读取光驱上的指定扇区

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本例子是读取光驱上的指定扇区（16，17两扇区）内容，如要读取软盘，在一开始CreateFile时候打开："////.//A:"也可取得同样效果,但是如果是不可移动的drive如磁盘，则需要修改一些调用参数，代码中有显示）：
步骤：
1 使用CreateFile来打开光驱drive
2 使用ReadFile或者ReadFileEx来读取扇区
3 使用CloseHandle来关闭光驱drive

例子代码如下：
#include "stdafx.h"

#include <windows.h>
#include <winioctl.h>
int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
// TODO: Place code here.
HANDLE hCD, hFile;
DWORD dwNotUsed;

// 存放读取出来的扇区内容的文件
hFile = CreateFile ("sector.txt",
GENERIC_WRITE, 0, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL, NULL);

// For the purposes of this sample, drive F: is the CD-ROM
// drive.
hCD = CreateFile ("////.//F:", GENERIC_READ,
FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
NULL);

// If the CD-ROM drive was successfully opened, read sectors 16
// and 17 from it and write their contents out to a disk file.
if (hCD != INVALID_HANDLE_VALUE)
{
DISK_GEOMETRY dgCDROM;
PREVENT_MEDIA_REMOVAL pmrLockCDROM;

// Lock the compact disc in the CD-ROM drive to prevent accidental
// removal while reading from it.
pmrLockCDROM.PreventMediaRemoval = TRUE;
//DeviceIoControl (hCD, IOCTL_CDROM_MEDIA_REMOVAL,
DeviceIoControl (hCD, IOCTL_STORAGE_MEDIA_REMOVAL,
&pmrLockCDROM, sizeof(pmrLockCDROM), NULL,
0, &dwNotUsed, NULL);

// Get sector size of compact disc
//if (DeviceIoControl (hCD, IOCTL_CDROM_GET_DRIVE_GEOMETRY,
if (DeviceIoControl (hCD, IOCTL_DISK_GET_DRIVE_GEOMETRY,
NULL, 0, &dgCDROM, sizeof(dgCDROM),
&dwNotUsed, NULL))
{
LPBYTE lpSector;
DWORD dwSize = 2 * dgCDROM.BytesPerSector; // 2 sectors

// Allocate buffer to hold sectors from compact disc. Note that
// the buffer will be allocated on a sector boundary because the
// allocation granularity is larger than the size of a sector on a
// compact disk.
lpSector = (unsigned char *)VirtualAlloc (NULL, dwSize,
MEM_COMMIT|MEM_RESERVE,PAGE_READWRITE);

// Move to 16th sector for something interesting to read.
SetFilePointer (hCD, dgCDROM.BytesPerSector * 16,
NULL, FILE_BEGIN);

// Read sectors from the compact disc and write them to a file.
if (ReadFile (hCD, lpSector, dwSize, &dwNotUsed, NULL))
WriteFile (hFile, lpSector, dwSize, &dwNotUsed, NULL);

VirtualFree (lpSector, 0, MEM_RELEASE);
}

// Unlock the disc in the CD-ROM drive.
pmrLockCDROM.PreventMediaRemoval = FALSE;
DeviceIoControl (hCD, IOCTL_STORAGE_MEDIA_REMOVAL,
&pmrLockCDROM, sizeof(pmrLockCDROM), NULL,
0, &dwNotUsed, NULL);

CloseHandle (hCD);
CloseHandle (hFile);
}
return 0;
}