vb net barcode scanner BUILDING C++/CLI PROGRAMS in visual C#

Connect pdf417 in visual C# BUILDING C++/CLI PROGRAMS

This chapter demonstrates how an existing real-world application, the YAZD forum software, can swiftly be converted into a portlet application using the techniques described in earlier chapters.
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CHAPTER 11: Advanced Build Techniques
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Using Common Methods
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In this target, you can see that the output for both syntaxes certainly differs. Now let s examine it a bit closer. The task call that generated the first section is <Message Text="@ (Compile->'% (Filename)'): @(Compile->'%(Filename)')"/>. This call generated a single string to be output to the console. That was all of the names of the Compile files separated by the default semicolon delimiter. This is the behavior of the @ syntax. You specify the item that you are acting upon, and then you pass the optional metadata name that you want returned. The Filename metadata reference name is not defined in the project file; it is well-known metadata. (We discussed well-known metadata earlier in the chapter.) No matter what item you pass in, the result will act upon the group, not the individual items. Contrast this to the behavior of using the % syntax; for each item in the Compile list, the last Message task is executed. Thinking in terms of typical build steps, you will most likely be using the % syntax when dealing with files. On the other hand, if you are passing the item to a custom task, you will most likely send the entire item as a list. The task will then decompose the list and act upon the individual items if necessary. The @ notation signifies you are acting upon an array of items and that you would like to process each item in the list individually. The -> notation is called a transform. A transform is a one-to-one mapping from one item into another. In this sample, you transformed the element to provide the filename of the included file. You can also perform multiple transformations at once. For instance, how could you get the filename and extension into your lists Let s create a new target from a modified version of the previous target. This target, VectorScalar3, is as follows. Also, you will see an added call to the Message task to further clarify the use of these transformations. <Target Name="VectorScalar3"> <Message Text="%40(Compile->'%25(Filename)%25(Extension)'): @(Compile->'%(Filename)%(Extension)')"/> <Message Text=" "/> <!-- Empty line for readability --> <Message Text="%25(Compile.Filename)%25(Extension): %(Compile.Filename)%(Extension)"/> <Message Text=" "/> <!-- Empty line for readability -->
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Figure 3-3. Writing a query
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F# also has the notion of a flexible type constraint, which is shorthand for a generic function and a constraint on the type variable. You could equally write this: > open System.Windows.Forms;; > let setTextOfControl (c : 'T when 'T :> Control) (s:string) = c.Text <- s;; val setTextOfControl: #Control -> string -> unit
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The actual assignment occurred after the call to conn.Open() in this particular example, but you could have done it before calling Open(); the connection doesn t have to be open for the Connection property of the command to be set. As mentioned earlier, you have a second option for associating a connection with a command; calling the connection s CreateCommand method will return a new command with the Connection property set to that connection.
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A firewall is a device or software that is designed to inspect traffic, and permit, deny, or proxy it. Firewalls can be a dedicated appliance or software running on a host operating system. Firewalls function in a networked environment to prevent specified types of communication, filtering the traffic you want to be able to receive from the traffic you do not want to receive. Mac OS X has a built-in software firewall that you can use to limit incoming traffic. This will allow you to control traffic in a way that keeps attacks at a minimum. In 11 we discuss the software firewall in more depth. Many firewalls will help reduce the likelihood of Denial of Service attacks against one of your computers. However, some firewalls are susceptible to these attacks themselves, opening your environment to the threat of not being able to do business. To help with this, most firewalls support the ability to have a fail-over firewall. A fail-over firewall can automatically become the active firewall in situations where the main firewall goes down.
Let s take a look at installing a program from source. Dillo is a stripped-down web browser that s designed for speed and small file size. It s a fun little program that s good to have around in the event of your main browser developing a glitch that you can t fix. The Dillo home page is www.dillo.org, so head over there, and choose to download the latest version of the source code.
The System.Runtime.Remoting.Metadata namespace includes classes and attributes for controlling the processing and serialization of objects and fields when using SOAP as your message format. These classes can be used for specifying XML element and attribute names for serialization as well as controlling the SOAP header itself. The attributes explained in this section and introduced in this namespace provide similar functionality to the attributes introduced with the XML serialization (System.Xml.Serialization), which is used for XML and Web Services. The attributes introduced in this section are used for the first time in the book in 8.
Figure 10-4. The BinaryFormatter version incompatibility information in TcpTrace
As it happens, multiplication on complex numbers is easier to express using polar coordinates, implemented as follows: let mulViaPolar a b = match a, b with | Polar (m, p), Polar (n, q) -> Complex.Polar (m*n, p+q) Here is an example of using the (|Rect|) and (|Polar|) active patterns directly on some complex numbers via the pattern tags Rect and Polar. You first make the complex number 3+4i: > let c = Complex (3.0, 4.0);; val c : complex > c;; val it : complex = 3.0r+4.0i > match c with | Rect (x, y) -> printfn "x = %g, y = %g" x y;; x = 3, y = 4 val it : unit = () match c with | Polar (x, y) -> printfn "x = %g, y = %g" x y;; x = 5.0, y = 0.927295 val it : unit = () > addViaRect c c;; val it : complex = 6.0r+8.0i > mulViaRect c c;; val it : complex = -7.0r+24.0i > mulViaPolar c c;; val it : complex = -7.0r+24.0i As you may expect, you get the same results if you multiply via rectangular or polar coordinates. However, the execution paths are quite different. Let s look closely at the definition of mulViaRect. The important lines are in bold here: let mulViaRect a b = match a, b with | Rect (ar, ai), Rect (br, bi) -> Complex (ar*br - ai*bi, ai*br + bi*ar) When F# needs to match the values a and b against the patterns Rect (ar, ai) and Rect (br, bi), it doesn t look at the contents of a and b directly. Instead, it runs a function as part of pattern matching (which is why they re called active patterns). In this case, the function executed is (|Rect|), which produces a pair as its result. The elements of the pair are then bound to the variables ar and ai. Likewise, in the definition of mulViaPolar, the matching is performed partly by running the function (|Polar|). The functions (|Rect|) and (|Polar|) are allowed to do anything, as long as each ultimately produces a pair of results. Here are the types of (|Rect|) and (|Polar|): >
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