Bits

[rifter1818]

Is there any way to Access Memory one bit at a time? Have say 9699690 bits of memory 1's and 0's and read and write to each memory bit?

[Joe Mamma]

Is there any way to Access Memory one bit at a time? Have say 9699690 bits of memory 1's and 0's and read and write to each memory bit?

1. Point to your memory and cast as a Int64[]

2. Grab each Int64 containing the bit you want to change.

3. Perform Bitwise arithmetic on the Int64 to modify the nth bit

 

to set bit n : myInt64 |= Math.Pow(2,n-1);

to clear bit n : myInt64 = ~(( ~myInt64 ) ^ ( Math.Pow(2,n-1) ));

 

There might be a more efficient method for the bit clear, but that should work.

Boolean algebra was always confusing to me.

 

joe mamma

Edited March 8, 2004 by Joe Mamma

[HJB417]

1. Point to your memory and cast as a Int64[]

2. Grab each Int64 containing the bit you want to change.

3. Perform Bitwise arithmetic on the Int64 to modify the nth bit

 

to set bit n : myInt64 |= Math.Pow(2,n-1);

to clear bit n : myInt64 = ~(( ~myInt64 ) ^ ( Math.Pow(2,n-1) ));

 

There might be a more efficient method for the bit clear, but that should work.

Boolean algebra was always confusing to me.

 

joe mamma

 

 

You can always have the BitArray Class do the math for you :D

[Nerseus]

Is there any way to Access Memory one bit at a time? Have say 9699690 bits of memory 1's and 0's and read and write to each memory bit?

 

Are you sure you mean one bit at a time and not one byte? If you did mean bit, try the suggestions above. If you meant byte, just create a byte array. Now if you want a specific chunk of memory that's a bit different. If you want a chunk in another process (not from your app, but someone else's) that's yet another story.

 

-ner

[Joe Mamma]

clarification of my original

 

Is there any way to Access Memory one bit at a time? Have say 9699690 bits of memory 1's and 0's and read and write to each memory bit?

I just want to clarify that you need to work with the values in the array, as I am afraid, you might not get what you are looking for.

 

 

1. Point to your memory and cast as a Int64[], myInt64s

2. Advance to the Int64 containing the bit you want to change.

3. Perform Bitwise arithmetic to modify the nth bit of myInt64s

to set bit n : myInt64 |= Math.Pow(2,n-1);

to clear bit n : myInt64 = ~((~myInt64)^(Math.Pow(2,n-1)));

 

There might be a more efficient method for the bit clear, but that should work. Boolean algebra was always confusing to me.

 

joe mamma