RenderPageLayerToString
Rendering, annotations, form fields, binary output
Returns one page layer as binary PNG data held in an AnsiString
Syntax
function RenderPageLayerToString(DPI: Double; Page,
LayerKind: Integer): AnsiString;Parameters
| Parameter | Description |
|---|---|
DPI | Positive output resolution in dots per inch |
Page | 1-based page number |
LayerKind | 0 selects base page content, 1 annotations, 2 form fields, and 3 all interactive objects |
Return values
Binary PNG data on success, or an empty string when the request is invalid or rendering fails
Remarks
Interactive layer PNGs include transparency and are suitable for overlay composition; treat the returned value as binary data rather than encoded text
See also
RenderPageLayerToStream, RenderPageLayerToFile, RenderPageToString