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for i in range(10): print read_object(fin) This should output something like this: Listing 6-17. Loading objects from disk! ==================== Simple[0] Simple[1] Simple[2] Simple[3] Simple[4] Simple[5] Simple[6] Simple[7] Simple[8] Simple[9] So now we re doing something interesting. Let s look at exactly what happening here. First, you ll notice that the Simple object is rendering nicely: the Simple object can render itself using the __unicode__ method. This is clearly an improvement over the earlier rendering of the object with angle brackets and a hex code. The write_object function is fairly straightforward, we re just converting our objects into strings using the pickle module, computing the length of the string and then writing the length and the actual serialized object to disk. This is fine, but the read side is a bit clunky. We don t really know when to stop reading. We can fix this using the iteration protocol. Which bring us to one of my favorite reasons to use objects at all in Jython. vb.net ean 128 reader Packages matching GS1-128 - NuGet Gallery
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VB . NET GS1-128 Generator for .NET class, Data Matrix, PDF417, QRCode, Code128, Code39. In Jython, we have duck typing. If it walks like a duck, quacks like a duck, and looks like a duck, it s a duck. This is in stark contrast to more rigid languages like C# or Java which have formal interface definitions. One of the nice benefits of having duck typing is that Jython has the notion of object protocols. If you happen to implement the right methods, Jython will recognize your object as a certain type of thing . Iterators are objects that look like lists that let you read the next object. Implementing an iterator protocol is straightforward: just implement a next() method and a __iter__ method, and you re ready to rock and roll. Let s see this in action: Listing 6-18. class PickleStream(object): """ This stream can be used to stream objects off of a raw file stream """ def __init__(self, file): self.file = file When tables are not union compatible, you can often remedy the incompatibility in the SELECT clauses. For example, the two tables on the right side of Figure 7-4 have the columns in different orders. We can alter that order in the query, as shown in Listing 7-3. vb.net ean 128 reader GS1 128 Generator DLL in VB | Free . NET program sample code ...
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I suggest you use Google as there is a lot of information on the topic: http://en. lmgtfy.com/?q=ucc+ ean - 128 +barcode+generator[^]. —SA. The addDVD.aspx page adds a new DVD and includes processing to update the XML document. The page follows: <%@ Page Language="VB" %> <%@ import Namespace="System.Xml" %> <script runat="server"> Private Sub btnAdd_Click(sender As Object, e As EventArgs) Dim myXmlDocument as XmlDocument = new XmlDocument() myXmlDocument.Load (server.mappath("dvd.xml")) Dim rootNode as XMLElement = myXmlDocument.DocumentElement Dim intNewID as Integer = rootNode.childNodes.count + 1 Dim newDVDElement as XMLElement = myXmlDocument.CreateElement("DVD") newDVDElement.SetAttribute("id",intNewID) Dim newTitleElement as XMLElement = myXmlDocument.CreateElement("title") newTitleElement.appendChild(myXmlDocument.CreateTextNode(txtTitle.text)) Dim newFormatElement as XMLElement = myXmlDocument.CreateElement("format") newFormatElement.appendChild(myXmlDocument.CreateTextNode(txtFormat.text)) Dim newGenreElement as XMLElement = myXmlDocument.CreateElement("genre") newGenreElement.appendChild(myXmlDocument.CreateTextNode(txtGenre.text)) newDVDElement.appendChild(newTitleElement) newDVDElement.appendChild(newFormatElement) newDVDElement.appendChild(newGenreElement) rootNode.appendChild(newDVDElement) myXmlDocument.Save(Server.Mappath("dvd.xml")) lblMessage.text = "You have successfully updated the XML document" def write(self, obj): data = dumps(obj) length = len(data) self.file.write("%020d" % length) self.file.write(data) def __iter__(self): return self def next(self): data = self.file.read(20) if len(data) == 0: raise StopIteration length = int(data) return loads(self.file.read(length)) def close(self): self.file.close() This class will let you wrap a simple file object and you can now send it raw Jython objects to write to a file, or you can read objects out as if the stream was just a list of objects. Writing and reading becomes much simpler: Listing 6-19. with closing(PickleStream(open('simplefile','wb'))) as stream: for i in range(10): obj = Simple(i) stream.write(obj) with closing(PickleStream(open('simplefile','rb'))) as stream: for obj in stream: print obj Abstracting out the details of serialization into the PickleStream lets us forget about the details of how we are writing to disk. All we care about is that the object will do the right thing when we call the write() method. The iteration protocol can be used for much more advanced purposes, but even with this example, it should be obvious how useful it is. While you could implement the reading behavior with a read() method, just using the stream as something you can loop over makes the code much easier to understand. Let s step back now and look at some of the other underscore methods. Two of the most common uses of underscore methods are to implement proxies and to implement your own container-like classes. Proxies are very useful in many programming problems. You use a proxy to act as an intermediary between a caller and a callee. The proxy class can add in extra behavior in a manner that is transparent to the caller. In Jython, you can use the __getattr__ method to implement attribute lookups if a method or attribute does not seem to exist. Listing 7-3. Ensuring the Tables Have Columns in the Same Order SELECT MemberID, LastName, FirstName, Handicap, MemberType FROM ClubC UNION SELECT MemberID, LastName, FirstName, Handicap, MemberType FROM ClubD vb.net ean 128 reader Create GS1 - 128 Bar Codes with VB . NET - RasterEdge.com
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