c++ - Qt ActiveX data types -

i developing c++/qt application communicates activex server. try use function returns reference array of floats parameter. function prototype is:

frequencies([in, out] safearray(float)*) 

my code is:

qlist<qvariant> variantlist; object->dynamiccall("frequencies(qlist<qvariant>&)", variantlist); 

but unfortunately have following error: type mismatch in parameter. pass array of type string or real.

after reading this document tried qlist<qstring>& , qlist<float>& no success.

the documentation of activex server says: use safearray of strings (vt_bstr) or reals (vt_r8 double or vt_r4 float).

any idea?

thanks!

http://qt-project.org/doc/qt-4.8/activeqt.html

the activeqt modules part of qt commercial edition , open source versions of qt.

http://qt-project.org/doc/qt-4.8/qaxobject.html#details

http://qt-project.org/doc/qt-4.8/qaxbase.html#details

here quote documentation qaxbase:

to call methods of com interface described following idl

dispinterface icontrol { properties:     [id(1)] bstr text;     [id(2)] ifontdisp *font;  methods:     [id(6)] void showcolumn([in] int i);     [id(3)] bool addcolumn([in] bstr t);     [id(4)] int filllist([in, out] safearray(variant) *list);     [id(5)] idispatch *item([in] int i); }; 

use qaxbase api this:

qaxobject object("<clsid>");  qstring text = object.property("text").tostring(); object.setproperty("font", qfont("times new roman", 12));  connect(this, signal(clicked(int)), &object, slot(showcolumn(int))); bool ok = object.dynamiccall("addcolumn(const qstring&)", "column 1").tobool();  qlist<qvariant> varlist; qlist<qvariant> parameters; parameters << qvariant(varlist); int n = object.dynamiccall("filllist(qlist<qvariant>&)", parameters).toint();  qaxobject *item = object.querysubitem("item(int)", 5); 

note qlist object should fill has provided element in parameter list of qvariants.

so need make sure nesting qlist, in order make safearray work.

hope helps.