c# qr code encoder Using Windows Explorer s Command-Line Syntax in Visual C#.NET

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Using Windows Explorer s Command-Line Syntax
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Cascading folder menus, as described earlier in this chapter, are one way to open Windows Explorer with a particular folder displayed. But they might not be the ideal way. Compare the two views of the System32 folder shown in Figure 16-17. The one on the left was generated by a Start menu item; the one on the right was produced by means of Windows Explorer s command-line syntax. The difference between the two is all in the Folders bar. The command-line string in this case puts the selected folder (System32) at the top of the folder hierarchy, eliminating all folders at higher levels and letting you focus your attention on System32. This is one example of the usefulness of the Windows Explorer command-line syntax. You can probably find others in your own work. You can use Windows Explorer command strings
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Part 4: Storage and File Management
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Microsoft Windows XP Inside Out, Second Edition in shortcuts, with the Start menu s Run command, at the command prompt, or in batch programs or scripts. The syntax is as follows:
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explorer [/n | /e][,/root,object][[,/select],subobject]
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Figure 16-17. The view on the right, produced by a command string, restricts the Folders bar to a particular branch of the file structure.
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The switches, all of which are optional, have the following effects: Switch
/n /e /root,object /select,subobject
Effect
Opens without displaying the Folders bar. Opens with the Folders bar displayed. Restricts Windows Explorer to object and all folders contained within object. Gives the initial focus to the parent folder of subobject and selects subobject. If /Select is omitted, subobject specifies the folder that gets the initial focus.
Let s look at some examples. To begin,
explorer /e,/root,%systemroot%\system32
Part 4: Storage and File Management
Part 1: Part Title
Windows Explorer for Experts opens Windows Explorer and displays the Folders bar, restricting the namespace to %SystemRoot%\System32 and its subfolders. (This is the syntax used to generate the window on the right side of Figure 16-17.) To open %SystemRoot%\Cursors in Windows Explorer, with the Folders bar displayed and the file Appstart.ini selected, you must include the file name and extension in the command string, as follows:
explorer /e, /select,%systemroot%\cursors\appstart.ani
Typing the following opens %SystemRoot% without the Folders bar:
explorer %systemroot%
The folder is loaded as the subobject focus, not as the root folder which means that you can navigate upward from %SystemRoot% in the folder hierarchy. The string
explorer /n
opens the drive on which Windows XP is installed without displaying the Folders bar, whereas
explorer /e,.
opens %UserProfile% and displays the Folders bar.
Using GUIDs to Open Shell Folders in Windows Explorer
A GUID is a string of 32 hexadecimal digits enclosed within braces, with hyphens separating the digits into groups of eight, four, four, four, and twelve like this:
{nnnnnnnn-nnnn-nnnn-nnnn-nnnnnnnnnnnn}
Windows XP uses GUIDs to identify all kinds of objects, including certain system folders. You can open the following GUIDs in Windows Explorer.
{208D2C60-3AEA-1069-A2D7-08002B30309D} {20D04FE0-3AEA-1069-A2D8-08002B30309D} {2227A280-3AEA-1069-A2DE-08002B30309D} {645FF040-5081-101B-9F08-00AA002F954E} {7007ACC7-3202-11D1-AAD2-00805FC1270E} {D6277990-4C6A-11CF-8D87-00AA0060F5BF} My Network Places My Computer Printers And Faxes Network Connections Scheduled Tasks
Part 4: Storage and File Management
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Recycle Bin
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Microsoft Windows XP Inside Out, Second Edition Tip Open Windows Explorer on My Computer If you re one of the many Windows XP users who long for the days when Windows Explorer opened by default on My Computer, instead of My Documents, pine no more. Create a shortcut with either of the following command strings:
explorer.exe /e, ::{20D04FE0-3AEA-1069-A2D8-08002B30309D}
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explorer.exe::{20D04FE0-3AEA-1069-A2D8-08002B30309D}
The first of these opens Windows Explorer with the Folders bar in place.
You might find it convenient to incorporate command strings that use GUIDs in shortcuts for opening Windows Explorer, or in batch programs or scripts. When you construct the command string, put a space after the word explorer and then two colons. Follow the colons immediately with the GUID, like this:
explorer ::{208D2C60-3AEA-1069-A2D7-08002B30309D}
If you use one or more of the optional switches (for example, /root, ), follow the last character in the string with a space, then two colons, then the GUID, like this:
explorer /root, ::{208D2C60-3AEA-1069-A2D7-08002B30309D}
If you don t like typing GUIDs, you can copy them from the registry. In Registry Editor, navigate to HKCR\CLSID. Then use Edit, Find to locate search for the folder you want to open My Network Places, for example. Registry Editor should find a key that has the GUID you want. (Compare it with the preceding table in this book to make sure you have the right one.) Select it and choose Edit, Copy Key Name. You ll be copying the full key path, of course, including My Computer\HKEY_CLASSES_ROOT\CLSID\. But you can edit out the parts you don t need when you paste this text into your command string. If you type the GUID yourself, you can use either capital or lowercase letters. The strings 3AEA and 3aea are equivalent, for example.
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