123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687 |
- 3. Adding a server-side method
- ==============================
- This tutorial demonstrates how to add method nodes to the server. Use an UA
- client, e.g., UaExpert to call the method (right-click on the method node ->
- call).
- .. code-block:: c
- #include <signal.h>
- #include <stdlib.h>
- #include "open62541.h"
- UA_Boolean running = true;
- static void stopHandler(int sign) {
- UA_LOG_INFO(logger, UA_LOGCATEGORY_SERVER, "received ctrl-c");
- running = 0;
- }
- UA_Logger logger = UA_Log_Stdout;
- static UA_StatusCode
- helloWorldMethod(void *handle, const UA_NodeId objectId, size_t inputSize,
- const UA_Variant *input, size_t outputSize, UA_Variant *output) {
- UA_String *inputStr = (UA_String*)input->data;
- UA_String tmp = UA_STRING_ALLOC("Hello ");
- if(inputStr->length > 0) {
- tmp.data = realloc(tmp.data, tmp.length + inputStr->length);
- memcpy(&tmp.data[tmp.length], inputStr->data, inputStr->length);
- tmp.length += inputStr->length;
- }
- UA_Variant_setScalarCopy(output, &tmp, &UA_TYPES[UA_TYPES_STRING]);
- UA_String_deleteMembers(&tmp);
- UA_LOG_INFO(logger, UA_LOGCATEGORY_SERVER, "Hello World was called");
- return UA_STATUSCODE_GOOD;
- }
- int main(int argc, char** argv) {
- signal(SIGINT, stopHandler); /* catches ctrl-c */
- /* initialize the server */
- UA_ServerConfig config = UA_ServerConfig_standard;
- UA_ServerNetworkLayer nl = UA_ServerNetworkLayerTCP(UA_ConnectionConfig_standard, 16664);
- config.networkLayers = &nl;
- config.networkLayersSize = 1;
- UA_Server *server = UA_Server_new(config);
- /* add the method node with the callback */
- UA_Argument inputArguments;
- UA_Argument_init(&inputArguments);
- inputArguments.arrayDimensionsSize = 0;
- inputArguments.arrayDimensions = NULL;
- inputArguments.dataType = UA_TYPES[UA_TYPES_STRING].typeId;
- inputArguments.description = UA_LOCALIZEDTEXT("en_US", "A String");
- inputArguments.name = UA_STRING("MyInput");
- inputArguments.valueRank = -1;
- UA_Argument outputArguments;
- UA_Argument_init(&outputArguments);
- outputArguments.arrayDimensionsSize = 0;
- outputArguments.arrayDimensions = NULL;
- outputArguments.dataType = UA_TYPES[UA_TYPES_STRING].typeId;
- outputArguments.description = UA_LOCALIZEDTEXT("en_US", "A String");
- outputArguments.name = UA_STRING("MyOutput");
- outputArguments.valueRank = -1;
- UA_MethodAttributes helloAttr;
- UA_MethodAttributes_init(&helloAttr);
- helloAttr.description = UA_LOCALIZEDTEXT("en_US","Say `Hello World`");
- helloAttr.displayName = UA_LOCALIZEDTEXT("en_US","Hello World");
- helloAttr.executable = true;
- helloAttr.userExecutable = true;
- UA_Server_addMethodNode(server, UA_NODEID_NUMERIC(1,62541),
- UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER),
- UA_NODEID_NUMERIC(0, UA_NS0ID_HASORDEREDCOMPONENT),
- UA_QUALIFIEDNAME(1, "hello world"),
- helloAttr, &helloWorldMethod, NULL,
- 1, &inputArguments, 1, &outputArguments, NULL);
- /* run the server */
- UA_Server_run(server, &running);
- UA_Server_delete(server);
- nl.deleteMembers(&nl);
- return 0;
- }
|