iOS How do I read an image from a byte array in Objective C?

[Knight Rider]

I'm getting a XML containing image which is base64 encoded.I've to decode that & need to display a image.Any suggestions.............

 

[robbieduncan]

Did you read the documentation for UIImage? There is a very obvious constructor...

 

[chingling]

I'm getting a XML containing image which is base64 encoded.I've to decode that & need to display a image.Any suggestions.............

Did you solve this problem with getting image from byte array? If yes can you help me?

Thanks

 

[firewood]

There is base64 decode code for the iPhone available from several blogs. Once you decode and get the raw image, you will need to know exactly what format it's in (compression, size, color depth, etc.)

 

[Knight Rider]

Did you solve this problem with getting image from byte array? If yes can you help me?

Thanks

This may help ya

#import <Foundation/NSString.h>

@interface NSString (NSStringAdditions)

+ (NSString *) base64StringFromDataNSData *)data lengthint)length;

@end

-------------------------------------------

#import "NSStringAdditions.h"

static char base64EncodingTable[64] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
};

@implementation NSString (NSStringAdditions)

+ (NSString *) base64StringFromData: (NSData *)data length: (int)length {
unsigned long ixtext, lentext;
long ctremaining;
unsigned char input[3], output[4];
short i, charsonline = 0, ctcopy;
const unsigned char *raw;
NSMutableString *result;

lentext = [data length];
if (lentext < 1)
return @"";
result = [NSMutableString stringWithCapacity: lentext];
raw = [data bytes];
ixtext = 0;

while (true) {
ctremaining = lentext - ixtext;
if (ctremaining <= 0)
break;
for (i = 0; i < 3; i++) {
unsigned long ix = ixtext + i;
if (ix < lentext)
input = raw[ix];
else
input = 0;
}
put[0] = (input[0] & 0xFC) >> 2;
output[1] = ((input[0] & 0x03) << 4) | ((input[1] & 0xF0) >> 4);
output[2] = ((input[1] & 0x0F) << 2) | ((input[2] & 0xC0) >> 6);
output[3] = input[2] & 0x3F;
ctcopy = 4;
switch (ctremaining) {
case 1:
ctcopy = 2;
break;
case 2:
ctcopy = 3;
break;
}

for (i = 0; i < ctcopy; i++)
[result appendString: [NSString stringWithFormat: @"%c", base64EncodingTable[output]]];

for (i = ctcopy; i < 4; i++)
[result appendString: @"="];

ixtext += 3;
charsonline += 4;

if ((length > 0) && (charsonline >= length))
charsonline = 0;

return result;
}

@end

******For Base64 decoding:*********
#import <Foundation/Foundation.h>

@class NSString;

@interface NSData (NSDataAdditions)

+ (NSData *) base64DataFromStringNSString *)string;

-------------------------------------------

#import "NSDataAdditions.h"

@implementation NSData (NSDataAdditions)

+ (NSData *) base64DataFromString: (NSString *)string {
unsigned long ixtext, lentext;
unsigned char ch, input[4], output[3];
short i, ixinput;
Boolean flignore, flendtext = false;
const char *temporary;
NSMutableData *result;

if (!string)
return [NSData data];

ixtext = 0;
temporary = [string UTF8String];
lentext = [string length];
result = [NSMutableData dataWithCapacity: lentext];
ixinput = 0;
while (true) {
if (ixtext >= lentext)
break;
ch = temporary[ixtext++];
flignore = false;
if ((ch >= 'A') && (ch <= 'Z'))
ch = ch - 'A';
else if ((ch >= 'a') && (ch <= 'z'))
ch = ch - 'a' + 26;
else if ((ch >= '0') && (ch <= '9'))
ch = ch - '0' + 52;
else if (ch == '+')
ch = 62;
else if (ch == '=')
flendtext = true;
else if (ch == '/')
ch = 63;
else
flignore = true;

if (!flignore) {
short ctcharsinput = 3;
Boolean flbreak = false;

if (flendtext) {
if (ixinput == 0)
break;
if ((ixinput == 1) || (ixinput == 2)) {
ctcharsinput = 1;
else
ctcharsinput = 2;

ixinput = 3;
flbreak = true;
}

input[ixinput++] = ch;

if (ixinput == 4)
ixinput = 0;

output[0] = (input[0] << 2) | ((input[1] & 0x30) >> 4);
output[1] = ((input[1] & 0x0F) << 4) | ((input[2] & 0x3C) >> 2);
output[2] = ((input[2] & 0x03) << 6) | (input[3] & 0x3F);

for (i = 0; i < ctcharsinput; i++)
[result appendBytes: &output length: 1];
}

if (flbreak)
break;
}
return result;
}

@end