read me.txt

这个是在mac机上得到U盘盘符的程序

Read Me for VolumeToBSDNode 1.1
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October 4, 2006

Shows how to iterate across all mounted volumes and retrieve the BSD node name (/dev/disk*) for each volume. That information is used to determine if the volume is on a CD, DVD, or some other storage media.


Sample Requirements
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This sample requires Mac OS X and Xcode 2.2.1 or later to build. The sample runs on Mac OS X 10.2 or later.


About the Sample
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The sample uses the Core Services File Manager to iterate across all local volumes. Each volume's BSD node name is fetched, then the I/O Kit APIs are used to find the IOMedia object representing the volume's media. From that I/O Kit can return information about the kind of media on which the volume resides: CD, DVD, or other generic media such as a hard disk.

Occasionally the need arises to find the volumes mounted from a given IOMedia object. The techniques shown in this sample can be used in reverse: get the BSD node name from the IOMedia object, then look for a match among all of the mounted volumes.


Using the Sample
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Simply build and run the sample. Output is sent to the console.

Insert a CD or DVD and note how the output of the sample reflects the kind of media in the optical drive.

	
Changes from Previous Versions
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Updated to produce a universal binary. Modernized and incorporated bug fixes.


Feedback and Bug Reports
------------------------
Please send all feedback about this sample to 
<http://developer.apple.com/contact/feedback.html>.

Please submit any bug reports about this sample to
<http://developer.apple.com/bugreporter>.