winamp/Src/Plugins/Portable/pmp_ipod/eject.cpp

// this file almost totally copied from MSDN

#include <windows.h>
#include <stdio.h>
#include <winioctl.h>

#define LOCK_TIMEOUT  3000       // 10 Seconds
#define LOCK_RETRIES  20

#if 1 // old way
static HANDLE OpenVolume(TCHAR cDriveLetter)
{
    HANDLE hVolume;
    UINT   uDriveType;
    wchar_t   szVolumeName[8] = {0};
    wchar_t   szRootName[5] = {0};
    DWORD  dwAccessFlags = 0;
	cDriveLetter &= ~0x20; // capitalize
    wsprintf(szRootName, L"%c:\\", cDriveLetter);

    uDriveType = GetDriveType(szRootName);
    switch(uDriveType) {
      case DRIVE_REMOVABLE:
           dwAccessFlags = GENERIC_READ | GENERIC_WRITE;
           break;
      case DRIVE_CDROM:
           dwAccessFlags = GENERIC_READ;
           break;
      default:
           printf("Cannot eject.  Drive type is incorrect.\n");
           return INVALID_HANDLE_VALUE;
    }

    wsprintf(szVolumeName, L"\\\\.\\%c:", cDriveLetter);

    hVolume = CreateFile( szVolumeName,
                          dwAccessFlags,
                          FILE_SHARE_READ | FILE_SHARE_WRITE,
                          NULL,
                          OPEN_EXISTING,
                          0,
                          NULL );

    if (hVolume == INVALID_HANDLE_VALUE)
      printf("CreateFile error %d\n", GetLastError());
    return hVolume;
}

static BOOL CloseVolume(HANDLE hVolume)
{
    return CloseHandle(hVolume);
}

static BOOL LockVolume(HANDLE hVolume)
{
    DWORD dwBytesReturned;
    DWORD dwSleepAmount;
    int nTryCount;

    dwSleepAmount = LOCK_TIMEOUT / LOCK_RETRIES;

    // Do this in a loop until a timeout period has expired
    for (nTryCount = 0; nTryCount < LOCK_RETRIES; nTryCount++) {
      if (DeviceIoControl(hVolume,
                          FSCTL_LOCK_VOLUME,
                          NULL, 0,
                          NULL, 0,
                          &dwBytesReturned,
                          NULL))
         return TRUE;

      Sleep(dwSleepAmount);
    }
    return FALSE;
}

static BOOL DismountVolume(HANDLE hVolume)
{
    DWORD dwBytesReturned;

    return DeviceIoControl( hVolume,
                            FSCTL_DISMOUNT_VOLUME,
                            NULL, 0,
                            NULL, 0,
                            &dwBytesReturned,
                            NULL);
}

static BOOL PreventRemovalOfVolume(HANDLE hVolume, BOOL fPreventRemoval)
{
    DWORD dwBytesReturned;
    PREVENT_MEDIA_REMOVAL PMRBuffer;

    PMRBuffer.PreventMediaRemoval = fPreventRemoval;

    return DeviceIoControl( hVolume,
                            IOCTL_STORAGE_MEDIA_REMOVAL,
                            &PMRBuffer, sizeof(PREVENT_MEDIA_REMOVAL),
                            NULL, 0,
                            &dwBytesReturned,
                            NULL);
}

static int AutoEjectVolume(HANDLE hVolume)
{
    DWORD dwBytesReturned;

    return DeviceIoControl( hVolume,
                            IOCTL_STORAGE_EJECT_MEDIA,
                            NULL, 0,
                            NULL, 0,
                            &dwBytesReturned,
                            NULL);
}

BOOL EjectVolume(TCHAR cDriveLetter)
{
    HANDLE hVolume;

    BOOL fAutoEject = FALSE;

    hVolume = OpenVolume(cDriveLetter);
    if (hVolume == INVALID_HANDLE_VALUE)
      return FALSE;

    // Lock and dismount the volume.
    if (LockVolume(hVolume) && DismountVolume(hVolume)) {
      // Set prevent removal to false and eject the volume.
      if (PreventRemovalOfVolume(hVolume, FALSE) && AutoEjectVolume(hVolume))
        fAutoEject = TRUE;
    }

    // Close the volume so other processes can use the drive.
    if (!CloseVolume(hVolume))
      return FALSE;

    if (fAutoEject) return TRUE;
    else return FALSE;
}
#else
#include <stdio.h>

#include <windows.h>

#include <Setupapi.h>
#include <winioctl.h>
#include <winioctl.h>
#include <cfgmgr32.h>
#pragma comment(lib, "setupapi.lib")
//-------------------------------------------------
//----------------------------------------------------------------------
// returns the device instance handle of a storage volume or 0 on error
//----------------------------------------------------------------------
static DEVINST GetDrivesDevInstByDeviceNumber(long DeviceNumber, UINT DriveType, const wchar_t* szDosDeviceName)
{
	bool IsFloppy = (wcsstr(szDosDeviceName, L"\\Floppy") != NULL); // who knows a better way?

	GUID* guid;

	switch (DriveType) {
	case DRIVE_REMOVABLE:
		if ( IsFloppy ) {
			guid = (GUID*)&GUID_DEVINTERFACE_FLOPPY;
		} else {
			guid = (GUID*)&GUID_DEVINTERFACE_DISK;
		}
		break;
	case DRIVE_FIXED:
		guid = (GUID*)&GUID_DEVINTERFACE_DISK;
		break;
	case DRIVE_CDROM:
		guid = (GUID*)&GUID_DEVINTERFACE_CDROM;
		break;
	default:
		return 0;
	}

	// Get device interface info set handle for all devices attached to system
	HDEVINFO hDevInfo = SetupDiGetClassDevs(guid, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);

	if (hDevInfo == INVALID_HANDLE_VALUE)	{
		return 0;
	}

	// Retrieve a context structure for a device interface of a device information set
	DWORD dwIndex = 0;
	long res;

	BYTE Buf[1024] = {0};
	PSP_DEVICE_INTERFACE_DETAIL_DATA pspdidd = (PSP_DEVICE_INTERFACE_DETAIL_DATA)Buf;
	SP_DEVICE_INTERFACE_DATA         spdid;
	SP_DEVINFO_DATA                  spdd;
	DWORD                            dwSize;
	
	spdid.cbSize = sizeof(spdid);

	while ( true )	{
		res = SetupDiEnumDeviceInterfaces(hDevInfo, NULL, guid, dwIndex, &spdid);
		if ( !res ) {
			break;
		}

		dwSize = 0;
		SetupDiGetDeviceInterfaceDetail(hDevInfo, &spdid, NULL, 0, &dwSize, NULL); // check the buffer size

		if ( dwSize!=0 && dwSize<=sizeof(Buf) ) {

			pspdidd->cbSize = sizeof(*pspdidd); // 5 Bytes!

			ZeroMemory(&spdd, sizeof(spdd));
			spdd.cbSize = sizeof(spdd);

			long res = SetupDiGetDeviceInterfaceDetail(hDevInfo, &spdid, pspdidd, dwSize, &dwSize, &spdd);
			if ( res ) {

				// in case you are interested in the USB serial number:
				// the device id string contains the serial number if the device has one,
				// otherwise a generated id that contains the '&' char...
				/*
				DEVINST DevInstParent = 0;
				CM_Get_Parent(&DevInstParent, spdd.DevInst, 0); 
				char szDeviceIdString[MAX_PATH] = {0};
				CM_Get_Device_ID(DevInstParent, szDeviceIdString, MAX_PATH, 0);
				printf("DeviceId=%s\n", szDeviceIdString);
				*/

				// open the disk or cdrom or floppy
				HANDLE hDrive = CreateFile(pspdidd->DevicePath, 0, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
				if ( hDrive != INVALID_HANDLE_VALUE ) {
					// get its device number
					STORAGE_DEVICE_NUMBER sdn;
					DWORD dwBytesReturned = 0;
					res = DeviceIoControl(hDrive, IOCTL_STORAGE_GET_DEVICE_NUMBER, NULL, 0, &sdn, sizeof(sdn), &dwBytesReturned, NULL);
					if ( res ) {
						if ( DeviceNumber == (long)sdn.DeviceNumber ) {  // match the given device number with the one of the current device
							CloseHandle(hDrive);
							SetupDiDestroyDeviceInfoList(hDevInfo);
							return spdd.DevInst;
						}
					}
					CloseHandle(hDrive);
				}
			}
		}
		dwIndex++;
	}

	SetupDiDestroyDeviceInfoList(hDevInfo);

	return 0;
}
//-------------------------------------------------



//-------------------------------------------------
BOOL EjectVolume(TCHAR DriveLetter)
{
	DriveLetter &= ~0x20; // uppercase

	if ( DriveLetter < 'A' || DriveLetter > 'Z' ) {
		return FALSE;
	}

	wchar_t szRootPath[] = L"X:\\";   // "X:\"  -> for GetDriveType
	szRootPath[0] = DriveLetter;

	wchar_t szDevicePath[] = L"X:";   // "X:"   -> for QueryDosDevice
	szDevicePath[0] = DriveLetter;

	wchar_t szVolumeAccessPath[] = L"\\\\.\\X:";   // "\\.\X:"  -> to open the volume
	szVolumeAccessPath[4] = DriveLetter;

	long DeviceNumber = -1;

	// open the storage volume
	HANDLE hVolume = CreateFileW(szVolumeAccessPath, 0, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, NULL, NULL);
	if (hVolume == INVALID_HANDLE_VALUE) {
		return FALSE;
	}

	// get the volume's device number
	STORAGE_DEVICE_NUMBER sdn;
	DWORD dwBytesReturned = 0;
	long res = DeviceIoControl(hVolume, IOCTL_STORAGE_GET_DEVICE_NUMBER, NULL, 0, &sdn, sizeof(sdn), &dwBytesReturned, NULL);
	if ( res ) {
		DeviceNumber = sdn.DeviceNumber;
	}
	CloseHandle(hVolume);

	if ( DeviceNumber == -1 ) {
		return FALSE;
	}

	// get the drive type which is required to match the device numbers correctely
	UINT DriveType = GetDriveType(szRootPath);

	// get the dos device name (like \device\floppy0) to decide if it's a floppy or not - who knows a better way?
	wchar_t szDosDeviceName[MAX_PATH] = {0};
	res = QueryDosDevice(szDevicePath, szDosDeviceName, MAX_PATH);
	if ( !res ) {
		return FALSE;
	}

	// get the device instance handle of the storage volume by means of a SetupDi enum and matching the device number
	DEVINST DevInst = GetDrivesDevInstByDeviceNumber(DeviceNumber, DriveType, szDosDeviceName);

	if ( DevInst == 0 ) {
		return FALSE;
	}

	PNP_VETO_TYPE VetoType = PNP_VetoTypeUnknown; 
	wchar_t VetoNameW[MAX_PATH] = {0};
	bool bSuccess = false;

	// get drives's parent, e.g. the USB bridge, the SATA port, an IDE channel with two drives!
	DEVINST DevInstParent = 0;
	res = CM_Get_Parent(&DevInstParent, DevInst, 0); 

	for ( long tries=1; tries<=3; tries++ ) { // sometimes we need some tries...

		VetoNameW[0] = 0;

		// CM_Query_And_Remove_SubTree doesn't work for restricted users
		//res = CM_Query_And_Remove_SubTreeW(DevInstParent, &VetoType, VetoNameW, MAX_PATH, CM_REMOVE_NO_RESTART); // CM_Query_And_Remove_SubTreeA is not implemented under W2K!
		//res = CM_Query_And_Remove_SubTreeW(DevInstParent, NULL, NULL, 0, CM_REMOVE_NO_RESTART);  // with messagebox (W2K, Vista) or balloon (XP)
		
		res = CM_Request_Device_EjectW(DevInstParent, &VetoType, VetoNameW, MAX_PATH, 0);
		//res = CM_Request_Device_EjectW(DevInstParent, NULL, NULL, 0, 0); // with messagebox (W2K, Vista) or balloon (XP)

		bSuccess = (res==CR_SUCCESS && VetoType==PNP_VetoTypeUnknown);
		if ( bSuccess )  { 
			break;
		}

		Sleep(500); // required to give the next tries a chance!
	}

	if ( bSuccess ) {
		printf("Success\n\n");
		return TRUE;
	}

	printf("failed\n");
	
	printf("Result=0x%2X\n", res);

	if ( VetoNameW[0] ) {
		printf("VetoName=%ws)\n\n", VetoNameW);
	}	
	return FALSE;
}
//-----------------------------------------------------------



#endif