UA_Client_addVariableNode请举例使用-Go服务器开发

下面是一个使用 UA_Client_addVariableNode 函数的简单示例：

#include <open62541/client_config_default.h>
#include <open62541/client_highlevel.h>
int main() {
    UA_Client *client = UA_Client_new();
    UA_ClientConfig_setDefault(UA_Client_getConfig(client));
    // 建立与服务器的连接
    UA_StatusCode retval = UA_Client_connect(client, "opc.tcp://localhost:4840");
    if (retval != UA_STATUSCODE_GOOD) {
        printf("连接到服务器失败\n");
        UA_Client_delete(client);
        return -1;
    }
    // 定义变量属性结构体
    UA_VariableAttributes varAttr = UA_VariableAttributes_default;
    varAttr.displayName = UA_LOCALIZEDTEXT("en-US", "MyVariable");
    varAttr.description = UA_LOCALIZEDTEXT("en-US", "This is a sample variable.");
    
    // 添加变量节点
    const char* nodeName = "ns=2;s=MyVariable";  // 变量节点的名称
    const char* parentNodeName = "Objects";      // 父节点的名称
    retval = UA_Client_addVariableNode(
        client,
        UA_NODEID_STRING(2, nodeName),
        UA_NODEID_STRING(0, parentNodeName),
        UA_NODEID_NUMERIC(0, UA_NS0ID_ORGANIZES),
        nodeName,
        NULL,
        &varAttr,
        NULL
     );
     
     if(retval == UA_STATUSCODE_GOOD) {
         printf("成功添加了变量节点\n");
     } else {
         printf("添加变量节点失败： %s\n", UA_StatusCode_name(retval));
     }
     
     // 断开与服务器的连接并释放资源
     UA_Client_disconnect(client);
     UA_Client_delete(client);
     
     return 0;
}