[ITK Community] [Insight-users] newbie C++ question
Luis Ibanez
luis.ibanez at kitware.com
Sat Jan 11 11:56:36 EST 2014
Massinissa,
What is wrong with the code in your example,
is that, in the expression
typedef itk::ImageIOBase::IOComponentType ScalarPixelType;
const ScalarPixelType pixelTypeSource = imageIOsource->
GetComponentType();
The IOComponentType is actually an "enum".
A type for which we have not consider it to be used as a valid image type.
Note that what GetComponentType() is returning is not a "pixel type",
but a "number" that refers to a "pixel type". That is, it is just a label
that enumerates the potential expected pixel types.
The DefaultConvertPixelTraits, compilation error, in
itk::DefaultConvertPixelTraits<PixelType>::ComponentType
happens because we have a set of traits defined for the expected
pixel types, common types such as : char, int, float....etc.
Not so for the IOComponentType enum.
That is, the compiler is complaining about the use of
itk::DefaultConvertPixelTraits< IOComponentType >
because it was expecting something like:
itk::DefaultConvertPixelTraits< char >
itk::DefaultConvertPixelTraits< short >
itk::DefaultConvertPixelTraits< float >
...
etc
For a full list of the expected types, please see:
ITK/Modules/Core/Common/include/itkDefaultConvertPixelTraits.h
https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Core/Common/include/itkDefaultConvertPixelTraits.h#L67
67 #define ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(type)
...
and
https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Core/Common/include/itkDefaultConvertPixelTraits.h#L95
95 ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(float)
96 ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(double)
97 ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(int)
98 ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(char)
99 ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(short)
100 ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(unsigned int)
101 ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(signed char)
102 ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(unsigned char)
103 ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(unsigned short)
104 ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(long)
105 ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(unsigned long)
106 ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(long long)
107 ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(unsigned long long)
108 ITK_DEFAULTCONVERTTRAITS_NATIVE_SPECIAL(bool)
The way that the IOComponentTyep enum is expected to be used, is not by
taking it directly as the pixel template type argument of an itk::Image<>,
but as the driving variable of a Switch() statement.
Something like:
switch( imageIOSource->GetComponentType() )
{
case UCHAR:
{
typedef itk::Image< unsigned char, 3 > ImageType;
... etc...
break;
}
case CHAR:
{
typedef itk::Image< char, 3 > ImageType;
... etc...
break;
}
case UINT:
{
typedef itk::Image< unsigned int, 3 > ImageType;
... etc...
break;
}
...etc...
}
Regards,
Luis
On Fri, Jan 10, 2014 at 1:34 AM, Massinissa Bandou <
Massinissa.Bandou at usherbrooke.ca> wrote:
> Hi Dženan Zukić,
>
> I just want to know what's wrong with the code below because I have 5
> errors:
>
>
> Error 2 error C2146: syntax error : missing ';' before identifier
> 'ComponentType' c:\program
> files\itk\include\itk-4.4\itkDefaultConvertPixelTraits.h 45 1
> TomoRegistration
> Error 4 error C2602:
> 'itk::DefaultConvertPixelTraits<PixelType>::ComponentType' is not a member
> of a base class of 'itk::DefaultConvertPixelTraits<PixelType>' c:\program
> files\itk\include\itk-4.4\itkDefaultConvertPixelTraits.h 45 1
> TomoRegistration
> Error 1 error C2838: 'ComponentType' : illegal qualified name in
> member
> declaration c:\program
> files\itk\include\itk-4.4\itkDefaultConvertPixelTraits.h 45 1
> TomoRegistration
> Error 5 error C2868:
> 'itk::DefaultConvertPixelTraits<PixelType>::ComponentType' : illegal syntax
> for using-declaration; expected qualified-name c:\program
> files\itk\include\itk-4.4\itkDefaultConvertPixelTraits.h 45 1
> TomoRegistration
> Error 3 error C4430: missing type specifier - int assumed. Note:
> C++ does
> not support default-int c:\program
> files\itk\include\itk-4.4\itkDefaultConvertPixelTraits.h 45 1
> TomoRegistration
>
>
>
>
> typedef itk::ImageIOBase::IOComponentType ScalarPixelType;
> itk::ImageIOBase::Pointer imageIOsource =
>
> itk::ImageIOFactory::CreateImageIO("writesource.mhd",itk::ImageIOFactory::ReadMode);
> imageIOsource->SetFileName("writesource.mhd");
> imageIOsource->ReadImageInformation();
> const ScalarPixelType pixelTypeSource =
> imageIOsource->GetComponentType();
>
> itk::ImageIOBase::Pointer imageIOtarget =
>
> itk::ImageIOFactory::CreateImageIO("writetarget.mhd",itk::ImageIOFactory::ReadMode);
> imageIOtarget->SetFileName("writetarget.mhd");
> imageIOtarget->ReadImageInformation();
> const ScalarPixelType pixelTypeTarget =
> imageIOtarget->GetComponentType();
>
> myClass* a= new myClass;
> a->VolumeRegistration(pixelTypeSource,pixelTypeTarget);
>
> class myClass
> {
> ....
> template<typename pixelType1, typename pixelType2>
> void VolumeRegistration(pixelType1,pixelType2)
> {
> typedef itk::Image< pixelType1, 3 > FixedImageType;
> typedef itk::Image< pixelType2, 3 > MovingImageType;
> }
> };
>
>
>
>
> --
> View this message in context:
> http://itk-users.7.n7.nabble.com/newbie-C-question-tp33081p33162.html
> Sent from the ITK - Users mailing list archive at Nabble.com.
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