经典win32代码之从文件句柄获得文件名

#include <windows.h>
#include <stdio.h>
#include <tchar.h>
#include <string.h>
#include <psapi.h>

#define BUFSIZE 512

BOOL GetFileNameFromHandle(HANDLE hFile)
{
  BOOL bSuccess = FALSE;
  TCHAR pszFilename[MAX_PATH+1];

  // Get the file size.
  DWORD dwFileSizeHi = 0;
  DWORD dwFileSizeLo = GetFileSize(hFile, &dwFileSizeHi);

  // Create a file mapping object.
  HANDLE hFileMap = CreateFileMapping(hFile,
                          NULL,
                          PAGE_READONLY,
                          0,
                          dwFileSizeLo,
                          NULL);

  if (hFileMap)
  {
    // Create a file mapping to get the file name.
    void* pMem = MapViewOfFile(hFileMap, FILE_MAP_READ, 0, 0, 1);

    if (pMem)
    {
      if (GetMappedFileName (GetCurrentProcess(),
                             pMem,
                             pszFilename,
                             MAX_PATH))
      {

        // Translate path with device name to drive letters.
        TCHAR szTemp[BUFSIZE];
        szTemp[0] = '/0';

        if (GetLogicalDriveStrings(BUFSIZE-1, szTemp))
        {
          TCHAR szName[MAX_PATH];
          TCHAR szDrive[3] = TEXT(" :");
          BOOL bFound = FALSE;
          TCHAR* p = szTemp;

          do
          {
            // Copy the drive letter to the template string
            *szDrive = *p;

            // Look up each device name
            if (QueryDosDevice(szDrive, szName, BUFSIZE))
            {
              UINT uNameLen = _tcslen(szName);

              if (uNameLen < MAX_PATH)
              {
                bFound = _tcsnicmp(pszFilename, szName,
                    uNameLen) == 0;

                if (bFound)
                {
                  // Reconstruct pszFilename using szTemp
                  // Replace device path with DOS path
                  TCHAR szTempFile[MAX_PATH];
                  _stprintf(szTempFile,
                            TEXT("%s%s"),
                            szDrive,
                            pszFilename+uNameLen);
                  _tcsncpy(pszFilename, szTempFile, MAX_PATH);
                }
              }
            }

            // Go to the next NULL character.
            while (*p++);
          } while (!bFound && *p); // end of string
        }
      }
      bSuccess = TRUE;
      UnmapViewOfFile(pMem);
    }

    CloseHandle(hFileMap);
  }
  printf("File name is %s/n", pszFilename);
  return(bSuccess);
}