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a union that has a discriminator of enumerated type The DynAny functionality allows us to get around this problem Here again is the relevant part of the show_label function, updated here to use DynAny for decomposition of the label value:
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void show_label(const CORBA::Any * ap) { CORBA::TypeCode_var tc = ap->type(); if (tc->kind() == CORBA::tk_octet) { cout << "default:" << endl; } else { cout << "case "; switch (tc->kind()) { // case CORBA::tk_enum: { DynamicAny::DynAny_var da = daf->create_dyn_any_from_type_code(tc); DynamicAny::DynEnum_var de = DynamicAny::DynEnum::_narrow(da); de->from_any(*ap); CORBA::String_var s = de->get_as_string(); cout << s; } da->destroy();
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break; // } cout << ":" << endl;
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The branch of the switch statement for enumerated types creates a DynEnum by calling create_dyn_any_from_type_code and narrowing the returned reference We know that this must succeed because we have already established that the Any being decoded has an enumerated value The next step is to initialize the DynEnum with the actual value by calling from_any Now the DynEnum is in a well-defined state, and the code calls get_as_string to print the name of the enumerator before it destroys the original DynAny You must destroy the value without the call to destroy, the code would leak the DynAny object Following is another version of the same code Instead of explicitly creating a DynAny object from the type code, it initializes a DynAny from the Any:
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case CORBA::tk_enum: { DynamicAny::DynAny_var da = daf->create_dyn_any(*ap); DynamicAny::DynEnum_var de = DynamicAny::DynEnum::_narrow(da); CORBA::String_var s = de->get_as_string(); cout << s; da->destroy(); } break; //
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We know from the type code that the Any contains an enumerated value This means that there is no need to test for a nil return value from the call to _narrow because that call cannot possibly fail except by throwing an exception (for example, in case of memory exhaustion) We can also use DynEnum to dynamically compose an enumerated value even without knowledge of the IDL To do this, we first construct a type code for the enumerated type and then compose a DynEnum for the value The following code example dynamically creates the type code for the SearchCriterion type in the climate control system and then sets a DynEnum value to contain the LOCATION enumerator:
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// Make a type code for the SearchCriterion type // CORBA::EnumMemberSeq members; memberslength(3); members[0] = CORBA::string_dup("ASSET"); members[1] = CORBA::string_dup("LOCATION"); members[2] = CORBA::string_dup("MODEL"); CORBA::TypeCode_var enum_tc = orb->create_enum_tc( "IDL:acmecom/CCS/Controller/SearchCriterion:10", "SearchCriterion", members ); // Make an Any with the value LOCATION // DynamicAny::DynAny_var da
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= daf->create_dyn_any_from_type_code(enum_tc); DynamicAny::DynEnum_var de = DynamicAny::DynEnum::_narrow(da); de->set_as_string("LOCATION"); CORBA::Any_var an_any = de->to_any(); // Use an_any da->destroy();
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// Set value // Extract Any
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1743 Using DynStruct The DynStruct class allows us to compose structures and exceptions Either you can supply member values as a sequence of name-value pairs and set member values with a single call to set_members or set_members_as_dyn_any, or you can iterate over the members and set each member individually Following is a code fragment that composes a CCS::Thermostat::BtData structure using the set_members_as_dyn_any function The IDL for this structure is as follows:
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#pragma prefix "acmecom" module CCS { // typedef short TempType; // interface Thermostat : Thermometer { struct BtData { TempType requested; TempType min_permitted; TempType max_permitted; string error_msg; }; // }; // };
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The code first constructs the type code for the BtData structure and then creates each element for the member sequence To correctly preserve aliasing information, the code uses DynAny to construct the members of type TempType (Recall from Section 154 that we cannot preserve aliases by inserting a simple type directly into an Any)
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// Create an alias for short called "TempType" // CORBA::TypeCode_var TempType_tc = orb->create_alias_tc( "IDL:acmecom/CCS/TempType:10", "TempType", CORBA::_tc_short ); // Create a sequence containing the definitions for the // four structure members // CORBA::StructMemberSeq mseq; mseqlength(4); mseq[0]name mseq[0]type mseq[1]name mseq[1]type mseq[2]name mseq[2]type mseq[3]name mseq[3]type = = = = = = = = CORBA::string_dup("requested"); TempType_tc; CORBA::string_dup("min_permitted"); TempType_tc; CORBA::string_dup("max_permitted"); TempType_tc; CORBA::string_dup("error_msg"); CORBA::TypeCode::_duplicate(CORBA::_tc_string);
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// Create a type code for the BtData structure // CORBA::TypeCode_var BtData_tc = orb->create_struct_tc( "IDL:acmecom/CCS/Thermostat/BtData:10", "BtData", mseq ); // Create a DynAny objects for the structure members // DynamicAny::DynAny_var requested = daf->create_dyn_any_from_type_code(TempType_tc); requested->insert_short(99); DynamicAny::DynAny_var min_permitted = daf->create_dyn_any_from_type_code(TempType_tc); min_permitted->insert_short(50); DynamicAny::DynAny_var max_permitted = daf->create_dyn_any_from_type_code(TempType_tc); max_permitted->insert_short(90); DynamicAny::DynAny_var error_msg = daf->create_dyn_any_from_type_code(CORBA::_tc_string); error_msg->insert_string("Too hot");