pdfUTF16ToUTF32Ex

void* __stdcall pdfUTF16ToUTF32(PPDF IPDF, const wchar_t* Source);
void* __stdcall pdfUTF16ToUTF32Ex(PPDF IPDF, const wchar_t* Source, uint32_t* Len);
const wchar_t* __stdcall pdfUTF32ToUTF16(PPDF IPDF, void* Source);
const wchar_t* __stdcall pdfUTF32ToUTF16Ex(PPDF IPDF, void* Source, uint32_t* Len);
BOOL32 __stdcall pdfFreeUniBuf(PPDF IPDF);

function pdfUTF16ToUTF32(const IPDF: PPDF; const Source: PWideChar): Pointer; stdcall;
function pdfUTF16ToUTF32Ex(const IPDF: PPDF; const Source: PWideChar; var Len: Cardinal): Pointer; stdcall;
function pdfUTF32ToUTF16(const IPDF: PPDF; Source: Pointer): PWideChar; stdcall;
function pdfUTF32ToUTF16Ex(const IPDF: PPDF; Source: Pointer; var Len: Cardinal): PWideChar; stdcall;
function pdfFreeUniBuf(const IPDF: PPDF): LongBool; stdcall;

Purpose. Convert between UTF-16 (wchar_t, this platform's native wide-char encoding) and UTF-32 (fixed 4-byte code points) — useful for callers whose own runtime uses UTF-32 wchar_t (e.g. Linux/macOS language bindings under V18) interoperating with this Windows-native UTF-16 SDK.

Description. pdfUTF16ToUTF32/Ex allocate and return a UTF-32 buffer (AllocUTF32); the plain form discards the resulting length (Ex returns it via Len). pdfUTF32ToUTF16/Ex are the inverse (AllocUTF16). All four buffers are document-owned and transient — pdfFreeUniBuf explicitly releases whichever such buffer is currently held, though (consistent with this SDK's general transient-buffer convention) a subsequent conversion call also implicitly invalidates the previous one.

Parameters.

Return value. The converted buffer/string pointer; nil if IPDF is invalid. pdfFreeUniBuf: True if IPDF is valid.

C# (P/Invoke)

public static extern IntPtr pdfUTF16ToUTF32Ex(IntPtr IPDF, [MarshalAs(UnmanagedType.LPWStr)] string Source, ref uint Len);