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This method uses our ever-familiar net.ContentLoader to make an Ajax request, passing the URL of an RSS feed as specified in the this.options.rssFeeds array. The forward parameter is a boolean specifying whether or not we re loading in new content as a result of moving forward. Given this knowledge, the itemIndex property is updated accordingly. Note that itemIndex is given the value of last rather than an integer if we re moving backward. That s because we want itemIndex to indicate the index of the last item in the previous RSS feed. The only problem is that we don t know how many items are in the feed, because it isn t loaded yet. You ll recall that the ajaxUpdate and handleError methods are required as an implicit contract with the net.ContentLoader. We will look next at the ajaxUpdate method, shown in listing 13.41, to see how the implementation resolves our indexing dilemma.

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ajaxUpdate: function(request) { if ( window.netscape && window.netscape.security.PrivilegeManager.enablePrivilege) netscape.security.PrivilegeManager.enablePrivilege( 'UniversalBrowserRead'); this.currentFeed = RSSFeed.parseXML(request.responseXML.documentElement); if ( this.itemIndex == "last" ) this.itemIndex = this.currentFeed.items.length - 1; this.updateView(); },

As a more complicated example of PInvoke usage, in this section we show how to benefit from memory mapping into F# programs Memory mapping is a popular technique that allows a program to see a file (or a portion of a file) as if it was in memory, providing an efficient way to access files because the operating system uses the machinery of virtual memory for accessing files and significantly speeding up data access on files After proper initialization, which we will cover in a moment, the program obtains a pointer into the memory, and access to that portion of memory appears the same as accessing data stored in or into the file Memory mapping can be used both for reading and writing files, and every access performed into the memory is reflected into the corresponding position into the file.

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The ajaxUpdate method starts with a check to see if it s running in an environment that provides a PrivilegeManager. If so, it asks to grant the UniversalBrowserRead privilege. As noted earlier, this is done so that our reader can run locally within a Mozilla-based browser. The this.currentFeed is an instance of our RSSFeed model object that we defined in the Model section. It corresponds to the single RSSFeed loaded into memory, as populated from the Ajax response. If this.itemIndex has a value of last as set by the loadRSSFeed method when moving backward the itemIndex property is updated to contain the actual number of items in the newly loaded RSSFeed. Finally, the UI is updated via a call to updateView(). Let s not forget to do our due diligence and define a handleError method both to satisfy our contract with the net.ContentLoader and because we really should do something to handle errors. If an RSS feed fails to load, we ll just provide a punt message, as shown in our handleError implementation. More sophisticated implementations are certainly possible and desirable.

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This is a typical sequence of system calls in order to map a file in memory: 1 A call to the CreateFile system call to open the file and obtain a handle to the file 2 A call to the CreateFileMapping system call to create a mapped file object 3 One or more calls to MapViewOfFile and UnmapViewOfFile to map and release portions of a file into memory In a typical usage, the whole file is mapped at once in memory 4 A call to CloseHandle to release the file The PInvoke interface to the required functions involves simple type mappings as is usual for Win32 API functions All the functions are in kernel32dll, and the signature can be found in the Windows SDK Listing 17-1 contains the definition of the F# wrapper for memory mapping.

handleError: function(request) { this.getLayer(this.visibleLayer).innerHTML = this.options.errorHTML; },

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pdf to thumbnail converter c#

how to create a thumbnail image of a pdf c#

how to create a thumbnail image of a pdf c#

how to create a thumbnail image of a pdf c#

how to create a thumbnail image of a pdf c#

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