winforms pdf 417

winforms pdf 417

winforms pdf 417

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The comma operator causes a sequence of expressions to act as a single expression, with the last expression ultimately becoming what the total expression evaluates to. You can place a series of comma-delimited expressions anywhere you can place a normal expression. You will probably see the comma operator most frequently used in the initialization and increment sections of a for loop, but there is nothing stopping a programmer from using it elsewhere. I discuss for loops later in this chapter. The following example, though completely contrived, shows the comma operator in action. First, b is incremented, then a is assigned the value of multiplying post incremented a and b, and finally, c is assigned the value of a modulus b: int a = 2; int b = 3; int c = (b++, a = b++ * a++, a % b); The values of the variables after this code snippet finishes are a = 9 b = 5 c = 4

Note Figure 12-16 shows the file during an actual manual test run so it is not displayed in the Word environment here. This test is not a test you will be running, but is for example purposes only.

Eleven assignment operators are available to C++/CLI, as shown in Table 2-17.

Assign Add, then assign Subtract, then assign Multiply, then assign Divide, then assign Modulus, then assign Shift right, then assign Shift left, then assign AND, then assign XOR, then assign OR, then assign

// FontSizeController.h #import <UIKit/UIKit.h> @interface FontSizeController : UIViewController { IBOutlet UITextView *textView; IBOutlet UISlider *slider; IBOutlet UILabel *label; UIFont *font; } @property (retain, nonatomic) UIFont *font; - (void)takeIntValueFrom:(id)sender; @end

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The test steps are the key to this test. The tester simply walks through the steps of the test performing the actions noted in the step description. The result of each step should be documented in the far-right column. If the expected result is not the actual result at any point in the set of steps, the test should be marked as failed and a comment explaining which step failed and the actual result that was displayed. The version history should also be maintained so you know who made changes, if any, to the test script.

As with synchronous connection-oriented code, you need to set up a Socket or TcpListener so that it can accept connections. There is no asynchronous method for the process of creating a socket or TcpListener; therefore, you use the same code as you did for your synchronous code. This makes sense because this code is not dependent on a remote client. The first step, in which a server starts to communicate with a client (an extensive wait may occur while this communication process occurs), is the accept stage. You have three options when accepting connections: The Socket class s BeginAccept() method The TcpListener class s BeginAcceptSocket() method The TcpListener class s BeginAcceptTcpClient() method

All three of these methods have overloaded parameter sets similar to their synchronous equivalent, with the addition of two more parameters: a handle to the AsyncCallback method, which gets executed when the connection acceptance completes, and a handle to an Object class to hold information to pass from the begin method to the end method In addition, all three methods also return a handle to an IAsyncResult class (You probably will not need to use this return value) To invoke the BeginAccept() method, you must first create a socket and the AsyncCallback method to handle the results of the accept operation You have seen the steps to create a socket earlier (in our discussion of connection-oriented sockets), so I won t repeat myself here Creating an AsyncCallback, on the other hand, is new The AsyncCallback has two constructors.

When a test run reaches a manual test, it will pause and wait for you to complete the manual test. When you have finished with the manual test, you mark it as Pass or Fail using the options at the top of the manual test window, and then click Apply. Once the test is marked as Pass or Fail, the rest of the tests in the test run will continue.

Which you use depends on whether the actual callback method is a static method: AsyncCallback^ method = gcnew AsyncCallback(&TcpServer::AcceptCB); or a member method: AsyncCallback^ method = gcnew AsyncCallback(server, &TcpServer::AcceptCB); Normally, you will just embed this code directly in the BeginAccept() method call like this: socket->BeginAcceptSocket(gcnew AsyncCallback(&TcpServer::AcceptCB), socket); The actual callback method (AcceptCB in this case) looks like this: void TcpServer::AcceptCB(IAsyncResult^ iar) { //.. } where AcceptCB is declared as one of the following: public: void AcceptCB(IAsyncResult^ iar); or public: static void AcceptCB(IAsyncResult^ iar); When the BeginAccept() method is called, it creates a new thread to wait on the completion of a socket accept and then lets the original thread continue on its merry way.

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