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A pinned pointer can point to a reference handle, a value type, and an element of a managed array. It cannot pin a reference type, but it can pin the members of a reference type. A pinned pointer has all the abilities of a native pointer, the most notable being pointer comparison and arithmetic. Listing 20-6 shows the pin_ptr<> keyword in action. Listing 20-6. pin_ptr in Action #include <stdio.h> using namespace System; ref class RTest { public: int i; RTest() { i = 0; } }; value class VTest { public: int i; }; #pragma unmanaged void incr (int *i) { (*i) += 10; } #pragma managed void incr (VTest *t) { t->i += 20; } void main () { RTest ^rtest = gcnew RTest(); pin_ptr<int> i = &(rtest->i); incr( i );

However, reliable messaging can also be something of a misnomer since it does not provide for durability, unless you consider MSMQ as the container..

// rtest is a reference type // i is a pinned int pointer // Pointer to managed data passed as // parameter of unmanaged function call

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For example, if the server application is down for a period of time longer than the timeout defined in the client application, the message will indeed never be delivered. Or if you persist messages to a durable store that is, you write these to the disk on the client side but no such strategy exists on the server side there really is no reliability. Although the implementation does in fact take into account the requirements for reliability, at least for version 1 of WCF, there is no real support for durability. The WS-ReliableMessaging specification specifies only that the receiving endpoint is required to send an acknowledgment that the message has indeed been received. Despite these limitations, in the scenario that both ends of the application that is, the client endpoint and the server endpoint are indeed up and running, reliable messaging offers you a host of advantages. The failures at the transport level are overcome, more often than not without writing a single line of additional code.

Console::WriteLine ( rtest->i );

The Password property is bound to a vanilla TextBox, which will display the contents of whatever the user types This is a security risk and should not be used in production code Instead, the PasswordBox automatically masks the user input to hide the value entered The trouble is, the PasswordBoxPassword property is not a dependency property, so it can t be the target of a binding..

VTest ^vtest = gcnew VTest; vtest->i = 0;

Implementing reliable messaging has multiple challenges. We ll broadly categorize them into communication issues and processing issues. More often than not, these are interrelated challenges that are nontrivial in nature to solve.

pin_ptr<VTest> ptest = &*vtest; // ptest is a pinned value type. // The &* says give the address of the // indirection of vtest incr( ptest ); // Pointer to value type passed as // parameter of unmanaged function call

Console::WriteLine ( vtest->i );

Communication issues typically revolve around the physical transport. In a service-oriented world, the quality of the communication layer is often not within our control. The main communication issues are the following: Network issues: The actual physical network is not available. So, what happens to your messages Do you compensate for this How do you compensate for this The server is down or the router is struggling to cope with high levels of network congestion. Connection drops: You send the message; however, the connection to the destination is lost before the message arrives at the destination. How do you detect the drop, and more important, how do you recover from this In this scenario, say your machine has the network cable unplugged or the wireless card on the laptop momentarily blinks. Prior to WCF, the messages would be lost, unless of course you had envisioned this and written lots of code to overcome the scenario. Lost messages: This is much like the load of laundry that loses one sock. You don t know what happened to your message. You sent it, the network was available, and your connection was stable, but for some reason the message didn t arrive at the destination. How do you prevent this situation Out-of-order messages: You put in a sell order for MSFT stock, the proceeds of which you want applied to the purchase of a really hot energy stock. Naturally the sell order needs to arrive before the purchase; otherwise, your account will not have the adequate funds to buy the energy stock. How do you go about avoiding this scenario

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