Powerpoint application and pdf export

HI,

I try to export a powerpoint file in pdf with the ExportAsFixedFormat method

QAxObject *officeApplication = new QAxObject("Powerpoint.Application");

QAxObject *document = documents->querySubObject("Open(const QString&, bool)", myPPFile, true);

document->querySubObject("ExportAsFixedFormat(QString, PpFixedFormatType)", outputPathWindows, "ppFixedFormatTypePDF");

The output response is :

QAxBase: Error calling IDispatch member ExportAsFixedFormat: Type mismatch in parameter 1

I have print out all the methodSignature() and for  {{ExportAsFixedFormat,}}the output gives :

"ExportAsFixedFormat(QString,PpFixedFormatType)"

The same call of ExportAsFixedFormat works with Word and Excel.

if (application == "Word.Application")
        document->querySubObject("ExportAsFixedFormat(QString, WdExportFormat)", outputPathWindows, "wdExportFormatPDF");

    if (application == "Excel.Application")
        document->querySubObject("ExportAsFixedFormat(XlFixedFormatType, QString)", "xlTypePDF", outputPathWindows);

I don't know if it is a bug or something I'm doing wrong.

Sincerely