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Can we store a structure having a dynamic array in? If yes then how? Plz... help...

For.eg. typedef struct { int* arr; } Data; Data obj; obj.arr = (int*)malloc(2*sizeof(int)); obj.arr[0] = 0; obj.arr[1] = 1; Now i want to store this obj object of structure data...

19th Mar 2020, 5:28 PM
Sp Maurya
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15 ответов
+ 2
Sp, here's a quick fix to make dynamic arrays work. Also, would be cool to see your game when you get it done :) https://pastebin.com/FPH9tnWj
22nd Mar 2020, 5:56 AM
Daniel
Daniel - avatar
+ 4
Sp Maurya , Daniel Good job you guys! 👍
22nd Mar 2020, 11:09 AM
Ipang
+ 2
You want to store this data to file? You need to use something like fwrite: https://overiq.com/c-programming-101/fwrite-function-in-c/
20th Mar 2020, 11:39 AM
Daniel
Daniel - avatar
+ 2
Sp Maurya This is just an idea, Maybe you can add 'count' field into the 'Data' struct. The 'count' field defines how many elements have been allocated for 'arr' field. When saving to file you use 'count' field value as a counter in a loop, so you know how many times for-loop should run, writing each 'arr' element into the file.
21st Mar 2020, 4:36 AM
Ipang
+ 2
You're welcome :) C-way of doing things may take some time to get familiar with, but I believe it pays off in the long run.
22nd Mar 2020, 11:27 AM
Daniel
Daniel - avatar
+ 1
Sp, gotcha. Follow Ipang's advice. That should do the trick.
21st Mar 2020, 8:46 AM
Daniel
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+ 1
Any way thanks for your supports... Ipang , Daniel
21st Mar 2020, 9:23 AM
Sp Maurya
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+ 1
Can you share your program so we can take a look?
21st Mar 2020, 11:46 AM
Daniel
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+ 1
Daniel i'm working on a project so it is quite large but i will share the important part of it
21st Mar 2020, 12:20 PM
Sp Maurya
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+ 1
Here is my code Goto the link.... https://pastebin.com/9C3BNg3T
21st Mar 2020, 10:18 PM
Sp Maurya
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+ 1
Awesome, dude now i get it what was the problem... I was saving the pointer, so we have to save the data one by one and also read it one by one... And here the magic is memcpy which i was not using... Thank you very very much.... 😊 I need to dig more to know the memory concepts more...
22nd Mar 2020, 10:56 AM
Sp Maurya
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+ 1
Also Ipang Thank you, you were also saying the similar solution but i wasn't able to get it how it will be done...
22nd Mar 2020, 10:59 AM
Sp Maurya
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0
Daniel actually i know how to save file... The problem is that in Data there is a pointer to the elements of dynamic array... So when i save the file only that pointer get saved... And again when i read that file i lose the data...
21st Mar 2020, 12:11 AM
Sp Maurya
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0
Daniel i did that already too... 😂😂😂 I think i need to do it in c++, Using vectors...
21st Mar 2020, 9:22 AM
Sp Maurya
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0
Also this code is working when i don't use a dynamic array i.e. by using static array... https://pastebin.com/TuGiB4qg
21st Mar 2020, 10:54 PM
Sp Maurya
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