Re^4: Win32::API::Struct: Pointers of Pointers

okay. i get 87 as a result, which means: The parameter is incorrect.

now i tried the following:

sub query_users {
    my ( $self, $filename ) = @_;

    my $func =
      import_api( 'advapi32', 'QueryUsersOnEncryptedFile', 'PP', 'N' )
+;        
    die "Could not import API QueryUsersOnEncryptedFile: $!"
      unless defined $func;
      
    $filename = make_unicode( File::Spec->canonpath($filename) );   
    print "filename: $filename\n";

    my $encCertHashList = Win32::API::Struct->new( 'ENCRYPTION_CERTIFI
+CATE_HASH_LIST' );     
    print "retval: " . $func->Call( $filename, $encCertHashList) . "\n
+";        
    print $encCertHashList->{nCert_Hash}, "\n";
    
    $encCertHashList = Win32::API::Struct->new( 'ENCRYPTION_CERTIFICAT
+E_HASH_LIST' );     
    print "retval: " . $func->Call( $filename, \$encCertHashList) . "\
+n";
    print $encCertHashList->{nCert_Hash}, "\n";
    
    $encCertHashList = " " x 1024;
    print "retval: " . $func->Call( $filename, $encCertHashList) . "\n
+";
    print $encCertHashList, "\n";
    
    $encCertHashList = " " x 1024;
    print "retval: " . $func->Call( $filename, \$encCertHashList) . "\
+n";    
    print $encCertHashList, "\n";        
}
[download]

as a result i get

filename: C : \ e f s . p l
retval: 0
Use of uninitialized value in print at C:/Perl/site/lib/Win32/Security
+/EFS.pm line 180, <DATA> line 164.

retval: 0
Use of uninitialized value in print at C:/Perl/site/lib/Win32/Security
+/EFS.pm line 184, <DATA> line 164.

retval: 0
@¤&#9830;








retval: 0
[download]

in this case, the call works. but the structure is not really filled.
btw. the file is encrypted!

Comment on Re^4: Win32::API::Struct: Pointers of Pointers Select or Download Code

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Re^5: Win32::API::Struct: Pointers of Pointers by BrowserUk (Patriarch) on Jun 29, 2006 at 13:59 UTC
I'm getting much the same results. No errors, just nothing returned in the buffer :( I'm using the C source code from here as a reference. Maybe it will give you some clues I'm not seeing? I'll update if I have any success. Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal? "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice.	[reply]
Re^6: Win32::API::Struct: Pointers of Pointers by esskar (Deacon) on Jun 29, 2006 at 15:26 UTC
that's what i mean. it is a pointer of a pointer. The function alloactes the needed memory itself. here is the prove `sub query_users { my ( $self, $filename ) = @_; my $func = import_api( 'advapi32', 'QueryUsersOnEncryptedFile', 'P +P', 'N' ); die "Could not import API QueryUsersOnEncryptedFile: $!" unless defined $func; $filename = make_unicode( File::Spec->canonpath($filename) ); + my $ptr = " " x 4; # 4 == sizeof(void) my $result = $func->Call( "$filename", $ptr ); print "result: $result\n"; return undef if $result; my $address = unpack( "L", $ptr ); printf("0x%08x\n", $address); }` [download] i think i have to switch to XS at this point.	[reply] [d/l]
Re^7: Win32::API::Struct: Pointers of Pointers by BrowserUk (Patriarch) on Jun 29, 2006 at 18:44 UTC
In theory, this should work...but it doesn't. `#! perl -slw use strict; use Encode; use Devel::Peek; use Win32::API::Prototype; ApiLink( 'advapi32', q[ DWORD QueryUsersOnEncryptedFile( LPCWSTR lpFileName, ULONG pUsers ) ]) or die $^E; my $buffer = chr(0) x 4; print Dump( $buffer ); my $pointer = unpack 'L!', pack 'P', $buffer; printf "%08x\n", $pointer; my $uFile = encode( 'UTF-16LE', $_ = $ARGV[ 0 ], 1 ); print $uFile; QueryUsersOnEncryptedFile( $uFile, $pointer ) or die "$! : $^E"; print Dump( \$buffer ); print unpack 'C*',$buffer;` [download] Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal? "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice.	[reply] [d/l]


Think about Loose Coupling
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