如何重命名WPD设备上的对象

Question

我正在制作PortableDeviceLib的分支，它与WPD/MTP设备上的存储服务一起工作。偶然发现了一个问题。我想重命名一个设备上的文件对象，所以首先想到的是改变对象的WPD_OBJECT_ORIGINAL_FILE_NAME属性。但是这样做会得到一个异常。如果我更改WPD_OBJECT_NAME，名称会更改，但文件名与预期相同，并且没有例外。

问题是，如何在WPD设备上重命名对象?为什么我得到异常更改文件名属性?

我想重命名的原因是，当将文件复制到设备时，如果文件已经存在，它会获得扩展名为dup0, dup1等的副本

Answer 1

这是一个老的响应，但是…
下面是我用来在WPD设备上重命名对象的代码:

__declspec(dllexport) HRESULT __cdecl supportsCommand( CComPtr<IPortableDevice>& device, PROPERTYKEY theKey ) {
    HRESULT err = S_OK;
    CComPtr<IPortableDeviceCapabilities> capabilities;
    CComPtr<IPortableDeviceKeyCollection> commands;
    uint numCommands = 0;
    device->Capabilities( &capabilities );
    err = capabilities->GetSupportedCommands( &commands );
    err = commands->GetCount( &numCommands );
    PROPERTYKEY key = WPD_PROPERTY_NULL;
    for( uint index = 0; index < numCommands; index++) {
        err = commands->GetAt( index, &key );
        if( IsEqualPropertyKey(theKey, key) )
            return true;
    }
    return false;
}
__declspec(dllexport) HRESULT __cdecl renameObject( CComPtr<IPortableDevice>& device, LPWCSTR objectId, LPWCSTR newName ) {
    HRESULT err = S_OK;
    if (supportsCommand(device, WPD_COMMAND_OBJECT_PROPERTIES_SET) == false)
        return (HRESULT)-1;
    CComPtr<IPortableDeviceValues> properties, values, results;
    err = CoCreateInstance( CLSID_PortableDeviceValues, NULL, CLSCTX_INPROC_SERVER, IID_IPortableDeviceValues, (VOID**) &properties );
    err = CoCreateInstance( CLSID_PortableDeviceValues, NULL, CLSCTX_INPROC_SERVER, IID_IPortableDeviceValues, (VOID**) &values );<br>
    // Mount the command.
    err = properties->SetGuidValue( WPD_PROPERTY_COMMON_COMMAND_CATEGORY
        , WPD_COMMAND_OBJECT_PROPERTIES_SET.fmtid );
    err = properties->SetUnsignedIntegerValue( WPD_PROPERTY_COMMON_COMMAND_ID
        , WPD_COMMAND_OBJECT_PROPERTIES_SET.pid );<br>
    // Set the values
    err = properties->SetStringValue( WPD_PROPERTY_OBJECT_PROPERTIES_OBJECT_ID, objectId );
    err = values->SetStringValue( WPD_OBJECT_ORIGINAL_FILE_NAME, newName );
    err = properties->SetIPortableDeviceValuesValue( WPD_PROPERTY_OBJECT_PROPERTIES_PROPERTY_VALUES, values );
    err = device->SendCommand( 0, properties, &results );<br>
    // Show the results
    uint count = 0;
    results->GetCount( &count );
    PROPERTYKEY key;
    PROPVARIANT var;
    for( uint i = 0; i < count; i++ ) {
        results->GetAt( i, &key, &var );
        // ...show key and var...
    }
    return err;
}