CODEWITHSUNDEEP
carraysstruct
kiran
kiran

Reputation: 177

Copy structure member to an array

struct {
    char a[10];
    char b[5];
    char c[10];
} info;

How can I concatenate all the struct data members into one single array?

Upvotes: 1

Views: 1624

Answers (2)

rsachetto
rsachetto

Reputation: 175

You could use sprintf. This funcions 'prints' a string into anoter:

int struct_size = sizeof(info);
char *result = (char*)malloc(sizeof(char)*struct_size);
sprintf(result, "%s%s%s", info.a, info.b, info.c);

Upvotes: 0

Oliver Charlesworth
Oliver Charlesworth

Reputation: 272467

With memcpy():

// Assign a buffer big enough to hold everything
char *buf = malloc(sizeof(info.a) + sizeof(info.b) + sizeof(info.c));
// Get a pointer to the beginning of the buffer
char *p = buf;
// Copy sizeof(info.a) bytes of stuff from info.a to p
memcpy(p, info.a, sizeof(info.a));
// Advance p to point immediately after the copy of info.a
p += sizeof(info.a);
// And so on...
memcpy(p, info.b, sizeof(info.b));
p += sizeof(info.b);
memcpy(p, info.c, sizeof(info.c));

Upvotes: 5

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