alloc] initWithBytes:outputData length:outputDataSize];
return theData;
}
Any suggestions?
Thanks
The problem was on the Base64 encoder.
+ (NSString *) zip:(NSData *) theSourceData {
// And now we zip:
NSData *result = [theSourceData gzipDeflate];
NSString *source = [NSString base64StringFromData:result length:[result length]];
return source;
}
We've integrated the base64StringFromData:length: method to solve it.
Thanks,
Ivan
I get NSData of bytes that look like this:
2d2d2d2d 2d2d2d2d 2d2d2d2d 2d2d2d2d 2d2d2d2d 2d2d2d2d 2d2d2d2d 2d353731 35343039 37373139
34383437 34303832 30333533 30383232 380d0a43 6f6e7465 6e742d44 6973706f 73697469 6f6e3a20
666f726d 2d646174 613b206e 616d653d 2266696c 65223b20 66696c65 6e616d65
3d224265 61636820 426f7973 202d2047 6f6f6420 56696272 6174696f 6e732e6d
and i want to convert it to NSString, i tried this method but it give me a nil to the string:
NSString* postInfo = [[NSString alloc] initWithBytes:[postDataChunk bytes] length:[postDataChunk length] encoding:NSUTF8StringEncoding];
You can use,
NSString* newStr = [[NSString alloc] initWithData:theData
encoding:NSUTF8StringEncoding];
If the data is null-terminated, you should instead use
NSString* newStr = [NSString stringWithUTF8String:[theData bytes]];
for further reference see these links:
Convert UTF-8 encoded NSData to NSString
NSString class reference
http://homepage.mac.com/mnishikata/objective-c_memo/convert_nsdata_to_nsstring_.html
If you're looking to trace the actual hex values of the NSData object, I use this approach:
uint8_t *bytes = (uint8_t*)myNSDataObject.bytes;
NSMutableString *bytesStr= [NSMutableString stringWithCapacity:sizeof(bytes)*2];
for(int i=0;i<sizeof(bytes);i++){
NSString *resultString =[NSString stringWithFormat:#"%02lx",(unsigned long)bytes[i]];
[bytesStr appendString:resultString];
}
I have some Bytes of image in my string and i want to draw it to UIImageView ...Here is my code
NSString* str= #"<89504e47 0d0a1a0a 0000000d 49484452 ........... 454e44ae 426082>";
NSData* data=[str dataUsingEncoding:NSUTF8StringEncoding];
NSLog(#"My NSDATA %#",data);
imageView.image=[UIImage imageWithData:data];
Now when i saw that printed data on console it is not in same format what i gave to that string..The output is something like.....
<3c383935 30346534 37203064 30613161..........
So my imageview show nothing..... please help
if question was: How to convert string data to image then this is answer.
NSData *imgData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"icon" ofType:#"png"]];
// set your string data into inputString var
NSString *inputString = [imgData description];
NSLog(#"input string %#",inputString);
// clearing string from trashes
NSString *dataStr = [inputString stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:#"<>"]];
// separate by words of 4 bytes
NSArray *words = [dataStr componentsSeparatedByString:#" "];
// calculate number of bytes
NSArray *sizes = [words valueForKey:#"length"];
int sizeOfBytes = 0;
for (NSNumber *size in sizes) {
sizeOfBytes += [size intValue]/2;
}
int bytes[sizeOfBytes];
int counts = 0;
for (NSString *word in words) {
// convert each word from string to int
NSMutableString *ostr = [NSMutableString stringWithCapacity:[word length]];
while ([word length] > 0) {
[ostr appendFormat:#"%#", [word substringFromIndex:[word length] - 2]];
word = [word substringToIndex:[word length] - 2];
}
NSScanner *scaner = [NSScanner scannerWithString:ostr];
unsigned int val;
[scaner scanHexInt:&val];
bytes[counts] = val;
counts++;
}
// get NSData form c array
NSData* data = [NSData dataWithBytes:bytes length:sizeOfBytes];
NSLog(#"My NSDATA %#",data);
// your image is ready
UIImage *image = [UIImage imageWithData:data];
NSLog(#"image: %#",image);
what you are seeing in NSLog output are the ASCII codes of the string characters.
for example:
NSString* str = #"A";
NSData* data=[str dataUsingEncoding:NSUTF8StringEncoding];
NSLog(#"%#",data);
you will see something like:
<41....
that's because 0x41 is the code for letter A.
Same is happening with your string.
The data is exactly what you're feeding it: a simple string (printed as raw byte values). But I guess your input string is a hexdump and you manually need to turn into bytes.