VC下怎么才能判断哪个分区是系统分区？ 如果在C、D分区都装了操作系统，怎么才能知道当前系统是从那个分区启动的？

[flaring]

如果能判断， 如何判断？
如果不能判断， 也请说明原因？

多谢高手指教

[DentistryDoctor]

GetWindowsDirectory

The GetWindowsDirectory function retrieves the path of the Windows directory. The Windows directory contains such files as applications, initialization files, and help files.

This function is provided primarily for compatibility. Applications should store code in the Program Files folder and persistent data in the Application Data folder in the user's profile. For more information, see ShGetFolderPath.


UINT GetWindowsDirectory(
LPTSTR lpBuffer,
UINT uSize
);

Parameters
lpBuffer
[out] Pointer to the buffer to receive the null-terminated string containing the path. This path does not end with a backslash unless the Windows directory is the root directory. For example, if the Windows directory is named Windows on drive C, the path of the Windows directory retrieved by this function is C:\Windows. If the system was installed in the root directory of drive C, the path retrieved is C:\.
uSize
[in] Maximum size of the buffer specified by the lpBuffer parameter, in TCHARs. This value should be set to MAX_PATH.

[DentistryDoctor]

可以认为Windows目录的驱就是活动的系统分区

[thinp]

GetWindowsDirectory

[surstar]

GetWindowsDirectory
返回后，再处理一下路径就可以了

[WuOu]

该说的楼上都说了，顶一下了.

[flaring]

谢谢楼上的回答。

想再问一句，如果我有两块硬盘，都可以对系统进行boot，我怎么才能知道当前正在运行的系统是从哪个硬盘boot进来的呢？

[idAnts]

你不是得到分区了，根据分区确定硬盘可以这样做：

HANDLE hDevice;
DWORD bytesReturned;
char rawDiskName[] = "\\\\.\\C:";//假定是c分区


hDevice = CreateFile(rawDiskName, GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, NULL);

if (hDevice == INVALID_HANDLE_VALUE) return FALSE;

STORAGE_DEVICE_NUMBER deviceInfo;
BOOL retcode=DeviceIoControl(hDevice,
IOCTL_STORAGE_GET_DEVICE_NUMBER,
NULL,
0,
&deviceInfo,
sizeof(deviceInfo),
&bytesReturned,
NULL);

if(retcode==FALSE)
{
CloseHandle(hDevice);
return FALSE;
}

*diskNumberPtr = deviceInfo.DeviceNumber;

[qinghai0011]

GetWindowsDirectory只是得到本地硬盘的分区信息，那如果我在电脑上外接一块硬盘，如何判断某个分区是否是系统分区啊