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    <p>Just in case anyone else needs this, here's the converted C# code, which at last does work:</p> <pre><code> [DllImport( "user32.dll", EntryPoint = "SystemParametersInfo", SetLastError = false )] private static extern bool SystemParametersInfo( uint action, uint param, ref SKEY vparam, uint init ); [DllImport( "user32.dll", EntryPoint = "SystemParametersInfo", SetLastError = false )] private static extern bool SystemParametersInfo( uint action, uint param, ref FILTERKEY vparam, uint init ); private const uint SPI_GETFILTERKEYS = 0x0032; private const uint SPI_SETFILTERKEYS = 0x0033; private const uint SPI_GETTOGGLEKEYS = 0x0034; private const uint SPI_SETTOGGLEKEYS = 0x0035; private const uint SPI_GETSTICKYKEYS = 0x003A; private const uint SPI_SETSTICKYKEYS = 0x003B; private static bool StartupAccessibilitySet = false; private static SKEY StartupStickyKeys; private static SKEY StartupToggleKeys; private static FILTERKEY StartupFilterKeys; private const uint SKF_STICKYKEYSON = 0x00000001; private const uint TKF_TOGGLEKEYSON = 0x00000001; private const uint SKF_CONFIRMHOTKEY = 0x00000008; private const uint SKF_HOTKEYACTIVE = 0x00000004; private const uint TKF_CONFIRMHOTKEY = 0x00000008; private const uint TKF_HOTKEYACTIVE = 0x00000004; private const uint FKF_CONFIRMHOTKEY = 0x00000008; private const uint FKF_HOTKEYACTIVE = 0x00000004; [StructLayout( LayoutKind.Sequential, CharSet = CharSet.Auto )] public struct SKEY { public uint cbSize; public uint dwFlags; } [StructLayout( LayoutKind.Sequential, CharSet = CharSet.Auto )] public struct FILTERKEY { public uint cbSize; public uint dwFlags; public uint iWaitMSec; public uint iDelayMSec; public uint iRepeatMSec; public uint iBounceMSec; } private static uint SKEYSize = sizeof( uint ) * 2; private static uint FKEYSize = sizeof( uint ) * 6; public static void ToggleAccessibilityShortcutKeys( bool ReturnToStarting ) { if ( !StartupAccessibilitySet ) { StartupStickyKeys.cbSize = Configuration.SKEYSize; StartupToggleKeys.cbSize = Configuration.SKEYSize; StartupFilterKeys.cbSize = Configuration.FKEYSize; SystemParametersInfo( SPI_GETSTICKYKEYS, SKEYSize, ref StartupStickyKeys, 0 ); SystemParametersInfo( SPI_GETTOGGLEKEYS, SKEYSize, ref StartupToggleKeys, 0 ); SystemParametersInfo( SPI_GETFILTERKEYS, FKEYSize, ref StartupFilterKeys, 0 ); StartupAccessibilitySet = true; } if ( ReturnToStarting ) { // Restore StickyKeys/etc to original state and enable Windows key SystemParametersInfo( SPI_SETSTICKYKEYS, SKEYSize, ref StartupStickyKeys, 0 ); SystemParametersInfo( SPI_SETTOGGLEKEYS, SKEYSize, ref StartupToggleKeys, 0 ); SystemParametersInfo( SPI_SETFILTERKEYS, FKEYSize, ref StartupFilterKeys, 0 ); } else { // Disable StickyKeys/etc shortcuts but if the accessibility feature is on, // then leave the settings alone as its probably being usefully used SKEY skOff = StartupStickyKeys; //if ( ( skOff &amp; SKF_STICKYKEYSON ) == 0 ) { // Disable the hotkey and the confirmation skOff.dwFlags &amp;= ~SKF_HOTKEYACTIVE; skOff.dwFlags &amp;= ~SKF_CONFIRMHOTKEY; SystemParametersInfo( SPI_SETSTICKYKEYS, SKEYSize, ref skOff, 0 ); } SKEY tkOff = StartupToggleKeys; //if ( ( tkOff &amp; TKF_TOGGLEKEYSON ) == 0 ) { // Disable the hotkey and the confirmation tkOff.dwFlags &amp;= ~TKF_HOTKEYACTIVE; tkOff.dwFlags &amp;= ~TKF_CONFIRMHOTKEY; rs = SystemParametersInfo( SPI_SETTOGGLEKEYS, SKEYSize, ref tkOff, 0 ); } FILTERKEY fkOff = StartupFilterKeys; //if ( ( fkOff &amp; FKF_FILTERKEYSON ) == 0 ) { // Disable the hotkey and the confirmation fkOff.dwFlags &amp;= ~FKF_HOTKEYACTIVE; fkOff.dwFlags &amp;= ~FKF_CONFIRMHOTKEY; SystemParametersInfo( SPI_SETFILTERKEYS, FKEYSize, ref fkOff, 0 ); } } } </code></pre> <p>Do note that I was unable to convert three of the IF statements from C++ (those are commented out). Microsoft recommends those, but I don't know a way to make them work in C#. Additionally, I'm not using sizeof() on the structs (instead manually creating variables for their size), because to do that would require unsafe code, and I don't want that to be a requirement for my particular program.</p>
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