I post this message in google groups for help as well. Here is what I want to achieve: Have the GUI up, use thread to process the data (read from file) and Excel OLE to output the data. I don't want my GUI to freeze up when it's running. I got the script going but I got couple of errors below. Any help would be great. Thanks a lot. 
Attempt to free non-existent shared string '_TK_RESULT_', Perl 
interpreter: 0x2e 
e14dc at C:\Documents and Settings\slickuser\Desktop\thread3.pl line 
22. 
Tk::Error: Can't call method "Call" on an undefined value at C:/Perl/ 
site/lib/Tk 
/After.pm line 89. 
 [once,[{},after#7,idle,once,[ConfigChanged,{},{}]]] 
 ("after" script) 
Tk::Error: Can't call method "Call" on an undefined value at C:/Perl/ 
site/lib/Tk 
/After.pm line 89. 
 [once,[{},after#8,idle,once,[ConfigChanged,{},{}]]] 
 ("after" script) 
Attempt to free non-existent shared string 'Value', Perl interpreter: 
0x22485c a 
t (eval 9) line 1. 
Free to wrong pool 222da8 not 2ed3ec8 at (eval 9) line 1.

[download]
Here is my code: 
use strict; 
use warnings; 
use Tk; 
use threads; 
my $thr; 
 
my $mainWindow = MainWindow->new; 
my $textBox = $mainWindow->Scrolled("Text", -width=>80, -height=>7, 
      -scrollbars=>"ose", -wrap=>"word")->pack(); 
 
my $goBut = $mainWindow->Button(-foreground=>"blue", -text=>"Click", 
                   -command=>sub { $thr = threads->new(\&excecute) } )
+- 
 
>pack(); 
 
my $stopBut = $mainWindow->Button(-foreground=>"red", -text=>"Exit", 
                   -command=>sub{ if(defined($thr)){ $thr->detach; } 
exit; })->pack(); 
 
MainLoop; 
 
sub excecute 
{ 
        $goBut->configure(-state=>"disabled"); 
        $textBox->configure(-state=>"normal"); 
        open(FILE,"C:/file.txt") or die "Can't open file.\n"; 
        while(<FILE>) 
        { 
                my $message = $_; 
                $textBox->insert('end', $message); 
        } 
        close(FILE); 
 
        $textBox->configure(-state=>"disabled"); 
        $textBox->see('end'); 
 
        use Win32::OLE; 
        use Win32::OLE::Const 'Microsoft Excel'; 
 
        my ($Excel,$Workbook,$fileOutput,$CurrentSheet,$Range); 
        $fileOutput = "C:/test.xls"; 
 
        $Excel = Win32::OLE->new('Excel.Application', 'Quit') || die "
+Can't 
create Excel object. \n"; 
        $Excel->{'Visible'}                  = 1;    #0 is hidden, 1 i
+s visible 
        $Excel->{DisplayAlerts}              = 0;    #0 is hide alerts
+ 
        $Excel->{SheetsInNewWorkbook}        = 1; 
        $Workbook = $Excel->Workbooks->Add(); 
 
        $Workbook->SaveAs($fileOutput) or die "Can't save Excel.\n"; 
        $CurrentSheet = $Workbook->Worksheets(1); 
        $CurrentSheet->Select; 
 
        for (my $i=1; $i<=65356; $i++) 
        { 
                $Range = $CurrentSheet->Range("A$i"); 
                $Range->{Value} = $i; 
                sleep(0.01); 
        } 
 
        $Workbook->Save(); 
        $Workbook->Close(); 
        $Excel->Quit(); 
        Win32::OLE->FreeUnusedLibraries(); 
        $goBut->configure(-state=>"normal"); 
 
        return;

[download]

In reply to Tk & threads & Excel OLE?? by Slickuser

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