从文件句柄获得全路径

#include <windows.h>

#include <ntsecapi.h>

 

#pragma comment (lib,"ntdll.lib")       // Copy From DDK

 

NTSYSAPI

NTSTATUS

NTAPI

ZwQueryObject(

    IN HANDLE ObjectHandle,

    IN ULONG ObjectInformationClass,

    OUT PVOID ObjectInformation,

    IN ULONG ObjectInformationLength,

    OUT PULONG ReturnLength OPTIONAL

    );

 

BOOL GetPathByHandle(HANDLE hFile, LPWSTR lpBuf, DWORD nBuf)

{

    ULONG m, n;

    WCHAR lpPath[MAX_PATH+4];

    WCHAR lpDrive[MAX_PATH];

    WCHAR lpDevName[MAX_PATH];

    if (ZwQueryObject(hFile, 1, lpPath, MAX_PATH+4, &m) >= 0 &&

        (m = GetLogicalDriveStringsW(MAX_PATH, lpDrive)) && m < MAX_PATH)

    {

        WCHAR *p = lpDrive;

        while (m = wcslen(p))

        {

            p[m-1] = L'\0';

            n = QueryDosDeviceW(p, lpDevName, MAX_PATH);

            if (n && n < MAX_PATH)

            {

                n = wcslen(lpDevName);

                if (!wcsnicmp(lpPath+4, lpDevName, n))

                {

                    wcsncpy(lpBuf, p, nBuf);

                    if (nBuf > 2) wcsncpy(lpBuf+2, lpPath+4+n, nBuf-2);

                    return TRUE;

                }

            }

            p += m + 1;

        }

    }

    return FALSE;

}

 

void main()

{

    WCHAR buf[MAX_PATH];

    HANDLE hFile = cr&#101;ateFile("C:\\boot.ini", 0, 0, 0, OPEN_EXISTING, 0, 0);

    if (hFile != INVALID_HANDLE_VALUE)

    {

        GetPathByHandle(hFile, buf, MAX_PATH);

        printf("%ws\n", buf);

        CloseHandle(hFile);

    }

    else

    {

        printf("cr&#101;ateFile Failed: %d\n", GetLastError());

    }

}