Byte array and INT Conversion

After converting the int type into a byte array in C #, it is stored in descending order, while in C ++ and Java, It is sorted in descending order, as a result, an error occurs when the converted byte array is directly communicated with C ++ or Java. It needs to be reversed and then transmitted.

Convert byte to int code

C # The conversion code is as follows:

C #

Byte [] bytes = {0, 0, 0, 25}; // if the system architecture is little-Endian (that is, little end first ), // reverse the byte array. if (bitconverter. islittleendian) // specifies the endian settings for determining the computer structure. reverse (bytes); // converts and sorts int I = bitconverter. toint32 (bytes, 0); console. writeline ("int: {0}", I); // output: INT: 25

The bitconverter. islittleendian field indicates the byte sequence ("endian") of data stored in this computer structure ).

If the structure is little-Endian, the value isTrueIf the structure is big-Endian, the value isFalse.
Different computer structures use different bytes to store data. "Big-Endian" indicates that the maximum valid byte is on the left side of the word. "Little-Endian" indicates that the maximum valid byte is on the right of the word.

 Convert int to byte code

C # The conversion code is as follows:

Byte [] AA = bitconverter. getbytes (1243 );
If (bitconverter. islittleendian)
Array. Reverse (AA );

 

The Java conversion code is as follows:

Public byte [] int2bytes (int A, Boolean ishighfirst)
{
Byte [] result = new byte [4];

If (ishighfirst)
{
Result [0] = (byte) (a> 24 & 0xff );
Result [1] = (byte) (a> 16 & 0xff );
Result [2] = (byte) (a> 8 & 0xff );
Result [3] = (byte) (A & 0xff );
}
Else
{
Result [3] = (byte) (a> 24 & 0xff );
Result [2] = (byte) (a> 16 & 0xff );
Result [1] = (byte) (a> 8 & 0xff );
Result [0] = (byte) (A & 0xff );
}
Return result;
}