How to declare a pointer to the element of structure, i.e. the table structures

LStr, * LStrPtr, * LStrHandle structure is taken from the extcode.h of cintools of LabView
 
I used: sprintf (((*(*in_array)-> Strings [* count])-> str), local_str); for local_str string to
Table of LabView.  It worked well, but a single programmer advised me to change the code to be more readable.
Means - to change (*(*in_array)-> Strings [* count]) of construction to a pointer. I tried several different
ways to implement this - but in all cases it caused LabView crash. I understand that this question
is related to the C not on LabView programming, but you could point me to the place where I error?
The incorrect string is probably "LV_array = & (*. ((**in_array)))" Strings [* Count])); "
 
Thanks in advance.

1 typedef struct {}
2 int32 cnt;            / * number of bytes following * /.
3 uChar str [1];         / * cnt bytes * /.
4} LStr, * LStrPtr, * LStrHandle;
5.
6 typedef struct {}
7 int32 dimSize;
8 LStrHandle string [1];
9} LVStringArray;
10.
11 typedef LVStringArray * LVStrArrayHdl;
12.
13 _declspec (dllexport) void avg_hello (int * count, LVStrArrayHdl in_array)
14.      {
15.
16 unsigned char * local_str = "entry function ma_in();
17. (* County) = 0;
18 LStr * LV_array;
19.
20 LV_array = & (* ((**in_array).)) Strings [* Count])); Address to which to point LV_array
21 subfunc(count, &in_array);                      Call a function that resizes the table (work)
22 sprintf(LV_array->str, local_str);              by passing the string to LabView (does not work)
23.
24.}

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Thanks Andrey Dmitriev! spasibo!

With your example, I realized where I have error in my code:

I tried to assign the address of string pointer that has not yet been preallocated!

that string permutation just means get us final code:

1 typedef struct {}
2 int32 cnt;            / * number of bytes following * /.
3 uChar str [1];         / * cnt bytes * /.
4} LStr, * LStrPtr, * LStrHandle;
5.
6 typedef struct {}
7 int32 dimSize;
8 LStrHandle string [1];
9} LVStringArray;
10.
11 typedef LVStringArray * LVStrArrayHdl;
12.
13 _declspec (dllexport) void avg_hello (int * count, LVStrArrayHdl in_array)
14.      {
15.
16 unsigned char * local_str = "entry function ma_in();
17. (* County) = 0;
18 LStr * LV_array;
19 subfunc(count, &in_array);                      Call a function that resizes the table (works), firstly resize us the table, and only after that can we assign a string address to a pointer

20 LV_array = & (* ((**in_array).)) Strings [* Count]));  Address to which to point LV_array assignment
21.
22 sprintf(LV_array->str, local_str);              by passing the string to LabView (does not work)
23.
24.}

Tags: NI Software

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