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Figure 14-12. SimpleWinServive controller Now let s add the ability for the service control application to start the Windows service. Once you have your Windows Form laid out, double-click the Start button so that you can edit the code for the start Windows service event handler. Here is the code: System::Void bnStart_Click(System::Object^ sender, System::EventArgs^ e) { serviceController1->Refresh(); if (serviceController1->Status == ServiceControllerStatus::Stopped) { serviceController1->Start(); MessageBox::Show("SimpleWinService Started"); } else { MessageBox::Show("SimpleWinService Running"); } } Yes, that s all it takes! Now let s take a closer look. The first thing you need to do is Refresh() the properties. If you don t, then the Status property will probably be out of sync with the actual Windows service. Then, before you call the Start() method, you need to make sure that the Windows services status is Stopped. Another option would be to enclose the Start() method in a try/catch block, as the Start() method throws an exception if the current start is not Stopped. I added the MessageBoxes so that you can verify all is well, but they are obviously not needed. Now let s stop the service: System::Void bnStart_Click(System::Object^ sender, System::EventArgs^ e) { serviceController1->Refresh(); if (serviceController1->Status == ServiceControllerStatus::Stopped) { serviceController1->Start(); MessageBox::Show("SimpleWinService Started"); } else { MessageBox::Show("SimpleWinService Running"); } } The code is nearly identical. In fact most of the handler trigger methods are handled this exact same way. There is one major exception: ExecuteCommand(). The ExecuteCommand() method allows you to trigger an event on the Windows service based on a numeric value between 128 and 255. Windows reserves the values 0 through 127. The implementation of the custom command is made up of two parts.

Another key ingredient in any two-binding scenario is validation in other words, logic that catches incorrect values and refuses them. You can build validation directly into your controls (for example, by responding to input in the text box and refusing invalid characters), but this low-level approach limits your flexibility. Fortunately, WPF provides a validation feature that works closely with the data binding system you ve explored. Validation gives you two more options to catch invalid values: You can raise errors in your data object. To notify WPF of an error, simply throw an exception from a property set procedure. Ordinarily, WPF ignores any exceptions that are thrown when setting a property, but you can configure it to show a more helpful visual indication. Another option is to implement the IDataErrorInfo interface in your data class, which gives you the ability to indicate errors without throwing exceptions.

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s You can elect not to publish an item by selecting either No or Refresh Only from the Publish and Tip

You can define validation at the binding level. This gives you the flexibility to use the same validation regardless of the input control. Even better, because you define your validation in a distinct class, you can easily reuse it with multiple bindings that store similar types of data. In general, you ll use the first approach if your data objects already have hardwired validation logic in their property set procedures and you want to take advantage of that logic. You ll use the second approach when you re defining validation logic for the first time and you want to reuse it in different contexts and with different controls. However, some developers choose to use both techniques. They use validation in the data object to defend against a small set of fundamental errors and use validation in the binding to catch a wider set of user-entry errors.

First you need to add a call to your Windows Form to ExecuteCommand(), passing it a number representing the command that you want the Windows service to execute. Here is the code for the button Interval 15. (The code for button Interval 20 is virtually the same except the numeric value passed in the ExecuteCommand() method.) System::Void bnIntv15_Click(System::Object^ sender, System::EventArgs^ e) { serviceController1->Refresh(); if (serviceController1->Status == ServiceControllerStatus::Running) { serviceController1->ExecuteCommand(150); MessageBox::Show("SimpleWinService Interval in 15 seconds"); } else { MessageBox::Show("SimpleWinService Not Running"); } } I m pretty sure you are starting to see a pattern forming on these event handlers. The second half the of the custom command is to add an OnCustomCommand() handler to your Windows service, which will process the numeric command sent by the ExecuteCommand() method. Here is an example that changes the interval time of the timer of the Windows service: virtual void OnCustomCommand(int cmd) override { if (cmd == 150) this->timer->Interval = 15000; else this->timer->Interval = 20000; } I used an if statement due to the fact that only two numeric values are being sent to the OnCustomCommand() handler. Normally, you would probably use a case statement on the cmd parameter. Normally, I include a full example of the source code, but I see no real added value in doing so for this example, as all the code is so trivial. But if you need the code example, it is available on the Apress and ProCppCLI.net Web sites.

s Note Validation applies only when a value from the target is being used to update the source in other

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