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ruby--ruby/ext/win32ole/win32ole_variant.c
nobu 28b9f11d5a protoize no-arguments functions 
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47744 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2014-09-30 05:25:32 +00:00

707 lines
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#include "win32ole.h"
static void olevariant_free(struct olevariantdata *pvar);
static void ole_val2olevariantdata(VALUE val, VARTYPE vt, struct olevariantdata *pvar);
static void ole_val2variant_err(VALUE val, VARIANT *var);
static void ole_set_byref(VARIANT *realvar, VARIANT *var, VARTYPE vt);
static VALUE folevariant_s_allocate(VALUE klass);
static VALUE folevariant_s_array(VALUE klass, VALUE dims, VALUE vvt);
static void check_type_val2variant(VALUE val);
static VALUE folevariant_initialize(VALUE self, VALUE args);
static LONG *ary2safe_array_index(int ary_size, VALUE *ary, SAFEARRAY *psa);
static void unlock_safe_array(SAFEARRAY *psa);
static SAFEARRAY *get_locked_safe_array(VALUE val);
static VALUE folevariant_ary_aref(int argc, VALUE *argv, VALUE self);
static VALUE folevariant_ary_aset(int argc, VALUE *argv, VALUE self);
static VALUE folevariant_value(VALUE self);
static VALUE folevariant_vartype(VALUE self);
static VALUE folevariant_set_value(VALUE self, VALUE val);
static void
olevariant_free(struct olevariantdata *pvar)
{
VariantClear(&(pvar->realvar));
VariantClear(&(pvar->var));
free(pvar);
}
static void
ole_val2olevariantdata(VALUE val, VARTYPE vt, struct olevariantdata *pvar)
{
HRESULT hr = S_OK;
if (((vt & ~VT_BYREF) == (VT_ARRAY | VT_UI1)) && RB_TYPE_P(val, T_STRING)) {
long len = RSTRING_LEN(val);
void *pdest = NULL;
SAFEARRAY *p = NULL;
SAFEARRAY *psa = SafeArrayCreateVector(VT_UI1, 0, len);
if (!psa) {
rb_raise(rb_eRuntimeError, "fail to SafeArrayCreateVector");
}
hr = SafeArrayAccessData(psa, &pdest);
if (SUCCEEDED(hr)) {
memcpy(pdest, RSTRING_PTR(val), len);
SafeArrayUnaccessData(psa);
V_VT(&(pvar->realvar)) = (vt & ~VT_BYREF);
p = V_ARRAY(&(pvar->realvar));
if (p != NULL) {
SafeArrayDestroy(p);
}
V_ARRAY(&(pvar->realvar)) = psa;
if (vt & VT_BYREF) {
V_VT(&(pvar->var)) = vt;
V_ARRAYREF(&(pvar->var)) = &(V_ARRAY(&(pvar->realvar)));
} else {
hr = VariantCopy(&(pvar->var), &(pvar->realvar));
}
} else {
if (psa)
SafeArrayDestroy(psa);
}
} else if (vt & VT_ARRAY) {
if (val == Qnil) {
V_VT(&(pvar->var)) = vt;
if (vt & VT_BYREF) {
V_ARRAYREF(&(pvar->var)) = &(V_ARRAY(&(pvar->realvar)));
}
} else {
hr = ole_val_ary2variant_ary(val, &(pvar->realvar), (VARTYPE)(vt & ~VT_BYREF));
if (SUCCEEDED(hr)) {
if (vt & VT_BYREF) {
V_VT(&(pvar->var)) = vt;
V_ARRAYREF(&(pvar->var)) = &(V_ARRAY(&(pvar->realvar)));
} else {
hr = VariantCopy(&(pvar->var), &(pvar->realvar));
}
}
}
#if (_MSC_VER >= 1300) || defined(__CYGWIN__) || defined(__MINGW32__)
} else if ( (vt & ~VT_BYREF) == VT_I8 || (vt & ~VT_BYREF) == VT_UI8) {
ole_val2variant_ex(val, &(pvar->realvar), (vt & ~VT_BYREF));
ole_val2variant_ex(val, &(pvar->var), (vt & ~VT_BYREF));
V_VT(&(pvar->var)) = vt;
if (vt & VT_BYREF) {
ole_set_byref(&(pvar->realvar), &(pvar->var), vt);
}
#endif
} else if ( (vt & ~VT_BYREF) == VT_ERROR) {
ole_val2variant_err(val, &(pvar->realvar));
if (vt & VT_BYREF) {
ole_set_byref(&(pvar->realvar), &(pvar->var), vt);
} else {
hr = VariantCopy(&(pvar->var), &(pvar->realvar));
}
} else {
if (val == Qnil) {
V_VT(&(pvar->var)) = vt;
if (vt == (VT_BYREF | VT_VARIANT)) {
ole_set_byref(&(pvar->realvar), &(pvar->var), vt);
} else {
V_VT(&(pvar->realvar)) = vt & ~VT_BYREF;
if (vt & VT_BYREF) {
ole_set_byref(&(pvar->realvar), &(pvar->var), vt);
}
}
} else {
ole_val2variant_ex(val, &(pvar->realvar), (VARTYPE)(vt & ~VT_BYREF));
if (vt == (VT_BYREF | VT_VARIANT)) {
ole_set_byref(&(pvar->realvar), &(pvar->var), vt);
} else if (vt & VT_BYREF) {
if ( (vt & ~VT_BYREF) != V_VT(&(pvar->realvar))) {
hr = VariantChangeTypeEx(&(pvar->realvar), &(pvar->realvar),
cWIN32OLE_lcid, 0, (VARTYPE)(vt & ~VT_BYREF));
}
if (SUCCEEDED(hr)) {
ole_set_byref(&(pvar->realvar), &(pvar->var), vt);
}
} else {
if (vt == V_VT(&(pvar->realvar))) {
hr = VariantCopy(&(pvar->var), &(pvar->realvar));
} else {
hr = VariantChangeTypeEx(&(pvar->var), &(pvar->realvar),
cWIN32OLE_lcid, 0, vt);
}
}
}
}
if (FAILED(hr)) {
ole_raise(hr, eWIN32OLERuntimeError, "failed to change type");
}
}
static void
ole_val2variant_err(VALUE val, VARIANT *var)
{
VALUE v = val;
if (rb_obj_is_kind_of(v, cWIN32OLE_VARIANT)) {
v = folevariant_value(v);
}
if (TYPE(v) != T_FIXNUM && TYPE(v) != T_BIGNUM && v != Qnil) {
rb_raise(eWIN32OLERuntimeError, "failed to convert VT_ERROR VARIANT:`%"PRIsVALUE"'", rb_inspect(v));
}
V_VT(var) = VT_ERROR;
if (v != Qnil) {
V_ERROR(var) = NUM2LONG(val);
} else {
V_ERROR(var) = 0;
}
}
static void
ole_set_byref(VARIANT *realvar, VARIANT *var, VARTYPE vt)
{
V_VT(var) = vt;
if (vt == (VT_VARIANT|VT_BYREF)) {
V_VARIANTREF(var) = realvar;
} else {
if (V_VT(realvar) != (vt & ~VT_BYREF)) {
rb_raise(eWIN32OLERuntimeError, "variant type mismatch");
}
switch(vt & ~VT_BYREF) {
case VT_I1:
V_I1REF(var) = &V_I1(realvar);
break;
case VT_UI1:
V_UI1REF(var) = &V_UI1(realvar);
break;
case VT_I2:
V_I2REF(var) = &V_I2(realvar);
break;
case VT_UI2:
V_UI2REF(var) = &V_UI2(realvar);
break;
case VT_I4:
V_I4REF(var) = &V_I4(realvar);
break;
case VT_UI4:
V_UI4REF(var) = &V_UI4(realvar);
break;
case VT_R4:
V_R4REF(var) = &V_R4(realvar);
break;
case VT_R8:
V_R8REF(var) = &V_R8(realvar);
break;
#if (_MSC_VER >= 1300) || defined(__CYGWIN__) || defined(__MINGW32__)
#ifdef V_I8REF
case VT_I8:
V_I8REF(var) = &V_I8(realvar);
break;
#endif
#ifdef V_UI8REF
case VT_UI8:
V_UI8REF(var) = &V_UI8(realvar);
break;
#endif
#endif
case VT_INT:
V_INTREF(var) = &V_INT(realvar);
break;
case VT_UINT:
V_UINTREF(var) = &V_UINT(realvar);
break;
case VT_CY:
V_CYREF(var) = &V_CY(realvar);
break;
case VT_DATE:
V_DATEREF(var) = &V_DATE(realvar);
break;
case VT_BSTR:
V_BSTRREF(var) = &V_BSTR(realvar);
break;
case VT_DISPATCH:
V_DISPATCHREF(var) = &V_DISPATCH(realvar);
break;
case VT_ERROR:
V_ERRORREF(var) = &V_ERROR(realvar);
break;
case VT_BOOL:
V_BOOLREF(var) = &V_BOOL(realvar);
break;
case VT_UNKNOWN:
V_UNKNOWNREF(var) = &V_UNKNOWN(realvar);
break;
case VT_ARRAY:
V_ARRAYREF(var) = &V_ARRAY(realvar);
break;
default:
rb_raise(eWIN32OLERuntimeError, "unknown type specified(setting BYREF):%d", vt);
break;
}
}
}
static VALUE
folevariant_s_allocate(VALUE klass)
{
struct olevariantdata *pvar;
VALUE obj;
ole_initialize();
obj = Data_Make_Struct(klass,struct olevariantdata,0,olevariant_free,pvar);
VariantInit(&(pvar->var));
VariantInit(&(pvar->realvar));
return obj;
}
/*
* call-seq:
* WIN32OLE_VARIANT.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]]
*
*/
static VALUE
folevariant_s_array(VALUE klass, VALUE elems, VALUE vvt)
{
VALUE obj = Qnil;
VARTYPE vt;
struct olevariantdata *pvar;
SAFEARRAYBOUND *psab = NULL;
SAFEARRAY *psa = NULL;
UINT dim = 0;
UINT i = 0;
ole_initialize();
vt = NUM2UINT(vvt);
vt = (vt | VT_ARRAY);
Check_Type(elems, T_ARRAY);
obj = folevariant_s_allocate(klass);
Data_Get_Struct(obj, struct olevariantdata, pvar);
dim = RARRAY_LEN(elems);
psab = ALLOC_N(SAFEARRAYBOUND, dim);
if(!psab) {
rb_raise(rb_eRuntimeError, "memory allocation error");
}
for (i = 0; i < dim; i++) {
psab[i].cElements = FIX2INT(rb_ary_entry(elems, i));
psab[i].lLbound = 0;
}
psa = SafeArrayCreate((VARTYPE)(vt & VT_TYPEMASK), dim, psab);
if (psa == NULL) {
if (psab) free(psab);
rb_raise(rb_eRuntimeError, "memory allocation error(SafeArrayCreate)");
}
V_VT(&(pvar->var)) = vt;
if (vt & VT_BYREF) {
V_VT(&(pvar->realvar)) = (vt & ~VT_BYREF);
V_ARRAY(&(pvar->realvar)) = psa;
V_ARRAYREF(&(pvar->var)) = &(V_ARRAY(&(pvar->realvar)));
} else {
V_ARRAY(&(pvar->var)) = psa;
}
if (psab) free(psab);
return obj;
}
static void
check_type_val2variant(VALUE val)
{
VALUE elem;
int len = 0;
int i = 0;
if(!rb_obj_is_kind_of(val, cWIN32OLE) &&
!rb_obj_is_kind_of(val, cWIN32OLE_VARIANT) &&
!rb_obj_is_kind_of(val, rb_cTime)) {
switch (TYPE(val)) {
case T_ARRAY:
len = RARRAY_LEN(val);
for(i = 0; i < len; i++) {
elem = rb_ary_entry(val, i);
check_type_val2variant(elem);
}
break;
case T_STRING:
case T_FIXNUM:
case T_BIGNUM:
case T_FLOAT:
case T_TRUE:
case T_FALSE:
case T_NIL:
break;
default:
rb_raise(rb_eTypeError, "can not convert WIN32OLE_VARIANT from type %s",
rb_obj_classname(val));
}
}
}
/*
* Document-class: WIN32OLE_VARIANT
*
* <code>WIN32OLE_VARIANT</code> 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.
*/
/*
* call-seq:
* WIN32OLE_VARIANT.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)
*
*/
static VALUE
folevariant_initialize(VALUE self, VALUE args)
{
int len = 0;
VARIANT var;
VALUE val;
VALUE vvt;
VARTYPE vt;
struct olevariantdata *pvar;
len = RARRAY_LEN(args);
if (len < 1 || len > 3) {
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1..3)", len);
}
VariantInit(&var);
val = rb_ary_entry(args, 0);
check_type_val2variant(val);
Data_Get_Struct(self, struct olevariantdata, pvar);
if (len == 1) {
ole_val2variant(val, &(pvar->var));
} else {
vvt = rb_ary_entry(args, 1);
vt = NUM2INT(vvt);
if ((vt & VT_TYPEMASK) == VT_RECORD) {
rb_raise(rb_eArgError, "not supported VT_RECORD WIN32OLE_VARIANT object");
}
ole_val2olevariantdata(val, vt, pvar);
}
return self;
}
static SAFEARRAY *
get_locked_safe_array(VALUE val)
{
struct olevariantdata *pvar;
SAFEARRAY *psa = NULL;
HRESULT hr;
Data_Get_Struct(val, struct olevariantdata, pvar);
if (!(V_VT(&(pvar->var)) & VT_ARRAY)) {
rb_raise(rb_eTypeError, "variant type is not VT_ARRAY.");
}
psa = V_ISBYREF(&(pvar->var)) ? *V_ARRAYREF(&(pvar->var)) : V_ARRAY(&(pvar->var));
if (psa == NULL) {
return psa;
}
hr = SafeArrayLock(psa);
if (FAILED(hr)) {
ole_raise(hr, rb_eRuntimeError, "failed to SafeArrayLock");
}
return psa;
}
static LONG *
ary2safe_array_index(int ary_size, VALUE *ary, SAFEARRAY *psa)
{
long dim;
LONG *pid;
long i;
dim = SafeArrayGetDim(psa);
if (dim != ary_size) {
rb_raise(rb_eArgError, "unmatch number of indices");
}
pid = ALLOC_N(LONG, dim);
if (pid == NULL) {
rb_raise(rb_eRuntimeError, "failed to allocate memory for indices");
}
for (i = 0; i < dim; i++) {
pid[i] = NUM2INT(ary[i]);
}
return pid;
}
static void
unlock_safe_array(SAFEARRAY *psa)
{
HRESULT hr;
hr = SafeArrayUnlock(psa);
if (FAILED(hr)) {
ole_raise(hr, rb_eRuntimeError, "failed to SafeArrayUnlock");
}
}
/*
* call-seq:
* WIN32OLE_VARIANT[i,j,...] #=> element of OLE array.
*
* 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 indicies should be 0 or natural number and
* lower than or equal to max indicies.
* (This point is different with Ruby Array indicies.)
*
* 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
*
*/
static VALUE
folevariant_ary_aref(int argc, VALUE *argv, VALUE self)
{
struct olevariantdata *pvar;
SAFEARRAY *psa;
VALUE val = Qnil;
VARIANT variant;
LONG *pid;
HRESULT hr;
Data_Get_Struct(self, struct olevariantdata, pvar);
if (!V_ISARRAY(&(pvar->var))) {
rb_raise(eWIN32OLERuntimeError,
"`[]' is not available for this variant type object");
}
psa = get_locked_safe_array(self);
if (psa == NULL) {
return val;
}
pid = ary2safe_array_index(argc, argv, psa);
VariantInit(&variant);
V_VT(&variant) = (V_VT(&(pvar->var)) & ~VT_ARRAY) | VT_BYREF;
hr = SafeArrayPtrOfIndex(psa, pid, &V_BYREF(&variant));
if (FAILED(hr)) {
ole_raise(hr, eWIN32OLERuntimeError, "failed to SafeArrayPtrOfIndex");
}
val = ole_variant2val(&variant);
unlock_safe_array(psa);
if (pid) free(pid);
return val;
}
/*
* call-seq:
* WIN32OLE_VARIANT[i,j,...] = val #=> set the element of OLE array
*
* 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 indicies should be 0 or natural number and
* lower than or equal to max indicies.
* (This point is different with Ruby Array indicies.)
*
* 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
*
*/
static VALUE
folevariant_ary_aset(int argc, VALUE *argv, VALUE self)
{
struct olevariantdata *pvar;
SAFEARRAY *psa;
VARIANT var;
VARTYPE vt;
LONG *pid;
HRESULT hr;
VOID *p = NULL;
Data_Get_Struct(self, struct olevariantdata, pvar);
if (!V_ISARRAY(&(pvar->var))) {
rb_raise(eWIN32OLERuntimeError,
"`[]' is not available for this variant type object");
}
psa = get_locked_safe_array(self);
if (psa == NULL) {
rb_raise(rb_eRuntimeError, "failed to get SafeArray pointer");
}
pid = ary2safe_array_index(argc-1, argv, psa);
VariantInit(&var);
vt = (V_VT(&(pvar->var)) & ~VT_ARRAY);
p = val2variant_ptr(argv[argc-1], &var, vt);
if ((V_VT(&var) == VT_DISPATCH && V_DISPATCH(&var) == NULL) ||
(V_VT(&var) == VT_UNKNOWN && V_UNKNOWN(&var) == NULL)) {
rb_raise(eWIN32OLERuntimeError, "argument does not have IDispatch or IUnknown Interface");
}
hr = SafeArrayPutElement(psa, pid, p);
if (FAILED(hr)) {
ole_raise(hr, eWIN32OLERuntimeError, "failed to SafeArrayPutElement");
}
unlock_safe_array(psa);
if (pid) free(pid);
return argv[argc-1];
}
/*
* call-seq:
* WIN32OLE_VARIANT.value #=> Ruby object.
*
* 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")
*
*/
static VALUE
folevariant_value(VALUE self)
{
struct olevariantdata *pvar;
VALUE val = Qnil;
VARTYPE vt;
int dim;
SAFEARRAY *psa;
Data_Get_Struct(self, struct olevariantdata, pvar);
val = ole_variant2val(&(pvar->var));
vt = V_VT(&(pvar->var));
if ((vt & ~VT_BYREF) == (VT_UI1|VT_ARRAY)) {
if (vt & VT_BYREF) {
psa = *V_ARRAYREF(&(pvar->var));
} else {
psa = V_ARRAY(&(pvar->var));
}
if (!psa) {
return val;
}
dim = SafeArrayGetDim(psa);
if (dim == 1) {
val = rb_funcall(val, rb_intern("pack"), 1, rb_str_new2("C*"));
}
}
return val;
}
/*
* call-seq:
* WIN32OLE_VARIANT.vartype #=> OLE variant type.
*
* Returns OLE variant type.
* obj = WIN32OLE_VARIANT.new("string")
* obj.vartype # => WIN32OLE::VARIANT::VT_BSTR
*
*/
static VALUE
folevariant_vartype(VALUE self)
{
struct olevariantdata *pvar;
Data_Get_Struct(self, struct olevariantdata, pvar);
return INT2FIX(V_VT(&pvar->var));
}
/*
* call-seq:
* WIN32OLE_VARIANT.value = val #=> set WIN32OLE_VARIANT value to val.
*
* 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
*/
static VALUE
folevariant_set_value(VALUE self, VALUE val)
{
struct olevariantdata *pvar;
VARTYPE vt;
Data_Get_Struct(self, struct olevariantdata, pvar);
vt = V_VT(&(pvar->var));
if (V_ISARRAY(&(pvar->var)) && ((vt & ~VT_BYREF) != (VT_UI1|VT_ARRAY) || !RB_TYPE_P(val, T_STRING))) {
rb_raise(eWIN32OLERuntimeError,
"`value=' is not available for this variant type object");
}
ole_val2olevariantdata(val, vt, pvar);
return Qnil;
}
void
Init_win32ole_variant(void)
{
cWIN32OLE_VARIANT = rb_define_class("WIN32OLE_VARIANT", rb_cObject);
rb_define_alloc_func(cWIN32OLE_VARIANT, folevariant_s_allocate);
rb_define_singleton_method(cWIN32OLE_VARIANT, "array", folevariant_s_array, 2);
rb_define_method(cWIN32OLE_VARIANT, "initialize", folevariant_initialize, -2);
rb_define_method(cWIN32OLE_VARIANT, "value", folevariant_value, 0);
rb_define_method(cWIN32OLE_VARIANT, "value=", folevariant_set_value, 1);
rb_define_method(cWIN32OLE_VARIANT, "vartype", folevariant_vartype, 0);
rb_define_method(cWIN32OLE_VARIANT, "[]", folevariant_ary_aref, -1);
rb_define_method(cWIN32OLE_VARIANT, "[]=", folevariant_ary_aset, -1);
/*
* represents VT_EMPTY OLE object.
*/
rb_define_const(cWIN32OLE_VARIANT, "Empty",
rb_funcall(cWIN32OLE_VARIANT, rb_intern("new"), 2, Qnil, INT2FIX(VT_EMPTY)));
/*
* represents VT_NULL OLE object.
*/
rb_define_const(cWIN32OLE_VARIANT, "Null",
rb_funcall(cWIN32OLE_VARIANT, rb_intern("new"), 2, Qnil, INT2FIX(VT_NULL)));
/*
* represents Nothing of VB.NET or VB.
*/
rb_define_const(cWIN32OLE_VARIANT, "Nothing",
rb_funcall(cWIN32OLE_VARIANT, rb_intern("new"), 2, Qnil, INT2FIX(VT_DISPATCH)));
/*
* 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::NoParam, false)
*/
rb_define_const(cWIN32OLE_VARIANT, "NoParam",
rb_funcall(cWIN32OLE_VARIANT, rb_intern("new"), 2, INT2NUM(DISP_E_PARAMNOTFOUND), INT2FIX(VT_ERROR)));
}
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