utf-16 - Perl6 NativeCall with Str 被编码为 ('utf16' ) 得到随机损坏的结果

Question

我正在映射 GetFullPathName使用 NativeCall 的 perl6 脚本中的 windows API ，因此我写了以下内容:

#!perl6
use NativeCall;
constant \WIN32_MAX_PATH = 260;    

#I may use directly $path.IO.absolute()
sub Win32-GetFullPathName(
        Str $lpFileName is encoded('utf16'),
        int32 $nBufferLength, 
        #Str $lpBuffer is encoded('utf16') is rw,
        Blob $lpBuffer is rw,
        Str $lpFilenameIndex is rw)
    returns int32
    is native('kernel32.dll') 
    is symbol('GetFullPathNameW') 
    { * }


my $path = '.';
my $fp-size = Win32-GetFullPathName(
        $path, # $path ~ "\0", # <!-- this hack make it working fine
        WIN32_MAX_PATH, 
        #my Str $fpath = ' ' x WIN32_MAX_PATH;
        my $buffer = buf16.allocate(WIN32_MAX_PATH), 
        Str );
put "[$fp-size] => ", $buffer.decode('utf16').substr(0, $fp-size);

代码随机运行，直到我附加一个 "\0"之后 $path .
[编辑] 多次调用的结果:

[12] => D:\dev\pa.t

[12] => D:\dev\pa.

[12] => D:\dev\pa.槟

[9] => D:\dev\pa

[9] => D:\dev\pa

有没有另一种正确的方法来做到这一点？

Answer 1

我怀疑 src/strings/utf16.c 中存在 MoarVM 错误，特别是line 403 :

result = MVM_realloc(result, *output_size);

这可能应该读

result = MVM_realloc(result, *output_size + 2);

如果您可以验证这是否解决了您的问题，请随时联系 file a bug report甚至 create a pull request .