#include?
#include?“open62541.h“

int?main（int?argc?char?*argv[]）
{
????/*?Create?a?client?and?connect?*/
????UA_Client?*client?=?UA_Client_new（UA_ClientConfig_default）;
????UA_StatusCode?status?=?UA_Client_connect（client?“opc.tcp://localhost:4840“）;
????if（status?!=?UA_STATUSCODE_GOOD）?{
????????UA_Client_delete（client）;
????????return?status;
????}

????/*?Read?the?value?attribute?of?the?node.?UA_Client_readValueAttribute?is?a
?????*?wrapper?for?the?raw?read?service?available?as?UA_Client_Service_read.?*/
????UA_Variant?value;?/*?Variants?can?hold?scalar?values?and?arrays?of?any?type?*/
????UA_Variant_init（&value）;
????status?=?UA_Client_readValueAttribute（client?UA_NODEID_STRING（1?“the.answer“）?&value）;
????if（status?==?UA_STATUSCODE_GOOD?&&
???????UA_Variant_hasScalarType（&value?&UA_TYPES[UA_TYPES_INT32]））?{
????????printf（“the?value?is:?%i\n“?*（UA_Int32*）value.data）;
????}

????/*?Clean?up?*/
????UA_Variant_deleteMembers（&value）;
????UA_Client_delete（client）;?/*?Disconnects?the?client?internally?*/
????return?status;
}

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-06-28?15:55??opc\
?????文件?????????534??2018-06-13?03:20??opc\AUTHORS
?????目錄???????????0??2018-06-28?15:55??opc\bin\
?????目錄???????????0??2018-06-28?15:55??opc\bin\examples\
?????文件??????147072??2018-06-13?03:24??opc\bin\examples\client
?????文件??????422208??2018-06-13?03:24??opc\bin\examples\server_ctt
?????文件??????866230??2018-06-13?03:24??opc\bin\libopen62541.a
?????文件??????650569??2018-06-27?10:15??opc\client
?????文件????????1056??2018-06-27?10:14??opc\client.c
?????文件????????1056??2018-06-27?10:14??opc\client.c~
?????目錄???????????0??2018-06-28?15:55??opc\doc_latex\
?????文件??????749471??2018-06-13?03:21??opc\doc_latex\open62541.pdf
?????文件???????16726??2018-06-13?03:20??opc\LICENSE
?????文件?????1675465??2018-06-13?03:23??opc\open62541.c
?????文件??????579924??2018-06-13?03:23??opc\open62541.h
?????文件???????10117??2018-06-13?03:20??opc\README.md
?????文件??????650612??2018-06-27?10:59??opc\server
?????文件????????1904??2018-06-27?13:38??opc\server.c
?????文件????????1904??2018-06-27?10:59??opc\server.c~