思想坐标: september 2007

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12 september

为Adobe Acrobat 编写插件

在看pdf的时候，经常遇到一个烦心的问题，书签里的链接打开后，页面不是叶宽显示，而是显示的一整页，还要手动去选。专门研究了一下，写了一个JavaScript脚本，来解决这个问题。顺便说一下，Acrobat的JavaScript真烂。

   1: function SetBookmarksWidthPage(bm, nLevel)

   2: {

   3:         if(nLevel!=0)

   4:     {

   5:         console.println(bm.name+event.target.pageNum);

   6:         bm.execute();

7:

   8:         bm.setAction("this.pageNum="+event.target.pageNum+";this.zoomType = zoomtype.fitW;")

   9:     }

  10:     if (bm.children != null)

  11:         for (var i = 0; i < bm.children.length; i++)

  12:              SetBookmarksWidthPage(bm.children[i], nLevel + 1);

13:

  14: }

  15: app.addMenuItem({ cName: "Reset Bookmark View", cParent: "Advanced",

  16: cExec: "SetBookmarksWidthPage(event.target.bookmarkRoot, 0);",

  17: cEnable: "event.rc = (event.target != null);",

  18: nPos: 0

  19: });

会在“高级”菜单下添加一项"Reset Bookmark View"。

可是这样依然有个问题，书签里的Action显示的是Script，而不是象其他标准的显示的时Goto Destination。没办法，只好用C了。

   1: ACCB1 ASBool ACCB2 MyPluginSetmenu()

   2: {

   3:     return PluginMenuItem("Set Bookmark Fit Visable", "ADBE:BookmarkFit", false);

   4: }

   5: void iteratebookmark(PDBookmark bookmark,PDDoc doc)

   6: {

7:

   8:     PDAction action = PDBookmarkGetAction(bookmark);

   9:     ASAtom atom = PDActionGetSubtype (action);

  10:     if(!strcmp(ASAtomGetString (atom),"GoTo"))

  11:     {

  12:         //AVAlertNote(ASAtomGetString (atom));

  13:         PDViewDestination dest = PDActionGetDest(action);

  14:         ASInt32 pageNum;

  15:         ASAtom fitType;

  16:         ASFixedRect destRect;

  17:         ASFixed zoom;

  18:         //AVAlertNote("done1");

  19:         PDViewDestGetAttr(dest,&pageNum,&fitType,&destRect,&zoom);

  20:         //AVAlertNote("done2");

  21:         PDViewDestination newdest = PDViewDestCreate(doc,PDDocAcquirePage (doc, pageNum),ASAtomFromString("FitBV"),&destRect,PDViewDestNULL, 0);

  22:         PDAction newaction = PDActionNewFromDest ( doc,newdest,doc);

  23:         PDBookmarkSetAction ( bookmark,newaction);

  24:         //AVAlertNote("done3");

  25:     }

  26:     if (PDBookmarkHasChildren (bookmark))

  27:     {

  28:         PDBookmark treeBookmark = PDBookmarkGetFirstChild(bookmark);

  29:         while (PDBookmarkIsValid (treeBookmark))

  30:         {

  31:             iteratebookmark (treeBookmark,doc);

  32:             treeBookmark = PDBookmarkGetNext(treeBookmark);

  33:         }

  34:     }

  35: }

  36: ACCB1 void ACCB2 MyPluginCommand(void *clientData)

  37: {

  38:     // get this plugin's name for display

  39:     ASAtom NameAtom = ASExtensionGetRegisteredName (gExtensionID);

  40:     const char * name = ASAtomGetString(NameAtom);

  41:     char str[256];

  42:     sprintf(str,"This menu item is added by plugin %s.\n", name);

  43:     AVDoc avDoc = AVAppGetActiveDoc();

44:

  45:     if(avDoc==NULL) {

  46:         // if no doc is loaded, make a message.

  47:         //strcat(str,);

  48:         AVAlertNote("There is no PDF document loaded in Acrobat.");

  49:     }

  50:     else {

  51:         PDBookmark theroot;

  52:         PDDoc pddoc = AVDocGetPDDoc (avDoc);

  53:         theroot = PDDocGetBookmarkRoot(pddoc);

  54:         iteratebookmark(theroot,pddoc);

  55:         return;

  56:     }

  57:     return;

  58: }

59:

  60: ACCB1 ASBool ACCB2 MyPluginIsEnabled(void *clientData)

  61: {

  62:     return AVAppGetActiveDoc()!=NULL;

  63: }

依然是一个递归算法。只需要和Acrobat SDK里面的Basic Plugin的BasicPluginInit.cpp结合就可以使用了。生成的.api文件实际上是一个dll。

可是这样还是不够完美。书签属性里面，Zoom显示的是Custom，而不是Fit Width。想不出什么原因了。。。

PDViewDestCreate所使用的ASAtom，可以由以下几种String得到：FitBV，FitBH，FitH, FitV, FitR, FitB, Fit, XYZ。Acrobat的文档上竟然没有，还是从http://itext.ugent.be/library/api/com/lowagie/text/pdf/PdfDestination.html找到的。