DLI Implementation and Reference Guide - Datalogics

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3.2 DLI Implementation and Reference Guide Overview DLI provides a simple interface to create and write documents. It uses a document structure (DLPDFDOC) to differentiate between documents, allowing for the simultaneous creation of a number of documents. DLPDFDOC reflects the current status of the document at all times and is required input to most other DLI calls. As the document is created with Adobe PDF Library support, a CosDoc and a PDDoc are created within the Library, and these may be obtained from this structure for use in calls outside of DLI. The Adobe PDF Library establishes the name and many of the attributes of a document when it is completed, rather than when it is begun. Many existing composition engines do not do this. For this reason, the document structure has a convenient set of handles to permit the specification of such attributes at document creation time, rather than at document write time. There are a number of calls available at the Document Interface. Multiple documents may be created and maintained at one time. Required Use of Exception Handlers Except for dlpdfinit and dlpdfterm, all calls to the Document Interface must be within an exception handler (i.e. DURING/HANDLER/END_HANDLER statements) and all DLI documents should be destroyed prior to closing the Adobe PDF Library. This can be done all at once or one step at a time. Both DLI and the Adobe PDF Library may raise exceptions in the form of escapes. dlpdfinit and dlpdfterm must not be enclosed in these handlers because they are not set up before initialization, and are freed during termination. dlpdfdoccreate This method will create and return a pointer to a new document, as a DLPDFDOC pointer. As of DLI v3.0, this call no longer accepts a PostScript filename. (Use dlpdfdocsetpsname, or supply one to dlpdfdocwritePS.) It accepts one parameter, the DLPDFINSTANCE to use for the document. dlpdfdoccompress This method should be called before any content is placed onto a page. Content placed prior to this call will not be compressed. The compression algorithm used is Flate.
Beginning and Ending a Document 3.3 dlpdfdocembedfonts When this method is called, all fonts seen will be embedded in the document if possible, including Base 14 fonts. The flag set by this method is in DLPDFDOC->EmbedFonts, and may be safely manipulated by the client program. It is also possible to specify embedding and subsetting on the font create call. NOTE: If a font is available but not licensed for embedding, it will be created as a referenced font rather than an embedded font. An exception is not returned for this condition, but the NotEmbedded flag of the DLPDFFONT structure can be inspected after the dlpdfdocembedfonts call, if desired. dlpdfdocsetencoding The encoding of created fonts will default to WinAnsiEncoding on Windows machines and Standard encoding on all other platforms. You may set it to any valid encoding through this method. This encoding is used when the font create call does not include an encoding. dlpdfdocsetpdfname When the desired name of the PDF file resulting from this document is known at document creation time, it may be stored using this method and will be retrieved when the document is written. dlpdfdoclinearize When it is known at document creation time that this file should be written in a linearized form, this knowledge may be stored via this method and will be retrieved when the document is written. dlpdfdocsetdocinfo This method accepts couplets of information, each a string (encoded as PDFDocEncoding values), and saves them in the document information structure of the document. This may be done at any time. dlpdfdocmakethumbnails For Adobe PDF Library v4.x and higher, this method will create a thumbnail image for each page in the document. This call may be made at any time prior to writing the document. Thumbnails will be created automatically at document write time.
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DLI Implementation and Reference Guide - Datalogics

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