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CHAPTER 7 ENCAPSULATING AND PACKAGING YOUR CODE
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F# Interactive starts an event loop automatically, so you require a call to this function in the compiled code only: open System.Windows.Forms let form = new Form(Width=400, Height=300, Visible=true, Text="F# Forms Sample") #if COMPILED // Run the main code System.Windows.Forms.Application.Run(form) #endif
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Note You can specify additional conditional compilation directives by using the --define command-line
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compiler option.
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Choosing Optimization Settings
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The F# compiler comes with a simple choice of optimization levels. You nearly always want to compile your final code using --optimize, which applies maximum optimizations to your code. This is also the default optimization setting for fsc.exe. The F# compiler is a cross-module, cross-assembly optimizing compiler, and it attaches optimization information to each assembly you create when using optimization. This information may contain some code fragments of your assembly, which may be inlined into later assemblies by the optimizing compiler. In some situations, you may not want this information included in your assembly. For example, you may expect to independently version assemblies, and in this case you may want to ensure that code is never duplicated from one assembly to another during compilation. In this case, you can use the --nooptimizationdata switch to prevent optimization data being recorded with the assemblies you create.
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In 2, you saw that comments beginning with /// are XML documentation comments, which are used by interactive tools such as Visual Studio. They can also be collected to generate either HTML or XML documentation. You generate HTML documentation using an auxiliary tool such as FsHtmlDoc, available in the F# Power Pack. You can also generate a simple XML documentation file using the --doc command-line option. You must name the output file. For example, using fsc -a --doc:whales.xml whales.fs for the code in Listing 7-10 generates the file whales.xml containing the following:
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CHAPTER 7 ENCAPSULATING AND PACKAGING YOUR CODE
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< xml version="1.0" encoding="utf-8" > <doc> <assembly><name>whales</name></assembly> <members> <member name="T:Whales.Fictional.WhaleKind"> <summary> The three kinds of whales we cover in this release</summary> </member> <member name="P:Whales.Fictional.bluey"> <summary> The backup whale</summary> </member> <member name="P:Whales.Fictional.moby"> <summary>The main whale</summary> </member> <member name="P:Whales.Fictional.orca"> <summary> This whale is for experimental use only</summary> </member> <member name="P:Whales.Fictional.whales"> <summary> The collected whales</summary> </member> <member name="T:Whales.Fictional"> </member> </members> </doc>
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Building Shared Libraries and Using the Global Assembly Cache
You commonly need to share libraries among multiple applications. You can do this by using any of the following techniques: Including the same library source file in multiple projects and/or compilations Duplicating the DLL for the library into each application directory Creating a strong name-shared library
This section covers the last option in more detail. A strong name-shared library has the following characteristics: It s a DLL. You install it in the .NET global assembly cache (GAC) on the target machine. You give it a strong name by using --keyfile. You package all of its supporting data files using --linkresource. You (optionally) give it a version number using an AssemblyVersion attribute in your code. You ensure that all of its dependencies are shared libraries.
The usual place to install shared libraries is the .NET GAC. The GAC is a collection of assemblies installed on the machine and available for use by any application that has sufficient privileges. Most
CHAPTER 7 ENCAPSULATING AND PACKAGING YOUR CODE
libraries used in this book such as System.Windows.Forms.dll are installed in the GAC when you install the .NET Framework on a machine. The remaining requirements are easy to satisfy and are conditions that must hold before you install something in the GAC. For example, assemblies must have strong names. All assemblies have names; for example, the assembly whales.dll (which you compiled in the earlier Compiling DLLs section using fsc -a whales.fs) has the name whales. An assembly with a strong name includes a hash using a cryptographic public/private key pair. This means only people who have access to the private key can create a strong-named assembly that matches the public key. Users of the DLL can verify that the contents of the DLL were generated by someone holding the private key. A strong name looks something like this: mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 It s easy to create a strong-named assembly: generate a public/private key pair using the sn.exe tool that comes with the .NET Framework SDK, and give that as your keyfile argument. You can install libraries into the GAC using the .NET Framework SDK utility gacutil.exe. The following command-line session shows how to do this for the code shown in Listing 7-10: C:\Users\dsyme\Desktop> sn.exe -k whales.snk Microsoft (R) .NET Framework Strong Name Utility Version 2.0.50727.42 Copyright (c) Microsoft Corporation. All rights reserved. Key pair written to whales.snk C:\Users\dsyme\Desktop> fsc -a --keyfile:whales.snk whales.fs C:\Users\dsyme\Desktop> gacutil /i whales.dll Microsoft (R) .NET Global Assembly Cache Utility. Version 2.0.50727.42 Copyright (c) Microsoft Corporation. All rights reserved. Assembly successfully added to the cache Installer generators such as WiX also include directives to install libraries into the GAC. Installer generators are discussed later in this chapter.
Note If you re planning to write libraries for use by the rest of the world, we recommend that you take the time
to read the .NET library design guidelines, document them using XML and HTML docs, and learn how to version your libraries. 19 takes a deeper look at guidelines for library design.
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