trying to find a fully-random number generator

Question

I work in C and i am trying(desperately) to make a random generator that not only generates a different number every time i run the generator but also a different sequence every time i run the program.I tested almost everything i found online.I resulted in 2 good ways to make a good random generator. The first one is to use a different seed every time.But this means that i have to use a different-random seed every time,a matter that i didn't solve at first.Here is what i am trying now but it's not truly random as i want:

int myrand(int random_seed){
  random_seed = random_seed * 1103515245 +12345;   
  return (unsigned int)(random_seed / 65536) % 32768; 
                           }

Every time i call the function i increase the seed by 1.

The second way is to use time.Time changes and this is randomness.I also tried many ways to implement this.My latest try is here: Compiler error-Possible IDE error"undefined reference to gettimeofday error" but i couldn't use the gettimeofday function because i work in Windows.Also in that question i didn't get any answers.

Could anyone give help me of how i can implement a random generator(probably using time) in C working in Windows?Or should i use Unix?

Answer 1

Seed your RNG with a good source of entropy.

Under unix, use /dev/random.

Under windows, use something like CryptoAPI - Windows equivalent of /dev/random