c# data matrix barcode Architecture Dependence and 64-bit Programming in C#

Making Data Matrix in C# Architecture Dependence and 64-bit Programming

Architecture Dependence and 64-bit Programming
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The CLR implements a layer that abstracts the processor architecture. Of course, it is true that the IL itself contained in managed assemblies is independent of any specific processor architecture. However, as you ve seen, code compiled with /clr rather than /clr:pure or /clr:safe may contain platform-specific code. Also, even in pure mode, you can invoke platform-specific functions. If you want to produce an application that is capable of running on any implementation of the CLI, you should use the /clr:safe option. If you know you ll be using the Microsoft Windows platform, but want the output code to be neutral with respect to CPU architecture, then you can use /clr:safe. There are x64 and Itanium versions of the CLR, and these versions of the CLR will run the same platform-neutral assemblies compiled with /clr:safe, natively on the x64 architecture. If the x64 CLR is not available (for example, if the 64-bit computer has only a 32-bit operating system installed), the code can be executed by the 32-bit CLR. If you want to produce an application specific to a particular architecture that still runs under the CLR, use the /clr option but use the particular compiler (or cross-compiler) for that architecture. Visual C++ 2005 and Visual C++ 2008 ship cross-compilers for x64 and Intel Itanium architectures, so you can generate code on an x86 computer that will execute natively on a 64-bit computer.
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CHAPTER 3 BUILDING C++/CLI PROGRAMS
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When compiling for 64-bit, there are some potential incompatibilities, since the size of a pointer is different, and so on. Compiler warnings will assist you in resolving these issues.
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Assemblies and Modules
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The fundamental unit or packaging of code compiled for the CLI is the assembly. An assembly could be an executable (EXE), a dynamically linked library (DLL), or possibly a collection of files. The only difference between the first two (other than the file name) is that an executable has an entry point (i.e., a main method). The similarity in file extension to native DLLs and EXEs hides the significant differences in the files themselves. Assemblies and old-style binaries contain executable code, although CLR assemblies contain IL code intended to be executed by the CLR. The picture is a bit more complicated than just that assemblies contain IL code and native DLLs and executables contain native code. Assemblies can actually contain a mixture of native object code and IL. This feature is key for C++ programmers moving existing code to the managed environment, since code that compiles in classic C++ may actually be brought into the CLR fairly easily by recompiling your existing C++ in mixed mode to make an assembly. The actual file will be quite different. Assemblies contain additional information called metadata that a traditional executable or DLL does not contain. The metadata is stored in assemblies along with the generated code. You can view the metadata using a tool called ILDasm.exe that ships with the .NET Framework, as explained in the upcoming section Viewing Metadata with ILDasm.exe. By default, the Visual Studio project build process packages all the source files in a project into a single assembly when the project is built. Similarly, the default behavior of a commandline compilation is to produce a single assembly. However, it is possible to change compiler options or project settings to omit the manifest required in an assembly. If you specify the /LN compiler option and the /NOASSEMBLY linker option, the resulting output is referred to as a .NET module, or just a module. A .NET module has the extension .netmodule to distinguish it from an assembly. Modules are useful when you are planning to combine many modules from different compilations into a single assembly. You could compile the modules separately, and then link them all together with the linker (link.exe) or with something called the assembly linker (al.exe) to produce your final assembly. The CLR won t load modules that haven t been linked into an assembly since they don t have a manifest. The CLR makes use of the metadata in the manifest and cannot load code in a naked module without the metadata from its parent assembly.
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