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SystemParametersInfo

The SystemParametersInfo function queries or sets systemwide parameters. This function can also update the user profile while setting a parameter.

VB4-32,5,6
Declare Function SystemParametersInfo Lib "user32" Alias "SystemParametersInfoA" (ByVal uAction As Long, ByVal uParam As Long, ByVal lpvParam As Any, ByVal fuWinIni As Long) As Long

Operating Systems Supported
Requires Windows NT 3.1 or later; Requires Windows 95 or later

Library
User32

Parameter Information
· uiAction
Specifies the systemwide parameter to query or set. This parameter can be one of the following values:
SPI_GETACCESSTIMEOUT
Retrieves information about the time-out period associated with the accessibility features. The pvParam parameter must point to an ACCESSTIMEOUT structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(ACCESSTIMEOUT).
SPI_GETANIMATION
Retrieves the animation effects associated with user actions. The pvParam parameter must point to an ANIMATIONINFO structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(ANIMATIONINFO).
SPI_GETBEEP
Indicates whether the warning beeper is on.
The pvParam parameter is a pointer to a BOOL that receives TRUE if the beeper is on, or FALSE if it is off.
SPI_GETBORDER
Retrieves the border multiplier factor that determines the width of a window’s sizing border. The pvParam parameter must point to an integer variable.
SPI_GETDEFAULTINPUTLANG
Returns the keyboard layout handle for the system default input language. The pvParam parameter must point to the 32-bit variable that receives the keyboard layout handle for the default language. The uiParam parameter is not used.
SPI_GETDRAGFULLWINDOWS
Determines whether dragging of full windows is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled, or FALSE otherwise.
Windows 95: This flag is supported only if Windows Plus! is installed. See SPI_GETWINDOWSEXTENSION.
SPI_GETFASTTASKSWITCH
This flag is obsolete. Previous versions of Windows use this flag to determine whether ALT+TAB fast task switching is enabled. Beginning with Windows 95 and Windows NT version 4.0, fast task switching is always enabled.
SPI_GETFILTERKEYS
Retrieves information about the FilterKeys accessibility feature. The pvParam parameter must point to a FILTERKEYS structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(FILTERKEYS).
SPI_GETFONTSMOOTHING
Indicates whether the font smoothing feature is enabled. This feature uses font anti-aliasing to make font curves appear smoother by painting pixels at different gray levels.
The pvParam parameter is a pointer to a BOOL variable that receives TRUE if the feature is enabled, or FALSE if it is not.
Windows 95: This flag is supported only if Windows Plus! is installed. See SPI_GETWINDOWSEXTENSION.
SPI_GETGRIDGRANULARITY
Retrieves the current granularity value of the desktop sizing grid. The pvParam parameter must point to an integer variable that receives the granularity.
SPI_GETHIGHCONTRAST
Windows 95 only: Retrieves information about the HighContrast accessibility feature. The pvParam parameter must point to a HIGHCONTRAST structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(HIGHCONTRAST).
SPI_GETICONMETRICS
Retrieves the metrics associated with icons. The pvParam parameter must point to an ICONMETRICS structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(ICONMETRICS).
SPI_GETICONTITLELOGFONT
Retrieves the logical font information for the current icon-title font. The uiParam parameter specifies the size of a LOGFONT structure, and the pvParam parameter must point to the LOGFONT structure to fill in.
SPI_GETICONTITLEWRAP
Determines whether icon-title wrapping is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled, or FALSE otherwise.
SPI_GETKEYBOARDDELAY
Retrieves the keyboard repeat-delay setting. The pvParam parameter must point to an integer variable that receives the setting.
SPI_GETKEYBOARDPREF
Determines whether the user relies on the keyboard instead of the mouse, and wants applications to display keyboard interfaces that would otherwise be hidden. The pvParam parameter must point to a BOOL variable that receives TRUE if the user relies on the keyboard; the variable receives FALSE otherwise.
SPI_GETKEYBOARDSPEED
Retrieves the keyboard repeat-speed setting. The pvParam parameter must point to a DWORD variable that receives the setting.
SPI_GETLOWPOWERACTIVE
This flag is not supported for 32-bit applications on Windows NT or Windows 95.
Windows 95 only: For 16-bit Windows applications, this value determines whether the low-power phase of screen saving is enabled or not. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled, or FALSE if disabled.
SPI_GETLOWPOWERTIMEOUT
This flag is not supported for 32-bit applications on Windows NT or Windows 95.
Windows 95 only: For 16-bit Windows applications, this value retrieves the time-out value for the low-power phase of screen saving. The pvParam parameter must point to an integer value that receives the value.
SPI_GETMENUDROPALIGNMENT
Determines whether pop-up menus are left-aligned or right-aligned, relative to the corresponding menu-bar item. The pvParam parameter must point to a BOOL variable that receives TRUE if left-aligned, or FALSE otherwise.
SPI_GETMINIMIZEDMETRICS
Retrieves the metrics associated with minimized windows. The pvParam parameter must point to a MINIMIZEDMETRICS structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(MINIMIZEDMETRICS).
SPI_GETMOUSE
Retrieves the two mouse threshold values and the mouse speed. The pvParam parameter must point to an array of three integers that receives these values. See mouse_event for further information.
SPI_GETMOUSEHOVERHEIGHT
Windows NT only: Gets the height, in pixels, of the rectangle within which the mouse pointer has to stay for TrackMouseEvent to generate a WM_MOUSEHOVER message. The height is returned in a UINT pointed to by the pvParam parameter.
SPI_GETMOUSEHOVERTIME
Windows NT only: Gets the time, in milliseconds, that the mouse pointer has to stay in the hover rectangle for TrackMouseEvent to generate a WM_MOUSEHOVER message. The time is returned in a UINT pointed to by the pvParam parameter.
SPI_GETMOUSEHOVERWIDTH
Windows NT only: Gets the width, in pixels, of the rectangle within which the mouse pointer has to stay for TrackMouseEvent to generate a WM_MOUSEHOVER message. The width is returned in a UINT pointed to by the pvParam parameter.
SPI_GETMOUSEKEYS
Retrieves information about the MouseKeys accessibility feature. The pvParam parameter must point to a MOUSEKEYS structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(MOUSEKEYS).
SPI_GETMOUSETRAILS
Windows 95 only: Indicates whether the Mouse Trails feature is enabled. This feature improves the visibility of mouse cursor movements by briefly showing a trail of cursors and quickly erasing them.
The pvParam parameter is a pointer to an INT variable that receives a value. If the value is zero or 1, the feature is disabled. If the value is greater than 1, the feature is enabled and the value indicates the number of cursors drawn in the trail. The uiParam parameter is not used.
SPI_GETNONCLIENTMETRICS
Retrieves the metrics associated with the nonclient area of nonminimized windows. The pvParam parameter must point to a NONCLIENTMETRICS structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(NONCLIENTMETRICS).
SPI_GETPOWEROFFACTIVE
This flag is not supported for 32-bit applications on Windows NT or Windows 95.
Windows 95 only: For 16-bit Windows applications, this value determines whether the power-off phase of screen saving is enabled or not. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled, or FALSE if disabled.
SPI_GETPOWEROFFTIMEOUT
This flag is not supported for 32-bit applications on Windows NT or Windows 95.
Windows 95 only: For 16-bit Windows applications, this value retrieves the time-out value for the power-off phase of screen saving. The pvParam parameter must point to an integer value that receives the value.
SPI_GETSCREENREADER
Windows 95 only: Determines whether a screen reviewer utility is running. A screen reviewer utility directs textual information to an output device, such as a speech synthesizer or Braille display. When this flag is set, an application should provide textual information in situations where it would otherwise present the information graphically.
The pvParam parameter is a pointer to a BOOL variable that receives TRUE if a screen reviewer utility is running, or FALSE if it is not.
SPI_GETSCREENSAVEACTIVE
Determines whether screen saving is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled, or FALSE otherwise.
SPI_GETSCREENSAVETIMEOUT
Retrieves the screen saver time-out value, in seconds. The pvParam parameter must point to an integer variable that receives the value.
SPI_GETSERIALKEYS
Windows 95 only: Retrieves information about the SerialKeys accessibility feature. The pvParam parameter must point to a SERIALKEYS structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(SERIALKEYS).
SPI_GETSHOWSOUNDS
Determines whether the Show Sounds accessibility flag is on or off. If it is on, the user requires an application to present information visually in situations where it would otherwise present the information only in audible form. The pvParam parameter must point to a BOOL variable that receives TRUE if the feature is on, or FALSE if it is off.
Using this value is equivalent to calling GetSystemMetrics (SM_SHOWSOUNDS). That is the recommended call.
SPI_GETSNAPTODEFBUTTON
Windows NT only: Determines whether the snap-to-default-button feature is enabled. If enabled, the mouse cursor automatically moves to the default button, such as “OK” or “Apply”, of a dialog box. The pvParam parameter must point to a BOOL variable that receives TRUE if the feature is on, or FALSE if it is off.
SPI_GETSOUNDSENTRY
Retrieves information about the SoundSentry accessibility feature. The pvParam parameter must point to a SOUNDSENTRY structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(SOUNDSENTRY).
SPI_GETSTICKYKEYS
Retrieves information about the StickyKeys accessibility feature. The pvParam parameter must point to a STICKYKEYS structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(STICKYKEYS).
SPI_GETTOGGLEKEYS
Retrieves information about the ToggleKeys accessibility feature. The pvParam parameter must point to a TOGGLEKEYS structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(TOGGLEKEYS).
SPI_GETWHEELSCROLLLINES
Windows NT only: Gets the number of lines to scroll when the mouse wheel is rotated. The number of lines is returned in a UINT pointed to by pvParam. The default value is 3.
SPI_GETWINDOWSEXTENSION
Windows 95 only: Indicates whether the Windows extension, Windows Plus!, is installed. Set the uiParam parameter to 1. The pvParam parameter is not used. The function returns TRUE if the extension is installed, or FALSE if it is not.
SPI_GETWORKAREA
Retrieves the size of the working area. The working area is the portion of the screen not obscured by the tray. The pvParam parameter must point to the RECT structure that receives the coordinates of the working area.
SPI_ICONHORIZONTALSPACING
Sets the width of an icon cell. The uiParam parameter specifies the width, in pixels.
SPI_ICONVERTICALSPACING
Sets the height of an icon cell. The uiParam parameter specifies the height, in pixels.
SPI_LANGDRIVER
Not implemented.
SPI_SCREENSAVERRUNNING
Windows 95 only: Used internally; applications should not use this flag.
SPI_SETACCESSTIMEOUT
Sets the time-out period associated with the accessibility features. The pvParam parameter must point to an ACCESSTIMEOUT structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(ACCESSTIMEOUT).
SPI_SETANIMATION
Sets the animation effects associated with user actions. The pvParam parameter must point to an ANIMATIONINFO structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(ANIMATIONINFO).
SPI_SETBEEP
Turns the warning beeper on or off. The uiParam parameter specifies TRUE for on, or FALSE for off.
SPI_SETBORDER
Sets the border multiplier factor that determines the width of a window’s sizing border. The uiParam parameter specifies the new value.
SPI_SETDEFAULTINPUTLANG
Sets the default input language for the system shell and applications. The specified language must be displayable using the current system character set. The uiParam parameter is not used. The pvParam parameter must point to a 32-bit variable that contains the keyboard layout handle for the default language.
SPI_SETDESKPATTERN
Sets the current desktop pattern by causing Windows to read the Pattern= setting from the WIN.INI file.
SPI_SETDESKWALLPAPER
Sets the desktop wallpaper. The pvParam parameter must point to a null-terminated string containing the name of a bitmap file.
SPI_SETDOUBLECLICKTIME
Sets the double-click time for the mouse to the value of the uiParam parameter. The double-click time is the maximum number of milliseconds that can occur between the first and second clicks of a double-click.
SPI_SETDOUBLECLKHEIGHT
Sets the height of the double-click rectangle to the value of the uiParam parameter.
The double-click rectangle is the rectangle within which the second click of a double-click must fall for it to be registered as a double-click.
SPI_SETDOUBLECLKWIDTH
Sets the width of the double-click rectangle to the value of the uiParam parameter.
The double-click rectangle is the rectangle within which the second click of a double-click must fall for it to be registered as a double-click.
SPI_SETDRAGFULLWINDOWS
Sets dragging of full windows either on or off. The uiParam parameter specifies TRUE for on, or FALSE for off.
Windows 95: This flag is supported only if Windows Plus! is installed. See SPI_GETWINDOWSEXTENSION.
SPI_SETDRAGHEIGHT
Sets the height, in pixels, of the rectangle used to detect the start of a drag operation.
See SM_CXDRAG and SM_CYDRAG in the table under the nIndex parameter of GetSystemMetrics.
SPI_SETDRAGWIDTH
Sets the width, in pixels, of the rectangle used to detect the start of a drag operation.
See SM_CXDRAG and SM_CYDRAG in the table under the nIndex parameter of GetSystemMetrics.
SPI_SETFASTTASKSWITCH
This flag is obsolete. Previous versions of Windows use this flag to enable or disable ALT+TAB fast task switching. Beginning with Windows 95 and Windows NT version 4.0, fast task switching is always enabled.
SPI_SETFILTERKEYS
Sets the parameters of the FilterKeys accessibility feature. The pvParam parameter must point to a FILTERKEYS structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(FILTERKEYS).
SPI_SETFONTSMOOTHING
Enables or disables the font smoothing feature, which uses font anti-aliasing to make font curves appear smoother by painting pixels at different gray levels.
To enable the feature, set the uiParam parameter to TRUE. To disable the feature, set uiParam to FALSE.
Windows 95: This flag is supported only if Windows Plus! is installed. See SPI_GETWINDOWSEXTENSION.
SPI_SETGRIDGRANULARITY
Sets the granularity of the desktop sizing grid to the value of the uiParam parameter.
SPI_SETHANDHELD
Used internally; applications should not use this value.
SPI_SETHIGHCONTRAST
Windows 95 only: Sets the parameters of the HighContrast accessibility feature. The pvParam parameter must point to a HIGHCONTRAST structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(HIGHCONTRAST).
SPI_SETICONMETRICS
Sets the metrics associated with icons. The pvParam parameter must point to an ICONMETRICS structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(ICONMETRICS).
SPI_SETICONTITLELOGFONT
Sets the font that is used for icon titles. The uiParam parameter specifies the size of a LOGFONT structure, and the pvParam parameter must point to a LOGFONT structure.
SPI_SETICONTITLEWRAP
Turns icon-title wrapping on or off. The uiParam parameter specifies TRUE for on, or FALSE for off.
SPI_SETKEYBOARDDELAY
Sets the keyboard repeat-delay setting to the value of the uiParam parameter.
SPI_SETKEYBOARDPREF
Windows 95 only: Sets the keyboard preference. The uiParam parameter specifies TRUE if the user relies on the keyboard instead of the mouse, and wants applications to display keyboard interfaces that would otherwise be hidden; uiParam is FALSE otherwise.
SPI_SETKEYBOARDSPEED
Sets the keyboard repeat-speed setting to the value of the uiParam parameter.
SPI_SETLANGTOGGLE
Sets the hot key set for switching between input languages. The uiParam and pvParam parameters are not used. The value sets the shortcut keys in the keyboard property sheets by reading the registry again. The registry must be set before this flag is used. the path in the registry is \HKEY_CURRENT_USER\keyboard layout\toggle. Valid values are “1” = alt+shift, “2” = ctrl+shift, and “3” = none.
SPI_SETLOWPOWERACTIVE
Windows 95 only: Activates or deactivates the low-power phase of screen saving. Set uiParam to 1 to activate, or 0 to deactivate. The pvParam parameter must be NULL.
SPI_SETLOWPOWERTIMEOUT
Windows 95 only: Retrieves the time-out value, in seconds, for the low-power phase of screen saving. The uiParam parameter specifies the new value. The pvParam parameter must be NULL.
SPI_SETMENUDROPALIGNMENT
Sets the alignment value of pop-up menus. The uiParam parameter specifies TRUE for right alignment, or FALSE for left alignment.
SPI_SETMINIMIZEDMETRICS
Sets the metrics associated with minimized windows. The pvParam parameter must point to a MINIMIZEDMETRICS structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(MINIMIZEDMETRICS).
SPI_SETMOUSE
Sets the two mouse threshold values and the mouse speed. The pvParam parameter must point to an array of three integers that specifies these values. See mouse_event for further information.
SPI_SETMOUSEBUTTONSWAP
Swaps or restores the meaning of the left and right mouse buttons. The uiParam parameter specifies TRUE to swap the meanings of the buttons, or FALSE to to restore their original meanings.
SPI_SETMOUSEHOVERHEIGHT
Windows NT only: Sets the height, in pixels, of the rectangle within which the mouse pointer has to stay for TrackMouseEvent to generate a WM_MOUSEHOVER message. The height is set from the uiParam parameter.
SPI_SETMOUSEHOVERTIME
Windows NT only: Sets the time, in milliseconds, that the mouse pointer has to stay in the hover rectangle for TrackMouseEvent to generate a WM_MOUSEHOVER message. This is used only if you pass HOVER_DEFAULT in the dwHoverTime parameter in the call to TrackMouseEvent. The time is set from the uiParam parameter.
SPI_SETMOUSEHOVERWIDTH
Windows NT only: Sets the width, in pixels, of the rectangle within which the mouse pointer has to stay for TrackMouseEvent to generate a WM_MOUSEHOVER message. The width is set from the uiParam parameter.
SPI_SETMOUSEKEYS
Sets the parameters of the MouseKeys accessibility feature. The pvParam parameter must point to a MOUSEKEYS structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(MOUSEKEYS).
SPI_SETMOUSETRAILS
Windows 95 only: Enables or disables the Mouse Trails feature, which improves the visibility of mouse cursor movements by briefly showing a trail of cursors and quickly erasing them.
To disable the feature, set the uiParam parameter to zero or 1. To enable the feature, set uiParam to a value greater than 1 to indicate the number of cursors drawn in the trail.
SPI_SETNONCLIENTMETRICS
Sets the metrics associated with the nonclient area of nonminimized windows. The pvParam parameter must point to a NONCLIENTMETRICS structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(NONCLIENTMETRICS).
SPI_SETPENWINDOWS
Windows 95 only: Specifies that pen windows is being loaded or unloaded. The uiParam parameter is TRUE when loading and FALSE when unloading pen windows. The pvParam parameter is NULL.
SPI_SETPOWEROFFACTIVE
Windows 95 only: Activates or deactivates the power-off phase of screen saving. Set uiParam to 1 to activate, or 0 to deactivate. The pvParam parameter must be NULL.
SPI_SETPOWEROFFTIMEOUT
Windows 95 only: Retrieves the time-out value, in seconds, for the power-off phase of screen saving. The uiParam parameter specifies the new value. The pvParam parameter must be NULL.
SPI_SETSCREENREADER
Windows 95 only: Indicates whether a screen review utility is running. The uiParam parameter specifies TRUE for on, or FALSE for off.
SPI_SETSCREENSAVEACTIVE
Sets the state of the screen saver. The uiParam parameter specifies TRUE to activate screen saving, or FALSE to deactivate it.
SPI_SETSCREENSAVETIMEOUT
Sets the screen saver time-out value to the value of the uiParam parameter. This value is the amount of time, in seconds, that the system must be idle before the screen saver activates.
SPI_SETSERIALKEYS
Windows 95 only: Sets the parameters of the SerialKeys accessibility feature. The pvParam parameter must point to a SERIALKEYS structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(SERIALKEYS).
SPI_SETSHOWSOUNDS
Sets the ShowSounds accessibility feature as on or off. The uiParam parameter specifies TRUE for on, or FALSE for off.
SPI_SETSNAPTODEFBUTTON
Windows NT only: Enables or disables the snap-to-default-button feature. If enabled, the mouse cursor automatically moves to the default button, such as “OK” or “Apply”, of a dialog box. Set the uiParam parameter to TRUE to enable the feature, or FALSE to disable it.
SPI_SETSOUNDSENTRY
Sets the parameters of the SoundSentry accessibility feature. The pvParam parameter must point to a SOUNDSENTRY structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(SOUNDSENTRY).
SPI_SETSTICKYKEYS
Sets the parameters of the StickyKeys accessibility feature. The pvParam parameter must point to a STICKYKEYS structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(STICKYKEYS).
SPI_SETTOGGLEKEYS
Sets the parameters of the ToggleKeys accessibility feature. The pvParam parameter must point to a TOGGLEKEYS structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(TOGGLEKEYS).
SPI_SETWHEELSCROLLLINES
Windows NT only: Sets the number of lines to scroll when the mouse wheel is rotated. The number of lines is set from the uiParam parameter.
The number of lines is the suggested number of lines to scroll when the mouse wheel is rolled without using modifier keys. If the number is 0, then no scrolling should occur. If the number of lines to scroll is greater than the number of lines viewable, and in particular if it is WHEEL_PAGESCROLL (#defined as UINT_MAX), the scroll operation should be interpreted as clicking once in the page down or page up regions of the scroll bar.
SPI_SETWORKAREA
Sets the size of the work area. The work area is the portion of the screen not obscured by the taskbar. The pvParam parameter must point to the RECT structure that contains the coordinates of the work area.

· uiParam
Depends on the system parameter being queried or set. For more information about systemwide parameters, see the uiAction parameter. If not otherwise indicated, specify zero.

· pvParam
Depends on the system parameter being queried or set. For more information about systemwide parameters, see the uiAction parameter. If not otherwise indicated, specify NULL.

· fWinIni
If a system parameter is being set, specifies whether the user profile is to be updated, and if so, whether the WM_SETTINGCHANGE message is to be broadcast to all top-level windows to notify them of the change. This parameter can be zero or can be one of the following values:
SPIF_UPDATEINIFILE
Writes the new system-wide parameter setting to the user profile.
SPIF_SENDCHANGE
Broadcasts the WM_SETTINGCHANGE message after updating the user profile.
SPIF_SENDWININICHANGE
Same as SPIF_SENDCHANGE.

Return Values
If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Examples

Related Functions

 

 


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