Copying data of Structure into a buffer.

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Hi
I want to copy the data of structure into a buffer.I used memcpy() function but it doesn't work, as structure has padding problem.Variables of my structure is of unsigned char,intn and char type.

Can anybody suggest me how to copy structure data into a buffer.

thanks

Posted 7-Nov-12 23:20pm

Prakash257

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CPallini · Answer 1 · 2012-11-07T23:48:00

Properly used, memcpy must work. e.g.

C++

struct MyStruct
{
  unsigned char u;
  int i;
  char c;
};

#include <cstdio>
#include <cstring>


int main()
{
  unsigned char buf[0x100];

  MyStruct m;
  m.u = 5;
  m.i =  -1;
  m.c = 'A';

  memcpy(buf, &m, sizeof(m));


  printf("buf = { ");
  for (size_t i; i<sizeof(m); i++)  
  {
    printf("%02X ", buf[i]);
  }
  printf("}\n");

}

outputs:

C++

buf = { 05 00 00 00 FF FF FF FF 41 00 00 00 }