The values returned from PDPageGetBBox don't match the page size values shown by Acrobat

The retrieved values of PDPageGetBBox are members of an ASFixedRect structure, which stores four ASFixed variables for use in defining rectangular areas:

Left Top Right Bottom

The variables are defined in the asexpt.h header file.

These are ASFixed values, which need to be converted to obtain their original point-value forms.

Library functions are available for conversion, such as ASFixedToFloat in this example:

ASFixedRect BBox;
...
PDPageGetBBox (InPage, &BBox);
printf("BBox.left = %f \n", ASFixedToFloat(BBox.left));
printf("BBox.top = %f \n", ASFixedToFloat(BBox.top));
printf("BBox.right = %f \n", ASFixedToFloat(BBox.right));
printf("BBox.bottom = %f \n", ASFixedToFloat(BBox.bottom));

The same conversion requirements hold true for PDPageGetMediaBox(), PDPageGetCropBox(), and PDPageGetBox().

Note that when Acrobat/Reader displays a page's dimensions, it reports the CropBox.