Exception: Puppet::Util::Windows::Error

Inherits:
Error
  • Object
show all
Extended by:
FFI::Library
Defined in:
lib/puppet/util/windows/error.rb

Overview

represents an error resulting from a Win32 error code

Constant Summary collapse

ERROR_FILE_NOT_FOUND = 
2
ERROR_ACCESS_DENIED = 
5
FORMAT_MESSAGE_ALLOCATE_BUFFER = 
0x00000100
FORMAT_MESSAGE_IGNORE_INSERTS = 
0x00000200
FORMAT_MESSAGE_FROM_SYSTEM = 
0x00001000
FORMAT_MESSAGE_ARGUMENT_ARRAY = 
0x00002000
FORMAT_MESSAGE_MAX_WIDTH_MASK = 
0x000000FF

Instance Attribute Summary collapse

Attributes inherited from Error

#original

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(message, code = FFI.errno, original = nil) ⇒ Error

NOTE: FFI.errno only works properly when prior Win32 calls have been made through FFI bindings. Calls made through Win32API do not have their error codes captured by FFI.errno

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# File 'lib/puppet/util/windows/error.rb', line 16 def initialize(message, code = FFI.errno, original = nil) super(message + ": #{self.class.format_error_code(code)}", original) @code = code end

Instance Attribute Details

#code ⇒ Object (readonly)

Returns the value of attribute code.

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# File 'lib/puppet/util/windows/error.rb', line 11 def code @code end

Class Method Details

.format_error_code(code) ⇒ Object

Helper method that wraps FormatMessage that returns a human readable string.

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# File 'lib/puppet/util/windows/error.rb', line 23 def self.format_error_code(code) # specifying 0 will look for LANGID in the following order  # 1.Language neutral  # 2.Thread LANGID, based on the thread's locale value  # 3.User default LANGID, based on the user's default locale value  # 4.System default LANGID, based on the system default locale value  # 5.US English  dwLanguageId = 0 flags = FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ARGUMENT_ARRAY | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK error_string = ''.dup # this pointer actually points to a :lpwstr (pointer) since we're letting Windows allocate for us  FFI::MemoryPointer.new(:pointer, 1) do |buffer_ptr| length = FormatMessageW(flags, FFI::Pointer::NULL, code, dwLanguageId, buffer_ptr, 0, FFI::Pointer::NULL) if length == FFI::WIN32_FALSE # can't raise same error type here or potentially recurse infinitely  raise Puppet::Error, _("FormatMessageW could not format code %{code}") % { code: code } end # returns an FFI::Pointer with autorelease set to false, which is what we want  buffer_ptr.read_win32_local_pointer do |wide_string_ptr| if wide_string_ptr.null? raise Puppet::Error, _("FormatMessageW failed to allocate buffer for code %{code}") % { code: code } end error_string = wide_string_ptr.read_wide_string(length) end end error_string end