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The GetInitializer method in listing 10-2 will be called once for each Web service that this extension is applied to (assuming the extension is applied using webconfig as explained earlier) When GetInitializer is called, a connection string is read from the webconfig file and returned With each incoming request to the Web service, a new instance of the SoapSecurity class is created and Initialize is called The initializer parameter (the only parameter to Initialize) will be the connection string that was originally returned from GetInitializer The example in listing 10- 2 stores this connection string in the member variable _ConnStr for use during the four calls to ProcessMessage (not shown in this listing) Per-Web Method Intialization There are some cases when the initialization or configuration data you read will vary for each Web method For example, a usage accounting service might need to know whether it should log the time that the request completed (in addition to the time when the request came in) You could hardcode this information in the SOAP extension itself but that would severely limit its reusability Since we are trying to implement reusable Web services infrastructure, such information ought to be provided through external configuration When you apply a SOAP extension using custom CLR attributes (rather than webconfig), the extension gets a chance to perform an initialization for each Web method that it applies to When the Web method is invoked for the first time, ASPNET creates an instance of your Web service and calls the overloaded GetInitializer method this time passing it a LogicalMethodInfo object and a ServiceAttribute LogicalMethodInfo gives you access to the method s metadata such as its name and a list of parameters ServiceAttribute is an instance of your custom attribute that was used to apply the extension to the Web method Similar to per-service initialization, you return some object from GetInitialize and this object is passed back to Initialize for each new instance of your extension as shown in figure 10-3.

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The Canvas class has methods for handling portable action events (also known as game actions) from the low-level user interface The API defines a set of action events: UP, DOWN, LEFT, RIGHT, FIRE, GAME_A, GAME_B, GAME_C, and GAME_D The device maps the action events to suitable key codes on the device; multiple keys may map to each game action For example, a device with four navigation keys and a SELECT key in the middle could use those keys for mapping the action events, but it may also use the keys on the numeric keypad (such as 2, 4, 5, 6, and 8)

The final parameter, lpdwDisposition, provides a return value with information about whether a key already exists or was created Our library, YaoDurantWin32Rapidll, has an enumeration that contains the two possible values for this parameter:

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Figure 10-3 How per-web method initialization works Receiving the custom attribute as a parameter allows the developer using your extension to easily pass you configuration information Consider for example the SoapSecurityAttribute in listing 10-3

public enum REGDISP { REG_CREATED_NEW_KEY = 0x00000001, REG_OPENED_EXISTING_KEY = 0x00000002, }

Listing 10-3 The SoapSecurityAttribute is used to apply a SOAP extension to Web methods (VBWSBook\10\Infrastructure\SoapSecurityvb)

An application should determine the appropriate action for a given key code by calling the method CanvasgetGameAction If the logic of the application is based on the values returned by this method, the application is portable and runs regardless of the keypad design

<AttributeUsage(AttributeTargetsMethod)> _ Public Class SoapSecurityAttribute Inherits SoapExtensionAttribute

Once a key has been opened, you can read registry values by calling the CeRegQueryValueEx function and write values with the CeRegSetValueEx function We have several definitions for each function to accommodate different types integer, string, and binary that can be written to the registry (these definitions are for the most common types) Listing 99 shows the P/Invoke wrappers for various overloads that we define to call the CeRegQueryValueEx function

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The mapping between keys and the abstract action events does not change during the execution of an application One of the device-specific key codes mapped to a particular action can be retrieved with the method CanvasgetKeyCode However, since several keys may be mapped to a single action, comparing key events to these key codes is not recommended and CanvasgetGameAction should be used instead

Public Sub New(ByVal RequestedPermissions As String) _Permissions = RequestedPermissions _Priority = 1 End Sub

[DllImport("rapidll", CharSet=CharSetUnicode)] public static extern int CeRegQueryValueEx (IntPtr hKey, string lpValueName,

End Get Set(ByVal Value As String) _Permissions = Value End Set End Property Public Overrides Property Priority() As Integer Get Return _Priority End Get Set(ByVal Value As Integer) 'ingore this End Set End Property Public Overrides ReadOnly Property ExtensionType() As SystemType Get Return GetType(SoapSecurity) End Get End Property End Class

connectivity to some kind of network, often with a wireless, intermittent connection and with limited (often 9600 bps or less) bandwidth

int lpReserved, ref REGTYPE lpType, IntPtr iptrData, ref int lpcbData); [DllImport("rapidll", CharSet=CharSetUnicode)] public static extern int CeRegQueryValueEx (IntPtr hKey, string lpValueName, int lpReserved, ref REGTYPE lpType, string strData, ref int lpcbData); [DllImport("rapidll", CharSet=CharSetUnicode)] public static extern int CeRegQueryValueEx (IntPtr hKey, string lpValueName, int lpReserved, ref REGTYPE lpType, ref int piData, ref int lpcbData);

The interesting aspect of SoapSecurityAttribute is that its constructor takes in a string parameter and stores it in the _Permissions request variable This means a developer using your extension can specify the permission that a Web method requires like this:

<WebMethod(), SoapSecurity("Temperature")> _ Public Function GetTemperature()

As before, set parameters with Reserved in the name to 0 The fourth parameter to CeRegQueryValueEx is a REGTYPE reference, a value from the following enumeration:

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