`pdfReadImageFormatEx`

Read geometry from an in-memory Windows GDI bitmap handle

BOOL32 __stdcall pdfReadImageFormatEx(PPDF IPDF, void* hBitmap, uint32_t* Width, uint32_t* Height, int32_t* BitsPerPixel, int32_t* UseZip);

Delphi

function pdfReadImageFormatEx(const IPDF: PPDF; hBitmap: Pointer; var Width, Height: Cardinal; var BitsPerPixel, UseZip: Integer): LongBool; stdcall;

Purpose. Read geometry from an in-memory Windows GDI bitmap handle (HBITMAP) instead of a file — for callers who already have a loaded bitmap (e.g. from a screen capture or another GDI operation) and want its dimensions without a round trip through a file.

Description. A different code path entirely from the file/buffer variants — no LoadImageFile/LoadImageFromBuffer call at all. Resolves geometry purely via GDI GetObject on the HBITMAP (ReadHBitmapFormat). UseZip is always 0 here (hardcoded, not derived from any format inspection — an HBITMAP has no compression format of its own to report).

Parameters.

Parameter	Description
`IPDF`	Document handle (unused for the read itself).
`hBitmap`	A Windows `HBITMAP` handle.
`Width`, `Height`	Output: pixel dimensions from `GetObject`.
`BitsPerPixel`	Output: from `GetObject`'s bitmap info.
`UseZip`	Output: always `0`.

Return value. True if GetObject resolved the handle successfully; False for an invalid/null hBitmap.

C# (P/Invoke)

wrappers/dotnet/LumasPdf.cs

[return: MarshalAs(UnmanagedType.Bool)]

Area

Forms