HRESULT SHEmptyRecycleBin(

HWND hwnd,

LPCTSTR pszRootPath,

DWORD dwFlags

);

A handle to the parent window of any dialog boxes that might be displayed during the operation. This parameter can be NULL.（父视窗句柄。）

The address of a null-terminated string of maximum length MAX_PATH that contains the path of the root drive on which the Recycle Bin is located. This parameter can contain the address of a string formatted with the drive, folder, and subfolder names, for example c:\windows\system\, etc. It can also contain an empty string or NULL. If this value is an empty string or NULL, all Recycle Bins on all drives will be emptied.（将要清空的资源回收筒的地址，如果为NULL，则清空所有驱动器上的资源回收筒。）

One or more of the following values.

SHERB_NOCONFIRMATION

No dialog box confirming the deletion of the objects will be displayed.

SHERB_NOPROGRESSUI

No dialog box indicating the progress will be displayed.

SHERB_NOSOUND

No sound will be played when the operation is complete.（用于清空资源回收筒的功能参数。）

Returns S_OK if successful, or a COM-defined error value otherwise.