指针和固定大小的缓冲区 [英] Pointers and fixed size buffers

问题描述

大家好

希望可以有人帮帮我.我有以下代码:

Hi guys

Hope someone can help me. I have the following code :

void responseCode (char challenge0,
                               char challenge1,
                               char challenge2,
                               char challenge3,
                               char challenge4,
                               char challenge5,
                               char* response0,
                               char* response1,
                               char* response2,
                               char* response3,
                               char* response4,
                               char* response5)
                               {
                                   char b0, b1, b2, b3, b4, b5;
                                   b0 = byteConv (challenge0, 0);
                                   b1 = byteConv (challenge1, 1);
                                   b2 = byteConv (challenge2, 2);
                                   b3 = byteConv (challenge3, 3);
                                   b4 = byteConv (challenge4, 4);
                                   b5 = byteConv (challenge5, 5);
                                   *response0 = Convert.ToChar((b1 + b2 - b3 + b4 - b5) ^ b0);
                                   *response1 = Convert.ToChar((b2 + b3 - b4 + b5 - b0) ^ b1);
                                   *response2 = Convert.ToChar((b3 + b4 - b5 + b0 - b1) ^ b2);
                                   *response3 = Convert.ToChar((b4 + b5 - b0 + b1 - b2) ^ b3);
                                   *response4 = Convert.ToChar((b5 + b0 - b1 + b2 - b3) ^ b4);
                                   *response5 = Convert.ToChar((b0 + b1 - b2 + b3 - b4) ^ b5);
                               }

但是我在这条线上出现错误:char * response0，
读取错误:指针和固定大小的缓冲区只能在不安全的上下文中使用.


如果有人可以帮助，它将被申请

在此先感谢

However I get an error on this line : char* response0,
The error reads : Pointers and fixed size buffers may only be used in an unsafe context.


If anyone can assist it will be appriciated

Thanks in advance

推荐答案

在C#中，仅当您使用不安全的方法时，才可以使用指针:

In C#, you can only use pointers when you are in an unsafe method:

private unsafe void responseCode (char challenge0,...
   {
   ...
   }

您还必须在项目属性中指定允许不安全的代码".

这是因为在C#中实际上不建议使用指针-在99.9999％的时间内，您不需要使用指针，因为引用可以完成工作.

You also have to specify "Allow unsafe code" in the project properties.

This is because pointers are really discouraged in C# - 99.9999% of the time, you do not need to use them, as references will do the job.

首先，应该允许不安全的指针;这是项目的财产.
在执行此操作时，请使用unsafe语句:

http://msdn.microsoft.com/en-us/library/chfa2zb8％28v = vs.100％29.aspx [ ^ ].

学习本教程:
http://msdn.microsoft.com/en-us/library/aa288474％28v = vs.71％29.aspx [ ^ ].

最后，问问自己:为什么要尝试使用指针?通常，出于性能原因，与某些非托管代码进行互操作时需要使用此命令，在极少数情况下，需要这样做.

—SA

First of all, you should allow unsafe; this is the property of the project.
When you do it, use unsafe statement:

http://msdn.microsoft.com/en-us/library/chfa2zb8%28v=vs.100%29.aspx[^].

Study this tutorial:
http://msdn.microsoft.com/en-us/library/aa288474%28v=vs.71%29.aspx[^].

Finally, ask yourself: why are you trying to use pointer? Usually, this is needed for interoperation with some unmanaged code, and in much more rare cases, for performance reasons.

—SA

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