How with using ActiveQT to merge cells in Excell

[sawerset]

I have connected to Excell with ActiveQT.
I need to merge several Cells. I know only numerical coordinates of cells range like (5,5) (10,10)
tried this

QAxObject* ExcelCell=ExcelCells->querySubObject("Range(Cells(int,int),Cells(int,int))",5,5,10,10);
ExcelCell->dynamicCall("Merge");

QAxObject* ExcelCell=ExcelCells->querySubObject("Range(Cells(int,int),Cells(int,int))",5,5,10,10);
ExcelCell->dynamicCall("Merge");

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but this does not work.
What is the right way?
Please show me the sample please.