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FtgRegisterIdleRoutine

Last modified: July 23, 2011

Applies to: Outlook

Adds a FNIDLE function-based idle routine to the MAPI system.

Header file:

Mapiutil.h

Implemented by:

MAPI

Called by:

Client applications and service providers

FTG FtgRegisterIdleRoutine(
  PFNIDLE pfnIdle,
  LPVOID pvIdleParam,
  short priIdle,
  ULONG csecIdle,
  USHORT iroIdle
);

pfnIdle

[in] A pointer to the idle routine.

pvIdleParam

[in] A pointer to a block of memory that the idle engine should pass as a parameter to the idle routine when it calls it.

priIdle

[in] The initial priority for the idle routine. Possible priorities for implementation-defined routines are greater than or less than zero, but not zero. The zero priority is reserved for a user event such as a mouse click or a WM_PAINT message. Priorities greater than zero represent background tasks that have a higher priority than user events and are dispatched as part of the standard Windows message pump loop. Priorities less than zero represent idle tasks that only run during message pump idle time. Examples of priorities are as follows: 1 for foreground submission, 2 for power-edit character insertion, and 3 for downloading new messages.

csecIdle

[in] The initial time value, in hundredths of a second, to be used in specifying idle routine parameters. The meaning of the initial time value varies, depending on what is passed in the iroIdle parameter. The meaning can be one of the following:

  • The minimum period of user inaction that must elapse before the MAPI idle engine calls the idle routine for the first time, if the FIROWAIT flag is set in iroIdle. After this time passes, the idle engine can call the idle routine as often as necessary.

  • The minimum interval between calls to the idle routine, if the FIROINTERVAL flag is set in iroIdle.

iroIdle

[in] The bitmask of flags used to set initial options for the idle routine. The following flags can be set:

FIRONOADJUSTMENT

Use this flag to specify that the idle routine timer should not be adjusted for sleep or resume. The default behavior without this flag is that sleep time is excluded when calculating the elapsed time. If FIRONOADJUSTMENT is passed then the sleep time is included when calculating elapsed time.

FIRODISABLED

The idle routine should be disabled when registered. The default action is to enable the idle routine when FtgRegisterIdleRoutine registers it.

FIROINTERVAL

The time specified by the csecIdle parameter is the minimum interval between successive calls to the idle routine.

FIROONCEONLY

Obsolete. Do not use.

FIROPERBLOCK

Obsolete. Do not use.

FIROWAIT

The time specified by the csecIdle parameter is the minimum period of user inaction that must elapse before the MAPI idle engine calls the idle routine for the first time. After this time passes, the idle engine can call the idle routine as often as necessary.

The FtgRegisterIdleRoutine function returns a function tag identifying the idle routine that was added to the MAPI system. If FtgRegisterIdleRoutine cannot register the idle routine for the client application or service provider, for example because of memory problems, it returns NULL.

The following functions deal with the MAPI idle engine and with idle routines based on the FNIDLE function prototype.

Idle routine function

Usage

   ChangeIdleRoutine   

Changes the characteristics of a registered idle routine.

   DeregisterIdleRoutine   

Removes a registered idle routine from the MAPI system.

   EnableIdleRoutine   

Disables or re-enables a registered idle routine without removing it from the MAPI system.

   FtgRegisterIdleRoutine   

Adds an idle routine to the MAPI system, with or without enabling it.

   MAPIDeInitIdle   

Shuts down the MAPI idle engine for the calling application.

   MAPIInitIdle   

Initializes the MAPI idle engine for the calling application.

   ChangeIdleRoutine, DeregisterIdleRoutine, and EnableIdleRoutine take as an input parameter the function tag returned by FtgRegisterIdleRoutine.

When all foreground tasks for the platform become idle, the MAPI idle engine calls the highest priority idle routine that is ready to execute. There is no guarantee of calling order among idle routines of the same priority.

The following is an example of using the FIRONOADJUSTMENT flag in the iroIdle parameter.

  1. Register an idle routine with a 5 minute delay.

  2. Hibernate/Sleep the computer after 1 minute (4 minutes left on the timer).

  3. Resume the computer 10 minutes later.

The default behavior, without FIRONOADJUSTMENT, is that you still have to wait 4 more minutes for your routine to run. That is, your timer was adjusted to allow for how long the computer was asleep. However, if you pass FIRONOADJUSTMENT your idle routine will run immediately because more than 5 minutes of real time have elapsed.

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