如何检查字节的最后一位 [英] how to check last bit of byte is one

问题描述

我有:

byte[] buffer;
if((buffer[6])&(0x01))
{

}

我想检查第6个字节中的最后一位是否应该为1，因此我正在应用此操作，但它引发了我错误:无法将类型"int"隐式转换为"bool".

I want to check the last bit in the 6th byte should be one so I am applying this but it throws me error: Cannot implicitly convert type ''int'' to ''bool''.

推荐答案

无法将类型"int"隐式转换为"bool".
看起来您在IF语句中的表达式没有被评估为布尔值.可能是错误的&"运算符?

Cannot implicitly convert type ''int'' to ''bool''.
Looks like your expression in the IF statement is not evaluating as a boolean value. Probably a wrong ''&'' operator?

byte[] buffer;
byte one = 1 ;
if((buffer[6])== one)

或:
使用 MSDN:Byte.CompareTo方法(字节)
[^ ]

Or:
Use MSDN: Byte.CompareTo Method (Byte)
[^]

if(one.CompareTo(buffer[6]))
{
}

你好，

试试这个:

hello,

Try this:

byte[] teste = new byte[3];
teste[0] = 0x01;
teste[1] = 0x02;
teste[2] = 0x03;

if (teste[2].Equals(0x03))
{
}
else
{
}

问题是您的if语句正在使用按位AND运算符计算数值. C#不会将整数零/非零隐式转换为布尔值false/true.
只需将AND的结果与零进行比较:

The problem is that your if statement is computing a numeric value with the bit-wise AND operator. c# does not implicitly convert integer zero/non-zero to boolean false/true.
Just compare the result of the AND against zero:

if((buffer[6] & 0x01) != 0)
{
  // low-order bit is set
}

如果需要同时检查多个位，请与位掩码进行比较:

If you needed to check for multiple bits at the same time, compare against the bitmask:

if((buffer[6] & 0x81) == 0x81)
{
  // both highest-order and low-order bits (binary: 10000001) are set
}

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