THotPDF.SetLoadedPageBox Method

Sets the page bounding box (MediaBox, CropBox, BleedBox, TrimBox, or ArtBox) for the specified page in the loaded PDF document

Declaration

procedure SetLoadedPageBox(PageIndex: Integer; Box: THPDFPageBoundary; ARect: THPDFRect);

HPDFDoc

Name	Purpose
`PageIndex`	Zero-based index of the target page; 0 indicates the first page
`Box`	The type of page boundary to set, which takes the value of the THPDFPageBoundary enumeration (MediaBox, CropBox, BleedBox, TrimBox, ArtBox)
`ARect`	New bounding rectangle, represented in PDF user space coordinates (points) with the origin at the bottom-left corner

CropBox 须被 MediaBox 完全包含，否则打印或显示时可能产生裁剪异常
BleedBox and TrimBox are primarily used in print workflows; standard screen display readers usually only use MediaBox and CropBox
The save method must be called after modification to write changes to the file