[vtkusers] What's wrong with my codes? (convert image to BMP)

[vince xu]

Could you look my simple codes?
I am so confused by that why these simple codes do not work.

How could I force vtkImagereader read data from files to memory?
In my program,when "output->CopyAndCastFrom( input,extent );" was executed,
it seems that "input" has no data at all.

#include "vtkimagewriter.h"
#include "vtkbmpwriter.h"
#include "vtkImageCast.h"

void main()
{
	vtkImageReader *reader;
	vtkBMPWriter *writer;

	vtkImageData *input,*output;
	int extent[6]={0,63,0,63,1,93};
	
	char fname[100];
	strcpy( fname,"Data/headsq/quarter" );
	reader = vtkImageReader::New();
	reader->SetDataByteOrderToBigEndian();
	reader->SetDataExtent(extent);
	reader->SetFilePrefix(fname);
	reader->SetFilePattern("%s.%d");
	reader->SetDataSpacing(3.2, 3.2, 1.5);
	input = reader->GetOutput();

	output = vtkImageData::New();
	output->SetScalarTypeToUnsignedChar();
	output->CopyAndCastFrom( input,extent );

	strcpy( fname,"Data/headsq/bewrited" );
	writer = vtkBMPWriter::New();
	writer->SetFilePrefix(fname);
	writer->SetFilePattern("%s.%d.BMP");

	writer->SetInput(output);
	writer->Write();
	reader->Delete();
	writer->Delete();
}



>From: "Zhang zhijun" <zjzhang at ee.cuhk.edu.hk>
>
>the headsq data are short format data, you cant' use the
>switch SetDataScalarTypeToUnsignedChar() to set these data,
>you can use a vtkImagecast to first change the data to
>a unsignedchar data then write it to a bmp file.
>
>regards,
>zhang zhijun

>vince_xu wrote:
> I want to convert the files
> quarter.1 --> quarter.1.bmp
> quarter.2 --> quarter.2.bmp
> quarter.3 --> quarter.3.bmp
> ......
> and so on.(files quarter.1 quarter.2......are available in
> VtkData\data\headsq which was unzipped from VTKDATA.zip)
>



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