Programming C# 5.0 by Ian Griffiths

Author:Ian Griffiths [Ian Griffiths]
Language: eng
Format: epub, pdf
Tags: COMPUTERS / Programming Languages / C#
ISBN: 9781449320409
Publisher: O'Reilly Media
Published: 2012-10-11T04:00:00+00:00

Other PE Features

Although C# does not use the classic Win32 mechanisms for representing code or exporting APIs in EXEs and DLLs, there are still a couple of old-school features of the PE format that assemblies can use.

Console versus GUI

Windows makes a distinction between console applications and Windows applications. To be precise, the PE format requires an EXE to specify a subsystem, and back in the old days of Windows NT, this supported multiple operating system personalities—early versions included a POSIX subsystem, for example. These days, you see only three subsystems, and one of those is for kernel-mode device drivers. The two user-mode options used today select between Windows GUI (graphical user interface) and Windows console applications. The principal difference is that Windows will show a console window when running the latter (or if you run it from a command prompt, it will just use the existing console window), but a Windows GUI application does not get a console window.

You can select between subsystems in the project’s Application property page using the “Output type” drop-down list. This offers Windows Application and Console Application. It also offers Class Library, which builds a DLL; DLLs do not specify a subsystem.

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