Error on writing data to DVD

Question

Hi,

From past 1 week i stuck on this please help me i am attaching code.

bool DVDBurner::Burner()
{
m_hResult = CoCreateInstance(__uuidof(MsftDiscFormat2Data), NULL, CLSCTX_INPROC_SERVER,
__uuidof(IDiscFormat2Data), (void**)&m_discFormatData);
if (!SUCCEEDED(m_hResult))
{
qDebug()<<"Unable to Initialize IDiscFormat2Data ";
return false;
}

m_hResult = CoCreateInstance(__uuidof(MsftDiscRecorder2), NULL, CLSCTX_INPROC_SERVER,
__uuidof(IDiscRecorder2), (void**)&m_discRecorder);
if (FAILED(m_hResult))
{
qDebug()<<"Unable to Initialize IDiscRecorder2 Data ";
return false;
}
BSTR           bstrDeviceName;   
HRESULT        hr = S_OK;   
BOOL           bComInitialised;   
UINT           iCounter = 0; 
LONG           lValue = 0; 
LONG   iCount;
bComInitialised = SUCCEEDED(CoInitializeEx(0, COINIT_MULTITHREADED));
// Create an object of IDiscMaster2  
if (SUCCEEDED(hr)){
    CoCreateInstance(
        CLSID_MsftDiscMaster2,
        NULL, CLSCTX_ALL,
        IID_PPV_ARGS(&discMaster)
    );   
    if(FAILED(hr)){
       qDebug()<<"\nUnsuccessful in creating an instance of CLSID_MsftDiscMaster2.\n\nError returned: 0x%x\n"<<hr;
        return 0;  }
}
 /////////////////////////// Get the number of drives/////////////////////////////// 
     if (SUCCEEDED(hr)){
        hr = discMaster->get_Count(&lValue);
        if (SUCCEEDED(hr)){
        printf("lValue %d\n\n",lValue);
        }        }

 ////////////////////////// Print all the optical drives attached to the system////
    if (SUCCEEDED(hr)){
        for(iCount = 0; iCount < lValue; iCount++) {
            hr = discMaster->get_Item(iCount, &bstrDeviceName);
            qDebug()<<"\nUnique identifier of the disc device associated with index"<<                      iCount<< bstrDeviceName;

        }             }
  m_hResult = m_discRecorder->InitializeDiscRecorder(bstrDeviceName);
if (!SUCCEEDED(m_hResult))
{
 qDebug()<<"IDiscFormat2Data->InitializeDiscRecorder Failed ";
 return false;
 }

LPCWSTR pszFile=L"D:\\Test\\output.txt";
ULONGLONG mediaSize = 0;
mediaSize=GetSizeOnDisc(pszFile);
IStream* dataStream = NULL;
if (dataStream == NULL)
 {
 SHCreateStreamOnFileEx(pszFile, 
 STGM_READ|STGM_SHARE_DENY_NONE|STGM_DELETEONRELEASE,
 FILE_ATTRIBUTE_NORMAL,
 FALSE,NULL, &dataStream);
 }
m_hResult = m_discFormatData->put_Recorder(GetInterface());
if (!SUCCEEDED(m_hResult))
{ qDebug()<<"IDiscFormat2Data->put_Recorder Failed ";return false;}
char *ansistr = "DVDBurner";
int a = lstrlenA(ansistr);
BSTR unicodestr = SysAllocStringLen(NULL, a);
::MultiByteToWideChar(CP_ACP, 0, ansistr, a, unicodestr, a);
m_hResult = m_discFormatData->put_ClientName(unicodestr);
if (FAILED(m_hResult)){qDebug()<<"Unable to put_ClientName(buf_bstr)";return false;} 
 m_hResult = m_discFormatData->Write(dataStream); // Here i am getting error  0xc0aa0403
 if (FAILED(m_hResult)){printf("Unable to m_discFormatData-  >Write::::Error:0x%08x",m_hResult); return false;} 
 discMaster->Release();
 CoUninitialize();   
 bComInitialised = FALSE;   
 return 0;   
 }
 ULONGLONG DVDBurner::GetSizeOnDisc(LPCWSTR pszFile)
 {
 CFileStatus status;
 if (CFile::GetStatus(pszFile, status))    
 {
 if (status.m_size > 0)        {            return ((status.m_size / SECTOR_SIZE) + 1) * SECTOR_SIZE;        }
  }
 return 0;
 }