文件操作进度对话框

Question

Windows provides standard component - progress dialog. It was invented in Windows XP. Progress dialog can be created via CoCreateInstance call with interface IProgressDialog. Windows Vista provides another (new) UI for progress dialog. One need to create progress dialog with interface IOperationsProgressDialog to get new UI. There is the one component (CLSID_ProgressDialog): it supports both interfaces and UIs. IOperationsProgressDialog interface is recommended to use.

I've developed namespace extension. it supports drag & drop. I use scenario to transfer data from my NSE:

• IShellFolder::GetUIObjectOf -> IDataObject
• IDataObject::GetData -> FILEDESCRIPTOR, FILECONTENTS
• FILECONTENTS -> IStream
• IStream::Read -> data to transfer

FILEDESCRIPTOR reports that my NSE requires progress UI (FD_PROGRESSUI). Progress dialog is shown while files are copied. This progress dialog has UI which is provided by IProgressDialog interface. I need explorer to use progress dialog with IOperationsProgressDialog's UI but I don't know how to force explorer do it. I provide IDataObject and IStream only. NSE is designed for Windows 7 but progress dialog has old UI. How can I get new progress dialog UI during copying from my NSE to explorer?

Answer 1

您可以QueryInterface所提供的对象是否也实现IOperationsProgressDialog ，但是您应该准备处理E_NOINTERFACE 。