Passing multi-dimensional array to function in c?

Question

I have an array of string declared like so:

char parts[PART_COUNT][PART_MAX];

Then i made a function which takes a string and a array of strings and splits it into those parts, which is declared like this:

WORD PartString(const char *str, char **parts, char sep);

I can seem to read at parts[i][j], but if i try to assign like this:

parts[i][j] = str[x];

I get this error:

Unhandled exception at 0x012614d8 in remote.exe: 0xC0000005: Access violation writing location 0xcccccccc.

Can anyone tell me a way to do this in C? thanks.

char parts[M][N] is not the same as char **parts; if you've performed a cast in order to get the compiler to stop complaining, then that will be the cause of your problem. — Oliver Charlesworth
– Oliver Charlesworth, Commented Jul 3, 2011 at 18:38
possible duplicate of Converting multidimensional arrays to pointers in c++ — Oliver Charlesworth
– Oliver Charlesworth, Commented Jul 3, 2011 at 18:40
compiler isn't complaining, i passed simply as PartString(buffer, parts, '.'); — Kaije
– Kaije, Commented Jul 3, 2011 at 18:40
That should definitely cause a compiler warning or error message. — Oliver Charlesworth
– Oliver Charlesworth, Commented Jul 3, 2011 at 18:41
You urgently need to deal with the fact that your compiler is broken. — David Heffernan
– David Heffernan, Commented Jul 3, 2011 at 18:44

Oliver Charlesworth · Accepted Answer · 2011-07-03 18:56:43Z

1

#define PART_MAX      1024
#define PART_COUNT    4

Ok, managed to fix it, i had my compiler warnings off and when i turned them back on i got this:

'char **' differs in levels of indirection from 'char [4][1024]'

Heres the new declaration which lets me modify the strings in the array:

WORD PartString(const char *str, char (*parts)[PART_MAX], char sep)

THen i just pass as:

PartString(buffer, parts, '.');

274k34 gold badges591 silver badges687 bronze badges

answered Jul 3, 2011 at 18:55

Kaije

2,6817 gold badges38 silver badges42 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1