I've looked for examples and documentation, but I still can't figure this out...
How do you use RegQueryValueEx (not the PdhXxx functions) to query for something like Disk Bytes/sec?
I've tried the following:
DWORD type;
static union { TCHAR Data[32 * 1024]; PERF_DATA_BLOCK Perf; } perf;//Stack buffer
DWORD cbData = sizeof(perf);
LSTATUS s = RegQueryValueEx(HKEY_PERFORMANCE_DATA,
_T("PhysicalDisk"), NULL, &type, (LPBYTE)&perf, &cbData);
PPERF_OBJECT_TYPE pObjType =
(PPERF_OBJECT_TYPE)((BYTE*)&perf + perf.Perf.HeaderLength);
but it just returns a header with no data. :(
You can't query for the data by name like that. Instead, you need to query by index. MSDN can help you with some code to find out the appropriate index to query. Unfortunately, you need to make the determination of which index at run-time.
For example, the following SHOULD retrieve the performance data for the processor.
LSTATUS s = RegQueryValueEx(HKEY_PERFORMANCE_DATA, _T("238"), NULL,
&type, (LPBYTE)&perf, &cbData);
Related
I am writing a CLR profiler using the ICorProfilerInfo interface.
When using SetEnterLeaveFunctionHooks, the callback methods are passed a FunctionID.
How do I get the metadata (I am after the name in particular), of a function given this FunctionID?
An MSDN article suggests that the first call should be to GetFunctionInfo. The documentation for this function states:
The profiler code can call ICorProfilerInfo::GetModuleMetaData to obtain a metadata interface for a given module. The metadata token that is returned to the location referenced by pToken can then be used to access the metadata for the function.
It does not elaborate on the last sentence ('the metadata token ... can be used to access metadata for the function').
How does this work?
So far, I am doing the following:
void MyProfiler::EnterMethod(FunctionID functionID)
{
ClassID classId = 0;
ModuleID moduleId = 0;
mdToken metaDataToken = 0;
IMetaDataImport* metaDataImport = NULL;
// (m_info is ICorProfilerInfo3)
m_info->GetFunctionInfo(functionID, &classId, &moduleId, &metaDataToken);
m_info->GetModuleMetaData(moduleId, ofRead, IID_IMetaDataImport, (IUnknown**)&metaDataImport);
// What goes here?
}
I have tried to call GetTypeRefProps like this:
mdToken ptkResolutionScope;
WCHAR szName[1024];
ULONG cchName = 1024;
ULONG pchName;
HRESULT result = MetaDataImport->GetTypeRefProps(pToken, &ptkResolutionScope, szName, cchName, &pchName);
The final call returns S_FALSE, and does not populate szName.
GetTypeRefProps is only applicable when your token is a TypeRef token, GetFunctionInfo will give you a MethodDef token which requires you to use the GetMethodProps method.
metaDataImport->GetMethodProps(metaDataToken, NULL, szName, cchName, &pchName, NULL, NULL, NULL, NULL, NULL);
Why is the last statement throwing Access Violation?
I wanted to write the status of a service into an XML file.
#define STR_SERVICE_STATUS_INPUT__XML_CONTENT _T("<SERVICE NAME = \"%s\" STARTUP_TYPE = \"0x%d\" />\r\n\r\n")
CString csWriteBufferTemp;
DWORD dwBufferSize;
DWORD dwBytesNeeded;
SC_HANDLE schHandle;
LPQUERY_SERVICE_CONFIG st_lpqscServiceInfo;
schHandle = OpenService(IN_schHandle, (CString)cArgentServices[i], SERVICE_QUERY_CONFIG);
bRC = QueryServiceConfig(schHandle, NULL, 0, &dwBytesNeeded);
dwBufferSize = dwBytesNeeded; //Size needed.
st_lpqscServiceInfo = (LPQUERY_SERVICE_CONFIG) LocalAlloc(LMEM_FIXED, dwBufferSize);
bRC = QueryServiceConfig(schHandle, st_lpqscServiceInfo, dwBufferSize, &dwBytesNeeded);
csWriteBufferTemp.Format(STR_SERVICE_STATUS_INPUT__XML_CONTENT__,st_lpqscServiceInfo->lpDisplayName,0);
You are almost certainly using the wrong string format parameter in _T("<SERVICE NAME = \"%S\" STARTUP_TYPE = \"0x%d\" />\r\n\r\n"). The lpServiceStartName member of SERVICE_QUERY_CONFIG and CString are both TCHAR-based so they should have matching character types regardless of whether your compiling in Unicode mode or not. In that case, you should be using %s instead of %S.
Thanks for all your replies and suggestions, I found the answer on another site. I don't know if this is the correct way but it works!
LPQUERY_SERVICE_CONFIG
st_lpqscServiceInfo;
SC_HANDLE schHandle;
st_lpqscServiceInfo = (LPQUERY_SERVICE_CONFIG) LocalAlloc(LPTR, 4096);
schHandle = OpenSCManager(IN_pszMachineName,SERVICES_ACTIVE_DATABASE, SERVICE_QUERY_CONFIG);
bRC = QueryServiceConfig(schHandle, st_lpqscServiceInfo, dwBufferSize, &dwBytesNeeded);
csWriteBufferTemp.Format(STR_SERVICE_STATUS_INPUT__XML_CONTENT__,st_lpqscServiceInfo->lpDisplayName,0);
I have my xml as char buffer (that's fetched from server, I don't want to save it -> takes extra time and is completely obsolete):
char myword[] = "...xml..."
xmlSchemaParserCtxtPtr ctxt = xmlSchemaNewParserCtxt(xsdFilePath);
xmlDocPtr doc = ?;
Now I need to get doc. I'm trying to use following function:
doc = xmlReadMemory(myword, sizeof(myword), ?URL?, NULL, 0)
But the problem is with URL, what should I put in there..? Am I using this function right? Maybe there is another way to get xmlDocPtr?
BTW: I need xmlDocPtr to perform:
ret = xmlSchemaValidateDoc(ctxt, doc);
Simply pass a NULL pointer:
doc = xmlReadMemory(myword, sizeof(myword), NULL, NULL, 0);
The first two lines of this code showing file name excluding device name like /Document/temp but I want
to show also device name like L"\Device\Harddisk0\DR0\Document\temp. I am using this code to call ObQueryNameString routine but it is showing NULL.
Please tell me what is wrong with code. I think memory is not allocating
properly.
PFILE_OBJECT pFileObject = IoGetCurrentIrpStackLocation(Irp)->FileObject;
if (pFileObject)
{
DbgPrint("FileName : %wZ\n", pFileObject->FileName);
}
NTSTATUS status = STATUS_UNSUCCESSFUL;
OBJECT_NAME_INFORMATION objName = {0};
ULONG ReturnLength = 1024;
ObQueryNameString(DeviceObject, objName, sizeof(objName), ReturnLength);
DbgPrint("FileName : %wZ\n", &objName);
Have you considered using GetFullPathName function?
Refer to http://msdn.microsoft.com/en-us/library/aa364963%28VS.85%29.aspx for more accurate explanation what it does.
Ideally, what I'd like to be able to do is take the name of a time zone and ask Windows for its corresponding time zone info (offset from UTC, DST offset, dates for DST switch, etc.). It looks like Windows uses a TIME_ZONE_INFORMATION struct to hold this sort of info. So, presumably, I want a function which takes a string with the time zone's name and returns a TIME_ZONE_INFORMATION struct.
However, all I can find are functions such as GetTimeZoneInformation() which give me the TIME_ZONE_INFORMATION for the local time. What I need is a function which will give me that information for an arbitrary time zone regardless of what the local time zone is.
The only way that I see to get that information is to go grab it directly from the registry, which is less than ideal. The TIME_ZONE_INFORMATION page shows where it is in the registry, so it should be possible to fetch the information from there, but I'd much prefer a proper system function for doing it. Does such a function exist, or do I have to go registry diving to get the time zone info for an arbitrary time zone?
The time zone information is contained as binary data in the registry under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\(zone name)\TZI. The structure of the data is given in the TIME_ZONE_INFORMATION documentation:
struct STimeZoneFromRegistry
{
long Bias;
long StandardBias;
long DaylightBias;
SYSTEMTIME StandardDate;
SYSTEMTIME DaylightDate;
};
And here's example code to read the key:
TIME_ZONE_INFORMATION tz = {0};
STimeZoneFromRegistry binary_data;
DWORD size = sizeof(binary_data);
HKEY hk = NULL;
TCHAR zone_key[] = _T("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\Central Standard Time");
if ((RegOpenKeyEx(HKEY_LOCAL_MACHINE, zone_key, 0, KEY_QUERY_VALUE, &hk) == ERROR_SUCCESS) &&
(RegQueryValueEx(hk, "TZI", NULL, NULL, (BYTE *) &binary_data, &size) == ERROR_SUCCESS))
{
tz.Bias = binary_data.Bias;
tz.DaylightBias = binary_data.DaylightBias;
tz.DaylightDate = binary_data.DaylightDate;
tz.StandardBias = binary_data.StandardBias;
tz.StandardDate = binary_data.StandardDate;
}
Edit: Sorry, this answer is redundant - I'm sure you could have figured all this out using the documentation you linked to in the question. I've only had to do this once, and this is the only method I could find.
Have you look at this:
http://msdn.microsoft.com/en-us/library/system.timezoneinfo.getsystemtimezones.aspx
Here is an example without the registry. The timezone information depends on the year, so I added a parameter to hold that.
TIME_ZONE_INFORMATION GmtTimezone( const wstring& name, SYSTEMTIME utc )
{
DYNAMIC_TIME_ZONE_INFORMATION dynamicTimezone = {};
DWORD result=0;
for( DWORD i = 0; result!=ERROR_NO_MORE_ITEMS; ++i )
{
result = ::EnumDynamicTimeZoneInformation( i, &dynamicTimezone );
if( result==ERROR_SUCCESS && name==dynamicTimezone.StandardName )
break;
}
if( result!=ERROR_SUCCESS )
throw L"Could not find timezone "+name;
TIME_ZONE_INFORMATION tz;
if( !GetTimeZoneInformationForYear(static_cast<USHORT>(utc.wYear), &dynamicTimezone, &tz) )
throw "GetTimeZoneInformationForYear failed"+std::to_string(GetLastError());
return tz;
//SYSTEMTIME localTime;
//SystemTimeToTzSpecificLocalTime( &tz, &utc, &localTime );
//auto offsetHours = localTime.wHour-utc.wHour;
}