Show-TryCatchFinally2.ps1

1. <# 
2. .SYNOPSIS 
3.     MSDN Sample of Try/Catch/Finally in PowerShell 
4. .DESCRIPTION 
5.     This script opens a file gets 1st 10 characters. The idea 
6.     is to show more detail on try/catch/finally with PowerShell 
7. .NOTES 
8.     File Name  : show-trycatchfinally2.ps1 
9.     Author     : Thomas Lee - tfl@psp.co.uk 
10.     Requires   : PowerShell V2 CTP3 
11.                  Also needs c:\foo\gd.txt to exist. 
12. .LINK 
13.     Script posted at:
14.     http://pshscripts.blogspot.com/2009/01/show-trycatchfinally2ps1.html
15.     MSDN Sample
16.     http://msdn.microsoft.com/en-us/library/dszsf989.aspx
18. .EXAMPLE 
19.     PSH [C:\foo]: .Show-TryCatchFinally2.PS1' 
20.     First 10 characters: 
21.     N 
22.     a 
23.     m 
24.     e 
25.  
26.  
27.  
28.  
29.  
30.  
31.     -  
32.     - 
33.     - 
34. #> 
35.  
36. ### 
37. # Start of Script 
38. ## 
39.  
40. # Setup and open a file 
41. $path = "c:\foo\gd.txt" 
42. $file = new-object System.IO.StreamReader $path 
43. $buffer = new-object char[] 10 
44.  
45. # now try and read the file 
46. try { 
47.   [void] $file.ReadBlock($buffer, $index, $buffer.Length) 
48.   "First {0} characters:" -f $buffer.length 
49.   $buffer 
50. } 
51. # catch IO exceptions 
52. catch [System.IO.IOException] { 
53. "Error reading from {0}. Message = {1}" -f $path, $Error[0].Message 
54. } 
55. #cleanup 
56. finally { 
57.  if ($file) { 
58.   $file.Close() 
59. } 
60. }