How can I disable Ctrl + Alt + Del or Alt + Tab?

Applies To: C++Builder 1 or higher
Category: Knowledge Base

1.

  Start a new project using File | New Application.

 

2.

  Edit the OnShow event:

 

void __fastcall TForm1::FormShow(TObject *Sender)

{

    int result;

    SystemParametersInfo(SPI_SCREENSAVERRUNNING, true, &result,

        0);

}

 

3.

  Edit the OnClose event:

 

void __fastcall TForm1::FormClose(TObject *Sender, TCloseAction

    &Action)

{

    int result;

    SystemParametersInfo(SPI_SCREENSAVERRUNNING, false, &result,

        0);

}

 

As you already know, when a screen saver is running, the special Windows keys are disabled in order to prevent security problems. You can trick Windows into thinking that a screen saver is running.

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