APPLET_PROC callback function (cpl.h)

Article
02/22/2024

Serves as the entry point for a Control Panel application. This is a library-defined callback function.

Syntax

APPLET_PROC AppletProc;

LONG AppletProc(
  HWND hwndCpl,
  UINT msg,
  LPARAM lParam1,
  LPARAM lParam2
)
{...}

Parameters

hwndCpl

Type: HWND

The identifier of the main window of the controlling application. Use the hwndCPl parameter for dialog boxes or other windows that require a handle to a parent window.

msg

Type: UINT

The message being sent to the Control Panel application.

lParam1

Type: LPARAM

Additional message-specific information.

lParam2

Type: LPARAM

Additional message-specific information.

Return value

Type: LONG

The return value depends on the message.

For more information, see the descriptions of the individual Control Panel messages.

Remarks

Implementers of Control Panel items must also implement this function. No default implementation is available.

Requirements

Requirement	Value
Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	cpl.h

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