如何使用bitConverter.ToInt32方法从大端在c＃小尾数数据？ [英] How to get little endian data from big endian in c# using bitConverter.ToInt32 method?

问题描述

我想提出在C＃中。在该应用程序，我有字节数组包含十六进制值。

i am making application in c#.In that application i have byte array containing hex values.

下面我得到的数据作为大端，但我想它作为一个小尾数。

Here i am getting data as a big endian but i want it as a little endian.

下面我使用 Bitconverter.toInt32 方法转换该值为整数。

Here i am using Bitconverter.toInt32 method for converting that value to integer.

不过，我的问题是转换值之前，我必须复制从源代码的字节数组4字节数据到临时数组，然后扭转这种临时的字节数组。

But my problem is that before converting value,i have to copy that 4 byte data into temporary array from source byte array and then reverse that temporary byte array.

我不能扭转源阵列，因为它包含的其他数据也。

I cant reverse source array because it contains other data also.

由于我的应用程序变得缓慢。
code在这里，我有一个字节一个源阵列waveData []，它包含了很多很多的数据。

Because of that my application becomes slow. code Here i have one source array of byte as waveData[].It contains lot much of data.

byte[] tempForTimestamp=new byte[4];
tempForTimestamp[0] = waveData[290];
tempForTimestamp[1] = waveData[289];
tempForTimestamp[2] = waveData[288];
tempForTimestamp[3] = waveData[287];
int number = BitConverter.ToInt32(tempForTimestamp, 0);

是否有该转换任何其他方法？

Is there any other method for that conversion?

推荐答案

如果您知道数据是大端，也许只是做手工：

If you know the data is big-endian, perhaps just do it manually:

int value = (buffer[i++] << 24) | (buffer[i++] << 16)
          | (buffer[i++] << 8) | buffer[i++];

这将可靠地运行任何CPU上了。注 I 是当前偏移到缓冲区中。

this will work reliably on any CPU, too. Note i is your current offset into the buffer.

另一种方法是洗牌阵列

byte tmp = buffer[i+3];
buffer[i+3] = buffer[i];
buffer[i] = tmp;
tmp = buffer[i+2];
buffer[i+2] = buffer[i+1];
buffer[i+1] = tmp;
int value = BitConverter.ToInt32(buffer, i);
i += 4;

我找到的第一个极大的可读性，并且没有分支机构/复杂的code，所以它应该工作pretty快。第二个也可能会遇到一些平台（其中CPU已经运行大端）的问题。

I find the first immensely more readable, and there are no branches / complex code, so it should work pretty fast too. The second could also run into problems on some platforms (where the CPU is already running big-endian).

这篇关于如何使用bitConverter.ToInt32方法从大端在c＃小尾数数据？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！