What is the fastest way to modify a byte array?

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I need to modify a byte array that I've read from my memory.... a need to modify it an then rewrite to my flash all it again..but i need to do it faster.. what is the fastest way to do that?............ thanks in advance

My code:

byte []array1 = {3,4,2};
byte[] mybufferarry = ReadArrayFromFile();
int k = 0;
for(int i = 5 ; i < 3 ; i++)
    mybufferarray[i] = array1[k++];

Posted 8-Jul-11 3:14am

glbrt.gds

Updated 8-Jul-11 4:32am

fjdiewornncalwe

v2

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harish85 8-Jul-11 10:39am

5<3 ?

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#realJSOP · Answer 1 · 2011-07-08T03:20:00

Solution 1

How can we possibly answer this with the information you've given us?

EDIT ================

Your sample sucks. The loop you specified won't have any effect on mybuffarray because you're starting the loop at 5, and going until the loop is 3, and INCREASING the loop control variable.

Posted 8-Jul-11 3:20am

#realJSOP

Updated 8-Jul-11 4:39am

v2

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glbrt.gds 8-Jul-11 9:42am

sorry ......... i only need to know how to modify my array of bytes the other work is already done...I've read already the bytes and etcc..... "only need to know if is there a way to modify my array no using the common for(int i = 5 ; i++) bytearray[i] = otherarray[k++];

S Houghtelin 8-Jul-11 9:54am

Perhaps you are already doing it the fastest way that it can be done, without seeing the code we cannot help you.

Please update your question, "etc. etc." is not valid syntax.

fjdiewornncalwe · Answer 2 · 2011-07-08T04:06:00

If you know the specific bytes you wish to change then just set them using bytearray[x] = value directly. If the byte array is very large and you do not want to iterate through each item in the list then you could create an update dictionary with an index and new value. Then you just have to iterate through the dictionary changing only the bytes necessary.

Based on your code snippet, you have bigger issues that you think.
There is no way that your for loop will ever execute anything. You initialize i to 5 and only run if it is less than 3. How is that going to work? Fix your for loop first and then try debugging again.

BobJanova · Answer 3 · 2011-07-08T05:47:00

Solution 4

Can you use Memory Mapped Files[^] (.Net 4)?

Without knowing more about your problem it is impossible to answer. Direct indexed access to a byte array in memory should be fast enough, I strongly suspect (particularly given your inability to provide a working for loop in your sample) that any speed problems you are having are elsewhere in your code.

Posted 8-Jul-11 5:47am

BobJanova

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glbrt.gds 8-Jul-11 12:52pm

sorry but...I don't know what else do you need to know..I'm just wondering if are there some others ways to modify a byte array...just that...the error on my sample (in my loop) was just a writing error posting it... just that, it is not an error that I've in my real code...

What is the fastest way to modify a byte array?

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