I've just noticed that if I take the OP's code out of the batch file, it works ok (no faults) though it still returns the wrong string.

Also, if I replace the OP's code in the batch file with: 
use Win32::API;

$function = new Win32::API("kernel32", "GetCommandLine", '', 'P');

$string = $function->Call();

print "string[".length($string)."] = '$string'\n";

[download]
then the batch file runs without error and $string no longer contains the additional trailing space - ie Win32::API and Inline are in complete agreement.

A problem with the Import method perhaps ? ... I've never trusted it.

Cheers,
Rob
Update: As BrowserUk has subsequently demonstrated, it's the pack('Z*', ...) that leads to the extra trailing space - nothing to do with Win32::API->Import() at all.

In reply to Re^5: Win32::API Memory Exception with GetCommandLine() (which returns a static string) by syphilis
in thread Win32::API Memory Exception with GetCommandLine() (which returns a static string) by Wyrdweaver

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