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  1. or download this
    char TrackString[21];
char RouteString[12];
char BarString[66];
int RetCode;
__declspec (dllimport) int USPS4CB( char *TrackPtr, char *RoutePtr, ch
+ar *BarPtr);
  2. or download this
    use Win32::API;
$dll = new Win32::API("USPS4CB","USPS4CB",[P,P,P],I);</span><br />
...
$rc = $dll-&gt;Call($track,$route,$transbar);
$transbar =~ s/\0.*$//; 
print "$transbar \n";