ActiveQt dynamic call with a VARIANT* data type

adam3914

I am having some trouble using the dynamicCall function of a QAxObject to call a activeX function that uses the VARIANT* data type

here is the header for the ActiveX function

HRESULT ScanUSB([out] VARIANT* serialNumbers);

here is the documentation generated for the activeX function using the generateDocumentation function
void ScanUSB (QVariant& serialNumbers) [slot]

method ScanUSB

Connect a signal to this slot:

QObject::connect(sender, SIGNAL(someSignal(QVariant&)), object, SLOT(ScanUSB(QVariant&)));

Or call the function directly:

 QVariantList params = ...
 object->dynamicCall("ScanUSB(QVariant&)", params);

and here is my code

QVariant serials;
 QList<QVariant> param;
 param<<serials;
 cout<<object.dynamicCall("ScanUSB(QVariant&)",param).toInt();

the function returns with out errors, i just don't get any data back

giesbert

you try to call a method which gets a QVariant and put in a QList of QVariant. This mit be the problem. Wrap everything in a QVariant.

yougangZong

@adam3914 said in ActiveQt dynamic call with a VARIANT* data type:

I am having some trouble using the dynamicCall function of a QAxObject to call a activeX function that uses the VARIANT* data type

here is the header for the ActiveX function

@HRESULT ScanUSB([out] VARIANT* serialNumbers);
@

here is the documentation generated for the activeX function using the generateDocumentation function
@void ScanUSB (QVariant& serialNumbers) [slot]

method ScanUSB

Connect a signal to this slot:

QObject::connect(sender, SIGNAL(someSignal(QVariant&)), object, SLOT(ScanUSB(QVariant&)));

Or call the function directly:

QVariantList params = ...
object->dynamicCall("ScanUSB(QVariant&)", params);@

and here is my code

@QVariant serials;
QList<QVariant> param;
param<<serials;
cout<<object.dynamicCall("ScanUSB(QVariant&)",param).toInt()<<endl;@

the function returns with out errors, i just don't get any data back

did you solve the problem?

Eddy

Hi yougangZong ,

Do you have exactly the same ActiveX component?

What is missing in this code :

QVariant serials;//<----------------
QList<QVariant> param;
param<<serials;
cout<<object.dynamicCall("ScanUSB(QVariant&)",param).toInt()<<endl;

serials is not defined yet. So filling param with nothing.
You can also use something like:

QList<QVariant> param = {123};

Eddy