Not able to show image in ios - ios

Question

I am getting an json from server in ios which returns one of the value as datatype byte[], I am receiving like
NSData *imageData =[receivedData objectForKey:#"img1"];
if I print this in iOS using NSLog it shows something like below :
(
"-1",
"-40",
"-1",
"-32",
0,
16,
74,
70,
73,
70,
0,
1,
2,
1,
0,
72,
0,
72,
0,
0,
"-1",
"-31",
20,
"-79",
69,
120,
105,
102,
0,
0,
77,
77,
0,
42,
0,
0,
0,
8,
0,
7,
1,
18,
0,
3,
0,
0,
0,
1,
0,
1,
0,
0,
1,
26,
0,
5,
0,
0,
0,
1,
0,
0,
0,
98,
1,
27,
0,
5,
....)
As showing some of the values is showing with double quotes is that the issue? As this is working fine at web application , just need to show this array as image in iOS ?I have to show the image in iOS using the byte array coming from server.
Can anybody point the issue I am new to iOS ..?

Answer 1

Try this.
NSArray *byteArrayReceived = [receivedData objectForKey:#"img1"];
unsigned c = byteArrayReceived.count;
uint8_t *bytes = malloc(sizeof(*bytes) * c);
unsigned i;
for (i = 0; i < c; i++)
{
NSString *str = [byteArrayReceived objectAtIndex:i];
int byte = [str intValue];
bytes[i] = (uint8_t)byte;
}
NSData *data = [NSData dataWithBytes:bytes length:c];
UIImage *image = [UIImage imageWithData:data];

Answer 2

Add this code:
NSArray *array = [receivedData objectForKey:#"img1"];
unsigned c = array.count;
uint8_t *bytes = malloc(sizeof(*bytes) * c);
unsigned i;
for (i = 0; i < c; i++)
{
NSString *str = [array objectAtIndex:i];
int byte = [str intValue];
bytes[i] = byte;
}
NSData *imageData =[NSData dataWithBytesNoCopy:bytes length:c freeWhenDone:YES];// your imageData
UIImage *img=[UIImage imageWithData:data]; // your image
[yourImageView setImage:img];// set to imageView

Answer 3

First you need to convert image data into Base64String.
Make a category of NSData and write code for converting string to base 64
#define BINARY_UNIT_SIZE 3
#define BASE64_UNIT_SIZE 4
void *Base64Decode(
const char *inputBuffer,
size_t length,
size_t *outputLength)
{
if (length == -1)
{
length = strlen(inputBuffer);
}
size_t outputBufferSize = ((length+BASE64_UNIT_SIZE-1) / BASE64_UNIT_SIZE) * BINARY_UNIT_SIZE;unsigned char *outputBuffer = (unsigned char*)malloc(outputBufferSize);
size_t i = 0;
size_t j = 0;
while (i < length)
{
unsigned char accumulated[BASE64_UNIT_SIZE];
size_t accumulateIndex = 0;
while (i < length)
{
unsigned char decode = base64DecodeLookup[inputBuffer[i++]];
if (decode != xx)
{
accumulated[accumulateIndex] = decode;
accumulateIndex++;
if (accumulateIndex == BASE64_UNIT_SIZE)
{
break;
}
}
}
if(accumulateIndex >= 2)
outputBuffer[j] = (accumulated[0] << 2) | (accumulated[1] >> 4);
if(accumulateIndex >= 3)
outputBuffer[j + 1] = (accumulated[1] << 4) | (accumulated[2] >> 2);
if(accumulateIndex >= 4)
outputBuffer[j + 2] = (accumulated[2] << 6) | accumulated[3];
j += accumulateIndex - 1;
}
if (outputLength)
{
*outputLength = j;
}
return outputBuffer;
}
// Convert string to base64String
+ (NSData *)dataFromBase64String:(NSString *)aString
{
NSData *data = [aString dataUsingEncoding:NSASCIIStringEncoding];
size_t outputLength;
void *outputBuffer = Base64Decode([data bytes], [data length], &outputLength);
NSData *result = [NSData dataWithBytes:outputBuffer length:outputLength];
free(outputBuffer);
return result;
}
// now write this code and convert nsdata to image
NSData* data = [NSData dataFromBase64String:[receivedData objectForKey:#"img1"];];
UIImage* image = [UIImage imageWithData:data];
NSLog(#"Image --- %#", image);
Try this.. Hopefully it helps you.. Thanks