How do I develop Delphi applications that speak and listen?
Last reviewed: 12/15/2011
HOW Article ID: H071135
The information in this article applies to:
- SpeechKit 7
Summary
You can develop Delphi applications that speak and listen using your favorite version of Delphi.
More Information
SpeechKit includes a Delphi Pascal source file (.pas) comprised of the Delphi classes that manage audio, recognizers, and synthesizers.
To access the SpeechKit Delphi classes within your application, first add a project reference to the SpeechKit Delphi source files:
- Within your Delphi project, select Project Options.
- Select the Delphi compiler options.
- Add Search path reference to the SpeechKit unit source file directory: C:\Program Files\Chant\SpeechKit 7\Win32\Delphi\source.
- Add unit output path reference to the local directory with a period '.' character.
- Within your Delphi project, select Project Options.
- Select the Delphi compiler options.
- Add Search path reference to the SpeechKit unit source file directory: C:\Program Files\Chant\SpeechKit 7\Win64\Delphi\source.
- Add unit output path reference to the local directory with a period '.' character.
To access the SpeechKit Delphi classes within your application, add a reference to the ChantShared and SpeechKit units in your uses clause:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ChantShared, SpeechKit;
Add an event handler declaration and Object instance variable to the application declarations:
type
TForm1 = class(TForm)
...
private
{ Private declarations }
public
{ Public declarations }
procedure OnHasAudioEvent(var msg: TMessage);
message WM_APP+1;
procedure OnHasSREvent(var msg: TMessage);
message WM_APP+2;
procedure OnHasTTSEvent(var msg: TMessage);
message WM_APP+3;
end;
var
Form1: TForm1;
ChantAudio1: TChantAudio;
ChantSR1: TChantSR;
ChantTTS1: TChantTTS;
Object Instantiation
Instantiate an instance, set the license and serial properties, and set the event handler message.
procedure TForm1.FormCreate(Sender: TObject);
begin
ChantAudio1 := TChantAudio.Create();
ChantSR1 := TChantSR.Create();
ChantTTS1 := TChantTTS.Create();
// Set license properties
ChantAudio1.SetStringProperty(CSPLicense,'LicenseRegistrationNumber');
ChantAudio1.SetStringProperty(CSPSerials,'LicenseSerialNumber');
ChantSR1.SetStringProperty(CSPLicense,'LicenseRegistrationNumber');
ChantSR1.SetStringProperty(CSPSerials,'LicenseSerialNumber');
ChantTTS1.SetStringProperty(CSPLicense,'LicenseRegistrationNumber');
ChantTTS1.SetStringProperty(CSPSerials,'LicenseSerialNumber');
// Define the HasEvent callback message
ChantAudio1.SetWindowMessage(Handle, WM_APP+1, 0, 0);
ChantSR1.SetWindowMessage(Handle, WM_APP+2, 0, 0);
ChantTTS1.SetWindowMessage(Handle, WM_APP+3, 0, 0);
end;
Event Callbacks
Event callbacks are the mechanism in which the component library sends information back to the application such as a headset was plugged in, speech recognition occurred, audio playback finished, or there was an error.
procedure TForm1.OnHasAudioEvent(var msg: TMessage);
var
aTChantAudioEvent: TChantAudioEvent;
i: Integer;
begin
numberOfEvents := ChantAudio1.GetResourceCount(CSREvent,0,0);
for i := 0 to numberOfEvents - 1 do
begin
// Get the event from the event queue
aTChantAudioEvent := ChantAudio1.GetChantAudioEvent(0);
case tEvent.ChantCallback of
CCDDeviceArrival:
...
end;
...
// Remove the event from the event queue
ChantAudio1.RemoveResource(CSREvent);
aTChantAudioEvent.Destroy();
end;
end;
procedure TForm1.OnHasSREvent(var msg: TMessage);
var
aTChantSREvent: TChantSREvent;
i: Integer;
begin
numberOfEvents := ChantSR1.GetResourceCount(CSREvent,0,0);
for i := 0 to numberOfEvents - 1 do
begin
// Get the event from the event queue
aTChantSREvent := ChantSR1.GetChantSREvent(0);
case tEvent.ChantCallback of
CCSRHasCommand:
...
end;
...
// Remove the event from the event queue
ChantSR1.RemoveResource(CSREvent);
aTChantSREvent.Destroy();
end;
end;
procedure TForm1.OnHasTTSEvent(var msg: TMessage);
var
aTChantTTSEvent: TChantTTSEvent;
i: Integer;
begin
numberOfEvents := ChantTTS1.GetResourceCount(CSREvent,0,0);
for i := 0 to numberOfEvents - 1 do
begin
// Get the event from the event queue
aTChantTTSEvent := ChantTTS1.GetChantTTSEvent(0);
case tEvent.ChantCallback of
CCDAudioStop:
...
end;
...
// Remove the event from the event queue
ChantTTS1.RemoveResource(CSREvent);
aTChantTTSEvent.Destroy();
end;
end;
Deployment Checklist
When you are ready to deploy your Delphi application, you need to ensure you have a valid license, bundle the correct Chant component library, and configure your installation properly on the target system. Review the following checklist before deploying your applications:
- You may deploy your Delphi application to any system with a valid license from the Chant.
- Copy CSpeechKit.dll to the target system and place in the same directory with your application.
- You may deploy your Delphi application to any system with a valid license from the Chant.
- Copy CSpeechKitX64.dll to the target system and place in the same directory with your application.
Sample Projects
Delphi sample projects are installed at the following location:
- My Documents\Chant SpeechKit 7\Win32\Delphi\RS 2007,
- My Documents\Chant SpeechKit 7\Win32\Delphi\RS 2009,
- My Documents\Chant SpeechKit 7\Win32\Delphi\RS 2010,
- My Documents\Chant SpeechKit 7\Win32\Delphi\RS XE,
- My Documents\Chant SpeechKit 7\Win32\Delphi\RS XE2, and
- My Documents\Chant SpeechKit 7\Win32\Delphi\RS XE3.
- My Documents\Chant SpeechKit 7\Win64\Delphi\RS XE2 and
- My Documents\Chant SpeechKit 7\Win64\Delphi\RS XE3.