将NSArray的字节值转换为NSData

Question

我有一个从包含字节值（非二进制格式，即0-255）的Web服务返回的数组。这些代表缩略图。我想需要从这些值创建一个NSData对象。我怎样才能做到这一点？

Answer 1

+ (id)dataWithBytes:(const void *)bytes length:(NSUInteger)length是你的朋友：

void bytesToNSDataExample() { 
    unsigned char bytes[] = {'h', 'e', 'l', 'l', 'o'}; 
    NSData *data = [NSData dataWithBytes:bytes length:5]; 

    NSString *string = [[NSString alloc] initWithData:data encoding:NSISOLatin1StringEncoding]; 
    NSLog(@"%@", string); 

    // if data was a image like in your case, you would probably do something like this: 
    NSImageRep *imgRep = [NSBitmapImageRep imageRepWithData:data]; 
}