盘符

Windows驱动从设备名获取dos盘符路径

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NTSTATUS querySymbolicLink(PUNICODE_STRING symbolicLinkName, PUNICODE_STRING linkTarget)
{
	OBJECT_ATTRIBUTES oa;
	NTSTATUS status;
	HANDLE handle;
 
	InitializeObjectAttributes(&oa, symbolicLinkName, OBJ_CASE_INSENSITIVE, 0, 0);
	status = ZwOpenSymbolicLinkObject(&handle, GENERIC_READ, &oa);
	if (!NT_SUCCESS(status))
		return status;
 
	linkTarget->MaximumLength = 200 * sizeof(WCHAR);
	linkTarget->Length = 0;
	linkTarget->Buffer = ExAllocatePool(PagedPool, linkTarget->MaximumLength);
	if (!linkTarget->Buffer)
	{
		ZwClose(handle);
		return STATUS_INSUFFICIENT_RESOURCES;
	}
	RtlZeroMemory(linkTarget->Buffer, linkTarget->MaximumLength);
 
	status = ZwQuerySymbolicLinkObject(handle, linkTarget, NULL);
	ZwClose(handle);
 
	if (!NT_SUCCESS(status))
	{
		ExFreePool(linkTarget->Buffer);
	}
	return status;
}
 
WCHAR *rtlVolumeDeviceToDosName(WCHAR *deviceName)
{
	NTSTATUS status;
	UNICODE_STRING driveLetterName;
	WCHAR driveLetterNameBuf[128];
	WCHAR c;
	WCHAR driLetter[3];
	UNICODE_STRING linkTarget;
 
	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 (_wcsnicmp(linkTarget.Buffer, deviceName, linkTarget.Length) == 0)
		{
			deviceName += linkTarget.Length - 2;
			deviceName[0] = c;
			deviceName[1] = L":";
			ExFreePool(linkTarget.Buffer);
			break;
		}
		ExFreePool(linkTarget.Buffer);
	}
	return deviceName;
}
 
WCHAR *getDosPath(WCHAR *path)
{
	WCHAR device[] = L"\\Device\\";
 
	if (strIsStartWith(path, device))
	{
		path = rtlVolumeDeviceToDosName(path);
	}
 
	return path;
}

获取HANDLE对应的文件路径

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#include <Windows.h>
#include <psapi.h>
#include <wchar.h>
 
WCHAR *getFilePathByHandle(HANDLE hFile, WCHAR* filePath, int filePathLen)
{
	DWORD dwFileSizeHi = 0;
	DWORD dwFileSizeLo = GetFileSize(hFile, &dwFileSizeHi);
	HANDLE hFileMap = CreateFileMapping(hFile, NULL, PAGE_READONLY, 0, dwFileSizeLo, NULL);
 
	filePath[0] = 0;
	if (NULL != hFileMap)
	{
		void* pMem = MapViewOfFile(hFileMap, FILE_MAP_READ, 0, 0, 1);
		if (NULL != pMem)
		{
			if (0 == GetMappedFileNameW(GetCurrentProcess(), pMem, filePath, filePathLen))
			{
				// GetLastError
			}
			UnmapViewOfFile(pMem);
		}
		CloseHandle(hFileMap);
	}
	return filePath;
}
 
wchar_t toLower(wchar_t ch)
{
	if ('A' <= ch && ch <= 'Z')
		ch = ch - 'A' + 'a';
	return ch;
}
 
int isNoCaseBeginWith(wchar_t* l, wchar_t* r)
{
	if (*l == 0 && *r == 0)
		return 1;
	if (*l == 0 || *r == 0)
		return 0;
	for (; 0 != *l && 0 != *r; l++, r++)
	{
		if (toLower(*l) != toLower(*r))
			return 0;
	}
	return 1;
}
 
WCHAR* getDosFilePath(WCHAR *dosPath, int len, WCHAR* kernelPath)
{
	wchar_t path[3] = L"C:";
	wchar_t szBuf[MAX_PATH] = { 0 };
	for (wchar_t ch = L'A'; ch <= L'Z'; ch++)
	{
		path[0] = ch;
		QueryDosDevice(path, szBuf, MAX_PATH);
		if (isNoCaseBeginWith(kernelPath, szBuf))
		{
			swprintf_s(dosPath, len, L"%s%s", path, kernelPath + wcslen(szBuf));
			return dosPath;
		}
	}
	dosPath[0] = 0;
	return dosPath;
}
 
int main()
{
	HANDLE hFile = CreateFileW(L"d:\\test.txt",
		GENERIC_READ,
		FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
		NULL,
		OPEN_EXISTING,
		0x00,
		NULL);
 
	if (INVALID_HANDLE_VALUE == hFile)
	{
		return 0;
	}
 
	WCHAR path[1024];
	getFilePathByHandle(hFile, path, 1024);
 
	WCHAR dosPath[1024];
	getDosFilePath(dosPath, 1024, path);
 
	CloseHandle(hFile);
 
	return 0;
}