Interfaccia IAttachmentExecute (shobjidl_core.h)

Espone metodi che funzionano con le applicazioni client per presentare un ambiente utente che fornisce download e scambio sicuro di file tramite allegati di posta elettronica e messaggistica.

Ereditarietà

L'interfaccia IAttachmentExecute eredita dall'interfaccia IUnknown . IAttachmentExecute include anche questi tipi di membri:

Metodi

L'interfaccia IAttachmentExecute include questi metodi.

Commenti

Questa interfaccia presuppone quanto segue:

• Il client dispone di criteri o impostazioni per il supporto e il comportamento degli allegati.
• Il client interagisce con l'utente.

Ecco un esempio di come un client di posta elettronica può usare IAttachmentExecute.

// CClientAttachmentInfo, defined by the client, implements all the
// necessary client functionality concerning attachments. 
class CClientAttachmentInfo;  

// Creates an instance of IAttachmentExecute
HRESULT CreateAttachmentServices(IAttachmentExecute **ppae)
{
    // Assume that CoInitialize has already been called for this thread.
    HRESULT hr = CoCreateInstance(CLSID_AttachmentServices, 
                                  NULL, 
                                  CLSCTX_INPROC_SERVER, 
                                  IID_IAttachmentExecute, 
                                  (void**)&pAttachExec);

    if (SUCCEEDED(hr))
    {
        // Set the client's GUID.

        // UUID_ClientID should be created using uuidgen.exe and 
        // defined internally.
        (*ppae)->SetClientGuid(UUID_ClientID);
        
        // You also could call SetClientTitle at this point, but it is
        // not required.
    }
    return hr;
}

BOOL IsAttachmentBlocked(CClientAttachmentInfo *pinfo)
{
    // Assume that a client function has copied the file from the mail store 
    // into a temporary file.
    PWSTR pszFileName;

    // GetFileName is a method in this class for which we do not provide
    // an implementation here.
    HRESULT hr = pinfo->GetFileName(&pszFileName);
    if (SUCCEEDED(hr))
    {
        IAttachmentExecute *pExecute;

        hr = CreateAttachmentServices(&pExecute);
        if (SUCCEEDED(hr))
        {
            hr = pExecute->SetFileName(pszFileName);

            // Do not call SetLocalPath since we do not have the local path yet.
            // Do not call SetSource since email sources are not verifiable.
            // Do not call SetReferrer since we do not have a better zone 
            // than the default (Restricted sites).

            // Check for a policy regarding the file.
            if (SUCCEEDED(hr))
            {
                hr = pExecute->CheckPolicy();
            }
            pExecute->Release();
        }
        LocalFree(pszFileName);
    }
    return FAILED(hr);
}
    
HRESULT OnDoubleClickAttachment(HWND hwnd, CClientAttachmentInfo *pinfo)
{
    // Assume that a client function has copied the file from the mail store 
    // into a temporary file.
    PWSTR pszTempFile;

    // CopyToTempFile is a method in this class for which we do not provide
    // an implementation here.
    HRESULT hr = pinfo->CopyToTempFile(&pszTempFile);
    if (SUCCEEDED(hr))
    {
        IAttachmentExecute *pExecute;

        hr = CreateAttachmentServices(&pExecute);
        if (SUCCEEDED(hr))
        {
            hr = pExecute->SetLocalPath(pszTempFile);

            // Do not call SetFileName since we already have the local path.
            // Do not call SetSource since email sources are not verifiable.
            // Do not call SetReferrer since we do not have a better zone 
            // than the default (Restricted sites).

            if (SUCCEEDED(hr))
            {
                hr = pExecute->Execute(hwnd, NULL, NULL);
            }
            pExecute->Release();
        }
        LocalFree(pszTempFile);
    }
    return hr;
}

HRESULT OnSaveAttachment(HWND hwnd, CClientAttachmentInfo *pinfo)
{
    // Assume that a client function has copied the file from the mail store 
    // into a location selected by the user.
    PWSTR pszUserFile;

    // CopyToUserFile is a method in this class for which we do not provide
    // an implementation here.
    HRESULT hr = pinfo->CopyToUserFile(hwnd, &pszUserFile);
    if (SUCCEEDED(hr))
    {
        IAttachmentExecute *pExecute;

        hr = CreateAttachmentServices(&pExecute);
        if (SUCCEEDED(hr))
        {
            hr = pExecute->SetLocalPath(pszTempFile);

            // Do not call SetFileName since we have the local path.
            // Do not call SetSource since email sources are not verifiable.
            // Do not call SetReferrer since we do not have a better zone 
            // than the default (Restricted sites).

            if (SUCCEEDED(hr))
            {
                hr = pExecute->Save();
            }
            pExecute->Release();
        }
        LocalFree(pszUserFile);
    }
    return hr;
}

Requisiti