如何为Uint8变量分配字符串? [英] How can I assign a string to a Uint8 variable?

问题描述

我正在尝试为Uint8变量分配一个字符串，它无法进行类型转换或类似的操作，所以我首先要做的就是通过文件进行分配，这样我首先将字符串写入stderr .txt，然后使用fscanf读取字符串.我使用fscanf是因为您可以选择读取哪种类型，所以我将成功将字符串转换为Uint8，对吗?错误的！然后，我发现程序在执行过程中不会写入普通字符，因此，如果字符串包含例如"Test"，则Uint8将包含(！µ @""之类的内容，因为该文件不包含普通字符.执行过程中的字符.
现在我的问题很简单:我如何为Uint8变量分配一个字符串，以便如果该字符串包含"Test"，那么Uint8变量将表示"Test"?(当然，其格式也不同)
所以我想这样使用它:
Uint8数据；
字符串str;
数据= str;

*做任何事情*

I am trying to assign a string to a Uint8 variable, it didn''t work to typecast or anything like that so what I tried to do first was to assign via a file so that I would first write the string to stderr.txt and then use fscanf to read the string. I used fscanf because you can choose what type to read with and so then I would have successfully converted the string to Uint8, right? Wrong! I then found out that the program doesn''t write normal characters during execution so that if the string contained for example "Test", then the Uint8 would contain something like "(!µ@" because the file didn''t contain normal characters during execution.
Now my question is simply this: how do I assign a string to a Uint8 variable so that if the string contains "Test", then the Uint8 variable will conatin "Test"?(but in a diffrent format of course)
So i would like to use it like this:
Uint8 data;
string str;
data = str;

*do whatever*

推荐答案

来自 MSDN [ ^ ]:

From MSDN[^]:

UINT8
一个8位无符号整数(范围:0到255十进制).由于UINT8是无符号的，因此它的第一位(最高有效位(MSB))不保留用于签名.

在BaseTsd.h中声明此类型，如下所示:

UINT8
An 8-bit unsigned integer (range: 0 through 255 decimal). Because a UINT8 is unsigned, its first bit (Most Significant Bit (MSB)) is not reserved for signing.

This type is declared in BaseTsd.h as follows:

typedef unsigned char UINT8;

因此，您不能将string分配给UINT8变量.但是，您可以将char分配给UINT8变量.

So you cannot assign a string to an UINT8 variable. You can however assign a char to an UINT8 variable.

Uint8* pdata;
string str;
pData = new Uint8[str.length() + 1];
memcpy (pdata, str.c_str(), str.length() + 1);

请记住，您无法以尝试的方式将一种类型转换为另一种类型； string和Uint8完全不兼容.

Remember you cannot cast from one type to another in the way you tried; a string and a Uint8 are not in any way compatible.

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