winforms data matrix

winforms data matrix

winforms data matrix

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I guess I m kind of obligated to cover socket options here, as I did mention them in the caution way up near the start of the chapter. In most programs you write, you will not normally have to worry about the options on a socket. In fact, nearly all of the options are beyond the scope of this book. But, on those occasions that the defaults need to be tweaked or retrieved, the Socket class provides you with the aptly named methods SetSocketOption() and GetSocketOption(). The SetSocketOption() method has four different overloads. The reason is that different options require different data types to be set. Thus, each overload provides one of these data types: void SetSocketOption(SocketOptionLevel, SocketOptionName, Boolean) void SetSocketOption(SocketOptionLevel, SocketOptionName, array<Byte>^) void SetSocketOption(SocketOptionLevel, SocketOptionName, int) void SetSocketOption(SocketOptionLevel, SocketOptionName, Object^) As you can see, each of these methods has two parameters in common: SocketOptionLevel, which specifies what level of socket to apply the set to (IP, IPv6, Socket, Tcp, or Udp), and SocketOptionName, which specifies which option to set. There are quite a few options that you can tweak, if you feel adventurous. I only recall using Linger, which keeps the socket open if unsent data exists, and ReceiveTimeout, which specifies how long to wait on a receive command before giving up and throwing an exception. The GetSocketOption() method is also overloaded but only three times: object GetSocketOption(SocketOptionLevel, SocketOptionName) void GetSocketOption(SocketOptionLevel, SocketOptionName, array<Byte>^ value) array<Byte>^ Socket::GetSocketOption(SocketOptionLevel, SocketOptionName, int)

The test results from a data-driven test look slightly different than those you ve seen so far, as shown in Figure 12-15.

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Just like the SetSocketOption() method, the first two parameters are SocketOptionLevel and SocketOptionName. In most cases, you use the first version of the GetSocketOption() method, but for those options that deal in byte arrays the other two versions are also available. Listing 19-11 is an example of using the ReceiveTimeout option with UDP. You might find this option helpful if you want a simple way to help check that a package was sent successfully, by way of having the receiver of the package immediately send back an acknowledgment package. Since you have a timeout set on the ReceiveFrom() method, if the acknowledgment package doesn t come back in a timely fashion you know one of two things: the package was never received or the acknowledgment package was lost. (I never said it would check that the package was sent successfully, but only that it would help in checking.) Listing 19-11. A UDP Client with a Timeout using using using using namespace namespace namespace namespace System; System::Net; System::Net::Sockets; System::Text;

void main() { Socket^ socket = gcnew Socket(AddressFamily::InterNetwork, SocketType::Dgram, ProtocolType::Udp);

Figure 12-15. Data-driven test results For each row in the test, the result and the amount of time the test took are displayed. If there were any errors, those messages will be displayed here as well.

This is where the selection in the popover finally ends up having an effect. The font is now set according to what the user picked. You should now be able to build and run the app, and then touch the font list button in the toolbar to see something like the popup shown in Figure 6 3. Try selecting a different font, and then using the Text tool to create some text. Neat! You now have the full complement of fonts included with the iPad at your disposal. You re still stuck with just one size, so let s tackle that next.

EndPoint^ Remote = gcnew IPEndPoint(IPAddress::Parse("127.0.0.1"), 54321); if ((int)socket->GetSocketOption(SocketOptionLevel::Socket, SocketOptionName::ReceiveTimeout) < 5000) { socket->SetSocketOption(SocketOptionLevel::Socket, SocketOptionName::ReceiveTimeout, 5000 ); } while (true) { Console::Write("Message ('q' to quit): "); String^ input = Console::ReadLine(); if (input->ToLower()->Equals("q")) break; array<unsigned char>^ message = Encoding::ASCII->GetBytes(input); socket->SendTo(message, Remote); message = gcnew array<unsigned char>(1024); try { int recv = socket->ReceiveFrom(message, Remote); Console::WriteLine("[{0}] {1}", Remote->ToString(), Encoding::ASCII->GetString(message, 0, recv)); }

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