unit umain;

interface

uses
  Windows, Messages, SysUtils, {$IfNDef VER130} Variants, {$EndIf} Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ieview, imageenview, ExtCtrls;

type
  TMainForm = class(TForm)
    Panel1: TPanel;
    ImageEnView1: TImageEnView;
    Button1: TButton;
    Button4: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  MainForm: TMainForm;

implementation

{$R *.dfm}
{$R WindowsTheme.res}

uses
  iexAcquire;

function PurifyFileName(const filename:string):string;
var
  i: integer;
begin
  result := filename;
  for i:=1 to length(result) do
    if (result[i]=':') or (result[i]='_') then
      result[i] := '_';
end;

// Set Twain settings
procedure TMainForm.Button1Click(Sender: TObject);
begin
  // Ask user to select a Twain device
  ImageEnView1.IO.SelectAcquireSource([ieaTwain]);

  // Next call to "Acquire" will only show scanner user interface
  ImageEnView1.IO.TwainParams.ShowSettingsOnly := true;

  // Show scanner user interface, so user can set settings
  if ImageEnView1.IO.Acquire() then
  begin
    // Save settings to file
    // Here we use scanner name. Anyway you could have different settings like "Gray scale", "Color", "ADF"...
    with ImageEnView1.IO.TwainParams do
      SourceSettings.SaveToFile(PurifyFileName(SourceName[SelectedSource])+'.settings');
  end;
end;

// Acquire
procedure TMainForm.Button4Click(Sender: TObject);
var
  FileName:string;
begin
  // Ask user to select a Twain device
  ImageEnView1.IO.SelectAcquireSource([ieaTwain]);

  with ImageEnView1.IO.TwainParams do
  begin
    // Does this settings exists?
    FileName := PurifyFileName(SourceName[SelectedSource])+'.settings';
    if not FileExists(FileName) then
    begin
      ShowMessage('Settings not saved for this device. Please click "Set Twain Settings".');
      exit;
    end;

    // We don't need device dialog (optional)
    VisibleDialog := false;

    // Disable ShowSettingsOnly (this is the default, but could be true from previous session)
    ShowSettingsOnly := false;

    // Load device settings
    SourceSettings.LoadFromFile(FileName);

    FeederEnabled := false;
  end;

  // Capture image using loaded device settings
  ImageEnView1.IO.Acquire();
end;

end.