将文件写入Win7上的物理驱动器 [英] WriteFile to physicaldrive on Win7

问题描述

我的应用程序需要直接写入物理驱动器，这是一个USB可移动存储设备.在安装Win7之前，它可以在xp上正常运行.在这种情况下，WriteFile win32 api返回拒绝访问错误(5).

在浏览此板时，我想到了如何进行写入的工作:基本上，必须先删除映射到该卷的驱动器，然后才能开始写入.

(1)调用QueryDosDevice以获取设备名称.
(2)使用DDD_RAW_TARGET_PATH调用DefineDosDevice | DDD_REMOVE_DEFINITION | DDD_EXACT_MATCH_ON_REMOVE

然后删除该卷，并且WriteFile()返回成功.到目前为止一切都很好.

现在的问题是:如何还原驱动器映射?

我尝试将DefineDosDevice与DDD_RAW_TARGET_PATH一起使用，这是可行的，但是即使移除USB，它也可以保留驱动器号.因此，如果我再次运行该应用程序，它将寻找下一个可用的驱动器号，直到最后机器必须重新启动.

在挂载可移动存储设备方面有什么建议吗?在此先感谢.

My application requires writing directly to physical drive which is a usb removable storage device. It works ok on xp until Win7 is installed. In this case the WriteFile win32 api returns deny access error (5).

While looking through this board I got the idea how to make the write work: basically the drive mapped to the volume must be removed before writing can begin.

(1) call QueryDosDevice to get device name.
(2) call DefineDosDevice with DDD_RAW_TARGET_PATH | DDD_REMOVE_DEFINITION | DDD_EXACT_MATCH_ON_REMOVE

The volume is then gets removed and WriteFile() returns success. So far so good.

The problem now is: How can I restore the drive mapping?

I tried using DefineDosDevice with DDD_RAW_TARGET_PATH which is kind works but it persist the drive letter even the USB is removed. So if I run the application again it will look for next available drive letter until finally the machine has to reboot.

Any suggestion on mount back a removable storage device? Thanks in advance.

推荐答案

找到了解决方法:

撤消调用DefineDosDevice().

在WriteDisk之前，

致电DeviceIoControl FSCTL_DISMOUNT_VOLUME.

写入后，调用IOCTL_STORAGE_LOAD_MEDIA进行还原.

Found the solution:

Undo calling DefineDosDevice().

Before WriteDisk,

Call DeviceIoControl FSCTL_DISMOUNT_VOLUME.

After writing, call IOCTL_STORAGE_LOAD_MEDIA to restore.

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