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#include <stdio.h>
int main()
{
srand (clock());
char GUID[40];
int t = 0;
char *szTemp = "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx";
char *szHex = "0123456789ABCDEF-";
int nLen = strlen (szTemp);
for (t=0; t<nLen+1; t++)
{
int r = rand () % 16;
char c = ' ';
switch (szTemp[t])
{
case 'x' : { c = szHex [r]; } break;
case 'y' : { c = szHex [r & 0x03 | 0x08]; } break;
case '-' : { c = '-'; } break;
case '4' : { c = '4'; } break;
}
GUID[t] = ( t < nLen ) ? c : 0x00;
}
printf ("%s\r\n", GUID);
}