创build一个虚拟分区

我正在尝试使用C ++在USB驱动器上创build一个隐藏的虚拟分区。

我可以在Windows中使用虚拟磁盘API来做到这一点吗？

是的，虚拟磁盘API支持创建和装载卷而不分配驱动器号的能力。这是通过将ATTACH_VIRTUAL_DISK_FLAG_NO_DRIVE_LETTER传递给AttachVirtualDisk

 // This call requires elevated privileges to succeed. ::AttachVirtualDisk( handle, // Handle returned by CreateVirtualDisk or OpenVirtualDisk NULL, ATTACH_VIRTUAL_DISK_FLAG_NO_DRIVE_LETTER, 0, // no provider-specific flags 0, // no parameters NULL);

困难的部分是访问没有驱动器号的卷。虚拟磁盘API不提供直接获取虚拟驱动器上卷的列表的方法。这很重要，因为您必须通过UNC路径访问卷，因为驱动器号不可用。要获取UNC路径，您需要枚举所有已装入的卷以查找位于虚拟硬盘驱动器上的卷。这是通过打开每个安装的卷并使用DeviceIoControl检索与文件句柄关联的设备信息来完成的。

包含的示例执行以下步骤来创建，装载和访问我们的虚拟驱动器上的隐藏卷。

分别使用CreateVirtualDisk或OpenVirtalDisk创建或打开虚拟磁盘文件。
使用AttachVirtualDisk附加虚拟磁盘。 您必须具有提升权限才能成功执行此步骤 。
初始化设备。
在设备上创建一个卷。
枚举安装的卷以查找虚拟磁盘上的卷。

[ 步骤3和4需要从磁盘管理控制面板手动完成。 这当然可以通过编程来完成，但是会为示例添加更多的代码。 ]

 #include <iostream> #include <fstream> #include <string> #include <virtdisk.h> #pragma comment(lib, "virtdisk.lib") // Fix unresolved link error static const GUID VIRTUAL_STORAGE_TYPE_VENDOR_MICROSOFT = { 0xEC984AEC, 0xA0F9, 0x47e9, 0x90, 0x1F, 0x71, 0x41, 0x5A, 0x66, 0x34, 0x5B }; #define ARRAY_SIZE(a) \ ((sizeof(a) / sizeof(*(a))) / \ static_cast<size_t>(!(sizeof(a) % sizeof(*(a))))) DWORD CreateDisk(PCWSTR virtualDiskFilePath, HANDLE *handle) { VIRTUAL_STORAGE_TYPE storageType = { VIRTUAL_STORAGE_TYPE_DEVICE_VHD, VIRTUAL_STORAGE_TYPE_VENDOR_MICROSOFT }; CREATE_VIRTUAL_DISK_PARAMETERS parameters = {}; parameters.Version = CREATE_VIRTUAL_DISK_VERSION_1; parameters.Version1.MaximumSize = 1024 * 1024 * 1024; parameters.Version1.BlockSizeInBytes = CREATE_VIRTUAL_DISK_PARAMETERS_DEFAULT_BLOCK_SIZE; parameters.Version1.SectorSizeInBytes = CREATE_VIRTUAL_DISK_PARAMETERS_DEFAULT_SECTOR_SIZE; parameters.Version1.SourcePath = NULL; int result = ::CreateVirtualDisk( &storageType, virtualDiskFilePath, VIRTUAL_DISK_ACCESS_ALL, NULL, CREATE_VIRTUAL_DISK_FLAG_NONE, 0, &parameters, NULL, handle); return result; } DWORD OpenDisk(PCWSTR virtualDiskFilePath, HANDLE *handle) { VIRTUAL_STORAGE_TYPE storageType = { VIRTUAL_STORAGE_TYPE_DEVICE_VHD, VIRTUAL_STORAGE_TYPE_VENDOR_MICROSOFT }; OPEN_VIRTUAL_DISK_PARAMETERS parameters = { OPEN_VIRTUAL_DISK_VERSION_1 }; parameters.Version1.RWDepth = 1024; return ::OpenVirtualDisk( &storageType, virtualDiskFilePath, VIRTUAL_DISK_ACCESS_ALL, OPEN_VIRTUAL_DISK_FLAG_NONE, &parameters, handle); } int main(int argc, char *argv[]) { LPTSTR virtualDiskFilePath = _T("c:\\source\\drive.vhd"); HANDLE handle; DWORD result; ULONG bytesUsed; bool vhdCreated = false; // Create or open a virtual disk file result = CreateDisk(virtualDiskFilePath, &handle); if(result == ERROR_FILE_EXISTS) { result = OpenDisk(virtualDiskFilePath, &handle); if(result != ERROR_SUCCESS) { std::wcout << "Unable to open virtual disk" << std::endl; return 1; } } else if(result != ERROR_SUCCESS) { std::wcout << "Unable to create virtual disk" << std::endl; return 1; } else { vhdCreated = true; } // Now that the virtual disk is open we need to mount it. // // FROM MSDN: // To attach and detach a virtual disk, you must also have the // SE_MANAGE_VOLUME_NAME privilege present in your token. This privilege // is stripped from an administrator's token when User Account Control is // in use, so you may need to elevate your application to gain access to // the unrestricted token that includes this privilege. result = ::AttachVirtualDisk( handle, NULL, ATTACH_VIRTUAL_DISK_FLAG_NO_DRIVE_LETTER, 0, // no provider-specific flags 0, // no parameters NULL); if(result != ERROR_SUCCESS) { std::wcout << "Unable to attach virtual disk" << std::endl; return 1; } if(result == ERROR_SUCCESS && vhdCreated == true) { std::wcout << "Virtual disk image created. Go into the Computer Management admin panel" << std::endl << "and add a volume and format it.\n" << std::endl; system("pause"); } // Now we need to grab the device name \\.\PhysicalDrive# TCHAR physicalDriveName[MAX_PATH]; DWORD physicalDriveNameSize = ARRAY_SIZE(physicalDriveName); result = ::GetVirtualDiskPhysicalPath(handle, &physicalDriveNameSize, physicalDriveName); if(result != ERROR_SUCCESS) { std::wcout << "Unable to retrieve virtual disk path" << std::endl; return 1; } const std::wstring deviceName = physicalDriveName; // HACK!!! Wait for windows to complete the mount. Sleep(2500); // In order to get the UNC path of the volumes located on the virtual disk we // need to enumerate all mounted volumes and check which device they are located // on. std::wstring volumeName; TCHAR volumeNameBuffer[MAX_PATH]; HANDLE hVol = ::FindFirstVolume(volumeNameBuffer, ARRAY_SIZE(volumeNameBuffer)); if(hVol == INVALID_HANDLE_VALUE) { std::wcout << "Unable to find first volume" << std::endl; return 1; } do { // Get rid of trailing backslash so we can open the volume size_t len = wcslen(volumeNameBuffer); if (volumeNameBuffer[len-1] == '\\') { volumeNameBuffer[len-1] = 0; } HANDLE volumeHandle = ::CreateFile( volumeNameBuffer, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_BACKUP_SEMANTICS, NULL); if(volumeHandle == INVALID_HANDLE_VALUE) { std::wcout << "Unable to open volume " << volumeNameBuffer << std::endl; } else { // We can grab the id of the device and use it to create a // proper device name. STORAGE_DEVICE_NUMBER deviceInfo = {0}; if (::DeviceIoControl( volumeHandle, IOCTL_STORAGE_GET_DEVICE_NUMBER, NULL, 0, &deviceInfo, sizeof(deviceInfo), &bytesUsed, NULL)) { std::wstring tmpName( std::wstring(L"\\\\.\\PhysicalDrive") + std::to_wstring((long long)deviceInfo.DeviceNumber)); if(_wcsicmp(tmpName.c_str(), deviceName.c_str()) == 0) { volumeName = std::wstring(volumeNameBuffer) + L"\\\\"; CloseHandle(volumeHandle); break; } } CloseHandle(volumeHandle); } } while(::FindNextVolume(hVol, volumeNameBuffer, ARRAY_SIZE(volumeNameBuffer)) != FALSE); ::FindVolumeClose(hVol); if(volumeName.size() == 0) { std::wcout << "Unable to locate a volume on this device" << std::endl; return 1; } std::wcout << "Device: " << physicalDriveName << std::endl; std::wcout << "Volume: " << volumeName << std::endl; std::wcout << "\n\nSuccess! Now create the file!" << std::endl; // Now let's create a file for fits and giggles std::ofstream output; output.open(volumeName + L"hello.txt"); if(output.fail()) { std::wcout << "Unable to open output file." << std::endl; return 1; } output.close(); // Volume will be unmounted when the application closes system("pause"); return 0; }