Creating a login and register screen in Delphi involves designing a user interface (UI) with components for input fields, buttons, and handling user interactions. Below is a simple example using the FireMonkey (FMX) framework in Delphi.
- Drop a
TFormon your project. - Add the necessary components such as
TEditfor input fields,TButtonfor login and register buttons, andTLabelfor displaying messages. - Double-click on the buttons to create
OnClickevent handlers. - Add code to handle user authentication and registration.
Here’s a basic example to get you started:
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unit LoginForm; interface uses System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants, FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs, FMX.StdCtrls, FMX.Edit; type TLoginForm = class(TForm) LabelUsername: TLabel; LabelPassword: TLabel; EditUsername: TEdit; EditPassword: TEdit; ButtonLogin: TButton; ButtonRegister: TButton; LabelMessage: TLabel; procedure ButtonLoginClick(Sender: TObject); procedure ButtonRegisterClick(Sender: TObject); private function AuthenticateUser(const Username, Password: string): Boolean; procedure ShowMessage(const Msg: string); public { Public declarations } end; var LoginForm: TLoginForm; implementation {$R *.fmx} procedure TLoginForm.ButtonLoginClick(Sender: TObject); begin if AuthenticateUser(EditUsername.Text, EditPassword.Text) then ShowMessage(‘Login successful!’) else ShowMessage(‘Invalid username or password.’); end; procedure TLoginForm.ButtonRegisterClick(Sender: TObject); begin // Add code to handle user registration here ShowMessage(‘Registration not implemented yet.’); end; function TLoginForm.AuthenticateUser(const Username, Password: string): Boolean; begin // Add your authentication logic here // For simplicity, let’s assume a hardcoded username and password Result := (Username = ‘user’) and (Password = ‘password’); end; procedure TLoginForm.ShowMessage(const Msg: string); begin LabelMessage.Text := Msg; end; end. |
In this example:
- The
ButtonLoginClickevent handler is triggered when the login button is clicked. It calls theAuthenticateUserfunction to check the credentials and displays a message accordingly. - The
ButtonRegisterClickevent handler is triggered when the register button is clicked. You should add the necessary code to handle user registration. - The
AuthenticateUserfunction performs a simple authentication check. In a real-world scenario, you would typically check against a database or another authentication mechanism.
Customize the code according to your specific authentication and registration logic. Additionally, you might want to add error handling, encryption for password storage, and other security measures based on your application’s requirements.
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