I am new in QT. I want create a .msg file programmatically in QT.I want to create a Qt gui application with MS Outlook integration.After searching from various web resources,I got a bit of source code but its not working properly.Its contain some errors and conversion problems.

Qt Code: 
  1. #include "mainwindow.h"
  2. #include<QDebug>
  3. #include<QFile>
  4. #include <MAPIX.h>
  5. #include <MAPITags.h>
  6. #include <MAPIDefS.h>
  7. #include <MAPIUtil.h>
  8. #include <MAPIGuid.h>
  9. #include <IMessage.h>
  10. #include <ObjBase.h>
  11. #include<QDir>
  12.  
  13.  
  14. #define INITGUID
  15. #define USES_IID_IMessage
  16.  
  17. MainWindow::MainWindow(QWidget *parent)
  18.     : QMainWindow(parent)
  19. {
  20.     LPMESSAGE asdfasd = NULL;
  21.     qDebug()<<"Sample msg File Open";
  22.     SaveToMSG(asdfasd);
  23.  
  24. }
  25.  
  26. MainWindow::~MainWindow()
  27. {
  28.  
  29. }
  30. HRESULT MainWindow::SaveToMSG(LPMESSAGE pMessage)
  31. {
  32.     HRESULT hRes = S_OK;
  33.        LPSPropValue pSubject = NULL;
  34.        LPSTORAGE pStorage = NULL;
  35.        LPMSGSESS pMsgSession =  NULL;
  36.        LPMESSAGE pIMsg = NULL;
  37.        SizedSPropTagArray ( 7, excludeTags );
  38.        char szPath[_MAX_PATH];
  39.        char strAttachmentFile[_MAX_PATH];
  40.        LPWSTR lpWideCharStr = NULL;
  41.        ULONG cbStrSize = 0L;
  42.  
  43.        // create the file name in the directory where "TMP" is defined
  44.        // with subject as the filename and ".msg" extension.
  45.  
  46.        // get temp file directory
  47.        GetTempPath(_MAX_PATH, szPath);
  48.  
  49.        // get subject line of message to copy. This will be used as the
  50.        // new file name.
  51.        HrGetOneProp( pMessage, PR_SUBJECT, &pSubject );
  52.  
  53.        // fuse path, subject, and suffix into one string
  54.        strcpy ( strAttachmentFile, szPath );
  55.        strcat ( strAttachmentFile, pSubject->Value.lpszA  );
  56.        strcat ( strAttachmentFile, ".msg");
  57.  
  58.        // get memory allocation function
  59.        LPMALLOC pMalloc = MAPIGetDefaultMalloc();
  60.  
  61.        // Convert new file name to WideChar
  62.        cbStrSize = MultiByteToWideChar (CP_ACP,
  63.                                         MB_PRECOMPOSED,
  64.                                         strAttachmentFile,
  65.                                         -1, lpWideCharStr, 0);
  66.  
  67.        MAPIAllocateBuffer ( cbStrSize * sizeof(WCHAR),
  68.                                (LPVOID *)&lpWideCharStr );
  69.  
  70.        MultiByteToWideChar (CP_ACP,
  71.                             MB_PRECOMPOSED,
  72.                             strAttachmentFile,
  73.                             -1, lpWideCharStr, cbStrSize );
  74.  
  75.        // create compound file
  76.        hRes = ::StgCreateDocfile(lpWideCharStr,
  77.                                  STGM_READWRITE |
  78.                                  STGM_TRANSACTED |
  79.                                  STGM_CREATE, 0, &pStorage);
  80.  
  81.        // Open an IMessage session.
  82.        hRes = ::OpenIMsgSession(pMalloc, 0, &pMsgSession);
  83.  
  84.        // Open an IMessage interface on an IStorage object
  85.        hRes = ::OpenIMsgOnIStg(pMsgSession,
  86.                                MAPIAllocateBuffer,
  87.                                MAPIAllocateMore,
  88.                                MAPIFreeBuffer,
  89.                                pMalloc,
  90.                                NULL,
  91.                                pStorage,
  92.                                NULL, 0, 0, &pIMsg);
  93.  
  94.        // write the CLSID to the IStorage instance - pStorage. This will
  95.        // only work with clients that support this compound document type
  96.        // as the storage medium. If the client does not support
  97.        // CLSID_MailMessage as the compound document, you will have to use
  98.        // the CLSID that it does support.
  99.        hRes = WriteClassStg(pStorage, CLSID_MailMessage );
  100.  
  101.        // Specify properties to exclude in the copy operation. These are
  102.        // the properties that Exchange excludes to save bits and time.
  103.        // Should not be necessary to exclude these, but speeds the process
  104.        // when a lot of messages are being copied.
  105.        excludeTags.cValues = 7;
  106.        excludeTags.aulPropTag[0] = PR_ACCESS;
  107.        excludeTags.aulPropTag[1] = PR_BODY;
  108.        excludeTags.aulPropTag[2] = PR_RTF_SYNC_BODY_COUNT;
  109.        excludeTags.aulPropTag[3] = PR_RTF_SYNC_BODY_CRC;
  110.        excludeTags.aulPropTag[4] = PR_RTF_SYNC_BODY_TAG;
  111.        excludeTags.aulPropTag[5] = PR_RTF_SYNC_PREFIX_COUNT;
  112.        excludeTags.aulPropTag[6] = PR_RTF_SYNC_TRAILING_COUNT;
  113.  
  114.        // copy message properties to IMessage object opened on top of
  115.        // IStorage.
  116.        hRes = pMessage->CopyTo(0, NULL,
  117.                                (LPSPropTagArray)&excludeTags,
  118.                                NULL, NULL,
  119.                                (LPIID)&IID_IMessage,
  120.                                pIMsg, 0, NULL );
  121.  
  122.        // save changes to IMessage object.
  123.        pIMsg -> SaveChanges ( KEEP_OPEN_READWRITE );
  124.  
  125.        // save changes in storage of new doc file
  126.        hRes = pStorage -> Commit(STGC_DEFAULT);
  127.  
  128.        // free objects and clean up memory
  129.        MAPIFreeBuffer ( lpWideCharStr );
  130.        pStorage->Release();
  131.        pIMsg->Release();
  132.        CloseIMsgSession ( pMsgSession );
  133.  
  134.        pStorage = NULL;
  135.        pIMsg = NULL;
  136.        pMsgSession = NULL;
  137.        lpWideCharStr = NULL;
  138.  
  139.        return hRes;
  140. }
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so please help me to rectify these problems.