QT how to take enum object inside the QList and print accordingly ?

amarism

I have a header file. inside i will declare the enum class like :

class demo {
     enum {a,b,c,d};
}

and i have a demo.cpp file and i need to print the enum value. When inside the enum class i have only for string then i will decalre inside the .cpp like

char const * string[]={"a","b","c","d"}

If i have more 1000 object there inside the enum then how will I call and print all value inside demo.cpp file. I viewed many option but I am not satisfied with answer. If some give answer its very useful for me. Thank you in advance

raven-worx

@amarism

inside a Q_OBJECT, Q_GADGET or Q_NAMESPACE:

enum MyEnum {
     a,
     ....
     zzz9999
};
Q_ENUM(MyEnum)

then use QMetaEnum to get values or values-to-strings, etc...

QMetaEnum e = QMetaEnum::fromType<MyEnum>();
qDebug() << e.valueToKey(MyEnum::zzz9999);

amarism

@raven-worx I am getting error when i select the Q_ENUM() below the enum. and my enum is there inside the "namespace"

raven-worx

@amarism
show some code

amarism

@raven-worx this on my .h file

  namespace DC
  {
      enum EnumType {
      FileMetaInformationGroupLength          = 0x00020000,
      FileMetaInformationVersion              = 0x00020001,
      MediaStorageSOPClassUID                 = 0x00020002,
      MediaStorageSOPInstanceUID              = 0x00020003
      .......... 5000
      };
   Q_ENUM(EnumType);
}

and I am reading the file staticlly here in .cpp file

QString readFile::SetTagNames(QStandardItemModel *model)
{

char *DisplayTags[] = { " FileMetaInformationGroupLength ", "FileMetaInformationVersion", "MediaStorageSOPClassUID"             
                                                , "MediaStorageSOPInstanceUID", "ImplementationClassUID"};

for (int i = 0; i < total ; i++)
{
	model->setData(model->index(i, 0), DisplayTags[i]);
}
return QString();
}

reading respective date through

model->setData(model->index(0, 1), pMetaData->GetAttributeValue(DC::FileMetaInformationGroupLength ).GetCharData());
	model->setData(model->index(1, 1), pMetaData->GetAttributeValue(DC::FileMetaInformationVersion).GetCharData());
	model->setData(model->index(2, 1), pMetaData->GetAttributeValue(DC::MediaStorageSOPClassUID).GetCharData());
	model->setData(model->index(3, 1), pMetaData->GetAttributeValue(DC::MediaStorageSOPInstanceUID).GetCharData());

raven-worx

@amarism said in QT how to take enum object inside the QList and print accordingly ?:

namespace DC
{
enum EnumType {
FileMetaInformationGroupLength = 0x00020000,
FileMetaInformationVersion = 0x00020001,
MediaStorageSOPClassUID = 0x00020002,
MediaStorageSOPInstanceUID = 0x00020003
.......... 5000
};
Q_ENUM(EnumType);
}

as i mentioned you should use Q_NAMESPACE!

namespace DC {
     Q_NAMESPACE
     ...
}

amarism

@raven-worx i will take one example in QT.

enum data{
        a,b,c,d
    };
Q_ENUM(data)

and .cpp file

 QMetaEnum e = QMetaEnum::fromType<data>();
  for(int i=0;i<=d;i++){
    qDebug()<<e.valueToKey(data::a);
 }

It will print only d(4times). But I want to print a,b,c,d

raven-worx

@amarism said in QT how to take enum object inside the QList and print accordingly ?:

qDebug()<<e.valueToKey(data::a);

it rather prints 4 times the value of data::a since you tell it to do so: qDebug()<<e.valueToKey(data::a);

JonB

@amarism

  for(int i=0;i<=d;i++){
    qDebug()<<e.valueToKey(data::a);
 }

Like @raven-worx says; you probably want to access that i loop counter inside the loop, don't you? :)

amarism

This post is deleted!

J.Hilk

@amarism

for(int i=0;i<=d;i++){
    qDebug()<<e.valueToKey(static_cast<data>(i));
 }

raven-worx

@amarism said in QT how to take enum object inside the QList and print accordingly ?:

i tried to take i inside the loop but its show error " 'i': illegal qualified name in member declaration "

QMetaEnum::valueToKey() takes an int parameter, so i don't see why the following shouldn't work.

for(int i=0;i<=d;i++){
    qDebug() << e.valueToKey(i);
 }

amarism

@raven-worx ya its working , Thanks a lots

amarism

@J.Hilk Without QT, Can I do the same thing(by using the normal C++ method like a 2-D array) ??