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In Standard Module1 in the DebugExample01.xlsm file, add the code from Listing 7-6. Listing 7-6. Sample Code for Debugging Function TestLoop() As Long Dim i As Integer Dim lngResult As Long lngResult = 1 For i = 1 To 10 lngResult = lngResult * i ExternalProcess lngResult Next i TestLoop = lngResult End Function Sub ExternalProcess(TheValue As Long) If TheValue > 10000 Then TheValue = 0 End If End Sub We re going to use this code to explore the various ways we can step through our code line by line, and we ll also see how to make use of additional tools like the Immediate window and the call stack. The code in Listing 7-6 is a simulation of a construct we see often in our code. In the TestLoop function, we have a loop that runs a fixed number of times (in real-life situations, this may or may not be the case) and returns a value at the end of the process. Within that loop, we call a procedure to act on or process data or perform an action based on the value of variables in the loop. In this case, we have the appropriately named ExternalProcess subroutine. Our TestLoop function is designed to multiply a value by the loop counter; the expected result of our process is the value 3628800. The ExternalFunction procedure is purposely coded to give an incorrect result. Let s run the code. 1. Open the VBE. 2. Show the Immediate window by choosing View Immediate Window or by pressing Ctrl+G. 3. In the Immediate Window, type testloop. The result is shown in Figure 7-15. vb.net barcode reader from image VB . NET Barcode Reader - How to Scan & Read Barcode in VB . NET ...
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I recommend Inlite's ClearImage barcode recognition SDK which has ... -SDK/Barcode-NET-VB-CSharp-SDK.aspx?tabid=104&prodid=10 it's a ... Now that you have a better feeling for the differences between value types and reference types, let s examine a more complex example. Assume you have the following reference (class) type that maintains an informational string that can be set using a custom constructor: class ShapeInfo { public string infoString; public ShapeInfo(string info) { infoString = info; } } Now assume that you want to contain a variable of this class type within a value type named MyRectangle. To allow the outside world to set the value of the inner ShapeInfo, you also provide a custom constructor (as explained in just a bit, the default constructor of a structure is reserved and cannot be redefined): struct MyRectangle { // The MyRectangle structure contains a reference type member. public ShapeInfo rectInfo; public int top, left, bottom, right; free code 39 barcode font excel, asp.net ean 13, asp.net upc-a reader, .net qr code library open source, word ean 128, c# imagemagick pdf to tiff vb.net barcode scanner webcam VB . NET Barcode Reader - How to Scan & Read Barcode in VB . NET ...
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VB.NET Barcode Reader & Scanner Library, tutorial for reading & recognizing barcodes using VB.NET class library for .NET, C#, VB.NET, ASP.NET web ... public MyRectangle(string info) { rectInfo = new ShapeInfo(info); top = left = 10; bottom = right = 100; } } At this point, you have contained a reference type within a value type. The million-dollar question now becomes, what happens if you assign one MyRectangle variable to another Given what you already know about value types, you would be correct in assuming that the integer data (which is indeed a structure) should be an independent entity for each MyRectangle variable. But what about the internal reference type Will the object s state be fully copied, or will the reference to that object be copied Ponder the following code and check out Figure 3-14 for the answer. static void Main(string[] args) { // Create the first MyRectangle. Console.WriteLine("-> Creating r1"); MyRectangle r1 = new MyRectangle("This is my first rect"); // Now assign a new MyRectangle to r1. Console.WriteLine("-> Assigning r2 to r1"); MyRectangle r2; r2 = r1; // Change values of r2. Console.WriteLine("-> Changing all values of r2"); r2.rectInfo.infoString = "This is new info!"; r2.bottom = 4444; // Print values Console.WriteLine("-> Console.WriteLine("-> Console.WriteLine("-> Console.WriteLine("-> Console.WriteLine("-> } vb.net barcode scanner source code Barcode Generator & Scanner in VB 2015 - YouTube
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If you buy barcode - scanners with an USB -connector, they will have ... The VB . NET -code is an automatic translation from C# and may contain ... Don t expect us to settle the debate of the perfect width here we re going to sit on that proverbial fence and simply present the evidence before you. Here are the issues: Readability: How easily can a block of text be read on screen, and what effect does resizing the screen or font size have Adaptability/portability: How easily can the design be used on a small screen (e.g., a small PC monitor or a device such as a PDA) Future maintainability: The more technically clever the design, the greater the difficulty in building something that another developer could later take on and support (if they are not at the CSS ninja status that you are soon to achieve!). Values after change:"); r1.rectInfo.infoString: {0}", r1.rectInfo.infoString); r2.rectInfo.infoString: {0}", r2.rectInfo.infoString); r1.bottom: {0}", r1.bottom); r2.bottom: {0}", r2.bottom); Figure 3-14. The internal references point to the same object! Figure 7-15. The TestLoop function returns an incorrect value. Let s begin debugging by inserting a breakpoint in our code. 1. In the code window, find the TestLoop function. 2. Move the mouse pointer to the gray left margin next to the start of the For...Next loop, and click. A maroon break marker is inserted, as shown in Figure 7-16. As you can see, when you change the value of the informational string using the r2 reference, the r1 reference displays the same value. By default, when a value type contains other reference types, vb.net barcode scan event VS 2013 [RESOLVED] Barcode scanner (LS2208) read barcode -VBForums
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