Windows下获取盘符信息

在Windows 下，各盘符其实是系统中一个文件，我们了可以通过CreateFile来打开，然后再通过DeviceIoControl函数发送不同的控制码获取相关的信息。

这里的信息包括盘符大小，StartingOffset，DiskNumber，ExtentLength等。

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

#define IOCTL_VOLUME_BASE   ((DWORD) 'V')
#define IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS    CTL_CODE(IOCTL_VOLUME_BASE, 0, METHOD_BUFFERED, FILE_ANY_ACCESS)

void Show(char* pName)
{
    printf("%s\n",pName);
//char* pName = "\\\\.\\D:";
        HANDLE hDevice = CreateFile(pName, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL);
        if (hDevice == INVALID_HANDLE_VALUE)
        {
            return ;
        }

typedef struct _DISK_EXTENT {
    ULONG DiskNumber;
    LARGE_INTEGER StartingOffset;
    LARGE_INTEGER ExtentLength;
} DISK_EXTENT, *PDISK_EXTENT;
typedef struct _VOLUME_DISK_EXTENTS {
    ULONG NumberOfDiskExtents;
    DISK_EXTENT Extents[1];
} VOLUME_DISK_EXTENTS, *PVOLUME_DISK_EXTENTS;


VOLUME_DISK_EXTENTS vde;

    ULONG rtn;
    BOOL ok=    DeviceIoControl(hDevice,   
            IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS, 
            NULL,
            0,
            &vde,
            sizeof(vde),
            &rtn,
            NULL); 
    if(!ok)
    {
        DWORD e =GetLastError();
        e =e;
    }

    PDISK_EXTENT pdisk = vde.Extents;
    printf("DiskID:%d\n",pdisk->DiskNumber);
    printf("NumberOfDiskExtents:%d\n",vde.NumberOfDiskExtents);
    printf("start:%I64d\n",pdisk->StartingOffset.QuadPart/512);
    printf("ExtentLength:%I64d\n",pdisk->ExtentLength.QuadPart/512);


    printf("\n");
        CloseHandle(hDevice);
}
void main()
{
    DWORD dw=GetLogicalDriveStrings(0,NULL);
    LPTSTR lpDriveStrings=(LPTSTR) HeapAlloc( GetProcessHeap(),0,dw*sizeof(TCHAR));
    GetLogicalDriveStrings(dw,lpDriveStrings);
    for(;strlen(lpDriveStrings);)
    {
        printf("%s\n",lpDriveStrings);
        lpDriveStrings+=strlen(lpDriveStrings);
        lpDriveStrings++;
    }

    Show("\\\\.\\C:");
    Show("\\\\.\\D:");
    Show("\\\\.\\E:");
    Show("\\\\.\\F:");
    Show("\\\\.\\G:");
    Show("\\\\.\\H:");
    Show("\\\\.\\I:");
    Show("\\\\.\\M:");

}