Фильтрация _wfindfirst

//-----------------------------------------------------------------------------
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <dir.h>
#include <stdint.h>
#include <time.h>
//-----------------------------------------------------------------------------
uint32_t crc32_bitwise(
    const void* data,
    size_t length,
    uint32_t previousCrc32
) {
    unsigned int j;
    uint32_t crc = ~previousCrc32;
    unsigned char* current = (unsigned char*) data;
    while (length--) {
        crc ^= *current++;
        for (j = 0; j < 8; j++)
            crc = ((crc & 1)
              ? (crc >> 1) ^ 0xEDB88320
              : (crc >> 1));
    }
    return ~crc;
}
//-----------------------------------------------------------------------------
uint32_t crc32_file(const wchar_t* filename)
{
    FILE *file;
    int len;
    unsigned char buffer[1024] ;
   if ((file = _wfopen (filename, L"rb")) == NULL) {
      wprintf(L"'%s' can't be opened\n", filename);
      return 0;
    }
    uint32_t crc32 = 0;
    while ((len = fread(buffer, 1, sizeof(buffer), file)) != 0) {
        crc32 = crc32_bitwise(buffer, len, crc32);
    }
    fclose(file);
    return crc32;
}
//-----------------------------------------------------------------------------
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
   ui->setupUi(this);
   _wfinddata_t f;
   int done = 0;
   system("mode con cols=126 lines=59");
   intptr_t handle = _wfindfirst(L"*.*", &f);
   if ( _wfindfirst(L".",&f) != 0)
   {
 
   }
   /*
   if ( _wfindfirst(L"..",&f) != 0)
   {
   }
   */
 
   int row =0;
 while (!done)
 {
 
    QTableWidgetItem *item = new QTableWidgetItem(QString::fromWCharArray(f.name));
    QTableWidgetItem *item1 = new QTableWidgetItem(QString::number(f.size/1000));
    QTableWidgetItem *item2 = new QTableWidgetItem(_ctime32(&f.time_create));
    QTableWidgetItem *item3 = new QTableWidgetItem(QString::number(crc32_file(f.name),16));
    ui->tableWidget->setRowCount(row+1);
    ui->tableWidget->setItem(row,0,item);
    ui->tableWidget->setItem(row,1,item1);
    ui->tableWidget->setItem(row,2,item2);
    ui->tableWidget->setItem(row,3,item3);
    row++;
    done = _wfindnext(handle,&f);
 }
   _findclose(handle);
}
MainWindow::~MainWindow()
{
    delete ui;
}
//-----------------------------------------------------------------------------