Class: WIN32OLE_VARIANT

Relationships & Source Files
Inherits:	Object
Defined in:	ext/win32ole/win32ole_variant.c, ext/win32ole/win32ole_variant.c

Overview

WIN32OLE_VARIANT objects represents OLE variant.

Win32OLE converts Ruby object into OLE variant automatically when invoking OLE methods. If OLE method requires the argument which is different from the variant by automatic conversion of Win32OLE, you can convert the specfied variant type by using WIN32OLE_VARIANT class.

param = WIN32OLE_VARIANT.new(10, WIN32OLE::VARIANT::VT_R4)
oleobj.method(param)

WIN32OLE_VARIANT does not support VT_RECORD variant. Use WIN32OLE_RECORD class instead of WIN32OLE_VARIANT if the VT_RECORD variant is needed.

Constant Summary

Empty =

represents VT_EMPTY OLE object.

# File 'ext/win32ole/win32ole_variant.c', line 708
```
rb_funcall(cWIN32OLE_VARIANT, rb_intern("new"), 2, Qnil, INT2FIX(VT_EMPTY))
```

NoParam =

:NoParam, false)

# File 'ext/win32ole/win32ole_variant.c', line 730

represents VT_ERROR variant with DISP_E_PARAMNOTFOUND.
This constants is used for not specified parameter.

fso = WIN32OLE.new("Scripting.FileSystemObject")
fso.openTextFile(filename, WIN32OLE_VARIANT

Nothing =

represents Nothing of VB.NET or VB.

# File 'ext/win32ole/win32ole_variant.c', line 720
```
rb_funcall(cWIN32OLE_VARIANT, rb_intern("new"), 2, Qnil, INT2FIX(VT_DISPATCH))
```
Null =

represents VT_NULL OLE object.

# File 'ext/win32ole/win32ole_variant.c', line 714
```
rb_funcall(cWIN32OLE_VARIANT, rb_intern("new"), 2, Qnil, INT2FIX(VT_NULL))
```

Class Method Summary

.array(ary, vt)

Returns Ruby object wrapping OLE variant whose variant type is VT_ARRAY.
.new(val, vartype) # = > WIN32OLE_VARIANT object.)) constructor

Returns Ruby object wrapping OLE variant.

Instance Attribute Summary

#value(#=> Ruby object.) rw

Returns Ruby object value from OLE variant.
#value=(val #=> set WIN32OLE_VARIANT value to val.) rw

Sets variant value to val.

Instance Method Summary

#[](*args)

Returns the element of WIN32OLE_VARIANT object(OLE array).
#[]=(*args)

Set the element of WIN32OLE_VARIANT object(OLE array) to val.
#vartype(#=> OLE variant type.)

Returns OLE variant type.

Constructor Details

.new(val, vartype) # = > WIN32OLE_VARIANT object.))

Returns Ruby object wrapping OLE variant. The first argument specifies Ruby object to convert OLE variant variable. The second argument specifies VARIANT type. In some situation, you need the WIN32OLE_VARIANT object to pass OLE method

shell = WIN32OLE.new("Shell.Application")
folder = shell.NameSpace("C:\\Windows")
item = folder.ParseName("tmp.txt")
# You can't use Ruby String object to call FolderItem.InvokeVerb.
# Instead, you have to use WIN32OLE_VARIANT object to call the method.
shortcut = WIN32OLE_VARIANT.new("Create Shortcut(\&S)")
item.invokeVerb(shortcut)

Class Method Details

.array(ary, vt)

Returns Ruby object wrapping OLE variant whose variant type is VT_ARRAY. The first argument should be Array object which specifies dimensions and each size of dimensions of OLE array. The second argument specifies variant type of the element of OLE array.

The following create 2 dimensions OLE array. The first dimensions size is 3, and the second is 4.

ole_ary = WIN32OLE_VARIANT.array([3,4], VT_I4)
ruby_ary = ole_ary.value # => [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]

Instance Attribute Details

#value(#=> Ruby object.) (rw)

Returns Ruby object value from OLE variant.

obj = WIN32OLE_VARIANT.new(1, WIN32OLE::VARIANT::VT_BSTR)
obj.value # => "1" (not Fixnum object, but String object "1")

#value=(val #=> set WIN32OLE_VARIANT value to val.) (rw)

Sets variant value to val. If the val type does not match variant value type(vartype), then val is changed to match variant value type(vartype) before setting val. Thie method is not available when vartype is VT_ARRAY(except VT_UI1|VT_ARRAY). If the vartype is VT_UI1|VT_ARRAY, the val should be String object.

obj = WIN32OLE_VARIANT.new(1) # obj.vartype is WIN32OLE::VARIANT::VT_I4
obj.value = 3.2 # 3.2 is changed to 3 when setting value.
p obj.value # => 3

Instance Method Details

#[](*args)

Returns the element of WIN32OLE_VARIANT object(OLE array). This method is available only when the variant type of WIN32OLE_VARIANT object is VT_ARRAY.

REMARK:

The all indices should be 0 or natural number and
lower than or equal to max indices.
(This point is different with Ruby Array indices.)

obj = WIN32OLE_VARIANT.new([[1,2,3],[4,5,6]])
p obj[0,0] # => 1
p obj[1,0] # => 4
p obj[2,0] # => WIN32OLERuntimeError
p obj[0, -1] # => WIN32OLERuntimeError

#[]=(*args)

Set the element of WIN32OLE_VARIANT object(OLE array) to val. This method is available only when the variant type of WIN32OLE_VARIANT object is VT_ARRAY.

REMARK:

The all indices should be 0 or natural number and
lower than or equal to max indices.
(This point is different with Ruby Array indices.)

obj = WIN32OLE_VARIANT.new([[1,2,3],[4,5,6]])
obj[0,0] = 7
obj[1,0] = 8
p obj.value # => [[7,2,3], [8,5,6]]
obj[2,0] = 9 # => WIN32OLERuntimeError
obj[0, -1] = 9 # => WIN32OLERuntimeError

#vartype(#=> OLE variant type.)

Returns OLE variant type.

obj = WIN32OLE_VARIANT.new("string")
obj.vartype # => WIN32OLE::VARIANT::VT_BSTR