Below is an example of what you are looking for.
(I'm giving you the fish, please watch what I do and learn to fish... ;)
You need to look at the standart C library strxxx functions, and you need to learn about C strings, and pointers to be effective with them!
Done wrong, which is easy, they can bite you really hard when you least expect it.
Good luck.
#include "mbed.h"
#ifndef min
#define min(a,b) ( (a) < (b) ? (a) : (b) )
#endif
void mid(const char *src, size_t start, size_t length, char *dst, size_t dstlen)
{ size_t len = min( dstlen - 1, length);
strncpy(dst, src + start, len);
// zero terminate because strncpy() didn't ?
if(len < length)
dst[dstlen-1] = 0;
}
int main()
{
const char *stringSrc = "Hello World";
char stringDst[9];
// copy "World" to destination
mid( stringSrc, 6, strlen(stringSrc) - 6, stringDst, sizeof(stringDst));
// show what we did
printf( "src ...%s...\r\ndst ...%s...\r\n", stringSrc, stringDst);
return 0;
}
Ok, so I never really left BASIC behind me. VB6 is my main tool for whipping something up in a hurry. I'm slowly getting the hang of C/C++ but every now and then I can't figure out how to do very common stuff.
Like Mid(string,start,length)
Is there an available function for this?