c how to add byte to byte array

Question

How to add a byte to the beginning of an existing byte array  My goal is to make array what s 3 bytes long to 4 bytes  So that s why I need to add 00 padding in the beginning of it

User · Accepted Answer

You can t do that  It s not possible to resize an array  You have to create a new array and copy the data to it   bArray   addByteToArray bArray   newByte     code   public byte   addByteToArray byte   bArray  byte newByte        byte   newArray   new byte bArray Length   1       bArray CopyTo newArray  1       newArray 0    newByte      return newArray

User · Answer

To prevent recopy the array every time which isn t efficient  What about using Stack  csharp gt  var i   new Stack lt byte gt     csharp gt  i Push 1   csharp gt  i Push 2    csharp gt  i Push 3    csharp gt  i    3  2  1    csharp gt  foreach var x in i       gt        Console WriteLine x      gt          3 2 1

User · Answer

Although internally it creates a new array and copies values into it  you can use Array Resize lt byte gt    for more readable code  Also you might want to consider checking the MemoryStream class depending on what you re trying to achieve

User · Answer

As many people here have pointed out  arrays in C   as well as in most other common languages  are statically sized  If you re looking for something more like PHP s arrays  which I m just going to guess you are  since it s a popular language with dynamically sized  and typed   arrays  you should use an ArrayList   var mahByteArray   new ArrayList lt byte gt       If you have a byte array from elsewhere  you can use the AddRange function   mahByteArray AddRange mahOldByteArray     Then you can use Add   and Insert   to add elements   mahByteArray Add 0x00      Adds 0x00 to the end  mahByteArray Insert 0  0xCA     Adds 0xCA to the beginning    Need it back in an array   ToArray   has you covered   mahOldByteArray   mahByteArray ToArray

User · Answer

Arrays can t be resized  so you need to allocte a new array that is larger  write the new byte at the beginning of it  and use Buffer BlockCopy to transfer the contents of the old array across

User · Answer

Simple  just use the code below  as I do           public void AppendSpecifiedBytes ref byte   dst  byte   src                   Get the starting length of dst         int i   dst Length             Resize dst so it can hold the bytes in src         Array Resize ref dst  dst Length   src Length              For each element in src         for  int j   0  j  lt  src Length  j                             Add the element to dst             dst i    src j                  Increment dst index             i                            Appends src byte to the dst array     public void AppendSpecifiedByte ref byte   dst  byte src                   Resize dst so that it can hold src         Array Resize ref dst  dst Length   1              Add src to dst         dst dst Length - 1    src

[c#] c# how to add byte to byte array

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