2. Beep API Call

• Command

      dumpbin /exports C:\Windows\System32\kernel32.dll
  

  prints a list of windows API functions available to a console application.

• One of the APIs is a Beep function, which generates simple tone on the system speaker (not using the sound card.)

• The following C++ program demonstrates a loop of 50-millisecond Beeps with rising the tone frequency:

  
  #include <iostream>
  #include <windows.h>
  
  int main()
  {
      int ms = 50; // sound duration in milliseconds
      
      for ( int frequency = 100; frequency < 1000; frequency += 10 ) {
          std::cout << frequency << " "; // display sound frequency in hertz before each tone.
          Beep( frequency, ms );
      }
      return 0;
  }