四、读取一系列dcm图片，然后重新写入

#pragma warning(disable:4996)
#include "itkGDCMImageIO.h" 
#include "itkGDCMSeriesFileNames.h" 
#include "itkImageSeriesReader.h" 
#include "itkImageSeriesWriter.h"

int main(int argc, char** argv)
{
    //定义像素类型，图像类型，三维有符号数，定义指针
    typedef signed short PixelType;
    const unsigned int Dimension = 3;
    typedef itk::Image< PixelType, Dimension > ImageType;
    typedef itk::ImageSeriesReader< ImageType > ReaderType;

    //声明读、写 DICOM 图 像 的 itk::GDCMImageIO对象
    //itk::GDCMSeriesFileNames对象将生成并将构成所有体数据的切片的文件名进行排序
    typedef itk::GDCMImageIO ImageIOType;
    typedef itk::GDCMSeriesFileNames NamesGeneratorType;
    ImageIOType::Pointer gdcmIO = ImageIOType::New();
    NamesGeneratorType::Pointer namesGenerator = NamesGeneratorType::New();

    //设置读取路径
    //用文件名发生器生成被读的文件名和被写的文件名
    namesGenerator->SetInputDirectory("D:\\Files\\ITKFiles\\ITK_5_ReadSeriesDCM\\Data\\InputData");
    const ReaderType::FileNamesContainer& filenames =namesGenerator->GetInputFileNames();

    //设置DICOM图像IO对象和被读的文件名的列表
    ReaderType::Pointer reader = ReaderType::New();
    reader->SetImageIO(gdcmIO);
    reader->SetFileNames(filenames);
    try
    {
        reader->Update();
    }
    catch (itk::ExceptionObject& ex)
    {
        std::cout << ex << std::endl;
        return EXIT_FAILURE;
    }
    //得到输出目录的名字
    const char* outputDirectory = "D:\\Files\\ITKFiles\\ITK_5_ReadSeriesDCM\\Data\\OutputData";
    //如果目录
    //还不存在的话，我们就选择创建目录。
    itksys::SystemTools::MakeDirectory(outputDirectory);

    //实例化写图像的程序
    typedef signed short OutputPixelType;
    const unsigned int OutputDimension = 2;
    typedef itk::Image< OutputPixelType, OutputDimension > Image2DType;
    typedef itk::ImageSeriesWriter<ImageType, Image2DType > SeriesWriterType;

    //我们创建一个序列图像writer并从reader的输出连接writer的输入。这时我们传递GDCM
    //图像IO对象以便能用DICOM格式写这个图像。
    SeriesWriterType::Pointer seriesWriter = SeriesWriterType::New();
    seriesWriter->SetInput(reader->GetOutput());
    seriesWriter->SetImageIO(gdcmIO);

    namesGenerator->SetOutputDirectory(outputDirectory);
    seriesWriter->SetFileNames(namesGenerator->GetOutputFileNames());
    seriesWriter->SetMetaDataDictionaryArray(reader->GetMetaDataDictionaryArray());
    try
    {
        seriesWriter->Update();
    }
    catch (itk::ExceptionObject& excp)
    {
        std::cerr << "Exception thrown while writing the series " << std::endl;
        std::cerr << excp << std::endl;
        return EXIT_FAILURE;
    }
    return EXIT_SUCCESS;
}