IAttachmentExecute 接口 (shobjidl_core.h)

公开使用客户端应用程序提供用户环境的方法，该环境通过电子邮件和消息附件提供文件的安全下载和交换。

继承

IAttachmentExecute 接口继承自 IUnknown 接口。 IAttachmentExecute 还具有以下类型的成员：

方法

IAttachmentExecute 接口包含以下方法。

IAttachmentExecute：：CheckPolicy 提供布尔测试，可用于根据附件的执行策略做出决策。
IAttachmentExecute：：ClearClientState 删除基于客户端 GUID 的任何存储状态。 例如，基于复选框的设置可能指示不应再次显示特定文件类型的提示。
IAttachmentExecute：：Execute 对附件执行操作。
IAttachmentExecute：:P rompt 向用户显示提示 UI。
IAttachmentExecute：：Save 保存附件。
IAttachmentExecute：：SaveWithUI 如果保存操作失败，则向用户显示解释性错误 UI。
IAttachmentExecute：：SetClientGuid 指定并存储客户端的 GUID。
IAttachmentExecute：：SetClientTitle 指定并存储提示窗口的标题。
IAttachmentExecute：：SetFileName 指定并存储文件的建议名称。
IAttachmentExecute：：SetLocalPath 设置并存储文件的路径。
IAttachmentExecute：：SetReferrer 根据引用文件设置与附件文件关联的安全区域。
IAttachmentExecute：：SetSource 设置文件传输源的备用路径或 URL。

注解

此接口假定以下内容：

• 客户端具有附件支持和行为的策略或设置。
• 客户端与用户交互。

此接口的 IID IID_IAttachmentExecute。

下面是电子邮件客户端如何使用 IAttachmentExecute 的示例。

// 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;
}

要求

最低受支持的客户端	Windows XP SP2 [仅限桌面应用]
最低受支持的服务器	Windows Server 2003 [仅限桌面应用]
目标平台	Windows
标头	shobjidl_core.h