#ifndef _NTINTSAFE_H_INCLUDED_
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES)
//
// ULONG -> INT_PTR conversion
//
#ifdef _WIN64

_Must_inspect_result_
__inline
NTSTATUS
RtlULongToIntPtr(
    _In_ ULONG ulOperand,
    _Out_ _Deref_out_range_(==, ulOperand) INT_PTR* piResult)
{
    *piResult = (INT_PTR)ulOperand;
    return STATUS_SUCCESS;
}

#endif
#endif
#endif
View code on GitHub

#ifndef _NTINTSAFE_H_INCLUDED_
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES)
//
// ULONG -> INT_PTR conversion
//
#ifdef _WIN64
// ...
#else

#define RtlULongToIntPtr   RtlULongToInt

#endif
#endif
#endif
View code on GitHub

// ntintsafe.h

NTSTATUS RtlULongToIntPtr(
  [in]  ULONG   ulOperand,
  [out] INT_PTR *piResult
);
View the official Windows Driver Kit DDI reference

NtDoc

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Windows Driver Kit DDI reference (nf-ntintsafe-rtlulongtointptr)

RtlULongToIntPtr function

Description

Converts a value of type ULONG to a value of type INT_PTR.

Parameters

`ulOperand` [in]

The value to be converted.

`piResult` [out]

A pointer to the converted value. In the case where the conversion causes a truncation of the original value, the function returns STATUS_INTEGER_OVERFLOW and this parameter is not valid.

Return value

Returns STATUS_SUCCESS if the operation is successful.

See the implementation of this helper function in ntintsafe.h in the WDK for possible error return values.

Remarks

This is one of a set of inline functions designed to provide type conversions and perform validity checks with minimal impact on performance.

View the official Windows Driver Kit DDI reference