1.FPDF_InitLibrary(NULL);
CPDF_CustomAccess::CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess)
{
if (pFileAccess)
m_FileAccess = *pFileAccess;
}
FPDF_LoadCustomDocument
CPDF_CustomAccess* pFil
int first_page = FPDFAvail_GetFirstPageNum(doc);
(void) FPDFAvail_IsPageAvail(pdf_avail, first_page, &hints);
e = FX_NEW CPDF_CustomAccess(pFileAccess);
int page_count = FPDF_GetPageCount(doc); //页数统计
FPDF_DOCUMENT doc;
https://pdfium.patagames.com/help/html/m_patagames_pdf_pdfium_fpdf_loaddocument.htm api接口说明