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pdftalk4gemstone [2021/07/28 18:19]
christian [File out Gemstone code] 		pdftalk4gemstone [2022/03/07 10:31] (current)
bekki
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 ====== PDFtalk for Gemstone ====== ====== PDFtalk for Gemstone ======
  
-Library for reading and writing PDF files in Gemstone.+Library for reading and writing PDF files in [[https://github.com/GsDevKit/GsDevKit_home|GsDevKit for Gemstone]].
  
 The source is on [[https://github.com/ChristianHaider/PDFtalk-for-Gemstone|on Github]] and comes in two files: **''[[https://github.com/ChristianHaider/PDFtalk-for-Gemstone/blob/master/PDFtalk.gs|PDFtalk.gs]]''** with the runtime code and **''[[https://github.com/ChristianHaider/PDFtalk-for-Gemstone/blob/master/PDFtalkTesting.gs|PDFtalkTesting.gs]]''** with tests and demos. UI tools and helpers used in VisualWorks are not included, because of the server nature of Gemstone. The source is on [[https://github.com/ChristianHaider/PDFtalk-for-Gemstone|on Github]] and comes in two files: **''[[https://github.com/ChristianHaider/PDFtalk-for-Gemstone/blob/master/PDFtalk.gs|PDFtalk.gs]]''** with the runtime code and **''[[https://github.com/ChristianHaider/PDFtalk-for-Gemstone/blob/master/PDFtalkTesting.gs|PDFtalkTesting.gs]]''** with tests and demos. UI tools and helpers used in VisualWorks are not included, because of the server nature of Gemstone.
 +
 +With [[releasenotes#pdftalk_250|version 2.5]] a new file of the library with the 182 standard [[cmap|CMaps]] was added: **''[[https://github.com/ChristianHaider/PDFtalk-for-Gemstone/blob/master/PDFtalkWithCMaps.gs|PDFtalkWithCMaps.gs]]''**.
  
 The new symbol dictionary **''PDFtalkLibrary''** will appear in the symbol list after filein (and **''PDFtalkTesting''** after filing in the testing file). This symbol dictionary represents the namespace ''Smalltalk'' of the library with the ''Values'' code and some general tools. This dictionary need to be in scope (i.e. on the symbol list) when using it. The new symbol dictionary **''PDFtalkLibrary''** will appear in the symbol list after filein (and **''PDFtalkTesting''** after filing in the testing file). This symbol dictionary represents the namespace ''Smalltalk'' of the library with the ''Values'' code and some general tools. This dictionary need to be in scope (i.e. on the symbol list) when using it.
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 The namespaces from VisualWorks are implemented by symbol dictionaries in Gemstone. Therefore, the ''PDFtalkLibrary'' contains the dictionary ''PDFtalk'' with all PDF classes. The ''PDFtalk'' dictionary in turn contains the ''Fonts'' dictionary which includes the ''OpenType'' and ''CFF'' dictionaries. the following slide of the [[https://www.slideshare.net/esug/pdftalk-for-gemstone|ESUG 2017 presentation]] shows the structure: The namespaces from VisualWorks are implemented by symbol dictionaries in Gemstone. Therefore, the ''PDFtalkLibrary'' contains the dictionary ''PDFtalk'' with all PDF classes. The ''PDFtalk'' dictionary in turn contains the ''Fonts'' dictionary which includes the ''OpenType'' and ''CFF'' dictionaries. the following slide of the [[https://www.slideshare.net/esug/pdftalk-for-gemstone|ESUG 2017 presentation]] shows the structure:
  
-{{:pdftalk_namespaces.png?nolink|Namespace dictionaries in Gemstone}}+{{:namespaces_gemstone.png?nolink|Namespace dictionaries in Gemstone}}
  
 Accessing classes in namespaces is written differently. For example: Accessing classes in namespaces is written differently. For example:
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 The dictionary ''PDFtalk'' (or the other namespace dictionaries) should not be in scope (on the symbol list) unless you extend or change the library itself. Unfortunately, you need to put the dictionaries on the symbol list in order to browse them :-(. The dictionary ''PDFtalk'' (or the other namespace dictionaries) should not be in scope (on the symbol list) unless you extend or change the library itself. Unfortunately, you need to put the dictionaries on the symbol list in order to browse them :-(.
  
-With the 2.5 release, the new ''PostScript'' dictionary is also present in the PDFtalkLibrary.+With the [[releasenotes#pdftalk_250|2.5 release]], the new ''PostScript'' dictionary is also present in the PDFtalkLibrary.
  
 ===== Get started ===== ===== Get started =====
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 </code> </code>
  
-This will throw an error, because the directories are not set to your environment. Just edit the directory in the method and proceed.+You should change the directory in the two methods.
 ==== File into Gemstone ==== ==== File into Gemstone ====
  
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 ===== Runtime considerations ===== ===== Runtime considerations =====
  
-There are some global variables caching objects (fonts, encodings, the type hierarchy). These caches are lazily filled when accessed first. In a runtime, you may want to reset and fill all caches before deploying, either because of limited rights of the runtime user or to eliminate startup overhead-.+There are some global variables caching objects (fonts, encodings, the type hierarchy). These caches are lazily filled when accessed first. In a runtime, you may want to reset and fill all caches before deploying, either because of limited rights of the runtime user or to eliminate startup overhead.
  
 After all your application code is loaded, do the following to reset and fill all caches: After all your application code is loaded, do the following to reset and fill all caches:
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 ===== Images ===== ===== Images =====
  
-There is code to save ImageXObjects as Value (i.e. source code which will reconstruct to object).+There is code to save ImageXObjects as Value (i.e. source code which will reconstruct the object).
 To produce the source string for a PDF image you send it ''asSource''. (Or you can send ''asPDF asSource'' to a VisualWorks Image). To produce the source string for a PDF image you send it ''asSource''. (Or you can send ''asPDF asSource'' to a VisualWorks Image).
 This string can be evaluated in Gemstone with ''evaluate'' and will reconstruct the ImageXObject, which can be put into a PDF page as usual. This string can be evaluated in Gemstone with ''evaluate'' and will reconstruct the ImageXObject, which can be put into a PDF page as usual.
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 anImageXObject asMethod: selectorSymbol in: protocolSymbol package: packageString anImageXObject asMethod: selectorSymbol in: protocolSymbol package: packageString
 </code> </code>
-I added several example images with this to ImageXObject. You can also look at the new ImageXTests where the images are used.+I added several example images with this to ImageXObject. You can also look at ImageXTests where the images are used.
 These methods can be transferred easily form VW to Gemstone and you get the image just by calling that method. These methods can be transferred easily form VW to Gemstone and you get the image just by calling that method.
  
  • pdftalk4gemstone.1627489151.txt.gz
  • Last modified: 2021/07/28 18:19
  • by christian