save file selected PATH IN TEXT BOX by clicking button

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C++

MFC

Hi i need to know how in MFC Dialouge based
i can save file by selecting path on clicking button as

if(fileDlg.DoModal() == IDOK)
{
	std::ofstream file;
	file.open(fileDlg.GetFileName(),std::ios::out);
	if (file !=  NULL)
	{
		file << (*assembly);
		file.close();
	}
}

here fileDlg.GetFileName used what to do do i can save my file at selected path
after selecting path and given file name in dialouge Save button not apper ioen button appear Regards