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It s common practice for a C language application to use fixed-sized buffers to store data, both in memory and on disk. A fixed-sized buffer of some primitive type such as int or char is easy and quick to populate the data that s needed to populate the entire buffer can be copied over the entire buffer using the C runtime memcpy or an equivalent command, populating all the elements in the buffer in a single operation. The simplicity and speed of accessing fixed-sized buffers comes at a considerable cost in terms of code correctness and security and is notorious as the source of many serious security breaches, which is why .NET uses a different model. In the .NET model, all access to elements in a buffer is checked, and because arrays are reference types, an array declared as part of a structure doesn t physically live inside the structure. Instead, a reference to the array is placed inside the structure, which points to the location of the array on the heap. This means that a memcpy or equivalent wouldn t work (even if legal), as the memory inside the buffer isn t laid out in memory correctly. This causes headaches and inefficiencies when dealing in heavy interop scenarios. In C# 2.0, it s now possible to overcome this problem with an extension to the fixed keyword, which allows arrays to be declared as fixed-sized inside unsafe code blocks. Fixed arrays will typically be part of a structure that s passed to a native API. The Windows API function GetVersionEx is a good example of an API where you can use fixed-sized buffers. The single parameter that s passed to the function is a pointer to an OSVERSIONINFO structure defined in C as follows: typedef struct _OSVERSIONINFO { DWORD dwOSVersionInfoSize; DWORD dwMajorVersion; DWORD dwMinorVersion; DWORD dwBuildNumber; DWORD dwPlatformId; TCHAR szCSDVersion[128]; } OSVERSIONINFO; Although you could call this function without fixed-sized buffers by using marshalling attributes, you ll receive a performance penalty. To convert this structure to a C# struct, use the following declaration:
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CHAPTER 3: Doing Several Things at Once: Performance Enhancements with Threading
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<ResourceDictionary Source="/ PresentationFramework.Luna, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35 ;component/themes/ luna.homestead.xaml" />
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Listing 3-6. Delegate Methods for NSURLConnection // NSURLConnection delegate method - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { // This method may be called repeatedly [receivedData appendData:data]; } // NSURLConnection delegate method - (void)connectionDidFinishLoading:(NSURLConnection *)connection { // This method will be called once, if no errors occurred. //All data has been received and the connection is closed. // Call any methods that process the received data (e.g. XML parsing) here. [receivedData release]; receivedData = nil; [myConnection release]; myConnection = nil; } // NSURLConnection delegate method - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { // This method is called once, if an error occurred. // The error argument contains information about the error. [receivedData release]; receivedData = nil; [myConnection release]; myConnection = nil; }
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he information in the preceding chapters is sufficient for writing objects that will function in the .NET runtime, but those objects won t feel like they were written to operate well in the .NET Framework. This chapter details how to make user-defined objects operate more like the objects in the .NET runtime and the .NET Framework.
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Figure 5-10. Console output showing the model information
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firstPress: LINQ to ADO.NET
create a data context, PeopleDataContext, and a Table collection, People (for the Person database table), available in that context. A new generic collection class, Table(Of T), in the System.Data.DLinq namespace, is used to represent database tables. We used the data context s GetTable(Of T) method to create a People object of type Table(Of Person) in the PeopleDataContext context. The argument to the DataContext constructor is the same thing you provide an ADO.NET connection. Here is an example:
Now it s time to add relationships, so that each object can be attached to other relevant objects. We re going to define a one-to-many relationship from MythicalBand to MythicalPerson, a one-to-many relationship from MythicalBand to MythicalGig, and finally another one-to-many relationship from MythicalVenue to MythicalGig. See Figure 8 4 for an overview.
There may be times that you want to turn off your 3G radio and only use the slower 2G connection. One reason might be that you do not need the speed of 3G, and you want to make your battery last longer. Another reason might be that you are in an area that has only 2G connectivity. The 2G connection, which shows up as the letter E next to your wireless carrier in the status bar, uses less battery power than the 3G connection. 1. 2. 3. 4. 5. Tap the Settings icon. Tap General. Tap Network. Set the switch next to Enable 3G to Off. When you do this, you will see the 3G in the status bar change to an E.
Anchor Points Demystified
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With this query, we ve selected the title, publisher, and authors out of the XML file. We ve done extra work to format the list of author names as a commaseparated list to match our desired output format. Now that we have our functional construction statements and our query, it s time to combine the two into a single LINQ to XML transformation. See listing 10.25.
Listing 1-39. An Empty Person Sequence Produced by the Empty(Of T) Method
Mapping objects to relational data
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