When application runs as service in WInServer 2012, printing fails

Question

spCommand->Exec( &CGID_MSHTML, IDM_PRINT, OLECMDEXECOPT_DONTPROMPTUSER,    NULL,   NULL); returns S_OK but printing is not happening.
SplWOW64.exe gets launched but DllHost.exe fails to get launched.
Please provide any hint to solve this issue on WInSvr2012.
Thanks
--Sumit Saxena

Answer 1

#include "stdafx.h"
#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#include <docobj.h>
#import <shdocvw.dll>
int _tmain(int argc, _TCHAR* argv[])
    ::OleInitialize(NULL);
    try
        SHDocVw::IWebBrowserAppPtr ptrWebBrowserApp(
            __uuidof(SHDocVw::InternetExplorer));
        SHDocVw::IWebBrowser2Ptr ptrWebBrowser =
            ptrWebBrowserApp;
        _variant_t vtDummy;
        HRESULT hr;
        hr = ptrWebBrowser->Navigate(
            L"C:\\Users\\Rahul\\Desktop\\sample.txt",
            &vtDummy, &vtDummy, &vtDummy, &vtDummy);
        while(ptrWebBrowser->Busy == VARIANT_TRUE)
            ::Sleep(3000);
        IOleCommandTargetPtr ptrOleCmdTarget =
            ptrWebBrowser->Document;
        hr = ptrOleCmdTarget->Exec(NULL, OLECMDID_PRINT,
            OLECMDEXECOPT_DONTPROMPTUSER, NULL, NULL);
    catch(_com_error& e)
        _ftprintf(stderr,
            _T("Error: 0x%08X (%s); Source: %ls; Desc: %ls"),
            e.Error(), e.ErrorMessage(),
            LPCWSTR(e.Source()), LPCWSTR(e.Description())
    ::OleUninitialize();
    return 0;
This code segment gets executed through one of the service.