How do I read data with ByChunk?

2011-03-18 Thread Craig Dillabaugh 
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

Re: How do I read data with ByChunk?

2011-03-18 Thread 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.

Re: How do I read data with ByChunk?

2011-03-18 Thread Craig Dillabaugh 
== Quote from Zirneklis (a...@dingspam.cc)'s article
 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 ...
 }

Thanks, that did the trick!
Craig