Пример программы QT с использованием libusb1.0?

Question

Я дебютирую в qt/C++, я использую ubuntu os. Я ищу образец программы, который поможет мне использовать libusb1.0 с qt.

Программа должна: Дисплей USB устройства, подключенные, чтения/записи данныхот/к USB-устройства.

Пожалуйста, мне нужна помощь.

Благодаря & & Привет

Answer 1

Я пытался с этим примером qt_lisbusb

При подключении к USB-устройства (флэш-диск, например), программа определяет, но не может открыть его.

код, который я использую:

void Qt_libusb::listview_populate_usb_devices() { 
    ui->listWidget->clear(); //clearing the list view 

    libusb_device_handle *device_handle; //handle to USB device 
    libusb_device_descriptor device_descriptor; //the device descriptor 
    libusb_device **device_list; //to store all found USB devices 
    libusb_context *ctx; //a libusb context for library intialization 
    ssize_t i; //for the device iterator for loop 
    ssize_t device_count; //holding number of devices in list 
    QString list_entry; //for using library outputs in char * in Qt framework 

    int r; //for return values 
    int progress_bar_value = 0; 
    int progress_bar_correction = 0; 
    char device_open = 0; //for checking whether a device was opened or not 
    unsigned char string_buffer_manufacturer[4096]; //for storing manufacturer descriptor 
    unsigned char string_buffer_product[4096]; //for storing product descriptor 
    const char *cc_manufacturer; //for the casting to use the string output from libusb in Qt 
    const char *cc_product; //for the casting to use the string output from libusb in Qt 

    r = libusb_init(&ctx); //initializing the library 

    //inform error on status bar 
    if(r < 0) ui->statusBar->showMessage("Error: Initializing libusb"); 

    else 
    { 
     //detecting all the connected devices 
     device_count = libusb_get_device_list(ctx, &device_list); 

     //inform error on status bar 
     if(device_count <= 0) ui->statusBar->showMessage("Info: No device found"); 

     else 
     { 
      //resetting the progress bar 
      ui->progressBar->reset(); 

      //for loop iterating through found devices 
      for(i=0;i<device_count;i++) 
      { 
       //getting device descriptor 
       r = libusb_get_device_descriptor(device_list[i], &device_descriptor); 

       //inform error on status bar 
       if(r < 0) ui->statusBar->showMessage("Error: Failed to get device descriptor"); 

       else 
       { 
        //opening the device 
        r = libusb_open(device_list[i],&device_handle); 

        if(r < 0) 
        { 
         //inform error on status bar 
         ui->statusBar->showMessage("Error: Opening USB device"); 
         //indicating that device is not open 
         device_open = 0; 
        } 

        else 
        { 
         //indicating that device is open 
         device_open = 1; 

         //getting the ASCII text value from the descriptor field 
         r = libusb_get_string_descriptor_ascii(device_handle,device_descriptor.iManufacturer,string_buffer_manufacturer,sizeof(string_buffer_manufacturer)); 

         if(r < 0) 
         { 
          //reporting error on the list entry 
          ui->listWidget->addItem("Error: Converting descriptor to ASCII [iManufacturer]"); 
          ui->listWidget->item(ui->listWidget->count() - 1)->setForeground(Qt::white); 
          ui->listWidget->item(ui->listWidget->count() - 1)->setBackground(Qt::red); 
         } 

         else 
         { 
          //getting the ASCII text value from the descriptor field 
          r = libusb_get_string_descriptor_ascii(device_handle,device_descriptor.iProduct,string_buffer_product,sizeof(string_buffer_product)); 

          if(r < 0) 
          { 
           //reporting error on the list entry 
           ui->listWidget->addItem("Error: Converting descriptor to ASCII [iProduct]"); 
           ui->listWidget->item(ui->listWidget->count() - 1)->setForeground(Qt::white); 
           ui->listWidget->item(ui->listWidget->count() - 1)->setBackground(Qt::red); 
          } 

          else 
          { 
           //converting the string to const char* 
           cc_manufacturer = (const char*)string_buffer_manufacturer; 
           QString manufacturer(cc_manufacturer); 

           //converting the string to const char* 
           cc_product = (const char*)string_buffer_product; 
           QString product(cc_product); 

           //constructing the string for list entry 
           list_entry = manufacturer + " " + product; 

           ui->listWidget->horizontalScrollBar(); 
           ui->listWidget->verticalScrollBar(); 
           ui->listWidget->addItem(list_entry); //adding the list entry 

           //closing opened USB device 
           if (device_open == 1) 
           { 
            //closing the deivce 
            libusb_close(device_handle); 
            //indicating that device is open 
            device_open = 0; 
           } 

           //calculate and set the progress bar value 
           progress_bar_value = (i+1) * (100/device_count); 

           //correcting value 
           if ((i+1) == device_count) 
           { 
            progress_bar_correction = 100 - progress_bar_value; 
            progress_bar_value = progress_bar_value + progress_bar_correction; 
           } 

           //setting the value 
           ui->progressBar->setValue(progress_bar_value); 
          } 
         } 
        } 
       } 
      } 
      //closing opened USB device 
      if (device_open == 1) 
      { 
       //closing the deivce 
       libusb_close(device_handle); 
       //indicating that device is open 
       device_open = 0; 
      } 
     } 
    } }