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vb.net upc-a reader

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Of course, declaring pointers to local variables simply to assign their value (as shown in the previous example) is never required and not altogether useful. To illustrate a more practical example of unsafe code, assume you wish to build a swap function using pointer arithmetic: unsafe public static void UnsafeSwap(int* i, int* j) { int temp = *i; *i = *j; *j = temp; } Very C-like, don t you think However, given your work in 3, you should be aware that you could write the following safe version of your swap algorithm using the C# ref keyword: public static void SafeSwap(ref int i, ref int j) { int temp = i; i = j; j = temp; } The functionality of each method is identical, thus reinforcing the point that direct pointer manipulation is not a mandatory task under C#. Here is the calling logic: static void Main(string[] args) { Console.WriteLine("***** Calling method with unsafe code *****"); // Values for swap. int i = 10, j = 20; // Swap values 'safely'. Console.WriteLine("\n***** Safe swap *****"); Console.WriteLine("Values before safe swap: i = {0}, j = {1}", i, j); SafeSwap(ref i, ref j); Console.WriteLine("Values after safe swap: i = {0}, j = {1}", i, j); // Swap values 'unsafely'. Console.WriteLine("\n***** Unsafe swap *****"); Console.WriteLine("Values before unsafe swap: i = {0}, j = {1}", i, j); unsafe { UnsafeSwap(&i, &j); } Console.WriteLine("Values after unsafe swap: i = {0}, j = {1}", i, j); Console.ReadLine(); }

vb.net upc-a reader

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ebugging technique is an often overlooked part of a developer s set of skills. In this chapter, we are going to explore some debugging techniques that will save you time when troubleshooting your code, and make you a more efficient coder. Error handling is another area in which we often find ourselves taking shortcuts. We will also look at error handling methods in this chapter, and we'll see how to deliver user-friendly messages to our users.

Field Access via Pointers (the -> Operator)

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Now assume that you have defined a Point structure and wish to declare a pointer to a Point type. Like C(++), when you wish to invoke methods or trigger fields of a pointer type, you will need to make use of the pointer-field access operator (->). As mentioned in Table 9-3, this is the unsafe version of the standard (safe) dot operator (.). In fact, using the pointer indirection operator (*), it is possible to dereference a pointer to (once again) apply the dot operator notation. Check out the following: struct Point { public int x; public int y; public override string ToString() { return string.Format("({0}, {1})", x, y);} } static void Main(string[] args) { // Access members via pointer. unsafe { Point point; Point* p = &point; p->x = 100; p->y = 200; Console.WriteLine(p->ToString()); } // Access members via pointer indirection. unsafe { Point point; Point* p = &point; (*p).x = 100; (*p).y = 200; Console.WriteLine((*p).ToString()); } }

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<h1 id="logo"> <a href="/" title="return to the homepage">My Snazzy Logo</a> </h1> and your rules something like this: #container { position:relative; } h1#logo { position:absolute; left:15px; top:20px; margin:0;padding:0; } but for some strange reason known only to the developers of IE 6 (and possibly not even them), the logo vanishes from the screen entirely when viewed in that browser (it happens) You don t have time to figure out why IE is shifting your client s logo into space you just need to get it fixed and move on After a few rounds of trial and error, you discover that changing to position:relative and using a bottom margin of negative-170px puts the logo back in its proper place in IE Weird.

To conclude this introductory look at WCF programming, it is well worth pointing out that the .NET Framework 3.0 SDK ships with the SvcConfigEditor.exe tool (the Microsoft Service Configuration Editor), which allows you to create and edit host-side and client-side configuration files from a friendly graphical editor. While it is always a good idea to know how to author and modify *.config file by hand, the Service Configuration Editor will save you a great amount of time (and possible typos). Once you launch this tool, you can proceed to the File menu and choose an existing *.config file you wish to update, or you can select a WCF executable to generate a new (properly named) application file (see Figure 28-9).

Figure 28-9. Selecting a target for configuration For this example, I suggest opening the host s existing *.config file. Assuming this is the case, you can now select endpoints, behaviors, and diagnostic options for editing using a related Properties window. For example, if you want to change the binding attribute of an endpoint to netNamedPipeBinding, simply select this option from the drop-down (see Figure 28-10).

vb.net upc-a reader

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