BOOL CEnumerateSerial::UsingGetDefaultCommConfig(CSimpleArray<UINT>& ports)
#endif
{
//Make sure we clear out any elements which may already be in the array
#if defined CENUMERATESERIAL_USE_STL
ports.clear();
#else
ports.RemoveAll();
#endif
//Up to 255 COM ports are supported so we iterate through all of them seeing
//if we can get the default configuration
for (UINT i=1; i<256; i++)
{
//Form the Raw device name
CString sPort;
sPort.Format(_T("COM%u"), i);
COMMCONFIG cc;
DWORD dwSize = sizeof(COMMCONFIG);
if (GetDefaultCommConfig(sPort, &cc, &dwSize))
{
#if defined CENUMERATESERIAL_USE_STL
ports.push_back(i);
#else
ports.Add(i);
#endif
}
}
//Return the success indicator
return TRUE;
}
BOOL CEnumerateSerial::UsingEnumPorts(CSimpleArray<UINT>& ports)
#endif
{
//Make sure we clear out any elements which may already be in the array
#if defined CENUMERATESERIAL_USE_STL
ports.clear();
#else
ports.RemoveAll();
#endif
//Call the first time to determine the size of the buffer to allocate
DWORD cbNeeded = 0;
DWORD dwPorts = 0;
EnumPorts(NULL, 1, NULL, 0, &cbNeeded, &dwPorts);
//What will be the return value
BOOL bSuccess = FALSE;
//Allocate the buffer and recall
CAutoHeapAlloc portsBuffer;
if (portsBuffer.Allocate(cbNeeded))
{
BYTE* pPorts = static_cast<BYTE*>(portsBuffer.m_pData);
bSuccess = EnumPorts(NULL, 1, pPorts, cbNeeded, &cbNeeded, &dwPorts);
if (bSuccess)
{
PORT_INFO_1* pPortInfo = reinterpret_cast<PORT_INFO_1*>(pPorts);
for (DWORD i=0; i<dwPorts; i++)
{
//If it looks like "COMX" then
//add it to the array which will be returned
size_t nLen = _tcslen(pPortInfo->pName);
if (nLen > 3)
{
if ((_tcsnicmp(pPortInfo->pName, _T("COM"), 3) == 0) && IsNumeric(&(pPortInfo->pName[3]), TRUE))
{
//Work out the port number
int nPort = _ttoi(&(pPortInfo->pName[3]));
#if defined CENUMERATESERIAL_USE_STL
ports.push_back(nPort);
#else
ports.Add(nPort);
#endif
}
}
pPortInfo++;
}
}
}
else
SetLastError(ERROR_OUTOFMEMORY);
return bSuccess;
}
BOOL CEnumerateSerial::UsingCreateFile(CSimpleArray<UINT>& ports)
#endif
{
//Make sure we clear out any elements which may already be in the array
#if defined CENUMERATESERIAL_USE_STL
ports.clear();
#else
ports.RemoveAll();
#endif
//Up to 255 COM ports are supported so we iterate through all of them seeing
//if we can open them or if we fail to open them, get an access denied or general error error.
//Both of these cases indicate that there is a COM port at that number.
for (UINT i=1; i<256; i++)
{
//Form the Raw device name
CString sPort;
sPort.Format(_T("\\\\.\\COM%u"), i);
//Try to open the port
BOOL bSuccess = FALSE;
CAutoHandle port(CreateFile(sPort, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0));
if (port == INVALID_HANDLE_VALUE)
{
DWORD dwError = GetLastError();
//Check to see if the error was because some other app had the port open or a general failure
if (dwError == ERROR_ACCESS_DENIED || dwError == ERROR_GEN_FAILURE || dwError == ERROR_SHARING_VIOLATION || dwError == ERROR_SEM_TIMEOUT)
bSuccess = TRUE;
}
else
{
//The port was opened successfully
bSuccess = TRUE;
}
//Add the port number to the array which will be returned
if (bSuccess)
{
#if defined CENUMERATESERIAL_USE_STL
ports.push_back(i);
#else
ports.Add(i);
#endif
}
}
//Return the success indicator
return TRUE;
}
BOOL CEnumerateSerial::UsingWMI(CSimpleArray<UINT>& ports, CSimpleArray<CString>& friendlyNames)
#endif
{
//Make sure we clear out any elements which may already be in the array(s)
#if defined CENUMERATESERIAL_USE_STL
ports.clear();
friendlyNames.clear();
#else
ports.RemoveAll();
friendlyNames.RemoveAll();
#endif
//What will be the return value
BOOL bSuccess = FALSE;
//Create the WBEM locator
ATL::CComPtr<IWbemLocator> locator;
HRESULT hr = CoCreateInstance(CLSID_WbemLocator, NULL, CLSCTX_INPROC_SERVER, IID_IWbemLocator, reinterpret_cast<void**>(&locator));
if (SUCCEEDED(hr))
{
ATL::CComPtr<IWbemServices> services;
hr = locator->ConnectServer(_bstr_t("\\\\.\\root\\cimv2"), NULL, NULL, NULL, 0, NULL, NULL, &services);
if (SUCCEEDED(hr))
{
//Execute the query
ATL::CComPtr<IEnumWbemClassObject> classObject;
hr = services->CreateInstanceEnum(_bstr_t("Win32_SerialPort"), WBEM_FLAG_RETURN_WBEM_COMPLETE, NULL, &classObject);
if (SUCCEEDED(hr))
{
bSuccess = TRUE;
//Now enumerate all the ports
hr = WBEM_S_NO_ERROR;
//Final Next will return WBEM_S_FALSE
while (hr == WBEM_S_NO_ERROR)
{
ULONG uReturned = 0;
ATL::CComPtr<IWbemClassObject> apObj[10];
hr = classObject->Next(WBEM_INFINITE, 10, reinterpret_cast<IWbemClassObject**>(apObj), &uReturned);
if (SUCCEEDED(hr))
{
for (ULONG n=0; n<uReturned; n++)
{
ATL::CComVariant varProperty1;
HRESULT hrGet = apObj[n]->Get(L"DeviceID", 0, &varProperty1, NULL, NULL);
if (SUCCEEDED(hrGet) && (varProperty1.vt == VT_BSTR) && (wcslen(varProperty1.bstrVal) > 3))
{
//If it looks like "COMX" then add it to the array which will be returned
if ((_wcsnicmp(varProperty1.bstrVal, L"COM", 3) == 0) && IsNumeric(&(varProperty1.bstrVal[3]), TRUE))
{
//Work out the port number
int nPort = _wtoi(&(varProperty1.bstrVal[3]));
#if defined CENUMERATESERIAL_USE_STL
ports.push_back(nPort);
#else
ports.Add(nPort);
#endif
//Also get the friendly name of the port
ATL::CComVariant varProperty2;
if (SUCCEEDED(apObj[n]->Get(L"Name", 0, &varProperty2, NULL, NULL)) && (varProperty2.vt == VT_BSTR))
{
#if defined CENUMERATESERIAL_USE_STL
#if defined _UNICODE
std::wstring szName(varProperty2.bstrVal);
#else
std::string szName(ATL::CW2A(varProperty2.bstrVal));
#endif
friendlyNames.push_back(szName);
#else
friendlyNames.Add(CString(varProperty2.bstrVal));
#endif
}
else
{
#if defined CENUMERATESERIAL_USE_STL
friendlyNames.push_back(_T(""));
#else
friendlyNames.Add(_T(""));
#endif
}
}
}
}
}
}
}
}
}
return bSuccess;
}
BOOL CEnumerateSerial::UsingSetupAPI2(CSimpleArray<UINT>& ports, CSimpleArray<CString>& friendlyNames)
#endif
{
//Make sure we clear out any elements which may already be in the array(s)
#if defined CENUMERATESERIAL_USE_STL
ports.clear();
friendlyNames.clear();
#else
ports.RemoveAll();
friendlyNames.RemoveAll();
#endif
//Get the function pointers to "SetupDiGetClassDevs", "SetupDiGetClassDevs", "SetupDiEnumDeviceInfo", "SetupDiOpenDevRegKey"
//and "SetupDiDestroyDeviceInfoList" in setupapi.dll
CAutoHModule setupAPI(LoadLibraryFromSystem32(_T("SETUPAPI.DLL")));
if (setupAPI == NULL)
return FALSE;
SETUPDIOPENDEVREGKEY* lpfnLPSETUPDIOPENDEVREGKEY = reinterpret_cast<SETUPDIOPENDEVREGKEY*>(GetProcAddress(setupAPI, "SetupDiOpenDevRegKey"));
#if defined _UNICODE
SETUPDICLASSGUIDSFROMNAME* lpfnSETUPDICLASSGUIDSFROMNAME = reinterpret_cast<SETUPDICLASSGUIDSFROMNAME*>(GetProcAddress(setupAPI, "SetupDiClassGuidsFromNameW"));
SETUPDIGETCLASSDEVS* lpfnSETUPDIGETCLASSDEVS = reinterpret_cast<SETUPDIGETCLASSDEVS*>(GetProcAddress(setupAPI, "SetupDiGetClassDevsW"));
SETUPDIGETDEVICEREGISTRYPROPERTY* lpfnSETUPDIGETDEVICEREGISTRYPROPERTY = reinterpret_cast<SETUPDIGETDEVICEREGISTRYPROPERTY*>(GetProcAddress(setupAPI, "SetupDiGetDeviceRegistryPropertyW"));
#else
SETUPDICLASSGUIDSFROMNAME* lpfnSETUPDICLASSGUIDSFROMNAME = reinterpret_cast<SETUPDICLASSGUIDSFROMNAME*>(GetProcAddress(setupAPI, "SetupDiClassGuidsFromNameA"));
SETUPDIGETCLASSDEVS* lpfnSETUPDIGETCLASSDEVS = reinterpret_cast<SETUPDIGETCLASSDEVS*>(GetProcAddress(setupAPI, "SetupDiGetClassDevsA"));
SETUPDIGETDEVICEREGISTRYPROPERTY* lpfnSETUPDIGETDEVICEREGISTRYPROPERTY = reinterpret_cast<SETUPDIGETDEVICEREGISTRYPROPERTY*>(GetProcAddress(setupAPI, "SetupDiGetDeviceRegistryPropertyA"));
#endif
SETUPDIDESTROYDEVICEINFOLIST* lpfnSETUPDIDESTROYDEVICEINFOLIST = reinterpret_cast<SETUPDIDESTROYDEVICEINFOLIST*>(GetProcAddress(setupAPI, "SetupDiDestroyDeviceInfoList"));
SETUPDIENUMDEVICEINFO* lpfnSETUPDIENUMDEVICEINFO = reinterpret_cast<SETUPDIENUMDEVICEINFO*>(GetProcAddress(setupAPI, "SetupDiEnumDeviceInfo"));
if ((lpfnLPSETUPDIOPENDEVREGKEY == NULL) || (lpfnSETUPDICLASSGUIDSFROMNAME == NULL) || (lpfnSETUPDIDESTROYDEVICEINFOLIST == NULL) ||
(lpfnSETUPDIENUMDEVICEINFO == NULL) || (lpfnSETUPDIGETCLASSDEVS == NULL) || (lpfnSETUPDIGETDEVICEREGISTRYPROPERTY == NULL))
{
//Set the error to report
setupAPI.m_dwError = ERROR_CALL_NOT_IMPLEMENTED;
return FALSE;
}
//First need to convert the name "Ports" to a GUID using SetupDiClassGuidsFromName
DWORD dwGuids = 0;
lpfnSETUPDICLASSGUIDSFROMNAME(_T("Ports"), NULL, 0, &dwGuids);
if (dwGuids == 0)
{
//Set the error to report
setupAPI.m_dwError = GetLastError();
return FALSE;
}
//Allocate the needed memory
ATL::CHeapPtr<GUID> pGuids;
if (!pGuids.Allocate(dwGuids))
{
//Set the error to report
setupAPI.m_dwError = ERROR_OUTOFMEMORY;
return FALSE;
}
//Call the function again
if (!lpfnSETUPDICLASSGUIDSFROMNAME(_T("Ports"), pGuids, dwGuids, &dwGuids))
{
//Set the error to report
setupAPI.m_dwError = GetLastError();
return FALSE;
}
//Now create a "device information set" which is required to enumerate all the ports
HDEVINFO hDevInfoSet = lpfnSETUPDIGETCLASSDEVS(pGuids, NULL, NULL, DIGCF_PRESENT);
if (hDevInfoSet == INVALID_HANDLE_VALUE)
{
//Set the error to report
setupAPI.m_dwError = GetLastError();
return FALSE;
}
//Finally do the enumeration
BOOL bMoreItems = TRUE;
int nIndex = 0;
SP_DEVINFO_DATA devInfo;
while (bMoreItems)
{
//Enumerate the current device
devInfo.cbSize = sizeof(SP_DEVINFO_DATA);
bMoreItems = lpfnSETUPDIENUMDEVICEINFO(hDevInfoSet, nIndex, &devInfo);
if (bMoreItems)
{
//Did we find a serial port for this device
BOOL bAdded = FALSE;
//Get the registry key which stores the ports settings
HKEY hDeviceKey = lpfnLPSETUPDIOPENDEVREGKEY(hDevInfoSet, &devInfo, DICS_FLAG_GLOBAL, 0, DIREG_DEV, KEY_QUERY_VALUE);
if (hDeviceKey)
{
int nPort = 0;
if (QueryRegistryPortName(hDeviceKey, nPort))
{
#if defined CENUMERATESERIAL_USE_STL
ports.push_back(nPort);
#else
ports.Add(nPort);
#endif
bAdded = TRUE;
}
//Close the key now that we are finished with it
RegCloseKey(hDeviceKey);
}
//If the port was a serial port, then also try to get its friendly name
if (bAdded)
{
TCHAR szFriendlyName[1024];
szFriendlyName[0] = _T('\0');
DWORD dwSize = sizeof(szFriendlyName);
DWORD dwType = 0;
if (lpfnSETUPDIGETDEVICEREGISTRYPROPERTY(hDevInfoSet, &devInfo, SPDRP_DEVICEDESC, &dwType, reinterpret_cast<PBYTE>(szFriendlyName), dwSize, &dwSize) && (dwType == REG_SZ))
{
#if defined CENUMERATESERIAL_USE_STL
friendlyNames.push_back(szFriendlyName);
#else
friendlyNames.Add(szFriendlyName);
#endif
}
else
{
#if defined CENUMERATESERIAL_USE_STL
friendlyNames.push_back(_T(""));
#else
friendlyNames.Add(_T(""));
#endif
}
}
}
++nIndex;
}
//Free up the "device information set" now that we are finished with it
lpfnSETUPDIDESTROYDEVICEINFOLIST(hDevInfoSet);
//Return the success indicator
return TRUE;
}
BOOL CEnumerateSerial::UsingQueryDosDevice(CSimpleArray<UINT>& ports)
#endif
{
//What will be the return value from this function (assume the worst)
BOOL bSuccess = FALSE;
//Make sure we clear out any elements which may already be in the array
#if defined CENUMERATESERIAL_USE_STL
ports.clear();
#else
ports.RemoveAll();
#endif
//Determine what OS we are running on
OSVERSIONINFO osvi;
osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
BOOL bGetVer = GetVersionEx(&osvi);
//On NT use the QueryDosDevice API
if (bGetVer && (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT))
{
//Use QueryDosDevice to look for all devices of the form COMx. Since QueryDosDevice does
//not consitently report the required size of buffer, lets start with a reasonable buffer size
//of 4096 characters and go from there
int nChars = 4096;
BOOL bWantStop = FALSE;
while (nChars && !bWantStop)
{
ATL::CHeapPtr<TCHAR> szDevices;
if (szDevices.Allocate(nChars))
{
DWORD dwChars = QueryDosDevice(NULL, szDevices, nChars);
if (dwChars == 0)
{
DWORD dwError = GetLastError();
if (dwError == ERROR_INSUFFICIENT_BUFFER)
{
//Expand the buffer and loop around again
nChars *= 2;
}
else
bWantStop = TRUE;
}
else
{
bSuccess = TRUE;
bWantStop = TRUE;
size_t i=0;
while (szDevices[i] != _T('\0'))
{
//Get the current device name
TCHAR* pszCurrentDevice = &(szDevices[i]);
//If it looks like "COMX" then
//add it to the array which will be returned
size_t nLen = _tcslen(pszCurrentDevice);
if (nLen > 3)
{
if ((_tcsnicmp(pszCurrentDevice, _T("COM"), 3) == 0) && IsNumeric(&(pszCurrentDevice[3]), FALSE))
{
//Work out the port number
int nPort = _ttoi(&pszCurrentDevice[3]);
#if defined CENUMERATESERIAL_USE_STL
ports.push_back(nPort);
#else
ports.Add(nPort);
#endif
}
}
//Go to next device name
i += (nLen + 1);
}
}
}
else
{
bWantStop = TRUE;
SetLastError(ERROR_OUTOFMEMORY);
}
}
}
else
SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
return bSuccess;
}
BOOL CEnumerateSerial::UsingRegistry(CSimpleArray<CString>& ports)
#endif
{
//Make sure we clear out any elements which may already be in the array(s)
#if defined CENUMERATESERIAL_USE_STL
ports.clear();
#else
ports.RemoveAll();
#endif
//What will be the return value from this function (assume the worst)
BOOL bSuccess = FALSE;
HKEY hSERIALCOMM;
if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("HARDWARE\\DEVICEMAP\\SERIALCOMM"), 0, KEY_QUERY_VALUE, &hSERIALCOMM) == ERROR_SUCCESS)
{
//Get the max value name and max value lengths
DWORD dwMaxValueNameLen;
DWORD dwMaxValueLen;
DWORD dwQueryInfo = RegQueryInfoKey(hSERIALCOMM, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &dwMaxValueNameLen, &dwMaxValueLen, NULL, NULL);
if (dwQueryInfo == ERROR_SUCCESS)
{
DWORD dwMaxValueNameSizeInChars = dwMaxValueNameLen + 1; //Include space for the NULL terminator
DWORD dwMaxValueNameSizeInBytes = dwMaxValueNameSizeInChars * sizeof(TCHAR);
DWORD dwMaxValueDataSizeInChars = dwMaxValueLen/sizeof(TCHAR) + 1; //Include space for the NULL terminator
DWORD dwMaxValueDataSizeInBytes = dwMaxValueDataSizeInChars * sizeof(TCHAR);
//Allocate some space for the value name and value data
ATL::CHeapPtr<TCHAR> szValueName;
ATL::CHeapPtr<BYTE> byValue;
if (szValueName.Allocate(dwMaxValueNameSizeInChars) && byValue.Allocate(dwMaxValueDataSizeInBytes))
{
bSuccess = TRUE;
//Enumerate all the values underneath HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM
DWORD dwIndex = 0;
DWORD dwType;
DWORD dwValueNameSize = dwMaxValueNameSizeInChars;
DWORD dwDataSize = dwMaxValueDataSizeInBytes;
memset(szValueName.m_pData, 0, dwMaxValueNameSizeInBytes);
memset(byValue.m_pData, 0, dwMaxValueDataSizeInBytes);
LONG nEnum = RegEnumValue(hSERIALCOMM, dwIndex, szValueName, &dwValueNameSize, NULL, &dwType, byValue, &dwDataSize);
while (nEnum == ERROR_SUCCESS)
{
//If the value is of the correct type, then add it to the array
if (dwType == REG_SZ)
{
TCHAR* szPort = reinterpret_cast<TCHAR*>(byValue.m_pData);
#if defined CENUMERATESERIAL_USE_STL
ports.push_back(szPort);
#else
ports.Add(szPort);
#endif
}
//Prepare for the next time around
dwValueNameSize = dwMaxValueNameSizeInChars;
dwDataSize = dwMaxValueDataSizeInBytes;
memset(szValueName.m_pData, 0, dwMaxValueNameSizeInBytes);
memset(byValue.m_pData, 0, dwMaxValueDataSizeInBytes);
++dwIndex;
nEnum = RegEnumValue(hSERIALCOMM, dwIndex, szValueName, &dwValueNameSize, NULL, &dwType, byValue, &dwDataSize);
}
}
else
SetLastError(ERROR_OUTOFMEMORY);
}
//Close the registry key now that we are finished with it
RegCloseKey(hSERIALCOMM);
if (dwQueryInfo != ERROR_SUCCESS)
SetLastError(dwQueryInfo);
}
return bSuccess;
}
BOOL CEnumerateSerial::UsingComDB(CSimpleArray<UINT>& ports)
#endif
{
//Make sure we clear out any elements which may already be in the array(s)
#if defined CENUMERATESERIAL_USE_STL
ports.clear();
#else
ports.RemoveAll();
#endif
//What will be the return value from this function (assume the worst)
BOOL bSuccess = FALSE;
//Get the function pointers to "ComDBOpen", "ComDBClose" & "ComDBGetCurrentPortUsage" in msports.dll
CAutoHModule msPorts(LoadLibraryFromSystem32(_T("MSPORTS.DLL")));
if (msPorts == NULL)
return FALSE;
COMDBOPEN* lpfnLPCOMDBOPEN = reinterpret_cast<COMDBOPEN*>(GetProcAddress(msPorts, "ComDBOpen"));
COMDBCLOSE* lpfnLPCOMDBCLOSE = reinterpret_cast<COMDBCLOSE*>(GetProcAddress(msPorts, "ComDBClose"));
COMDBGETCURRENTPORTUSAGE* lpfnCOMDBGETCURRENTPORTUSAGE = reinterpret_cast<COMDBGETCURRENTPORTUSAGE*>(GetProcAddress(msPorts, "ComDBGetCurrentPortUsage"));
if ((lpfnLPCOMDBOPEN != NULL) && (lpfnLPCOMDBCLOSE != NULL) && (lpfnCOMDBGETCURRENTPORTUSAGE != NULL))
{
//First need to open up the DB
HCOMDB hComDB;
DWORD dwComOpen = lpfnLPCOMDBOPEN(&hComDB);
if (dwComOpen == ERROR_SUCCESS)
{
//Work out the size of the buffer required
DWORD dwMaxPortsReported = 0;
DWORD dwPortUsage = lpfnCOMDBGETCURRENTPORTUSAGE(hComDB, NULL, 0, CDB_REPORT_BYTES, &dwMaxPortsReported);
if (dwPortUsage == ERROR_SUCCESS)
{
//Allocate some heap space and recall the function
ATL::CHeapPtr<BYTE> portBytes;
if (portBytes.Allocate(dwMaxPortsReported))
{
bSuccess = TRUE;
if (lpfnCOMDBGETCURRENTPORTUSAGE(hComDB, portBytes, dwMaxPortsReported, CDB_REPORT_BYTES, &dwMaxPortsReported) == ERROR_SUCCESS)
{
//Work thro the byte bit array for ports which are in use
for (DWORD i=0; i<dwMaxPortsReported; i++)
{
if (portBytes[i])
{
#if defined CENUMERATESERIAL_USE_STL
ports.push_back(i + 1);
#else
ports.Add(i + 1);
#endif
}
}
}
}
else
msPorts.m_dwError = ERROR_OUTOFMEMORY;
}
else
msPorts.m_dwError = dwPortUsage;
//Close the DB
lpfnLPCOMDBCLOSE(hComDB);
}
else
msPorts.m_dwError = dwComOpen;
}
else
msPorts.m_dwError = ERROR_CALL_NOT_IMPLEMENTED;
return bSuccess;
}
BOOL CEnumerateSerial::UsingWMI(CSimpleArray<UINT>& ports, CSimpleArray<CString>& friendlyNames)
#endif
{
//Make sure we clear out any elements which may already be in the array(s)
#if defined CENUMERATESERIAL_USE_STL
ports.clear();
friendlyNames.clear();
#else
ports.RemoveAll();
friendlyNames.RemoveAll();
#endif
//What will be the return value
BOOL bSuccess = FALSE;
//Create the WBEM locator
IWbemLocator* pLocator = NULL;
HRESULT hr = CoCreateInstance(CLSID_WbemLocator, NULL, CLSCTX_INPROC_SERVER, IID_IWbemLocator, reinterpret_cast<void**>(&pLocator));
if (SUCCEEDED(hr))
{
IWbemServices* pServices = NULL;
hr = pLocator->ConnectServer(_bstr_t("\\\\.\\root\\cimv2"), NULL, NULL, NULL, 0, NULL, NULL, &pServices);
if (SUCCEEDED(hr))
{
//Execute the query
IEnumWbemClassObject* pClassObject = NULL;
hr = pServices->CreateInstanceEnum(_bstr_t("Win32_SerialPort"), WBEM_FLAG_RETURN_WBEM_COMPLETE, NULL, &pClassObject);
if (SUCCEEDED(hr))
{
bSuccess = TRUE;
//Now enumerate all the ports
hr = WBEM_S_NO_ERROR;
//Final Next will return WBEM_S_FALSE
while (hr == WBEM_S_NO_ERROR)
{
ULONG uReturned = 0;
IWbemClassObject* apObj[10];
memset(apObj, 0, sizeof(apObj));
hr = pClassObject->Next(WBEM_INFINITE, 10, reinterpret_cast<IWbemClassObject**>(apObj), &uReturned);
if (SUCCEEDED(hr))
{
for (ULONG n=0; n<uReturned; n++)
{
VARIANT varProperty1;
VariantInit(&varProperty1);
HRESULT hrGet = apObj[n]->Get(L"DeviceID", 0, &varProperty1, NULL, NULL);
if (SUCCEEDED(hrGet) && (varProperty1.vt == VT_BSTR) && (wcslen(varProperty1.bstrVal) > 3))
{
//If it looks like "COMX" then add it to the array which will be returned
if ((_wcsnicmp(varProperty1.bstrVal, L"COM", 3) == 0) && IsNumeric(&(varProperty1.bstrVal[3]), TRUE))
{
//Work out the port number
int nPort = _wtoi(&(varProperty1.bstrVal[3]));
#if defined CENUMERATESERIAL_USE_STL
ports.push_back(nPort);
#else
ports.Add(nPort);
#endif
//Also get the friendly name of the port
VARIANT varProperty2;
VariantInit(&varProperty2);
if (SUCCEEDED(apObj[n]->Get(L"Name", 0, &varProperty2, NULL, NULL)) && (varProperty2.vt == VT_BSTR))
{
#if defined CENUMERATESERIAL_USE_STL
#if defined _UNICODE
std::wstring szName(varProperty2.bstrVal);
#else
CAutoHeapAlloc szAsciiValue;
int nLengthA = WideCharToMultiByte(CP_ACP, 0, varProperty2.bstrVal, -1, NULL, 0, NULL, NULL);
if (nLengthA)
{
if (szAsciiValue.Allocate(nLengthA))
WideCharToMultiByte(CP_ACP, 0, varProperty2.bstrVal, -1, static_cast<LPSTR>(szAsciiValue.m_pData), nLengthA, NULL, NULL);
}
std::string szName(static_cast<LPSTR>(szAsciiValue.m_pData));
#endif
friendlyNames.push_back(szName);
#else
friendlyNames.Add(CString(varProperty2.bstrVal));
#endif
}
else
{
#if defined CENUMERATESERIAL_USE_STL
friendlyNames.push_back(_T(""));
#else
friendlyNames.Add(_T(""));
#endif
}
//Free up the variant;
VariantClear(&varProperty2);
}
}
//Free up the variant;
VariantClear(&varProperty1);
//Free up each COM interface
apObj[n]->Release();
}
}
}
//Free up the COM interface
pClassObject->Release();
}
//Free up the COM interface
pServices->Release();
}
//Free up the COM interface
pLocator->Release();
}
return bSuccess;
}
BOOL CEnumerateSerial::UsingQueryDosDevice(CSimpleArray<UINT>& ports)
#endif
{
//What will be the return value from this function (assume the worst)
BOOL bSuccess = FALSE;
//Make sure we clear out any elements which may already be in the array
#if defined CENUMERATESERIAL_USE_STL
ports.clear();
#else
ports.RemoveAll();
#endif
//On the NT kernel use the QueryDosDevice API
OSVERSIONINFOEX osvi;
memset(&osvi, 0, sizeof(osvi));
osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
osvi.dwPlatformId = VER_PLATFORM_WIN32_NT;
ULONGLONG dwlConditionMask = 0;
VER_SET_CONDITION(dwlConditionMask, VER_PLATFORMID, VER_EQUAL);
if (VerifyVersionInfo(&osvi, VER_PLATFORMID, dwlConditionMask))
{
//Use QueryDosDevice to look for all devices of the form COMx. Since QueryDosDevice does
//not consitently report the required size of buffer, lets start with a reasonable buffer size
//of 4096 characters and go from there
int nChars = 4096;
BOOL bWantStop = FALSE;
while (nChars && !bWantStop)
{
CAutoHeapAlloc devices;
if (devices.Allocate(nChars * sizeof(TCHAR)))
{
LPTSTR pszDevices = static_cast<LPTSTR>(devices.m_pData);
DWORD dwChars = QueryDosDevice(NULL, pszDevices, nChars);
if (dwChars == 0)
{
DWORD dwError = GetLastError();
if (dwError == ERROR_INSUFFICIENT_BUFFER)
{
//Expand the buffer and loop around again
nChars *= 2;
}
else
bWantStop = TRUE;
}
else
{
bSuccess = TRUE;
bWantStop = TRUE;
size_t i=0;
while (pszDevices[i] != _T('\0'))
{
//Get the current device name
TCHAR* pszCurrentDevice = &(pszDevices[i]);
//If it looks like "COMX" then
//add it to the array which will be returned
size_t nLen = _tcslen(pszCurrentDevice);
if (nLen > 3)
{
if ((_tcsnicmp(pszCurrentDevice, _T("COM"), 3) == 0) && IsNumeric(&(pszCurrentDevice[3]), FALSE))
{
//Work out the port number
int nPort = _ttoi(&pszCurrentDevice[3]);
#if defined CENUMERATESERIAL_USE_STL
ports.push_back(nPort);
#else
ports.Add(nPort);
#endif
}
}
//Go to next device name
i += (nLen + 1);
}
}
}
else
{
bWantStop = TRUE;
SetLastError(ERROR_OUTOFMEMORY);
}
}
}
else
SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
return bSuccess;
}