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The SystemParametersInfo function


Submitted on: 7/9/2000 5:43:18 PM
By: Emiel Hollander  
Level: Advanced
User Rating: By 2 Users
Compatibility:Delphi 5, Delphi 4, Pre Delphi 4

Users have accessed this article 4982 times.
     The Windows API function SystemParametersInfo can be used to find out things about the system. The parameters that should be passed to this function depend on the action that should be taken. I will only discuss the actions that get information from the system here. You can also set certain settings using the SystemParametersInfo function. For more info, see the Win32 Programmer's Reference.

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The first parameter determines the action that this function should take. In the actions I discuss here, the second and fourth parameters aren't used. You can enter 0 (zero) for these parameters. The third parameter, however, is a pointer to the variable that the result of this function should be stored in.

If e.g. you want to know if the system beep is set, then you can use the following:

  SystemParametersInfo(SPI_GETBEEP, 0, @BeepSet, 0);

Make sure that BeepSet is defined as a boolean. There are some other actions which also require a boolean as the third parameter.

SPI_GETDRAGFULLWINDOWS - Determines whether dragging of full windows is set or not. This function is only supported on Windows 95 when Windows Plus has been installed.

SPI_GETFONTSMOOTHING - When the font smoothing is enabled, then this action returns truw. Font smoothing is only available on Windows 95 when Windows PLus has been installed.

SPI_GETSCREENSAVEACTIVE - Tells you whether the screensaver is active or not.

There are also actions that require the third parameter to be a pointer to an integer. Like these:

SPI_GETBORDER - This gets the width of a window's sizing border.

SPI_GETSCREENSAVETIMEOUT - Indicates the screensaver time-out value, in seconds.

You could then create the following function to get to know the screensaver time-out:

  function GetScreenSaveTimeOut: integer;
    SystemParametersInfo(SPI_GETSCREENSAVETIMEOUT, 0, @Result, 0);

Same for a boolean, just change "integer" in the function to "boolean".

You can also find out whether Windows Plus has been installed using the SystemParametersInfo function, but it works a little bit different.

  PlusInstalled := SystemParametersInfo(SPI_GETWINDOWSEXTENSION, 1, 0, 0);

Make sure you have defined PlusInstalled as a boolean.

This tip is partially based on Lennie De Villiers tip of February 8th, 2000, about finding out whether the screen saver is active.

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Other User Comments
7/25/2000 10:54:46 PM:Setraline HCI
Hi I was wondering if you had any Delphi32 api references/documentation? Or is there a simple way of translating VB api to Delphi?
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