Perl Win32::API() call() function -

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dear all, trying value of char pointer or string in return of call() function dll. dll having function randomdec(long , int*) , returns string. call using win32::api(). have tried , didn't succeed. plz help

use win32::api;   @lpbuffer = " " x 20;    $pp= \@lpbuffer;   $xy=0;   $ff= \$xy;   $fun2 = new win32::api('my.dll','randomdec','np','**p**')or die $^e;   $pp = $fun2->call(4,$ff);

how using $pp ?

there multiple errors in code.

  1. my @lpbuffer = " " x 20; $pp= \@lpbuffer;

=> my $pp = " " x 20;

you mixing arrays strings, , don't need perl ref c ptr. similar int*.

  1. n number not long. l unsigned, need signed, l.
     use win32::api;     $pp = " " x 20;   # alloc string     $xy = 0;          # alloc int     $fun2 = new win32::api('my.dll','randomdec','lp','p') or die $^e;       $pp = $fun2->call(4,$xy);

i haven't check if win32::api can lvalue assignment char*. not, $pp foreign pointer string after call, , prev. pv slot $pp lost, , inaccessible perl. ffi's , winapi return int, not strings. strings via sideeffects, function arg.


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