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.