Class has no metaobject information?

feedmeqt

Hi,

I've created a singleton class(dll ), plain dll and another COM dll in QT(non GUI, all derving from QObject & Q_OBJECT also added). Now, When I'm accessing the singleton class/plain dll methods inside the COM dll, an error pops up "Class has no metaobject information?" . I don't understand the meaning of it. I'm using VS2010 and QT4.7.4.

After searching for information regarding this error in qtfroum , i found some similar topic "here":http://developer.qt.nokia.com/forums/viewthread/10836 , But, cmdline i've not tried and expecting some solution might be there.

Totally stuck here!!! :(. Need some direction.

giesbert

From what you write, it's hard to say where the problem is.
First of all, I asume you are on windows (COM :-) ).
Which compiler tool chain do you use?
How do your classes (especially the exported ones) look like?

feedmeqt

Ok, I've tried from CMDLine its working. But like to know the root cause for it.
Here is my class interface,

@
// COM dll (no UI component)
#include <ActiveQt/QAxBindable>

#include "classM.h"
#include "classA_global.h"

#include <qobject.h>
#include <QMetaObject>

struct key {

int someVar;
};

// ,
class CLASSA_EXPORT classA : public QObject, public QAxBindable , public scanner
{
Q_OBJECT
public:
classA( QObject p = 0);
STDMETHOD(Init)(LPTNTDRVINFO pDrvInfo); // 3rd part "scanner" virtual function
ULONG STDMETHODCALLTYPE AddRef( void);
ULONG STDMETHODCALLTYPE Release( void);
STDMETHOD(QueryInterface)(
/ [in] / REFIID riid,
/ [iid_is][out] */ __RPC__deref_out void __RPC_FAR *__RPC_FAR *ppvObject);

public slots:
QString getSaampleData();
private:
//bla bla bla...
};

QAXFACTORY_DEFAULT(classA,
"{20C63A76-5FEF-49C8-8E83-26957590748B}",
"{BE690126-A3413-47D1-A278-1E69FCD1B61E}",
"{0DED1E03-D4F2-44C3-8B67-56F4D7D87661}",
"{5263E150-F234-4AE0-9E38-CBE753E936C0}",
"{96AB3485-1234-4B60-BB62-5C77C22EF154}")

// singleton class interface. dll
#include <QObject>
#include<QVariant>
#include <QList>
#include <QMetaObject>
#include "singleton_global.h"
#include <qDebug.h>

class SINGLETON_EXPORT singleton : public QObject
{

Q_OBJECT

static bool instanceFlag;
static singleton single;
singleton();
singleton(const singleton&);
public:
static singleton getInstance();
~singleton();
QMap<QString, struct key*> getMapVar();

private:
QMap<QString, struct key*> MapVar;

};

// implementation of CLASSA(COM object).

QString ClassA::getSaampleData(){

QMap<QString, struct key*> tempMapVar;
tempMapVar = singleton::getInstance()->getMapVar(); // gives error while building , class do not have metaobject...

}

// console application

main() {

ClassALib::IClassPtr obj;
HRESULT hr = CoInitialize(NULL);
if (FAILED(hr))
{
#if _DEBUG
qDebug("CoInitialize Failed");
#endif
return -1;
}

obj.CreateInstance("{20C63A76-5FEF-49C8-8E83-26957590748B}");
if(!obj) {
return -1;
}
obj->getSaampleData();

}
@

This is how my interface looks like,

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Class has no metaobject information?