Microsoft KB Archive/110662

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BUG: SystemParametersInfo Does Not Modify WIN.INI

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Q110662

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The information in this article applies to:


 * Microsoft Windows Software Development Kit (SDK) 3.1

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SYMPTOMS
When a program uses the SystemParametersInfo function with the SPI_SETMOUSEBUTTONSWAP and SPIF_UPDATEINIFILE flags to reverse the mouse buttons' orientation and modify WIN.INI, the appropiate changes to WIN.INI are not made. The next time Windows starts, the buttons are back to the default orientation.

CAUSE
Calling SystemParametersInfo (SPI_SETMOUSEBUTTONSWAP, TRUE, NULL, SPIF_UPDATEINIFILE), modifies or creates the SwapMouseButtons entry in the "Windows" section of WIN.INI. However, the value this function writes is "1", unlike the Control Panel's mouse applet which writes "Yes".

"Yes", not "1", is the value recognized to swap the buttons during the startup of Windows. When Windows loads the settings from WIN.INI, Windows looks for the "SwapMouseButtons" entry in the "Windows" section, expecting a value of "Yes". If another value is encountered, Windows defaults to "No", which will cause Windows to use the default orientation of the mouse buttons.

RESOLUTION
An alternative way to swap the mouse buttons and modify the entry correctly is to use both SwapMouseButton and WriteProfileString to alter the mouse button orientation and explicitly modify the initialization file. The following code shows the method explained:

 : : SwapMouseButton (TRUE); WriteProfileString ("Windows", "SwapMouseButtons", "Yes"); : :

STATUS
Microsoft has confirmed this to be a bug in the Microsoft Windows SDK version 3.1.

Additional query words:

Keywords : kb16bitonly kbSysSettings kbGrpDSUser kbOSWin310bug

Issue type : kbbug

Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310