Hi Todd, According to this: https://docs.microsoft.com/en-us/windows/win32/debug/system-error-codes--0-499- Return code 161 means: ERROR_BAD_PATHNAME. Changing your code fixed that: my Str $SubKey = 'SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System'; my $lpValueName = wstr('EnableLUA');
Then the return code of the RegQueryValueExW is 87. According to the page above, that means ERROR_INVALID_PARAMETER. Because of that I looked at the RegQueryValueExW help page you linked and noticed that it says: lpReserved This parameter is reserved and must be *NULL*. In your code there is a 1 given. Unfortunately, just a 0 does not helped. Here, I have no idea how a NULL is given. Regards, Wolf On Fri, 27 Dec 2019 at 08:22, WFB <wbi...@gmx.at> wrote: > I would love to look into that, however, my son needs all my free time and > I do have very little knowledge about NativeCall. > I hope I will find time in the next days to learn more of this stuff, but > I will not much help :-( > > > On Fri, 27 Dec 2019 at 07:31, ToddAndMargo via perl6-users < > perl6-users@perl.org> wrote: > >> This is how far I have gotten: >> >> Note that is I use a "0" in >> >> $RtnCode = RegQueryValueExW( HKEY_LOCAL_MACHINE, $lpValueName, 1, >> REG_DWORD, $lpData, $lpcbData ); >> >> The program dies with no return code. >> >> -T >> >> >> >> K:\Windows\NtUtil>perl6 -I. -e "use WinMount :GetLUA; say >> GetLUA();" >> RegOpenKeyExW >> RegOpenKeyExW RtnCode 161 >> >> RegQueryValueExW >> 1 >> 2 >> RegQueryValueExW RtnCode 87 >> lpData pointer 0 >> lpcbData data length 0 >> >> RegCloseKey >> RegCloseKey RtnCode 6 >> >> True >> >> >> >> >> >> # unit module WinMount; >> # WinMount.pm6 >> >> #`{ >> >> Utilities to mount and dismound drive partitions >> Note: LUA must be unset (0x00000000) for mount to function >> prpoperly >> >> raku -I. -c WinMount.pm6 >> >> } >> >> use NativeCall; >> use WinPopUps :WinMsg; >> >> >> # Reference to types and values: >> http://dsource.org/projects/tango/ticket/820 >> >> constant BYTE := uint8; >> constant WCHAR := uint16; >> constant DWORD := int32; >> constant REGSAM := int32; >> constant WCHARS := CArray[WCHAR]; >> constant BYTES := CArray[BYTE]; >> >> constant HKEY_CURRENT_USER = 0x80000001; >> constant HKEY_LOCAL_MACHINE = 0x80000002; >> constant KEY_QUERY_VALUE = 1; >> constant ERROR_SUCCESS = 0; # Yeah, I know. The Win-Api >> uses 0 for success and other values to indicate errors >> constant REG_SZ = 1; >> >> constant KEY_READ = 0x20019; >> constant KEY_SET_VALUE = 0x0002; >> constant REG_DWORD = 0x00000004; >> >> >> >> sub to-c-str( Str $str ) returns CArray[WCHAR] is export( >> :to-c-str ) { >> my @str := CArray[WCHAR].new; >> for ( $str.comb ).kv -> $i, $char { @str[$i] = $char.ord; } >> @str[ $str.chars ] = 0; >> @str; >> } >> >> >> sub wstr( Str $str ) returns WCHARS is export( :wstr ) { >> CArray[WCHAR].new( $str.comb.map: *.ord ) >> } >> >> >> sub GetLUA() is export( :GetLUA ) { >> >> #`{ >> >> Returns the LUA value in the registry to True (0x00000001) or >> False (0x00000000) >> >> >> >> [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System] >> "EnableLUA"=dword:00000000 >> >> https://docs.perl6.org/language/nativecall >> >> } >> >> my Str $SubName = &?ROUTINE.name; >> my Str $OS = $*KERNEL.name; >> if not $OS eq "win32" { say "Sorry, $SubName only work in >> Windows."; exit; } >> >> my Bool $LUA = True; >> my $RtnCode; >> >> my Str $SubKey = >> '\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System'; >> my Str $Key = $SubKey ~ '\EnableLUA'; >> >> my $lpSubKey = wstr( $SubKey ); >> my $lpValueName = wstr( $Key ); >> # my $lpSubKey = CArray[uint8].new($Key.encode.list); >> # my $lpValueName = CArray[uint8].new($SubKey.encode.list); >> >> >> my int32 $Handle; >> my int32 $ulOptions = 0; >> my int32 $lpData; >> my int32 $lpcbData; >> >> >> #`{ >> Open the key: >> >> >> https://docs.microsoft.com/en-us/windows/win32/api/winreg/nf-winreg-regopenkeyexw >> >> >> https://docs.microsoft.com/en-us/windows/win32/sysinfo/registry-key-security-and-access-rights >> C++ >> LSTATUS RegOpenKeyExW( >> HKEY hKey, # Hive name (HKEY_LOCAL_MACHINE) >> LPCWSTR lpSubKey, # path to the >> key(/SOFTWARE/Microsoft/Windows/CurrentVersion/Policies/System/EnableLUA) >> DWORD ulOptions, # 0 >> REGSAM samDesired, # KEY_READ (0x20019), >> KEY_SET_VALUE (0x0002) >> PHKEY phkResult # A pointer to a variable that >> receives a handle to the opened key >> ); >> } >> say "RegOpenKeyExW"; >> sub RegOpenKeyExW( DWORD, WCHARS, DWORD, DWORD, DWORD is rw) >> is native("Kernel32.dll") returns DWORD { * }; >> $RtnCode = RegOpenKeyExW( HKEY_LOCAL_MACHINE, $lpSubKey, >> $ulOptions, KEY_READ, $Handle ); >> say "RegOpenKeyExW RtnCode $RtnCode\n"; >> >> >> >> #`{ >> Read the key: >> use RegQueryValueExW if you know key and value name >> >> >> https://docs.microsoft.com/en-us/windows/win32/api/winreg/nf-winreg-regqueryvalueexw >> C++ >> LSTATUS RegQueryValueExW( >> HKEY hKey, # Hive name (HKEY_LOCAL_MACHINE) >> LPCWSTR lpValueName, # path to the >> key(\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA) >> LPDWORD lpReserved, # give it "int32" without the >> quotes to give it a NULL >> LPDWORD lpType, # Registry Value Type (REG_DWORD >> which is 32 bit) >> LPBYTE lpData, # Pointer to the return value >> LPDWORD lpcbData # number of bytes in the return >> value >> ); >> } >> say "RegQueryValueExW"; >> sub RegQueryValueExW( DWORD, WCHARS, DWORD, DWORD, DWORD is >> rw, DWORD is rw ) is native("Kernel32.dll") returns DWORD { * }; >> say "1"; >> $RtnCode = RegQueryValueExW( HKEY_LOCAL_MACHINE, >> $lpValueName, 1, REG_DWORD, $lpData, $lpcbData ); >> say "2"; >> say "RegQueryValueExW RtnCode $RtnCode\nlpData pointer >> $lpData\nlpcbData data length $lpcbData\n"; >> >> >> >> #`{ >> Close the key >> >> >> https://docs.microsoft.com/en-us/windows/win32/api/winreg/nf-winreg-regclosekey >> C++ >> LSTATUS RegCloseKey( >> HKEY hKey # handle to the open key to be closed. See >> RegOpenKeyExW phkResult >> ); >> } >> say "RegCloseKey"; >> sub RegCloseKey( DWORD ) is native("Kernel32.dll") returns >> DWORD { * }; >> $RtnCode = RegCloseKey( $Handle ); >> say "RegCloseKey RtnCode $RtnCode\n"; >> >> >> return $LUA; >> } >> >