Question

我有一个从 Web 服务返回的数组，其中包含字节值（非二进制格式，即 0-255）。它们代表缩略图。我想需要从这些值创建一个 NSData 对象。我该怎么做？

Answer 1

+ (id)dataWithBytes:(const void *)字节长度:(NSUInteger)长度是你的朋友：

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];
}