IWMEncDeviceControlPlugin::get_CurrentPosition
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The get_CurrentPosition method retrieves the current time code position on tape.
Syntax
HRESULT get_CurrentPosition(
WMTIMECODE_SAMPLE* ptimecodeSample
);
Parameters
ptimecodeSample
[out] Pointer to a member of the WMTIMECODE_SAMPLE structure specifying the time code.
Return Values
If the method succeeds, it returns S_OK. If it fails, it supports the IErrorInfo interface and returns an HRESULT error code.
| Return code | Number | Description |
| E_POINTER | 0x80004003 | The pointer to the structure is NULL. |
Example Code
// Include libraries.#include <windows.h>
#include <atlbase.h>
#include <comdef.h>
#include "C:\WMSDK\WMEncSDK9\include\wmencode.h"
#include "C:\WMSDK\WMEncSDK9\include\wmdevctl.h"
// Declare variables.
HRESULT hr;
IWMEncoder2* pEncoder;
IWMEncSource* pSrcAud;
IWMEncSource* pSrcVid;
IWMEncDeviceControlCollection* pDCColl;
IWMEncDeviceControl* pDControl;
IWMEncDeviceControlPlugin* pDCPlugin;
// Initialize the COM library and retrieve a pointer
// to an IWMEncoder interface.
hr = CoInitialize(NULL);
if ( SUCCEEDED( hr ) )
{
hr = CoCreateInstance(CLSID_WMEncoder,
NULL,
CLSCTX_INPROC_SERVER,
IID_IWMEncoder2,
(void**) &pEncoder);
}
// Configure the encoding session, including the sources, profile,
// and output file.
// Add the device as the audio source and video source.
if ( SUCCEEDED( hr ) )
{
hr = pSrcAud->SetInput(CComBSTR("Device://DEVICENAME"));
}
if ( SUCCEEDED( hr ) )
{
hr = pSrcVid->SetInput(CComBSTR("Device://DEVICENAME"));
}
// Retrieve the device control collection, then add a device to it.
if ( SUCCEEDED( hr ) )
{
hr = pSrcGrp2->get_DeviceControlCollection(&pDCColl);
}
if ( SUCCEEDED( hr ) )
{
hr = pDCColl->Add(&pDControl);
}
if ( SUCCEEDED( hr ) )
{
hr = pDControl->SetInput(CComBSTR("DeviceControl://DEVICENAME")); // Replace the device name.
}
// Initialize the encoding session. if ( SUCCEEDED( hr ) )
{
hr = pEncoder->PrepareToEncode(VARIANT_TRUE);
}
// Get the plug-in from the device. if ( SUCCEEDED( hr ) )
{
hr = pDControl->GetDeviceControlPlugin((IUnknown**)&pDCPlugin);
}
// Retrieve the current position as a WMTIMECODE_SAMPLE structure.
WMTIMECODE_SAMPLE strucPosition;
if ( SUCCEEDED( hr ) )
{
hr = pDCPlugin->get_CurrentPosition(&strucPosition);
}
// Release pointers.
if ( pSrcAud )
{
pSrcAud->Release();
pSrcAud = NULL;
}
if ( pSrcVid )
{
pSrcVid->Release();
pSrcVid = NULL;
}
if ( pDCColl )
{
pDCColl->Release();
pDCColl = NULL;
}
if ( pDControl )
{
pDControl->Release();
pDControl = NULL;
}
if ( pDCPlugin )
{
pDCPlugin->Release();
pDCPlugin = NULL;
}
if ( pEncoder )
{
pEncoder->Release();
pEncoder = NULL;
}
Requirements
Header: wmdevctl.h
Library: wmdevctl.dll
See Also
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