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extern "C" __declspec(dllimport) double XYZGetData(HXYZ hxyz); The extern "C" linkage modifier is neither allowed nor necessary in P/Invoke functions. In C++, it is used to ensure that global functions can be called from C code. When generating a managed-to-unmanaged thunk from a P/Invoke function, the JIT compiler automatically looks for functions without mangled names in the target DLL. You can replace the __declspec(dllimport) specification by applying the DllImportAttribute with the name of the target DLL to the P/Invoke function. [DllImport("XYZLib.dll")] ... function declaration goes here ... Key to enabling the features of SafeHandle is the replacement of the native handle type with XYZHandle^ a tracking handle to the SafeHandle-derived handle class. To avoid naming conflicts with the global functions from the native API, the P/Invoke functions are defined as private static member functions of the native class: public ref class XYZConnection { [DllImport("XYZLib.dll")] static XYZHandle^ XYZConnect(); [DllImport("XYZLib.dll")] static double XYZGetData(XYZHandle^ xyzHandle); ... rest of class definition }; The two P/Invoke functions defined here provide custom marshaling. XYZConnect returns an XYZHandle^. The managed-to-unmanaged thunk for this function performs several steps: 1. It creates a new instance of XYZHandle. This instance will later be passed as the return value to the managed caller. 2. It starts a CER. 3. In this CER, it calls the native function. 4. In this CER, it assigns the returned handle to the XYZHandle object created in step 1. 5. It finishes the CER. The managed-to-unmanaged thunk for the function XYZGetData does not need to start a CER, because it does not assign a native handle to an XYZHandle object. Instead, it simply marshals the XYZHandle^ argument to a native HXYZ type. The following code shows the complete class definition. Notice that the constructor initializes the xyzHandle field by calling the P/Invoke function XYZConnect. // ManagedWrapper4.cpp ... definition of XYZHandle shown earlier ... ...
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As mentioned earlier, it is illegal to call a finalizable object in a finalizer, because it is possible that the finalizable object has been finalized already. You must not make assumptions about the order in which objects are finalized with one exception. In the namespace System::Runtime::ConstrainedExecution, there is a special base class called CriticalFinalizerObject. Finalizers of classes that are derived from CriticalFinalizerObject are guaranteed to be called after all finalizers of classes that are not derived from that base class. This leaves room for a small refinement of the finalization restriction. In non-critical finalizers it is still illegal to call other objects with non-critical finalizers, but it is legal to call instances of types that derive from CriticalFinalizerObject. The class System::IO::FileStream uses this refinement. To wrap the native file handle, FileStream uses a handle wrapper class that is derived from CriticalFinalizerObject. In the critical finalizer of this handle wrapper class, the file handle is closed. In FileStream s noncritical finalizer, cached data is flushed to the wrapped file. To flush the cached data, the file handle is needed. To pass the file handle, the finalizer of FileStream uses the handle wrapper class. Since the handle wrapper class has a critical finalizer, the FileStream finalizer is allowed to use the handle wrapper class, and the file handle will be closed after FileStream s non-critical finalizer has flushed the cached data.
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The rule will also be applied if ValidationRules.CheckRules() is called with no parameters, as that causes the validation rules for all properties to be checked.
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ASP .NET 2.0 supports the concept of themes for a website, where the visual appearance of the site is defined by a theme: a group of files in a theme-specific subdirectory beneath the App_Themes directory in the virtual root. A theme is a group of style sheets, graphics, and control skins that describe the appearance of a site. A given site can have many themes, and you can even allow the user to choose between them if you so desire. Notice how all of the regions in the master page are set up using div tags. No appearance characteristics are specified in the page itself. Instead, the actual appearance is defined by a CSS style sheet contained within the current theme for the site. The PTWeb site includes and uses a Basic theme. The use of the Basic theme is set up in web.config: <pages theme="Basic" styleSheetTheme="Basic"> The theme property sets the default runtime theme, while styleSheetTheme sets the theme for use at design time in Visual Studio. The styleSheetTheme property should be removed when the website is deployed to a production server. The files defining this theme are in the App_Themes/Basic folder beneath the virtual root. You should notice that the names of the css and skin files match the name of the theme folder itself. Having the names match allows ASP.NET to automatically realize that it needs to use these files when the theme is selected for the website. The files in this theme are listed in Table 10-4. Table 10-4. Files in the Basic Theme
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As we talk about routing, we are actually talking about both routing and referral. The term routing refers to the infrastructure that enables SOAP messages to be forwarded on to other destination endpoints. The term referral describes the physical act of forwarding a message on. It is common practice to use the term routing to describe the combined process of routing and referral.
Use of the cursor_sharing parameter is only a workaround and not a solution. Setting this parameter to force has minor side effects such as an increase in CPU utilization due to increased soft parsing.
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