Detect if an iPhone OS device can make phone calls

- (BOOL)deviceCanMakePhoneCalls

{

BOOL canMakePhoneCalls;

if ([UIApplication instancesRespondToSelector:@selector(canOpenURL:)]) {

// OS 3.0+, so use canOpenURL

UIApplication *app = [UIApplication sharedApplication];

canMakePhoneCalls = ([app canOpenURL:[NSURL URLWithString:@"tel:+44-1234-567890"]]);

} else {

// OS 2.x, so check for iPhone

UIDevice *device = [UIDevice currentDevice];

canMakePhoneCalls = ([device.model isEqualToString:@"iPhone"]);

}

return canMakePhoneCalls;

}

Convert Data/Image to Base64

-(NSString *)Base64Encode:(NSData *)data{
//Point to start of the data and set buffer sizes
int inLength = [data length];
int outLength = ((((inLength * 4)/3)/4)*4) + (((inLength * 4)/3)%4 ? 4 : 0);
const char *inputBuffer = [data bytes];
char *outputBuffer = malloc(outLength);
outputBuffer[outLength] = 0;

//64 digit code
static char Encode[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

//start the count
int cycle = 0;
int inpos = 0;
int outpos = 0;
char temp;

//Pad the last to bytes, the outbuffer must always be a multiple of 4
outputBuffer[outLength-1] = '=';
outputBuffer[outLength-2] = '=';

/* http://en.wikipedia.org/wiki/Base64
Text content M a n
ASCII 77 97 110
8 Bit pattern 01001101 01100001 01101110

6 Bit pattern 010011 010110 000101 101110
Index 19 22 5 46
Base64-encoded T W F u
*/


while (inpos < inLength){
switch (cycle) {
case 0:
outputBuffer[outpos++] = Encode[(inputBuffer[inpos]&0xFC)>>2];
cycle = 1;
break;
case 1:
temp = (inputBuffer[inpos++]&0x03)<<4;
outputBuffer[outpos] = Encode[temp];
cycle = 2;
break;
case 2:
outputBuffer[outpos++] = Encode[temp|(inputBuffer[inpos]&0xF0)>> 4];
temp = (inputBuffer[inpos++]&0x0F)<<2;
outputBuffer[outpos] = Encode[temp];
cycle = 3;
break;
case 3:
outputBuffer[outpos++] = Encode[temp|(inputBuffer[inpos]&0xC0)>>6];
cycle = 4;
break;
case 4:
outputBuffer[outpos++] = Encode[inputBuffer[inpos++]&0x3f];
cycle = 0;
break;
default:
cycle = 0;
break;
}
}
NSString *pictemp = [NSString stringWithUTF8String:outputBuffer];
free(outputBuffer);
return pictemp;
}