The following demonstrates how to use Delphi language to download random positive integer numbers within a range from an AlphaRNG device when used with Entropy Server for Windows. The following code will only work when running AlphaRNG Entropy Server. Before using the following example, make sure the AlphaRNG device is plugged into one of USB ports available and entropy-server.exe is running on same system.

A Delphi sample source code for retrieving random positive integer values within a range from an AlphaRNG device when using Entropy Server for Windows.


//
//
// A sample Delphi program that demonstrates how to retrieve positive random numbers
// within a [10...20] range from AlphaRNG device using Entropy Server for Windows.
//
//

program Project1;

{$APPTYPE CONSOLE}

{$R *.res}

uses
  SysUtils,
  Classes;

var
 EntropyServerStream: TFileStream;
 ByteCount: LongWord;
 DwnldRndNumber: LongWord;
 FinalRandNumber: LongWord;
 MinRandomValue: LongWord;
 MaxRandomValue: LongWord;
 RequestByteArray: array[0..7] of Byte;

begin
  EntropyServerStream := TFileStream.Create('\\.\pipe\AlphaRNG', fmOpenReadWrite);
  try

    // Set the random expected range
    MinRandomValue := 10;
    MaxRandomValue := 20;

    // How many random bytes to retrieve
    ByteCount := SizeOf(DwnldRndNumber);

    // Prepare the entropy server request
    // For more information visit https://tectrolabs.com/docs/alpharng/entropy-server-api/
    Move(ByteCount, RequestByteArray[4], SizeOf(ByteCount));

    // Send request to the entropy server.
    // Request bytes should be sent at once with no delay in between.
    EntropyServerStream.WriteBuffer(RequestByteArray, SizeOf(RequestByteArray));

    // Retrieve random bytes from the entropy server.
    // Random bytes should be received at once with no delay in between.
    EntropyServerStream.ReadBuffer(DwnldRndNumber, SizeOf(DwnldRndNumber));

    // Adjust to expected range
    FinalRandNumber := MinRandomValue + (DwnldRndNumber mod (MaxRandomValue - MinRandomValue + 1));

  finally
    EntropyServerStream.Free;
  end;

  // Print the final random number
  Writeln('random integer: ', FinalRandNumber);
  
end.

A Delphi sample source code for retrieving random positive integer values within a range from an AlphaRNG device using Entropy Server and AlphaRNG-32.dll


//
//
// A sample Delphi program that demonstrates how to retrieve positive random numbers
// within a [10...20] range from AlphaRNG device using AlphaRNG-32.dll
//
//
//

program Project1;

{$APPTYPE CONSOLE}
{$R *.res}

uses
  System.SysUtils;

type
  DwnldRndNumberType = LongWord;
  xDwnldRndNumberType = ^DwnldRndNumberType;

var
 DwnldRndNumber: DwnldRndNumberType;
 PDwnldRndNumber:  ^LongWord;
 FinalRandNumber: LongWord;
 MinRandomValue: LongWord;
 MaxRandomValue: LongWord;
 Status: Integer;

 Function getEntropy(p: xDwnldRndNumberType; y: longword): integer; stdcall; external 'C:\tools\alrng-windows-binaries\windows-x86-vs-2019\AlphaRNG-32.dll';

begin
  try

    // Set the random expected range
    MinRandomValue := 10;
    MaxRandomValue := 20;

    Status := getEntropy(@DwnldRndNumber, SizeOf(DwnldRndNumber));
    if Status = 0 then
      begin
        // Adjust to expected range
        FinalRandNumber := MinRandomValue + (DwnldRndNumber mod (MaxRandomValue - MinRandomValue + 1));

        // Print the final random number
        Writeln('random integer: ', FinalRandNumber);
      end
      else
       Writeln('status in error: ', Status);

  except
    on E: Exception do
      writeln(E.ClassName, ': ', E.Message);
  end;


end.