WIP'

src/ecmcDAQWrap.cpp

@@ -51,6 +51,26 @@ int createDAQArray(const char* name, const char* portName ) {
   return 0;
 }
 
+ecmcDAQDataArray* getDAQArrayFromName(const char *name) { 
+  // Find group by name
+  for(std::vector<ecmcDAQDataArray*>::iterator array = arrays.begin(); array != arrays.end(); ++array) {
+    bool found = strcmp(name, (*array)->getName().c_str()) == 0;   
+    if(found) {
+      return (*array);
+    }
+  }
+  return NULL;
+}
+
+
+int getDAQDataArrayNelm(const char *name){
+  ecmcDAQDataArray array = getDAQArrayFromName(name);
+  if(!array){
+    return -1;
+  }
+  return array->getArraySize();
+}
+
 int createDAQChannel(int type) {
 
   try {
@@ -261,11 +281,68 @@ static void initCallFunc_2(const iocshArgBuf *args) {
   ecmcAddDAQItem(args[0].sval,args[1].ival);
 }
 
+
+/** 
+ * EPICS iocsh shell command: ecmcAddDAQItem
+*/
+void ecmcDAQReadNelmHelp() {
+  printf("\n");
+  printf("       Use ecmcDAQReadNELM(<name>,<result_var_name>)\n");
+  printf("          <name>            : Name of DAQ array object.\n");
+  printf("          <result_var_name> : Variable for return value.\n");
+  printf("\n");
+}
+nelmBuffer[100];
+
+int ecmcDAQReadNelm(const char* name, const char* result_var) {
+  if(!name) {    
+    ecmcAddDAQArrayHelp();
+    return asynError;
+  }
+  if(!result_var) {    
+    ecmcAddDAQArrayHelp();
+    return asynError;
+  }
+  if(strcmp(name,"-h") == 0 || strcmp(name,"--help") == 0 ) {
+    ecmcDAQReadNelmHelp();
+    return asynSuccess;
+  }
+
+  memset(&nelmBuffer[0],0,100);
+  
+  int nelm = 0;
+  try {
+     nelm = getDAQDataArrayNelm(name);
+     sprintf(nelmBuffer, "%zu", nelm);
+     epicsEnvSet(result_var, nelmBuffer);
+  }
+  catch(std::exception& e) {
+    printf("Exception: %s. Find DAQ item failed.\n",e.what());
+    exit(EXIT_FAILURE);
+  }
+
+  return asynSuccess;
+}
+
+static const iocshArg initArg0_3 =
+{ "name", iocshArgString };
+
+static const iocshArg initArg1_3 =
+{ "Return value variable", iocshArgString };
+
+static const iocshArg *const initArgs_3[]  = { &initArg0_3,
+                                               &initArg1_3};
+
+static const iocshFuncDef    initFuncDef_3 = { "ecmcDAQReadNelm", 2, initArgs_3};
+static void initCallFunc_3(const iocshArgBuf *args) {
+  ecmcDAQReadNelm(args[0].sval,args[1].sval);
+}
 // Register
 void ecmcDAQPlgRegister(void) {
   iocshRegister(&initFuncDef_0,  initCallFunc_0);
   iocshRegister(&initFuncDef_1,  initCallFunc_1);
   iocshRegister(&initFuncDef_2,  initCallFunc_2);
+  iocshRegister(&initFuncDef_3,  initCallFunc_3);
 }
 
 epicsExportRegistrar(ecmcDAQPlgRegister);