/*****************************************************************************
CreateDeviceFromID
Utility for attaching to WIA and getting a root IWiaItem interface
*****************************************************************************/
HRESULT
CreateDeviceFromId (__in LPWSTR szDeviceId, IWiaItem **ppItem)
{
IWiaDevMgr *pDevMgr;
HRESULT hr = CoCreateInstance (CLSID_WiaDevMgr,
NULL,
CLSCTX_LOCAL_SERVER,
IID_IWiaDevMgr,
reinterpret_cast<LPVOID*>(&pDevMgr));
if (SUCCEEDED(hr))
{
BSTR strId = SysAllocString (szDeviceId);
if (strId)
{
hr = pDevMgr->CreateDevice (strId, ppItem);
SysFreeString (strId);
}
else
{
hr = E_OUTOFMEMORY;
}
pDevMgr->Release ();
}
return hr;
}
int __cdecl _tmain( int, TCHAR *[] )
{
//
// Initialize COM
//
HRESULT hr = CoInitialize(NULL);
if (SUCCEEDED(hr))
{
//
// Create the device manager
//
IWiaDevMgr *pWiaDevMgr = NULL;
hr = CreateWiaDeviceManager( &pWiaDevMgr );
if (SUCCEEDED(hr))
{
//
// Enumerate all of the WIA devices
//
hr = EnumerateWiaDevices( pWiaDevMgr );
if (FAILED(hr))
{
ReportError( TEXT("Error calling EnumerateWiaDevices"), hr );
}
//
// Release the device manager
//
pWiaDevMgr->Release();
pWiaDevMgr = NULL;
}
else
{
ReportError( TEXT("Error calling CreateWiaDeviceManager"), hr );
}
//
// Uninitialize COM
//
CoUninitialize();
}
return 0;
}
