Re: How do I read data with ByChunk?

[Zirneklis]

On 18/03/2011 14:35, Craig Dillabaugh wrote:

Hi,
I have two binary files containing image data, and I want to go through them 
pixel by
pixel and read the image data into arrays and compare the pixel values (images 
have the
exact same dimensions but one is unsigned 1 byte per pixel, and the other 
signed 2 bytes
per pixel).

I am trying to read the data in using the following loop:

        for(int i = 0; i<  num_blocks; i++) {
                auto resampbytes = resampFile.byChunk( resamp_buffer_size );
                auto normbytes = normalFile.byChunk( normal_buffer_size );
                ubyte[] resamp = cast(ubyte[]) resampbytes;
                short[] normaldata = cast(short[]) normbytes;

                 //Process the data ...
        }

However, when I attempt to compile this I get the following errors:

Error: cannot cast from ByChunk to ubyte[]
Error: cannot cast from ByChunk to short[]

Oddly, the example for ByChunk in the documentation seems to do exactly what I 
think I
am trying here, but apparently I am missing something.

Any help would be appreciated (also if there is a better way of doing what I am 
trying
to do any pointers on that would be appreciated too!)

Regards,

Craig

File.byChunk is designed to be used with a foreach loop, you could try:

ubyte[] resamp = new ubyte[resamp_buffer_size];
short[] normaldata = new short[normal_buffer_size];
for(int i = 0; i < num_blocks; i++)
{
    resampFile.rawRead(resamp);
    normaldata.rawRead(normaldata);

    //Process the data ...
}

--
Aku MoD.