class GirFFI::InOutPointer
The InOutPointer class handles conversion between ruby types and pointers for arguments with direction :inout and :out.
TODO: This has now become a more general extended pointer class and should be renamed.
Attributes
value_type[R]
Public Class Methods
for(type)
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# File lib/gir_ffi/in_out_pointer.rb, line 58 def self.for(type) new(type).tap(&:clear) end
from(type, value)
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# File lib/gir_ffi/in_out_pointer.rb, line 62 def self.from(type, value) new(type).tap { |ptr| ptr.set_value value } end
new(type, ptr = nil)
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Calls superclass method
# File lib/gir_ffi/in_out_pointer.rb, line 9 def initialize(type, ptr = nil) @value_type = type ptr ||= AllocationHelper.safe_malloc(value_type_size) super ptr end
Public Instance Methods
clear()
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# File lib/gir_ffi/in_out_pointer.rb, line 54 def clear put_bytes 0, "\x00" * value_type_size, 0, value_type_size end
set_value(value)
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# File lib/gir_ffi/in_out_pointer.rb, line 43 def set_value(value) case value_ffi_type when Module value_ffi_type.copy_value_to_pointer(value, self) when Symbol send "put_#{value_ffi_type}", 0, value else raise NotImplementedError, value_ffi_type end end
to_ruby_value()
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Convert more fully to a ruby value than to_value
# File lib/gir_ffi/in_out_pointer.rb, line 29 def to_ruby_value bare_value = to_value case value_type when :utf8 bare_value.to_utf8 when Array value_type[1].wrap bare_value when Class value_type.wrap bare_value else bare_value end end
to_value()
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TODO: Create type classes that extract values from pointers.
# File lib/gir_ffi/in_out_pointer.rb, line 17 def to_value case value_ffi_type when Module value_ffi_type.get_value_from_pointer(self, 0) when Symbol send("get_#{value_ffi_type}", 0) else raise NotImplementedError end end
Private Instance Methods
value_ffi_type()
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# File lib/gir_ffi/in_out_pointer.rb, line 68 def value_ffi_type @value_ffi_type ||= TypeMap.type_specification_to_ffi_type value_type end
value_type_size()
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# File lib/gir_ffi/in_out_pointer.rb, line 72 def value_type_size @value_type_size ||= FFI.type_size value_ffi_type end