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TdhGetEventMapInformation helper added

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This commit is contained in:
Simon Rozman 2016-06-23 15:41:44 +02:00
parent 0507e4c5e8
commit 08bacb9e65
1 changed files with 28 additions and 0 deletions
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28
include/WinStd/ETW.h
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@ -31,6 +31,7 @@
#include <vector> #include <vector>
inline ULONG TdhGetEventInformation(_In_ PEVENT_RECORD pEvent, _In_ ULONG TdhContextCount, _In_ PTDH_CONTEXT pTdhContext, _Out_ std::unique_ptr<TRACE_EVENT_INFO> &info); inline ULONG TdhGetEventInformation(_In_ PEVENT_RECORD pEvent, _In_ ULONG TdhContextCount, _In_ PTDH_CONTEXT pTdhContext, _Out_ std::unique_ptr<TRACE_EVENT_INFO> &info);
inline ULONG TdhGetEventMapInformation(_In_ PEVENT_RECORD pEvent, _In_ LPWSTR pMapName, _Out_ std::unique_ptr<EVENT_MAP_INFO> &info);
namespace winstd namespace winstd
{ {
@ -74,6 +75,33 @@ inline ULONG TdhGetEventInformation(_In_ PEVENT_RECORD pEvent, _In_ ULONG TdhCon
} }
///
/// Retrieves information about the event map contained in the event.
///
/// \sa [TdhGetEventMapInformation function](https://msdn.microsoft.com/en-us/library/windows/desktop/aa964841.aspx)
///
inline ULONG TdhGetEventMapInformation(_In_ PEVENT_RECORD pEvent, _In_ LPWSTR pMapName, _Out_ std::unique_ptr<EVENT_MAP_INFO> &info)
{
BYTE szBuffer[WINSTD_STACK_BUFFER_BYTES];
ULONG ulSize = sizeof(szBuffer), ulResult;
// Try with stack buffer first.
ulResult = TdhGetEventMapInformation(pEvent, pMapName, (PEVENT_MAP_INFO)szBuffer, &ulSize);
if (ulResult == ERROR_SUCCESS) {
// Copy from stack.
info.reset((PEVENT_MAP_INFO)new char[ulSize]);
memcpy(info.get(), szBuffer, ulSize);
return ERROR_SUCCESS;
} else if (ulResult == ERROR_INSUFFICIENT_BUFFER) {
// Create buffer on heap and retry.
info.reset((PEVENT_MAP_INFO)new char[ulSize]);
return TdhGetEventMapInformation(pEvent, pMapName, info.get(), &ulSize);
}
return ulResult;
}
namespace winstd namespace winstd
{ {
/// ///