ObjectType property

此 API 条目保留标识符、签名、代码块和 PDF 术语的原始形式。

Returns the category of the page object at the specified index — text, path, image, shading, or form XObject. The classification matches the PDF content-stream operator that produced the object and lets callers iterate the page-object array with a single switch dispatch.

ObjectType returns a TObjectType enumeration value describing the kind of page object at Index:

• otText — text-showing operator (Tj, TJ, ', ") — a run of glyphs sharing a font and text matrix.
• otPath — vector path: lines, curves, rectangles, and fills. Use ObjectBounds to get the on-page rectangle.
• otImage — raster image. Pair with ObjectBitmap to retrieve pixels.
• otShading — gradient or function-based shading pattern (PDF axial/radial/coon shading).
• otForm — form XObject: a reusable sub-stream that may itself contain text, paths, and images.

The classification is stable and inexpensive; calling it in a tight loop over ObjectCount is the standard way to triage page content before deciding which more expensive accessor (ObjectBitmap, ObjectBounds, character properties) to call.

Form XObjects are not recursively expanded by this property — the type reports otForm and callers must descend into the form's own object list if they need the leaf-level content.

• The index space here is the page's full object list; this is wider than the image-only index used by Image and Bitmap.
• Page-object order roughly matches paint order, so iterating in increasing index renders bottom-up.
• Returns otText for indices that fall outside the valid range; always guard with ObjectCount.
• The enumeration values mirror PDFium's FPDF_PAGEOBJ_* constants from the underlying native API.

ObjectCount, ObjectBounds, ObjectBitmap, RemoveObject