根据文件句柄获得完整路径

使用NtQueryInformationFile函数获得不到完整路径

可以用NtQueryObject获取完整的NT路径：

#include <windows.h>
#include <iostream>
using namespace std;


typedef struct _OBJECT_NAME_INFORMATION {
    WORD Length;
    WORD MaximumLength;
    LPWSTR Buffer;
} OBJECT_NAME_INFORMATION, *POBJECT_NAME_INFORMATION;

typedef long(__stdcall*PNtQueryObject)(HANDLE ObjectHandle,ULONG ObjectInformationClass,PVOID ObjectInformation,ULONG ObjectInformationLength,PULONG ReturnLength);

int main(){
    PNtQueryObject NtQueryObject(reinterpret_cast<PNtQueryObject>(GetProcAddress(GetModuleHandleW(L"ntdll.dll"),"NtQueryObject")));
    OBJECT_NAME_INFORMATION name,*pname;ULONG len;
    HANDLE hFile=CreateFile(L"D:\\xiao\\xiaoma.txt",FILE_READ_DATA,1,0,OPEN_EXISTING,0,0);
    NtQueryObject(hFile,1,&name,sizeof name,&len);
    pname=reinterpret_cast<POBJECT_NAME_INFORMATION>(new char[len]);
    NtQueryObject(hFile,1,pname,len,&len);
    wcout<<pname->Buffer<<endl;
    return 0;
}

这样获得的路径是NT路径，如果要转化为DOS路径的话，可以用下面的函数。

///////////////////////////////////////////
//功  能：传入一个逻辑路径，转化成DOS路径
//参  数：DeviceName，逻辑路径
//        DosName,DOS路径
//返回值：执行成功，返回YES
///////////////////////////////////////////


NTSTATUS
    RtlVolumeDeviceToDosName_(
    IN  PUNICODE_STRING  DeviceName,
    OUT PUNICODE_STRING  DosName
    )

{

    UNICODE_STRING driveLetterName;
    WCHAR          driveLetterNameBuf[256];
    NTSTATUS status=STATUS_SUCCESS;
    WCHAR c;
    int Len,i,j;
    WCHAR DriLetter[3];
    UNICODE_STRING linkTarget;
    USHORT len;
    ANSI_STRING ANSI_PATH;
    CHAR T2[256];
    ANSI_PATH.Buffer=T2;
    ANSI_PATH.MaximumLength=256;

    for (c = L'A'; c <= L'Z'; c++)
    {
        RtlInitEmptyUnicodeString(&driveLetterName,driveLetterNameBuf,sizeof(driveLetterNameBuf));
        RtlAppendUnicodeToString(&driveLetterName, L"\\??\");
            DriLetter[0] = c;
        DriLetter[1] = L':';
        DriLetter[2] = 0;
        RtlAppendUnicodeToString(&driveLetterName,DriLetter);
        status = QuerySymbolicLink(&driveLetterName, &linkTarget);
        if (!NT_SUCCESS(status))
        {
            continue;
        }
        if (RtlPrefixUnicodeString(&linkTarget, DeviceName, TRUE))
        {
            Len=linkTarget.Length;
            ExFreePool(linkTarget.Buffer);
            break;
        }
        ExFreePool(linkTarget.Buffer);
    }
    if (c <= L'Z')
    {
        DosName->Length   = DeviceName->Length+4-Len;
        *(DosName->Buffer)  = c;
        *(DosName->Buffer+ 1) = ':';
        *(DosName->Buffer+ 2) = 0;
        j=2;
        for(i=Len/2;i<DeviceName->Length/2;i++,j++)
        {
            *(DosName->Buffer+j)=DeviceName->Buffer[i];
        }
        return STATUS_SUCCESS;
    }
    return status;
}