I'm trying to figure out the best approach to grab data from an array. So heres the deal. I have byte array called curveData[256] filled will hex bytes that I've downloaded from a unit under test. Basically, I am trying to loop through this array of 256 bytes. I want to grab the 1st byte (of a 4 byte chunk), so [0], then [4] [8] and so on…so every 4th byte starting with the first and throwing them into the rpmArray. Then I want to grab the bytes in between, [1][2][3] …etc, and throw them into another array called multOffArray. Here is my code below
|0|1|2|3|4|5|6| 7|…………|252|253| 254|255|
int i;
byte[] rpmArray = new byte[64];
byte[] multOffArray = new byte[192];
for (i = 0; i < curveData.Lengt h; i++ )
{
if (i%4 == 0 || i%4 == 4)
Array.Copy(curv eData, curveData[i], rpmArray, curveData[i], 1);
else
Array.Copy(curv eData, curveData[i], multOffArray, curveData[i+1], 3);
}
DisplayData(Mes sageType.Outgoi ng, "\n rpmArray: " + rpmArray);
DisplayData(Mes sageType.Outgoi ng, "\n multOffArray: " + multOffArray);
I'm getting errors saying that the index is out of bounds. When I check the bytes in the arrays where I’m storing this info, its not in the order that I anticipated and I am missing data. I tried to set it up so that at every index which is a multiple of 4, would initiate copying of data from the source array to my destination array. Maybe somebody can help me get this loop right. It's been a while since I've written code and I know this isn't right. If someone can help it'd be much appreciated.
3 1237
Would something like this be suitable? - System.Collections.ArrayList rpmArray = new System.Collections.ArrayList();
-
System.Collections.ArrayList multOffArray = new System.Collections.ArrayList();
-
-
for (int i = 0; i < curveData.Length; i++)
-
{
-
if (i % 4 == 0)
-
rpmArray.Add(curveData[i]);
-
else
-
multOffArray.Add(curveData[i]);
-
}
It bypasses the need for array management and if you want to treat the ArrayLists as arrays, just reference them by rpmArray.ToArra y() and multOffArray.To Array()
Or you could use the snazzy new LINQ to query the data set rather than iterating through it: - int rowIndex = 0;
-
-
var rpmQry =
-
from item in (
-
from value in curveData
-
select new {index = rowIndex++, value}
-
)
-
where item.index % 4 == 0
-
select item.value;
-
-
var rpmData = rpmQry.ToArray();
I tried to figure out a more succinct way of getting at the row indexes of each item to query for mod 4, but it's late and I'm tired... it would be nicer as a simple query rather than nested query. I started off with two queries, but I didn't like that it was being visited twice, until I wanted to reference it a second time for the multOffArray: - int rowIndex = 0;
-
var allDataQry = from item in curveData select new { index = rowIndex++, value = item };
-
var rpmArray = (from item in allDataQry where item.index % 4 == 0 select item.value).ToArray();
-
var multOffArray = (from item in allDataQry where item.index % 4 != 0 select item.value).ToArray();
-
Plater 7,872
Recognized Expert Expert
As for why you get index of bounds:
Think about what happens on the last itteration for i, i would be the last index in your array. So what would curveData[i+1] (Note: i+1) be, out of bounds.
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