IAMOpenProgress::QueryProgress method (strmif.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The QueryProgress method retrieves the progress of the file-open operation.
Syntax
HRESULT QueryProgress(
[out] LONGLONG *pllTotal,
[out] LONGLONG *pllCurrent
);
Parameters
[out] pllTotal
Pointer to a variable that receives the length of the entire file, in bytes.
[out] pllCurrent
Pointer to a variable that receives the length of the downloaded portion of the file, in bytes.
Return value
Returns an HRESULT value. Possible values include those shown in the following table.
| Return code | Description |
|---|---|
|
Success. |
|
The returned values are estimates. |
|
Unexpected error. |
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | strmif.h (include Dshow.h) |
| Library | Strmiids.lib |