The device: Belkin Wemo Switch
Dev environment: MS VC++ 2010 on Windows7
I'm trying to enumerate the services of a UPnP device using C++ from Windows.
I've got the IUPnPDevice pointer and can access several properties.
I've got the IUPnPServices pointer and can count the correct number of services (7).
I use QueryInterface() to get the IEnumVARIANT pointer (which appears to succeed).
However, the Next() method always fails with HRESULT of 0x80040500 - which translates as Windows error 1280 (0x500) - ERROR_ALREADY_FIBER.
This error does not make any sense to me.
(I've tried using both IEnumVARIANT and IEnumUnknown - as the docs indicate it could be either, but both produce the same result.)
I've included below the complete source file, plus the output it produces.
[Note: It's hardcoded to use the udn of my own device]
I'd be very grateful if anyone can help as I'm currently stuck.
Best regards,
Dave
Code:
// UpnpTest1.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <windows.h>
#include <upnp.h>
static void DumpComError(const TCHAR *api, HRESULT hr);
int _tmain(int argc, _TCHAR* argv[])
{
int retcode=-1; // assume failure
HRESULT hr = CoInitialize(0);
if (hr==S_OK)
{
IUPnPDeviceFinder *deviceFinder=0;
hr = CoCreateInstance(CLSID_UPnPDeviceFinder, 0, CLSCTX_INPROC_SERVER, IID_IUPnPDeviceFinder, (void**)&deviceFinder);
if (hr==S_OK)
{
IUPnPDevice *device=0;
hr = deviceFinder->FindByUDN(L"uuid:Socket-1_0-221239K11002F6", &device);
if (hr==S_OK)
{
if (device)
{
TCHAR *manufacturer=0, *manufacturerUrl=0;
TCHAR *description=0, *name=0, *modelUrl=0;
TCHAR *serialNumber=0, *udn=0, *upc=0, *deviceType=0;
TCHAR *presentationUrl=0;
device->get_ManufacturerName(&manufacturer);
device->get_ManufacturerURL(&manufacturerUrl);
device->get_Description(&description);
device->get_FriendlyName(&name);
device->get_ModelURL(&modelUrl);
device->get_SerialNumber(&serialNumber);
device->get_UniqueDeviceName(&udn);
device->get_UPC(&upc);
device->get_Type(&deviceType);
device->get_PresentationURL(&presentationUrl);
_tprintf(_T("MANUFACTURER: %s [%s]\n"), manufacturer, manufacturerUrl);
_tprintf(_T("MODEL: %s [%s]\n [%s]\n"), description, name, modelUrl);
_tprintf(_T("DEVICE: serial=%s\n udn=%s\n upc=%s\n type=%s\n"), serialNumber, udn, upc, deviceType);
_tprintf(_T("URL: %s\n"), presentationUrl);
IUPnPServices *services=0;
hr = device->get_Services(&services);
if (hr==S_OK)
{
if (services)
{
long numberOfServices=0;
services->get_Count(&numberOfServices);
if (numberOfServices>0)
{
IUnknown *unknown=0;
hr = services->get__NewEnum(&unknown);
if (hr==S_OK)
{
if (unknown)
{
IEnumVARIANT *enumInterface=0;
hr = unknown->QueryInterface(IID_IEnumVARIANT,(void**)&enumInterface);
if (enumInterface)
{
VARIANT var;
unsigned long fetched=0;
hr = enumInterface->Next(1, &var, &fetched);
if (hr==S_OK)
{
}
else
DumpComError(_T("IEnumVARIANT::Next"), hr);
}
else
DumpComError(_T("IUnknown::QueryInterface"), hr);
}
else
fprintf(stderr, "Failed to get enumeration interface.\n");
}
else
DumpComError(_T("IUPnPServices::get__NewEnum"), hr);
}
else
fprintf(stderr, "No services available.\n");
}
else
fprintf(stderr, "Failed to get services collection.\n");
}
else
DumpComError(_T("IUPnPDevice::get_Services"), hr);
}
else
fprintf(stderr, "Device not found.\n");
}
else
DumpComError(_T("IUPnPDeviceFinder::FindByUDN"), hr);
}
else
DumpComError(_T("CoCreateIndex"), hr);
}
else
DumpComError(_T("CoInitialize"), hr);
return retcode;
}
static void AddBoolToString(const TCHAR *name, bool value, TCHAR *buf, int &i, int max)
{
if (name && *name && value && buf && i>=0)
i += _snwprintf_s(&buf[i], max-i, (max-i-1)*sizeof(TCHAR), _T("%s%s=YES"), (i>0? _T("; "): _T("")), name);
}
static void AddIntToString(const TCHAR *name, int value, TCHAR *buf, int &i, int max)
{
if (name && *name && value && buf && i>=0)
i += _snwprintf_s(&buf[i], max-i, (max-i-1)*sizeof(TCHAR), _T("%s%s=%d"), (i>0? _T("; "): _T("")), name, value);
}
static void DumpComError(const TCHAR *api, HRESULT hr)
{
bool failure = (hr&0x80000000? true: false);
bool severe = (hr&0x40000000? true: false);
bool microsoft = (hr&0x20000000? false: true);
bool ntStatus = (hr&0x10000000? true: false);
bool xBit = (hr&0x08000000? true: false);
int facility = (hr&0x07FF0000)>>16;
int code = (hr&0x0000FFFF);
TCHAR buf[1024]={0};
int bufsize = sizeof(buf)/sizeof(TCHAR);
int i=0;
AddBoolToString(_T("failure"), failure, buf, i, bufsize);
AddBoolToString(_T("severe"), severe, buf, i, bufsize);
AddBoolToString(_T("microsoft"), microsoft, buf, i, bufsize);
AddBoolToString(_T("ntStatus"), ntStatus, buf, i, bufsize);
AddBoolToString(_T("xBit"), xBit, buf, i, bufsize);
AddIntToString(_T("facility"), facility, buf, i, bufsize);
AddIntToString(_T("code"), code, buf, i, bufsize);
_ftprintf(stderr, _T("\n%s() failed, hr=0x%08x\n[%s]\n"), api, hr, buf);
}
Output: It produces following output:
MANUFACTURER: Belkin International Inc. [http://www.belkin.com/]
MODEL: Belkin Plugin Socket 1.0 [WeMo Switch]
[http://www.belkin.com/plugin/]
DEVICE: serial=221239K11002F6
udn=uuid:Socket-1_0-221239K11002F6
upc=123456789
type=urn:Belkin:device:controllee:1
URL: http://192.168.1.16:49153/pluginpres.html
IEnumVARIANT::Next() failed, hr=0x80040500
[failure=YES; microsoft=YES; facility=4; code=1280]
EDIT:
After a lot of dead-ends, I have managed to get this working by manually building the SOAP requests, and sending the requests via TCP using Windows sockets. Tricky bit was getting the syntax just right as I had no experience of SOAP before. [UPnP was useful to identify the IP address & port number - as these can change]. Once up and running - it's actually a lot simpler than the UPnP interface. Let me know if you're interested and I can post the code... It doesn't directly answer the question I posed here, so it wouldn't make sense to answer my question with this detail.
However, if you're interested, let me know and I can post the code.
Cheers,
Dave
