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    <p>Use <code>LoadLibrary</code> and <code>NtQueryKey</code> exported function as in the following code snippet.</p> <pre><code>#include &lt;windows.h&gt; #include &lt;string&gt; typedef LONG NTSTATUS; #ifndef STATUS_SUCCESS #define STATUS_SUCCESS ((NTSTATUS)0x00000000L) #endif #ifndef STATUS_BUFFER_TOO_SMALL #define STATUS_BUFFER_TOO_SMALL ((NTSTATUS)0xC0000023L) #endif std::wstring GetKeyPathFromKKEY(HKEY key) { std::wstring keyPath; if (key != NULL) { HMODULE dll = LoadLibrary(L"ntdll.dll"); if (dll != NULL) { typedef DWORD (__stdcall *NtQueryKeyType)( HANDLE KeyHandle, int KeyInformationClass, PVOID KeyInformation, ULONG Length, PULONG ResultLength); NtQueryKeyType func = reinterpret_cast&lt;NtQueryKeyType&gt;(::GetProcAddress(dll, "NtQueryKey")); if (func != NULL) { DWORD size = 0; DWORD result = 0; result = func(key, 3, 0, 0, &amp;size); if (result == STATUS_BUFFER_TOO_SMALL) { size = size + 2; wchar_t* buffer = new (std::nothrow) wchar_t[size/sizeof(wchar_t)]; // size is in bytes if (buffer != NULL) { result = func(key, 3, buffer, size, &amp;size); if (result == STATUS_SUCCESS) { buffer[size / sizeof(wchar_t)] = L'\0'; keyPath = std::wstring(buffer + 2); } delete[] buffer; } } } FreeLibrary(dll); } } return keyPath; } int _tmain(int argc, _TCHAR* argv[]) { HKEY key = NULL; LONG ret = ERROR_SUCCESS; ret = RegOpenKey(HKEY_LOCAL_MACHINE, L"SOFTWARE\\Microsoft", &amp;key); if (ret == ERROR_SUCCESS) { wprintf_s(L"Key path for %p is '%s'.", key, GetKeyPathFromKKEY(key).c_str()); RegCloseKey(key); } return 0; } </code></pre> <p>This will print the key path on the console:</p> <blockquote> <p>Key path for 00000FDC is '\REGISTRY\MACHINE\SOFTWARE\Microsoft'.</p> </blockquote>
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    1. PODetermine path to registry key from HKEY handle in C++
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    1. USJorge Ferreira
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    1. COAwesome, I was looking Exactly that!
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      1. USHernán
    2. CO[ZwQueryKey in MSDN](http://msdn.microsoft.com/en-us/library/ff567060(v=vs.85).aspx).
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    3. COOne more thing: in an application (in user mode) you should use `NtQueryKey` instead of `ZwQueryKey`.
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