Search the Community

Hello to you all, Sending a cluster with int's I did manage to send an array with clusters from a dll to Labview. Thank you all for the help. You can find the link here: https://lavag.org/topic/22877-can-someone-help-me-with-an-example-for-an-existing-wrapper-dll-which-uses-function-pointer-with-callback-function/#comment-147496 It works fine I am very pleased with it. 😃 Sending a text string I did got a example here: https://forums.ni.com/t5/Example-Code/Posting-Events-to-a-LabVIEW-Event-Structure-From-a-Dll/ta-p/3996283 Tested it and it works fine. Again I am happy 😃 Sending a cluster with int's AND a string Now I want to send a cluster / struct with a couple of int's AND a string of text. I Got a example of how to send text from a C / C++ wrapper to Labview, can someone please help me out? The thing I do not get is, how to combine the both examples. Is "sizeof(structSample)" valid with a LStrHandle in it? How do I copy the data from the string to the struct, etc. Can someone change the code example or help me with the example so it works? I did add some text to the example code to make it more clear I added +++ signs in my comment in the code. Hope someone can help me. Thanx ! // LVUserEvent.cpp : Defines the entry point for the DLL application. // #include "stdafx.h" #include <stdio.h> #include "LVUserEvent.h" #define STRING_LENGHT 256 //Can be any size // ++++ I want to send this Cluster/Struct to Labview typedef struct { int firstInt; int secondInt; int thirdInt // +++++ I try to add this, Gues this will not work .. see extcode.h LStrHandle textString[TEXT_STRING_SIZE]; }structSample; typedef struct{ int32_t size; structSample elm[1]; }totalstructSample, **structHdl LVUSEREVENT_API void SendEvent(LVUserEventRef *rwer) { LStrHandle newStringHandle; //Allocate memory for a LabVIEW string handle using LabVIEW's //memory manager functions. newStringHandle=(LStrHandle)DSNewHandle(sizeof(int32)+STRING_LENGHT*sizeof(uChar)); // +++++ OW no another one ... structHdl = (eventHdl)DSNewHandle(sizeof(totalstructSample)); Sleep(2000); PopulateStringHandle(newStringHandle,"+++ Dear int I don't want you in my PostLVUserEvent"); //Post event to Event structure. Refer to "Using External Code //with LabVIEW manual for information about this function. PostLVUserEvent(*rwer,(void *)&newStringHandle); return; } void PopulateStringHandle(LStrHandle lvStringHandle,char* stringData) { //Empties the buffer memset(LStrBuf(*lvStringHandle),'\0',STRING_LENGHT); //Fills the string buffer with stringData sprintf((char*)LStrBuf(*lvStringHandle),"%s",stringData); //Informs the LabVIEW string handle about the size of the size LStrLen(*lvStringHandle)=strlen(stringData); return; }