Everyone, I figured out a hokey way to make this all work with the Win32::API module. I changed the Win32::API::Type module as follows:

1. I changed the Unpack subroutine as follows
sub Unpack {
    my $type = $_[0];
    # ADDED
    if ($type eq "MYBUFFER*") {
        DEBUG "(PM)Type::Unpack: got packing 'c', is a pointer, unpack
+ing 'Z*' '$_[1]'\n";
        $_[1] = unpack("A*", $_[1]);
        DEBUG "(PM)Type::Unpack: returning '$_[1]'\n";
        return $_[1];
    }
    elsif(packing($type) eq 'c' and is_pointer($type)) {       
        DEBUG "(PM)Type::Unpack: got packing 'c', is a pointer, unpack
+ing 'Z*' '$_[1]'\n";
        $_[1] = unpack("Z*", $_[1]);
        DEBUG "(PM)Type::Unpack: returning '$_[1]'\n";
        return $_[1];
    }
    DEBUG "(PM)Type::Unpack: unpacking '".packing($type)."' '$_[1]'\n"
+; 
    $_[1] = unpack( packing($type), $_[1]);
    DEBUG "(PM)Type::Unpack: returning '$_[1]'\n";  
    return $_[1];
}

[download]

2. I added the following to the TYPE section

MYBUFFER                c

3. I added the following to the POINTER section

LPBUFFER                MYBUFFER

Then I changed my procedure declaration to GetShareMem as follows:

$GetSharedMem = Win32::API->new('shmdll', 'int GetSharedMem(int shareI
+ndex,MYBUFFER* lpszBuf, DWORD bufLength)');

[download]


Now I get the correct thing in the lpszBuf (Whoopee). Thanks for all your help!
Best Regards
Mike

In reply to Re: Problems Passing String Argument With Nulls From C To Perl by lamberms
in thread Problems Passing String Argument With Nulls From C To Perl by Anonymous Monk

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