Removing chars per index in a char array

Projects Programming
1

hello guys

how could i remove certain parts of a char array ?

like i have a

char InitialChar[20];

ho can i remove first and last slice so it becomes a new char or resize to itself containg all but first and last?
char clean[18]

or is there a way to delete per index like in the this StringDelete(string &sDest, const int nIndex, const int nSize)

or similar ?

cheers

2

Well one way would be to shift the elements.

for(byte d = 0; d < 20; d++)
{
Array[d] = Array[d+1];
}

This will shift out the first element, and you use an IF statement, to add a NULL or 0 in the last element.

Or.

The other way would be to simply copy the elements of the Array to a new one, starting at the second element and stop before it gets to the last element.

3

In the context of your other thread, you don't need to. You can simply adjust your packet parsing code to start at packetBuffer[1] instead of packetBuffer[0] . Removing them is more trouble than it's worth in this case.

4

hi HazardsMind and wildbill

thank you for your replies .

yes i was thinking something like this but i thought maybe there was an arduino or C function for this cases ?.

if i do start at packetBuffer[1] instead of packetBuffer[0] is fine but , i need to assign the whole loop to a function so for the start i guess i can do i+1 and to get rid of the last one i guess do the loop (i-1)++. just wanted to clean it as much as possible for further easy logic.

;D

5 
char someBuffer[20];
char subBuffer[18];

...

memcpy(subBuffer,someBuffer+1,18);

That will copy 18 bytes into subBuffer[] starting from someBuffer[1]

If you want to just shift your starting point, you can just do this:

char packetBuffer[20];
char* ptr = packetBuffer + 1;
ptr[0] = whatever; //set packetBuffer[1] = whatever

Then in you can access packetBuffer[1] as ptr[0] and so on.

6

hi cool , i,ll try it also.

i got it working like that thank you

char CleanBuffer [packetSize-HeaderEndSize];
memcpy(CleanBuffer,packetBuffer+HeaderSize,packetSize-HeaderEndSize);