objective-c：如何为NSMutableData分配字符串？ [英] objective-c: how to assign string to NSMutableData?

问题描述

我要将数据发送到数字仪表，我想要NSMutableData表格中的数据。我试图分配数据，但收到错误。

I am to send data to digital meter for which I want data in NSMutableData form. I am trying to assign it data but getting errors.

NSMutableData *body = [[NSMutableData alloc] initWithData:[NSData @"1"];

我想签名字符串，例如NSMutableData的1，start等。

I want to asign string e.g. "1", "start" etc to NSMutableData.

推荐答案

您无法直接从NSString转换为 NSMutableData ，首先必须将字符串编码为 NSData 。 （有几种方法可以从NSData转到NSMutableData，但我认为 mutableCopy 是最清晰的。）;

You can't convert directly from an NSString to NSMutableData, you have to encode the string as NSData first. (There are several ways to go from NSData to NSMutableData, but I think mutableCopy is the clearest.);

试试这个：

NSString *yourString  = @"Your string text";
NSData *data = [yourString dataUsingEncoding:NSUTF8StringEncoding];
NSMutableData *body = [data mutableCopy];

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