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学习open62541 --- [67] 添加自定义Enum并显示名字
2022-07-07 16:49:00 【爱就是恒久忍耐】
Enum类型的变量有点特殊，在base data type里，可以看到enum不能直接实例化，
其属性如下，是抽象类型，
对于自定义enum，需要经过3个步骤来操作，
- 先定义对应的DataType
- 然后再定义对应的变量类型
- 最后使用这个变量类型来创建enum变量
本文讲述如何添加自定义Enum，并创建对应的变量
一 代码
代码如下，
#include "open62541.h"
static bool running = true;
static void stopHandler(int sig) {
UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_USERLAND, "received ctrl-c");
running = false;
}
UA_UInt16 LocalServerNSIndex = 1;
typedef enum {
AA = 0,
BB = 1,
CC = 2,
DD = 3,
__MY_ENUM_FORCE32BIT = 0x7fffffff
} MyEnum;
// 定义DataType
static UA_DataType MyEnumDataType =
{
UA_TYPENAME("MyEnum") /* .typeName */
{
LocalServerNSIndex, UA_NODEIDTYPE_NUMERIC, {
0}}, /* .typeId */
{
LocalServerNSIndex, UA_NODEIDTYPE_NUMERIC, {
0}}, /* .binaryEncodingId */
sizeof(MyEnum), /* .memSize */
UA_DATATYPEKIND_ENUM, /* .typeKind */
true, /* .pointerFree */
1, /* .overlayable */
0, /* .membersSize */
NULL /* .members */
};
// 把enum的datatype添加到namespace里
UA_StatusCode addMyEnumDataType(UA_Server* server)
{
UA_StatusCode ret = UA_STATUSCODE_GOOD;
UA_DataTypeAttributes attr = UA_DataTypeAttributes_default;
attr.displayName = UA_LOCALIZEDTEXT((char*)"en-US", (char*)"My Enum Data Type");
ret = UA_Server_addDataTypeNode(
server, UA_NODEID_NUMERIC(LocalServerNSIndex, 0),
UA_NODEID_NUMERIC(0, UA_NS0ID_ENUMERATION),
UA_NODEID_NUMERIC(0, UA_NS0ID_HASSUBTYPE),
UA_QUALIFIEDNAME(LocalServerNSIndex, (char*)"My.Enum"), attr, NULL, &MyEnumDataType.typeId);
return ret;
}
// 把enum对应的变量类型添加到namespace里
UA_StatusCode addMyEnumVariableType(UA_Server *server, UA_NodeId& myEnumVarTypeId)
{
UA_StatusCode ret = UA_STATUSCODE_GOOD;
UA_VariableTypeAttributes dattr = UA_VariableTypeAttributes_default;
dattr.description = UA_LOCALIZEDTEXT((char*)"en-US", (char*)"My Enum Var type");
dattr.displayName = UA_LOCALIZEDTEXT((char*)"en-US", (char*)"My Enum Var type");
dattr.dataType = MyEnumDataType.typeId;
dattr.valueRank = UA_VALUERANK_SCALAR;
MyEnum p = AA;
UA_Variant_setScalar(&dattr.value, &p, &MyEnumDataType);
ret = UA_Server_addVariableTypeNode(server, UA_NODEID_NUMERIC(LocalServerNSIndex, 0),
UA_NODEID_NUMERIC(0, UA_NS0ID_BASEDATAVARIABLETYPE),
UA_NODEID_NUMERIC(0, UA_NS0ID_HASSUBTYPE),
UA_QUALIFIEDNAME(LocalServerNSIndex, (char*)"My Enum Var type"),
UA_NODEID_NUMERIC(0, UA_NS0ID_BASEDATAVARIABLETYPE),
dattr, NULL, &myEnumVarTypeId);
return ret;
}
// 创建enum变量，并添加到namespace里
UA_StatusCode addMyEnumVariable(UA_Server *server, UA_NodeId myEnumVarTypeId)
{
MyEnum p = CC;
UA_VariableAttributes vattr = UA_VariableAttributes_default;
vattr.description = UA_LOCALIZEDTEXT((char*)"en-US", (char*)"My Enum Var");
vattr.displayName = UA_LOCALIZEDTEXT((char*)"en-US", (char*)"My Enum Var");
vattr.dataType = MyEnumDataType.typeId;
vattr.valueRank = UA_VALUERANK_SCALAR;
UA_Variant_setScalar(&vattr.value, &p, &);
UA_StatusCode ret = UA_STATUSCODE_GOOD;
ret = UA_Server_addVariableNode(server, UA_NODEID_NUMERIC(LocalServerNSIndex, 0),
UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER),
UA_NODEID_NUMERIC(0, UA_NS0ID_ORGANIZES),
UA_QUALIFIEDNAME(LocalServerNSIndex, (char*)"My Enum Var"),
myEnumVarTypeId, vattr, NULL, NULL);
return ret;
}
int main(void)
{
signal(SIGINT, stopHandler);
signal(SIGTERM, stopHandler);
UA_Server *server = UA_Server_new();
UA_ServerConfig *config = UA_Server_getConfig(server);
UA_ServerConfig_setDefault(config);
UA_StatusCode ret = addMyEnumDataType(server);
if (UA_StatusCode_isGood(ret))
{
UA_NodeId myEnumVarTypeId;
ret = addMyEnumVariableType(server, myEnumVarTypeId);
if (UA_StatusCode_isGood(ret))
{
ret = addMyEnumVariable(server, myEnumVarTypeId);
}
}
if (UA_StatusCode_isBad(ret))
{
printf("Error\n");
UA_Server_delete(server);
return 0;
}
UA_Server_run(server, &running);
UA_Server_delete(server);
return 0;
}
编译成功后运行，可以看到变量添加成功，
其值为2，因为CC对应的值就是2
添加的自定义DataType也在namespace里，
二 添加enum名字
从上面的代码可以看到虽然enum变量添加了，似乎和一个int类型的数据没区别，最好能体现出其名字，这里讲下如何给enum类型添加对应的名称，
这里定义一个函数addEnumString，用于给enum的DataType添加名称，如下，
UA_StatusCode addEnumString(UA_Server *server)
{
UA_StatusCode ret = UA_STATUSCODE_GOOD;
UA_VariableAttributes attr = UA_VariableAttributes_default;
attr.minimumSamplingInterval = 0.000000;
attr.userAccessLevel = 1;
attr.accessLevel = 1;
attr.valueRank = 1;
attr.arrayDimensionsSize = 1;
UA_UInt32 arrayDimensions[1];
arrayDimensions[0] = 0;
attr.arrayDimensions = &arrayDimensions[0];
attr.dataType = UA_NODEID_NUMERIC(0, 21LU);
UA_LocalizedText my_enum_variant_DataContents[4];
my_enum_variant_DataContents[0] = UA_LOCALIZEDTEXT((char*)"", (char*)"AA");
my_enum_variant_DataContents[1] = UA_LOCALIZEDTEXT((char*)"", (char*)"BB");
my_enum_variant_DataContents[2] = UA_LOCALIZEDTEXT((char*)"", (char*)"CC");
my_enum_variant_DataContents[3] = UA_LOCALIZEDTEXT((char*)"", (char*)"DD");
UA_Variant_setArray(&attr.value, &my_enum_variant_DataContents, (UA_Int32) 4, &UA_TYPES[UA_TYPES_LOCALIZEDTEXT]);
attr.displayName = UA_LOCALIZEDTEXT((char*)"", (char*)"EnumStrings");
UA_NodeId enumStringNodeId;
ret = UA_Server_addNode_begin(server, UA_NODECLASS_VARIABLE,
UA_NODEID_NUMERIC(LocalServerNSIndex, 0),
MyEnumDataType.typeId,
UA_NODEID_NUMERIC(0, 46LU),
UA_QUALIFIEDNAME(0, (char*)"EnumStrings"),
UA_NODEID_NUMERIC(0, 68LU),
(const UA_NodeAttributes*)&attr,
&UA_TYPES[UA_TYPES_VARIABLEATTRIBUTES], NULL, &enumStringNodeId);
if (UA_StatusCode_isGood(ret))
{
ret = UA_Server_addNode_finish(server, enumStringNodeId);
}
return ret;
}
有4个元素就添加4个名称，注意enum的值必须从0开始，后面都是顺序加1，否则就无法显示名称。在函数addMyEnumDataType里调用addEnumString，如下，
UA_StatusCode addMyEnumDataType(UA_Server* server)
{
UA_StatusCode ret = UA_STATUSCODE_GOOD;
UA_DataTypeAttributes attr = UA_DataTypeAttributes_default;
attr.displayName = UA_LOCALIZEDTEXT((char*)"en-US", (char*)"My Enum Data Type");
ret = UA_Server_addDataTypeNode(
server, UA_NODEID_NUMERIC(LocalServerNSIndex, 0),
UA_NODEID_NUMERIC(0, UA_NS0ID_ENUMERATION),
UA_NODEID_NUMERIC(0, UA_NS0ID_HASSUBTYPE),
UA_QUALIFIEDNAME(LocalServerNSIndex, (char*)"My.Enum"), attr, NULL, &MyEnumDataType.typeId);
if (UA_StatusCode_isGood(ret))
{
ret = addEnumString(server);
}
return ret;
}
重新编译运行，可以看到变量值后面加了其对应的名称，
在DataType里，也可以看到有EnumStrings，
查看EnumStrings的值，如下，是个数组，
这样就实现了我们的期望
完整代码如下，
#include "open62541.h"
static bool running = true;
static void stopHandler(int sig) {
UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_USERLAND, "received ctrl-c");
running = false;
}
const UA_UInt16 LocalServerNSIndex = 1;
typedef enum {
AA = 0,
BB = 1,
CC = 2,
DD = 3,
__MY_ENUM_FORCE32BIT = 0x7fffffff
} MyEnum;
static UA_DataType MyEnumDataType =
{
UA_TYPENAME("MyEnum") /* .typeName */
{
LocalServerNSIndex, UA_NODEIDTYPE_NUMERIC, {
0}}, /* .typeId */
{
LocalServerNSIndex, UA_NODEIDTYPE_NUMERIC, {
0}}, /* .binaryEncodingId */
sizeof(MyEnum), /* .memSize */
UA_DATATYPEKIND_ENUM, /* .typeKind */
true, /* .pointerFree */
1, /* .overlayable */
0, /* .membersSize */
NULL /* .members */
};
UA_StatusCode addEnumString(UA_Server *server)
{
UA_StatusCode ret = UA_STATUSCODE_GOOD;
UA_VariableAttributes attr = UA_VariableAttributes_default;
attr.minimumSamplingInterval = 0.000000;
attr.userAccessLevel = 1;
attr.accessLevel = 1;
attr.valueRank = 1;
attr.arrayDimensionsSize = 1;
UA_UInt32 arrayDimensions[1];
arrayDimensions[0] = 0;
attr.arrayDimensions = &arrayDimensions[0];
attr.dataType = UA_NODEID_NUMERIC(0, 21LU);
UA_LocalizedText my_enum_variant_DataContents[4];
my_enum_variant_DataContents[0] = UA_LOCALIZEDTEXT((char*)"", (char*)"AA");
my_enum_variant_DataContents[1] = UA_LOCALIZEDTEXT((char*)"", (char*)"BB");
my_enum_variant_DataContents[2] = UA_LOCALIZEDTEXT((char*)"", (char*)"CC");
my_enum_variant_DataContents[3] = UA_LOCALIZEDTEXT((char*)"", (char*)"DD");
UA_Variant_setArray(&attr.value, &my_enum_variant_DataContents, (UA_Int32) 4, &UA_TYPES[UA_TYPES_LOCALIZEDTEXT]);
attr.displayName = UA_LOCALIZEDTEXT((char*)"", (char*)"EnumStrings");
UA_NodeId enumStringNodeId;
ret = UA_Server_addNode_begin(server, UA_NODECLASS_VARIABLE,
UA_NODEID_NUMERIC(LocalServerNSIndex, 0),
MyEnumDataType.typeId,
UA_NODEID_NUMERIC(0, 46LU),
UA_QUALIFIEDNAME(0, (char*)"EnumStrings"),
UA_NODEID_NUMERIC(0, 68LU),
(const UA_NodeAttributes*)&attr,
&UA_TYPES[UA_TYPES_VARIABLEATTRIBUTES], NULL, &enumStringNodeId);
if (UA_StatusCode_isGood(ret))
{
ret = UA_Server_addNode_finish(server, enumStringNodeId);
}
return ret;
}
UA_StatusCode addMyEnumDataType(UA_Server* server)
{
UA_StatusCode ret = UA_STATUSCODE_GOOD;
UA_DataTypeAttributes attr = UA_DataTypeAttributes_default;
attr.displayName = UA_LOCALIZEDTEXT((char*)"en-US", (char*)"My Enum Data Type");
ret = UA_Server_addDataTypeNode(
server, UA_NODEID_NUMERIC(LocalServerNSIndex, 0),
UA_NODEID_NUMERIC(0, UA_NS0ID_ENUMERATION),
UA_NODEID_NUMERIC(0, UA_NS0ID_HASSUBTYPE),
UA_QUALIFIEDNAME(LocalServerNSIndex, (char*)"My.Enum"), attr, NULL, &MyEnumDataType.typeId);
if (UA_StatusCode_isGood(ret))
{
ret = addEnumString(server);
}
return ret;
}
UA_StatusCode addMyEnumVariableType(UA_Server *server, UA_NodeId& myEnumVarTypeId)
{
UA_StatusCode ret = UA_STATUSCODE_GOOD;
UA_VariableTypeAttributes dattr = UA_VariableTypeAttributes_default;
dattr.description = UA_LOCALIZEDTEXT((char*)"en-US", (char*)"My Enum Var type");
dattr.displayName = UA_LOCALIZEDTEXT((char*)"en-US", (char*)"My Enum Var type");
dattr.dataType = MyEnumDataType.typeId;
dattr.valueRank = UA_VALUERANK_SCALAR;
MyEnum p = AA;
UA_Variant_setScalar(&dattr.value, &p, &MyEnumDataType);
ret = UA_Server_addVariableTypeNode(server, UA_NODEID_NUMERIC(LocalServerNSIndex, 0),
UA_NODEID_NUMERIC(0, UA_NS0ID_BASEDATAVARIABLETYPE),
UA_NODEID_NUMERIC(0, UA_NS0ID_HASSUBTYPE),
UA_QUALIFIEDNAME(LocalServerNSIndex, (char*)"My Enum Var type"),
UA_NODEID_NUMERIC(0, UA_NS0ID_BASEDATAVARIABLETYPE),
dattr, NULL, &myEnumVarTypeId);
return ret;
}
UA_StatusCode addMyEnumVariable(UA_Server *server, UA_NodeId myEnumVarTypeId)
{
MyEnum p = CC;
UA_VariableAttributes vattr = UA_VariableAttributes_default;
vattr.description = UA_LOCALIZEDTEXT((char*)"en-US", (char*)"My Enum Var");
vattr.displayName = UA_LOCALIZEDTEXT((char*)"en-US", (char*)"My Enum Var");
vattr.dataType = MyEnumDataType.typeId;
vattr.valueRank = UA_VALUERANK_SCALAR;
UA_Variant_setScalar(&vattr.value, &p, &UA_TYPES[UA_TYPES_INT32]);
UA_StatusCode ret = UA_STATUSCODE_GOOD;
ret = UA_Server_addVariableNode(server, UA_NODEID_NUMERIC(LocalServerNSIndex, 0),
UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER),
UA_NODEID_NUMERIC(0, UA_NS0ID_ORGANIZES),
UA_QUALIFIEDNAME(LocalServerNSIndex, (char*)"My Enum Var"),
myEnumVarTypeId, vattr, NULL, NULL);
return ret;
}
int main(void)
{
signal(SIGINT, stopHandler);
signal(SIGTERM, stopHandler);
UA_Server *server = UA_Server_new();
UA_ServerConfig *config = UA_Server_getConfig(server);
UA_ServerConfig_setDefault(config);
UA_StatusCode ret = addMyEnumDataType(server);
if (UA_StatusCode_isGood(ret))
{
UA_NodeId myEnumVarTypeId;
ret = addMyEnumVariableType(server, myEnumVarTypeId);
if (UA_StatusCode_isGood(ret))
{
ret = addMyEnumVariable(server, myEnumVarTypeId);
}
}
if (UA_StatusCode_isBad(ret))
{
printf("Error\n");
UA_Server_delete(server);
return 0;
}
UA_Server_run(server, &running);
UA_Server_delete(server);
return 0;
}
三 小结
本文讲述了如何添加自定义enum，并创建对应的变量，读者可以照葫芦画瓢，添加自己需要的enum。有个点需要注意，最后在创建enum变量时，使用的类型是int32，只需要在变量属性里指定好data type的id就行了。
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