NSString NSData Byte等互转
```objc
NSString *testString = @"1234567890";
NSData *testData = [testString dataUsingEncoding: NSUTF8StringEncoding];
Byte *testByte = (Byte *)[testData bytes];
for(int i=0;i<[testData length];i++)
printf("testByte = %d\n",testByte);
NSData *data = [NSData dataWithBytes:(const void *)dataOut length:(NSUInteger)dataOutMoved];
NSUInteger len = [data length];
Byte *byteData = (Byte*)malloc(len);
memcpy(byteData, [data bytes], len);
for (int i = 0; i
NSLog(@"%d",byteData ［i］ );
Objective-C NSString NSData Byte等转换
//整形转NSString，其他数字类型类似
inti= 123;
NSString*str = [NSString stringWithFormat:@"%d", i];
// NSSting转整形，转其他数字类型类似
i= [str intValue];
float f = [str floatValue];
{
// NSData --> NSString
Byte array[] = {0, 0, 0, 0};
NSData*data = [NSData dataWithBytes: array length:sizeof(array)];
NSString*string = [[NSString alloc]initWithData: data encoding:NSUTF8StringEncoding];
}
{
// NSString --> NSData
NSString*string =@"Hello,World!";
NSData*data = [string dataUsingEncoding:NSUTF8StringEncoding];
}
{
// NSData --> Byte
Byte array[] = {0, 0, 0, 0};
NSData*data = [NSData dataWithBytes: array length:sizeof(array)];
Byte*bytes = (Byte*)[data bytes];
}
{
// NSString --> hex
NSString*string =@"1a1b1c1d";
constchar*buf = [string UTF8String];
NSMutableData*data = [NSMutableData data];
if(buf)
{
uint32_tlen =strlen(buf);
charsingleNumberString[3] = {'\0', '\0', '\0'};
uint32_tsingleNumber = 0;
for(uint32_ti = 0 ; i < len; i+=2)
{
if( ((i+1) < len) &&isxdigit(buf[i]) && (isxdigit(buf[i+1])) )
{
singleNumberString[0] = buf[i];
singleNumberString[1] = buf[i + 1];
sscanf(singleNumberString,"%x", &singleNumber);
uint8_ttmp = (uint8_t)(singleNumber & 0x000000FF);
[dataappendBytes:(void*)(&tmp)length:1];
}
else
{
break;
}
}
}
}
原文http://blog.csdn.net/jjunjoe/article/details/7546790
NSdata 与 NSString，Byte数组，UIImage 的相互转换---ios开发 Objective-C
http://blog.sina.com.cn/s/blog_45e2b66c010102va.html
Object-C 中各数据类型转换 NSData转NSString，Byte，UIImage
http://blog.csdn.net/bailu66/article/details/7665357
}
```
