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Can we read 4th byte from hexadecimal value?


Can we read 4th byte from hexadecimal value?

By : user2956419
Date : November 22 2020, 10:56 AM
Hope this helps Actually I am not so clear about it so I put a question here, and I am also new to bit calculation. My scenario is like this, I get some hexadecimal value from CAN (A hardware device) , for one perticular value I have to read 4th byte , in this 4th byte the value of bit 5 and 6 decides the output to be written, I mean if 5 & 6 th bit is 00= off , 01= on like this. So my question is , how can we read 4th or any particular byte and in byte particular bits from a hexadecimal. If possible please give me some guidance or examples or any tutorial sites. I googled a lot but no use . Please help me in this. and I want this to be done in java. , Assume that the value is 32 bit.
code :
for example assume the input is 0x4FAEBCDB
That is 
0x4FAEBCDB & 0x000000FF = 0xDB
for 5th bit 
   0xDB & (1<<5)
for 6th bit
   0xDB & (1<<6)
 0x4FAEBCDB & (0xFF000000)
 Similarly (1<<5) generates 00010000.


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Python - How to edit hexadecimal file byte by byte

Python - How to edit hexadecimal file byte by byte


By : user1414263
Date : March 29 2020, 07:55 AM
wish helps you Python standard library has mmap module, which can be used to do exactly this. Take a look on the documentation for further information.
Is there a simpler way to convert a byte array to a 2-byte-size hexadecimal string?

Is there a simpler way to convert a byte array to a 2-byte-size hexadecimal string?


By : user1919797
Date : March 29 2020, 07:55 AM
This might help you Apache Commons-Codec has the Hex class, which will do what you need:
code :
String hexString = Hex.encodeHexString(bytes);
Java: Convert a hexadecimal encoded String to a hexadecimal byte

Java: Convert a hexadecimal encoded String to a hexadecimal byte


By : sam7105
Date : March 29 2020, 07:55 AM
hop of those help? You can use Byte.parseByte(str, 16), that will return the byte value represented by the hexadecimal value in str.
Java: Simply convert a decimal byte to a hexadecimal byte

Java: Simply convert a decimal byte to a hexadecimal byte


By : Luke
Date : March 29 2020, 07:55 AM
I wish this helpful for you A byte is just a sequence of bits in memory -- it doesn't matter how it's represented visually, and two different representations can mean the same thing. If all you want is a hex literal, you can try this:
code :
byte dec = 10;
byte hex = 0xA;  // hex literal

System.out.println(dec == hex);
true
byte dec = 10;
System.out.println(Integer.toHexString(dec));
a
Why am i getting 3 bytes instead 1 byte after hexadecimal/string/byte conversion in java?

Why am i getting 3 bytes instead 1 byte after hexadecimal/string/byte conversion in java?


By : Oldcustard
Date : March 29 2020, 07:55 AM
it should still fix some issue Don't know what exactly you try to achieve. But find below what you are doing.
Integer.parseInt(hexadecimal.substring(j, j + 2), 16) returns 175 (byte) 175 is -81 new String(decimal) tries to create an String from this byte array related to your current character set (probably it's UTF-8)
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