Error Trapping

[JohnJohnUSA]

I ran the following program to retrieve entries from the windows
registry on Windows XP:


import win32api, win32con
aReg = win32api.RegConnectRegistry(None,
win32con.HKEY_CURRENT_USER)
aKey = win32api.RegOpenKeyEx(aReg,
r"Software\Microsoft\Internet Explorer\PageSetup")
for i in range(100):
    Name, Data, Type = win32api.RegEnumValue(aKey, i)
    print "Index=(", i,") Name=[",
Name,"] Data=[",Data,"]
Type=[",Type,"]"
win32api.RegCloseKey(aKey)

This is the program output:

[code:1:8bb6fccb25]Index=( 0 ) Name=[ header ]
Data=[ &w&bPage &p of &P ] Type=[ 1
]
Index=( 1 ) Name=[ footer ] Data=[
&u&b&d ] Type=[ 1 ]
Index=( 2 ) Name=[ margin_bottom ] Data=[ 0.750000
] Type=[ 1 ]
Index=( 3 ) Name=[ margin_left ] Data=[ 0.750000
] Type=[ 1 ]
Index=( 4 ) Name=[ margin_right ] Data=[ 0.750000
] Type=[ 1 ]
Index=( 5 ) Name=[ margin_top ] Data=[ 0.750000
] Type=[ 1 ]

Traceback (most recent call last):
  File "F:/temp/Python Test Folder/Read Windows Registry
Entries (No error trapping).py", line 5, in -toplevel-
    Name, Data, Type = win32api.RegEnumValue(aKey, i)
error: (259, 'PyRegEnumValue', 'No more data is
available.')[/code:1:8bb6fccb25]

I received an error because I tried to read past the last entry for
this key.  The following is a modified version of the program to trap
any error on key entry retrieval:

[code:1:8bb6fccb25]import win32api, win32con, sys
aReg = win32api.RegConnectRegistry(None,
win32con.HKEY_CURRENT_USER)
aKey = win32api.RegOpenKeyEx(aReg,
r"Software\Microsoft\Internet Explorer\PageSetup")
for i in range(100):
    try:
        Name, Data, Type = win32api.RegEnumValue(aKey, i)
        print "Index=(", i,") Name=[",
Name,"] Data=[",Data,"]
Type=[",Type,"]"
    except:
        break
win32api.RegCloseKey(aKey)[/code:1:8bb6fccb25]

This is the program output:

[code:1:8bb6fccb25]Index=( 0 ) Name=[ header ]
Data=[ &w&bPage &p of &P ] Type=[ 1
]
Index=( 1 ) Name=[ footer ] Data=[
&u&b&d ] Type=[ 1 ]
Index=( 2 ) Name=[ margin_bottom ] Data=[ 0.750000
] Type=[ 1 ]
Index=( 3 ) Name=[ margin_left ] Data=[ 0.750000
] Type=[ 1 ]
Index=( 4 ) Name=[ margin_right ] Data=[ 0.750000
] Type=[ 1 ]
Index=( 5 ) Name=[ margin_top ] Data=[ 0.750000
] Type=[ 1 ][/code:1:8bb6fccb25]

The latter program will trap any error resulting from trying to
retrieve the key values.  What I want to do is to specifically trap
the error denoting that there is no more data available so I can
continue executing more code as oppose to aborting the program.  if
the error is something other than no more data available, then I want
to abort the program with an error message.

What code is needed to specifically trap the "no more data is
available" error?

Thank you in advance for your help!