.net core qr code generator The Emulator and the Registry in Visual Basic .NET

Generating QR-Code in Visual Basic .NET The Emulator and the Registry

The Emulator and the Registry
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When compiling an emulator project with Visual Studio, the emulator is registered automatically by the build process in the registry. After that, the emulator can be selected for other .NET Micro Framework applications. During the build process, the information of an emulator is stored in its own and globally unique subkey in Software\Microsoft\.NETMicroFramework\v2.0.3036\Emulators under HKEY_CURRENT_USER (depending on the .NET Micro Framework version); see Figure 12-11.
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Figure 12-11. An emulator automatically registered by the build process
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CHAPTER 12 HARDWARE EMULA TION
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Furthermore, you are able to register an emulator under HKEY_LOCAL_MACHINE (see Figure 12-12). This is a good place for emulators that are installed with a setup program, for example, special emulators for development boards like the emulator of the Freescale i.MXS Development Kit (see 2). Wherever you register the emulator, both subkeys with GUID and friendly names are possible; they must just be unique.
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Figure 12-12. Emulators registered by setup programs Now that you have learned where in the registry the information for an emulator is written, take a look at the information that can be written: Path: The directory and file name of the emulator executable. Name: The friendly name of the emulator, which appears with the emulator selection for a .NET Micro Framework application in the list. Config: A file path for an additional emulator configuration file. The value c:\myconfig.emulatorconfig would be added as "/Config:c:\myconfig.emulatorconfig" to the command line when starting the emulator from Visual Studio. Only one file can be specified here. AdditionalCommandLineOptions: With this value, you can add more command-line arguments, like /verbose. During the build task, the Path and Name values are registered, but the path of a configuration file is not indicated. Therefore, by default, the emulator will look for the file <Emulator name>.emulatorconfig in the emulator directory. All modifications you made manually in a registry subkey for an emulator are overwritten by the build task when the emulator is compiled with Visual Studio. To automatically let the build task write additional command-line arguments or an additional configuration file to the registry, you need to extend the global build file of the .NET Micro Framework SDK, C:\Program Files\MSBuild\Microsoft\.NET Micro Framework\v2.0\ Emulator.targets, with the two bold lines in Listing 12-26.
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CHAPTER 12 HARDWARE EMULA TION
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Listing 12-26. Emulator.targets <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> ... <Target Name="RegisterEmulator" Condition=" '$(EmulatorId)' != '' " > <RegisterEmulator AddtionalCommandLineOptions="$(EmulatorCommandLineOptions)" Config="$(EmulatorConfig)" SubkeyName="$(EmulatorId)" Name="$(EmulatorName)" CurrentUser="$(EmulatorCurrentUser)" Path="$(OutDir)$(TargetFileName)" /> </Target> </Project>
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Caution Modifying the global build file for the .NET Micro Framework SDK is only advised for experienced
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users you should really know what you are doing and have a good reason for doing it. Common scenarios will not require modifying the build file.
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Now, a configuration file or additional command-line options can be added with the project file of an emulator (see Listing 12-27). In this way, each emulator can be configured separately, and the information will be added to the registry when building the emulator with Visual Studio. Listing 12-27. MFEmulator1.csproj <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <PropertyGroup> <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration> <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform> <ProductVersion>8.0.50727</ProductVersion> <SchemaVersion>2.0</SchemaVersion> <ProjectGuid>{8CFAAB2C-BCA4-4217-AA52-2FB2F48C11A9}</ProjectGuid> <OutputType>WinExe</OutputType> <AppDesignerFolder>Properties</AppDesignerFolder> <RootNamespace>MFEmulator1</RootNamespace> <AssemblyName>MFEmulator1</AssemblyName> <EmulatorId>{7273aa6c-3c7e-4a68-ab12-6a0953ab5baf}</EmulatorId> <EmulatorCommandLineOptions>/verbose</EmulatorCommandLineOptions> <Config>"c:\Documents\myconfig.emulatorconfig"</Config> </PropertyGroup> ... </Project>
CHAPTER 12 HARDWARE EMULA TION
Summary
This chapter toured the complete extensible emulator mechanism. You learned how to write, use, and debug custom emulators, as well as a lot about the configuration engine. You now know that the extensible emulator of the .NET Micro Framework is a powerful tool that can assist you to write and debug great embedded applications during the whole development life cycle. A good understanding about how the emulator works and all the rich configuration features will help you with the next chapter, which explores all the built-in emulator components, and you will see how easy it is to extend existing components if they do not provide the desired functionality. 13 also describes many useful custom components to reuse with your custom emulators.
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