Labview C functions

[OvidiuStanc]

Hello , my teacher told me to post on this forum if i need help with my project. I need to do a C code D L L for Lab view in which i will have many functions implemented and i ran into some problems regarding 2 of those functions.I'm using the Call Library Function Node to call those functions into Lab view.

The first function is like this : i have to input an array (double type) and "n"(int type) as the number of elements into the array. My functions has to output 2 things : 1. the medium value of the elements in the array and 2.the array sorted. I did the first thing with the medium value , but i can't seem to do the sort of the array , probably it's a coding thing , i don't know. I tried a basic bubble sort , still not working. I can also split this into 2 functions , one for the medium value and one for the sort , but the sort one still won't work properly.

The second function should be even easier than the first one . My inputs are again a "double array" , an "int n" and this time a "char c". The function has to output one thing : if the character given is found among the elements of the array. Now i know i can't have a Boolean output from the Call Library Function Node, that's why i was thinking "return 1 if it's true , else return 0" . My code should work , but in Lab view it isn't ...

I attached the 2 codes that i tried .

I'm using Lab view 2018.

[Bob_Schor]

Give us a break!  Suppose one of us wants to run your code -- how do you expect us to do this?

1. View code, hopefully on a single screen.
2. Do a Print Screen.  Oops, I'm working on my laptop, don't have a printer, so I'll wait until I'm at work.
3. Fire up C and type it in, hoping I don't make any mistakes.
4. Say "Why am I bothering to help this user, who won't help me by attaching the code in a file format (e.g. a .c file) that I can just use?"

Note that usually when I go on these rants, it's because someone has attached a picture (and, like you, they used .jpg, a lossy image format, so the image might be blurry or pixelated) instead of the code (a .vi file, in the case of LabVIEW).  But the same principle applies.

Bob Schor

[OvidiuStanc]

Sorry , it's my first time posting something on a forum . I'll post the code from the screenshots here:

Boolean:

#include <stdio.h>

extern "C" __declspec(dllexport)int searchchar(char c,double sir[],int n);

int searchchar(char c,double sir[],int n)
{
   int i;
   for(i=0;i<n;i++)
       if((double)c==sir[i])
            return 1;
return 0;
}

Sort:

#include <stdio.h>

extern "C" __declspec(dllexport) double ValMed(double sir[],int n);

double ValMed(double sir[], int n)
{
   int i;
   double sum=0;
   for (i = 0; i < n; i++)
    sum=sum+sir[i];
   return sum/n;
}
extern "C" __declspec(dllexport) double sortare(double sir[],int n);
double sortare (double sir[],int n)
{
    double aux;
    for(int i =0;i<n;i++){
    if(sir[i] < sir[i+1])
        aux = sir[i];
        sir[i]=sir[i+1];
        sir[i+1]=aux;
}

return sir[10];
}

[wiebe@CARYA]

We'll need some LabVIEW code to see what is wrong with the LabVIEW code...

My guess: change the calling convention...

Not sure why you'd do this in a dll. Is this LabVIEW class or C class homework?