Send image to web service - iphone

Question

I want send an image from my App to web service, to do it, im send the data like an NSData, but it do nothing:
NSData *imagen= UIImagePNGRepresentation(windowImage);
The Web Service wait the data like: base64Binary
To send this type of data, i know that i need convert the NSData to NSString using the famous method "base64Encoding"
NSData *imagen=UIImagePNGRepresentation(windowImage);
NSString *encoded= [imagen base64Encoding];
And i Send the data like SOAP:
NSString *soapMsg= [NSString stringWithFormat:............<imagenBase64>%#<imagenBase64>,encoded];
Where is the error? I need to do other conversion?

Answer 1

See the following answers. Do like this.
NSData *imagen=UIImagePNGRepresentation(windowImage);
NSString *base64String = [self base64StringFromData:imagen length:[imagen length]];
Now, send this base64string to your web service.
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', '+', '/'
};
+ (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[i] = raw[ix];
else
input[i] = 0;
}
output[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[i]]]];
for (i = ctcopy; i < 4; i++)
[result appendString: #"="];
ixtext += 3;
charsonline += 4;
if ((length > 0) && (charsonline >= length))
charsonline = 0;
}
return result;
}

Answer 2

I tried the code which Raj posted as an answer, and worked perfectly for my iPhone app.
But then I realised that you can do the same thing using one line of code:
NSString* base64string = [imageData base64EncodedStringWithOptions:NSDataBase64Encoding76CharacterLineLength];
And to convert your base64 string back into a binary:
NSData* imageData = [[NSData alloc] initWithBase64EncodedString:base64string options:0];
Blimey.
For once, with Objective-C, that was easier than expected...!