DOCUMENT:Q110662 12-NOV-1999 [win16sdk] TITLE :BUG: SystemParametersInfo() Does Not Modify WIN.INI PRODUCT :Microsoft Windows Software Development Kit PROD/VER:WINDOWS:3.1 OPER/SYS: KEYWORDS:kb16bitonly kbSysSettings kbGrpDSUser kbOSWin310bug ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows Software Development Kit (SDK) 3.1 ------------------------------------------------------------------------------- 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 Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310 Version : WINDOWS:3.1 Issue type : kbbug ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.