Re: How to write htis code using IFileOperation in Vista

Hi,

I would use code something like this (I need to better test that, however):

If you don't want to be distracted from COM error checking, these are some
steps (also outlined by comments in source code):

Convert from TCHAR to wchar_t
because IFileOperation::DeleteItem works only
with Unicode UTF-16 strings.

Initialize COM engine

Create COM instance of IFileOperation

Set parameters for current operation

Create IShellItem instance associated to file to delete

Declare this shell item (file) to be deleted

Perform the deleting operation

Cleanup COM

I called the function DeletFileWithIFO to disambiguate from DeleteFile.
(IFO = IFileOperation COM interface)

<code>

//=======================================================================
//
// Deletes a file given its name (with full path).
//
// Uses new Vista IFileOperation COM interface
// (works in both ANSI/MBCS and Unicode builds, thanks to internal
// string conversion).
//
// Check HRESULT return value to see if operation was successful
// (SUCCEEDED( DeleteFile(...) )).
//
//=======================================================================
HRESULT DeleteFileWithIFO( LPCTSTR szFilename )
{
    //
    // Check input parameter
    //
    ASSERT( szFilename != NULL );
    if ( szFilename == NULL )
        return E_POINTER;

    //
    // Convert from TCHAR to wchar_t
    // because IFileOperation::DeleteItem works only
    // with Unicode UTF-16 strings.
    //
    CT2W wszFileToDelete( szFilename );

    //
    // Initialize COM engine
    //
    HRESULT hr = CoInitializeEx(NULL,
        COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);

    if (SUCCEEDED(hr))
    {
        //
        // Create COM instance of IFileOperation
        //
        IFileOperation *pfo = NULL;
        hr = CoCreateInstance(CLSID_FileOperation, NULL,
            CLSCTX_ALL, IID_PPV_ARGS(&pfo));

        if (SUCCEEDED(hr))
        {
            //
            // Set parameters for current operation
            //
            hr = pfo->SetOperationFlags(
                FOF_SILENT | // do not display progress dialog-box
                FOF_NOERRORUI // do not display error message to the user
            );

            if (SUCCEEDED(hr))
            {
                //
                // Create IShellItem instance associated to file to delete
                //
                IShellItem *psiFileToDelete = NULL;
                hr = SHCreateItemFromParsingName(
                    wszFileToDelete, NULL,
                    IID_PPV_ARGS(&psiFileToDelete));

                if (SUCCEEDED(hr))
                {
                    //
                    // Declare this shell item (file) to be deleted
                    //
                    hr = pfo->DeleteItem( psiFileToDelete, NULL );
                }

                // Cleanup file-to-delete shell item
                psiFileToDelete->Release();
                psiFileToDelete = NULL;

            }

            if (SUCCEEDED(hr))
            {
                //
                // Perform the deleting operation
                //
                hr = pfo->PerformOperations();
            }
        }

        // Cleanup file operation object
        pfo->Release();
        pfo = NULL;
    }

    //
    // Cleanup COM
    //
    CoUninitialize();

    //
    // Return operation result
    //
    return hr;
}
</code>

HTH,
Giovanni

"Mustanseer M S" <MustanseerMS@discussions.microsoft.com> ha scritto nel
messaggio news:8B64DCAA-F1E8-46BE-A645-3A6588A6423A@microsoft.com...