IUISimplePropertySet::GetValue 方法 (uiribbon.h)

检索由属性键标识的值。

语法

HRESULT GetValue(
  [in]  REFPROPERTYKEY key,
  [out] PROPVARIANT    *value
);

参数

[in] key

类型: REFPROPERTYKEY

感兴趣的 属性键

[out] value

类型: PROPVARIANT*

此方法返回时,包含指向 值的指针。

返回值

类型: HRESULT

如果该方法成功,则返回 S_OK。 否则,将返回 HRESULT 错误代码。

注解

示例

以下示例演示项库和 Command 库的 IUISimplePropertySet 的自定义实现。

此示例中的 CItemProperties 类派生自 IUISimplePropertySet ,除了所需的方法 IUISimplePropertySet::GetValue 外,还实现了一组用于初始化和索引跟踪的帮助程序函数。

//
//  PURPOSE:    Implementation of IUISimplePropertySet.
//
//  COMMENTS:
//              Three gallery-specific helper functions added. 
//

class CItemProperties
  : public CComObjectRootEx<CComMultiThreadModel>
  , public IUISimplePropertySet
{
  public:

  // COM map for QueryInterface of IUISimplePropertySet.
  BEGIN_COM_MAP(CItemProperties)
    COM_INTERFACE_ENTRY(IUISimplePropertySet)
  END_COM_MAP()

  // Required method that enables property key values to be 
  // retrieved on gallery collection items.
  STDMETHOD(GetValue)(REFPROPERTYKEY key, PROPVARIANT *ppropvar)
  {
    HRESULT hr;

    // A Command gallery.
		  // _isCommandGallery set on item initialization.
    if (_isCommandGallery)
    {			
      if(key == UI_PKEY_CommandId && _isCommandGallery)
      {
			     // Return a pointer to the CommandId of the item.
        return InitPropVariantFromUInt32(_cmdID, ppropvar);
      }			
    }
    // An item gallery.
    else
    {
      if (key == UI_PKEY_Label)
      {
        // Return a pointer to the item label string.
        return UIInitPropertyFromString(
                 UI_PKEY_Label, g_labels[_index], ppropvar);
      }
      else if(key == UI_PKEY_ItemImage)
      {
        if (NULL == _spimgItem)
        {
          hr = CreateUIImageFromBitmapResource(
                 MAKEINTRESOURCE(IDB_GALLERYITEM), &_spimgItem);
          if (FAILED(hr))
          {
            return hr;
          }
        }
        // Return a pointer to the item image.
        return UIInitPropertyFromImage(
                 UI_PKEY_ItemImage, _spimgItem, ppropvar);
      }			
    }
    return E_NOTIMPL;
  }

  // Initialize an item in an item gallery collection at the specified index.
  void Initialize(int index)
  {
    _index = index;
    _cmdID = 0;
    _isCommandGallery = false;
  }

  // Initialize a Command in a Command gallery.
  void InitializeAsCommand(__in UINT cmdID)
  {
    _index = 0;
    _cmdID = cmdID;
    _isCommandGallery = true;
  }

  // Gets the index of the selected item in an item gallery.
  int GetIndex()
  {
    return _index;
  }

private:
  int _index;
  int _cmdID;
  bool _isCommandGallery;
  CComPtr<IUIImage> _spimgItem;	
};

要求

要求
最低受支持的客户端 Windows 7 [仅限桌面应用]
最低受支持的服务器 Windows Server 2008 R2 [仅限桌面应用]
目标平台 Windows
标头 uiribbon.h
DLL Mshtml.dll

另请参阅

IUISimplePropertySet

属性键

Windows 功能区框架示例