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Following the DLL s name are six optional named parameters, which further help the CLR P/Invoke process access the DLL and implement the unmanaged function. The named parameters are as follows.

Click Next twice, and then click Finish. At this point you ll have two resources generated in the virtual directory root a web.config file and a service host file called OldHorse2.PositionManagement.svc.

CallingConvention is an enumeration that defines the calling convention used when passing arguments to the unmanaged function. The default is StdCall, where the callee cleans the stack. Other valid values are Cdecl, where the caller cleans the stack ThisCall, where the first parameter is the this pointer and is stored in the register ECX and other parameters are pushed on the stack winapi, where the default platform calling convention is used FastCall, which is not currently supported

Note In VSTS version 1, rules cannot be pulled from a central area. You need to deploy the custom FxCop

Once again, create a Visual Studio 2010 console application, and choose Add Service Reference to add to the project using the URI shown in Figure 10 16.

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CharSet is an enumeration that defines how strings and characters are marshaled (handled). The default is Ansi. Other values are Unicode and Auto, which use the format appropriate for the platform. Normally, you should use Auto. Another feature of CharSet is it can be used to modify the name of the unmanaged function before it is looked up in the export list of the DLL. A number of Windows methods add an A for ANSI version and W for Unicode version to the end of the function name; for example, MessageBoxA and MessageBoxW. When you add the CharSet named parameter to the DllImportAttribute, the CLR s P/Invoke process appends the appropriate value for you. You saw this in action in Listing 21-3 and it explains why you used MessageBox and not MessageBoxA or MessageBoxW.

rules on each machine that has the VSTS client on it in order for everyone to be able to use those rules.

The EntryPoint string value allows you to specify the name or ordinal number of the function within the DLL for which you create the prototype. When you don t specify an EntryPoint, then the CLR s P/Invoke process will use the name specified in the unmanaged function prototype. When you specify an EntryPoint value that differs from the unmanaged function prototype name, the EntryPoint takes precedence as the entry point into the DLL. This gives you the ability to rename the unmanaged function. For example, if you wanted the NativeCode.dll s square method to be renamed as Sqr then you would code like this: [DllImportAttribute("NativeCode.dll", EntryPoint="square")] extern "C" long Sqr(long value);

Figure 10 16. Adding a service reference to the project In the completed solution, Listing 10 10 shows the code that performs the same call that the Visual Basic 6 COM client performed. The only difference is that the type name is no longer prefixed with an underscore. This is because when authoring components in .NET, you have control over the interface names, whereas in Visual Basic 6 it s left up to the Visual Basic 6 framework, hidden from normal levels of control. Other than that, there s no discernable difference from the consumer side, as shown in Listing 10 10.

I told you earlier that the CharSet enumeration can modify the name of the unmanaged function. I said can because this functionality only occurs when ExactSpelling is set to false. The value false happens to be the default value of ExactSpelling, so you don t have to add the ExactSpelling named parameter when you want this functionality to occur. On the other hand, if you only want, let s say, the Unicode version of the unmanaged function to be used, then you would need to set ExactSpelling to true and then specify an EntryPoint or prototype name with the W suffix, something like this: [DllImport("user32", CharSet=CharSet::Unicode, ExactSpelling=true)] extern "C" int MessageBoxW(int hWnd, String^ text, String^ caption, unsigned int type);

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