Thread: bitwise operations

I am trying to use bitwise operators to fill a unsigned char with data. the data i want to put in is the binary number 0 0 0 1 0 1 1 1
However the data comes in backwards so when reading the data i get 1 1 1 0 1 0 0 0
i currently have a for loop like so

Code:

unsigned char achar
for ( int n = 0; n < 8; n++)
{
     Obtain next Bit;
     achar = 
}

i cant figure out what to put after the equals as the data comes back the wrong way around, also it comes in one at a time, i've tried all sorts, shifts etc. I think i need to use an or, but cant seem to implement it :S
cheers for any help in advance

If you're getting it the wrong way around, just change the limits of your loop:

for ( int n=7; n>=0; n-- )

and do the same.

but how would i go about changing 8 individual binary bits into a combined 8 bit char ?

So, you have a char and you want to get its binary values or something?

Have you looked into the <bitset> library? Could help you.

nah, the other way around, i have a binary value, which is the binary of a text file, i would like to pop this into an unsigned char array, im then going to output the results as a text file.

Code:

				buffer[n] |= BinNumber << i;

where buffer[n] is a binary version of a text file.

This line of code seemed to do the trick, i do get some problems though, ocassionally when writing the binary back to a "text" file certain characters and positions seem to just terminate the output for now reason o.o

the entire loop to extract the binary from a image looks as follows

Code:

	for (int y=0; y < Dest->Picture->Bitmap->Height; y++)
	{
		for (int x=0; x < Dest->Picture->Bitmap->Width; x++)
		{
			if( x == RandX[PixelIndex] && y == RandY[PixelIndex] )
			{
				Pixel.Colours = Dest->Canvas->Pixels[x][y];
				ColorToRGB(Pixel.Colours);

				CurrentColour = GetRValue(Pixel.Channel.Red);

				BinNumber = (CurrentColour >> 0) & 1;
				buffer[n] |= BinNumber << i;

				PixelIndex++;

				x = 0;
				y = 0;
				i++;
				if( i > 7 )
				{
					buffer[n + 1] = 0;
					n++;
					i = 0;
				}
			}
		}
	}