🚀 go-pugleaf

Hi Sara,
> How can I know which type of Microsoft Office Document before openning ?

You might try accessing the document's Application Name property from its
Summary property set; this technique is described in MSDN Q186898...

http://support.microsoft.com/default.aspx?scid=kb%3ben-us%3b186898

Here's a rough code example; the function will return a string that contains
"Microsoft Word", "Microsoft Excel", etc...

#include <ole2.h>
AnsiString GetCmpdDocumentApp(
   WideString filename
  )
{
  // will hold the document's application name
  AnsiString AppName;

  // open the compound document
  IStorage* pStorage = NULL;
  HRESULT hRes = StgOpenStorage(
    filename.c_bstr(), NULL, STGM_READ |
    STGM_SHARE_EXCLUSIVE, NULL, 0, &pStorage
    );
  if (FAILED(hRes))
  {
    throw EWin32Error("Cannot open compound document.");
  }
  
  try // acess the document's property set
  {
    IPropertySetStorage* pPropSet;
    hRes = pStorage->QueryInterface(
      IID_IPropertySetStorage,
      reinterpret_cast<void**>(&pPropSet)
      );
    if(FAILED(hRes))
    {
      throw EWin32Error("Cannot access property set.");
    }
    
    try // access the Summary properties
    {
      IPropertyStorage* pProp;
      hRes = pPropSet->Open(
        FMTID_SummaryInformation, STGM_READ |
        STGM_SHARE_EXCLUSIVE, &pProp
        );
      if(FAILED(hRes))
      {
        throw EWin32Error("Cannot access summary properties.");
      }

      try // read the Application Name property
      {
        // specify the property to retrieve
        PROPSPEC prop_spec;
        std::memset(&prop_spec, 0, sizeof(PROPSPEC));
        prop_spec.ulKind = PRSPEC_PROPID;
        prop_spec.propid = PIDSI_APPNAME; // application name

        // read the property
        PROPVARIANT prop_var;
        hRes = pProp->ReadMultiple(1, &prop_spec, &prop_var);
        if (FAILED(hRes))
        {
          throw EWin32Error("Error reading AppName property.");
        }
        
        // copy the application name
        AppName = prop_var.pszVal;

        // clean up
        pProp->Release();
      }
      catch (...)
      {
        // clean up
        pProp->Release();
        throw;
      }
      // clean up
      pPropSet->Release();
    }
    catch (...)
    {
      // clean up
      pPropSet->Release();
      throw;
    }
    // clean up
    pStorage->Release();
  }
  catch (...)
  {
    // clean up
    pStorage->Release();
    throw;
  }

  // return the retrieved application name
  return AppName;

  // NOTE: You should consider using a smart COM-pointer class 
  // to eliminate all the exception handling in this code.
}

Good luck,
-- 
Damon (TeamB)
BCBCAQ--http://bcbcaq.bytamin-c.com