LPVOID

LPVOID stands for Long Pointer to VOID and is a Windows API typedef for a generic pointer to any data. In Windows headers, LPVOID is defined as void, making it effectively identical to PVOID. The name reflects historical naming conventions from older Windows environments, but in 32-bit and 64-bit Windows the memory model is flat, so LPVOID is functionally the same as a plain void.

As a generic data pointer, LPVOID is used in many Windows API function signatures to pass or receive buffers without specifying the element type. It is not a handle or a type-safe container; it simply represents a memory address that can be cast to a more specific pointer type as needed. For example, a thread function prototype commonly uses LPVOID for its parameter, allowing arbitrary user data to be passed to the thread. Other APIs may take or return LPVOID for memory blocks, such as functions that return a pointer to allocated memory or that operate on raw buffers.

Because LPVOID is a void pointer, using it requires casting to the appropriate type before dereferencing to access the underlying data. This is a standard C/C++ practice when dealing with generic pointers. Related Windows typedefs include PVOID (another name for void) and LPCVOID (const void), reflecting the same underlying pointer concept with differing qualifiers.

In summary, LPVOID is a legacy-friendly alias for a generic void pointer used throughout the Windows API to handle untyped memory addresses in a type-agnostic way.