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PODrive Letter vs. DevicePath
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  1. PODrive Letter vs. DevicePath
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    copied!<p>I'm searching about this since last week, almost all links about DriveLetter x DevicePath/Volume/Device ID/whatever are purple for me.</p> <p>I'm developing an application that List some sotorage devices and also HDI/WPD devices using SetupApi functions with these guids GUID_DEVINTERFACE_USB_DEVICE "A5DCBF10-6530-11D2-901F-00C04FB951ED", GUID_DEVINTERFACE_VOLUME "53F5630D-B6BF-11D0-94F2-00A0C91EFB8B".</p> <p>So... I already able to map devices with drive letter. How? With SetupApi result, using DevicePath to get a DiskNumber and PartitionNumber with DeviceIOControl. And it's ok!!! Actually not all. Actually to CDROM drives I can't get it.</p> <p>Here's my code.</p> <pre><code>int bytesReturned = 0; IOCTL.DiskExtents de1 = new IOCTL.DiskExtents(); int numDiskExtents = 0; IntPtr ptrDe1 = Marshal.AllocHGlobal(Marshal.SizeOf(de1)); bool result = IOCTL.DeviceIoControl(FileHandle, IOCTL.IOControlCodes.IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS, IntPtr.Zero, 0, ptrDe1, Marshal.SizeOf(de1), bytesReturned, null); if ((!result)) { Marshal.FreeHGlobal(ptrDe1); //libera a memória alocada. throw new System.ComponentModel.Win32Exception(); //is thrown here } else { de1 = Marshal.PtrToStructure(ptrDe1, typeof(IOCTL.DiskExtents)); Marshal.FreeHGlobal(ptrDe1); return de1.first.DiskNumber; } </code></pre> <p><strong>For all CDROM drive I have, an IncorrectFunction is thrown.</strong></p> <p>For get the FileHandle I use both, Drive Letter (like "\.\D:") and Device Path. And both fail.</p> <p>I don't know if I am doing something wrong, 'cause this work for USB Mass Storage and hard disks.</p> <p>Thanks.</p>
 

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