Detect USB drive and its related information.

luca.cossaro

Hi,

if you want do to that on Windows:

register to device notification
@
DEFINE_GUID(GUID_DEVINTERFACE_USB_DEVICE, 0xA5DCBF10L, 0x6530, 0x11D2, 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED);

// ...

DEV_BROADCAST_DEVICEINTERFACE NotificationFilter;

ZeroMemory( &NotificationFilter, sizeof(NotificationFilter) );
NotificationFilter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
NotificationFilter.dbcc_classguid = GUID_DEVINTERFACE_USB_DEVICE;

HDEVNOTIFY hDevNotify = RegisterDeviceNotification(winId, &NotificationFilter, DEVICE_NOTIFY_WINDOW_HANDLE);
@

in winEvent check the message:
@
if (WM_DEVICECHANGE == message->message) {

switch(message->wParam) {
case DBT_DEVICEARRIVAL:
msgType = "WM_DEVICECHANGE DBT_DEVICEARRIVAL: ";
interest = true;
// device plugged in
break;

    case DBT_DEVICEREMOVECOMPLETE :
        msgType = "WM_DEVICECHANGE DBT_DEVICEREMOVECOMPLETE: ";
        interest = true;
        // device plugged out
        break;
    }

}

if (interest) {
DEV_BROADCAST_HDR* pMsgPtr = (DEV_BROADCAST_HDR*)message->lParam;
if (pMsgPtr) {
switch (pMsgPtr->dbch_devicetype) {
case DBT_DEVTYP_DEVICEINTERFACE:
// retrieve vid and pid
break;
case DBT_DEVTYP_VOLUME:
DEV_BROADCAST_VOLUME* volume = (DEV_BROADCAST_VOLUME*)pMsgPtr;
// volume gives you all information on mount point
break;
}
}
}
@

vivekmalik2466

i want to get

list of drives
2.total size
3.used space
4.free space

vivekmalik2466

Dear can you please let me know all the respective header files .i am unable to register it.

luca.cossaro

Hi,

these are the headers:
@
#include <initguid.h>
#include <dbt.h>
@

for information on disk space you can use GetDiskFreeSpaceEx (see "MSDN":http://msdn.microsoft.com/en-us/library/windows/desktop/aa364937.aspx for documentation)

mxb7642

I am probably missing something obvious, but when trying to compile this code, I get the following errors:

mainwindow.cpp: In constructor 'MainWindow::MainWindow(QWidget*)':
mainwindow.cpp:19: error: 'DEV_BROADCAST_DEVICEINTERFACE' was not declared in this scope
mainwindow.cpp:24: error: 'DEVICE_NOTIFY_WINDOW_HANDLE' was not declared in this scope
mainwindow.cpp:24: error: 'RegisterDeviceNotificationW' was not declared in this scope

I've included initguid.h, dbt.h, as well as windows.h and winuser.h. Am I missing something?

tobias.hunger

That is of course not at all portable. If you care about other platforms you could put this code behind a nice interface that can get extended to other platforms later.

mxb7642

That is what I intend to do but the errors I'm getting are on Windows 7 professional SP1.

josh h

You need to specify which minimum version of Windows you are building for by setting WINVER. These routines were not available on older versions windows so they are only defined in the header files if WINVER is greater than or equal to 0x500.

Try adding the following line before you include the files windows.h and dbt.h:

#define WINVER 0x0501

You could also add the define to the project file.

See the following MSDN article for details on setting WINVER:
http://msdn.microsoft.com/en-gb/library/windows/desktop/aa383745

vivekmalik2466

this function give u the infomation of usb drive plz pass drive letter as parameter .

#include <winbase.h>
#include <windows.h>
#include <initguid.h>
#include <dbt.h>

@bool IsUsbDevice( wchar_t letter )
{
wchar_t volumeAccessPath[] = L"\\.\X:";
volumeAccessPath[4] = letter;

HANDLE deviceHandle = CreateFileW(
            volumeAccessPath,
            0,                // no access to the drive
            FILE_SHARE_READ | // share mode
            FILE_SHARE_WRITE,
            NULL,             // default security attributes
            OPEN_EXISTING,    // disposition
            0,                // file attributes
            NULL);            // do not copy file attributes

// setup query
STORAGE_PROPERTY_QUERY query;
memset(&query, 0, sizeof(query));
query.PropertyId = StorageDeviceProperty;
query.QueryType = PropertyStandardQuery;
//query.AdditionalParameters.

// issue query
DWORD bytes;
STORAGE_DEVICE_DESCRIPTOR devd;
STORAGE_BUS_TYPE busType = BusTypeUnknown;

if (DeviceIoControl(deviceHandle,
                    IOCTL_STORAGE_QUERY_PROPERTY,
                    &query, sizeof(query),
                    &devd, sizeof(devd),
                    &bytes, NULL))
{
    busType = devd.BusType;
    //qint64 abc=devd.Size;
    //GET_LENGTH_INFORMATION *sizeInfo;
    //DeviceIoControl(lDevice, IOCTL_DISK_GET_LENGTH_INFO, NULL, 0, sizeInfo, sizeof(sizeInfo), &junk, (LPOVERLAPPED) NULL);
} else {
    std::wcout << L"Failed to define bus type for: " << letter;
}
CloseHandle(deviceHandle);
return BusTypeUsb == busType;

}
@

CarlStenquist

Hi, please note that this thread deals with the USB class MSC, Mass Storage, only (right?) and so if the thread title were to be adjsted it would be more clear.
I'm searching for the HID class, but cannot find any Qt interface to it so far on Windows .