C++ SdFile::rewind方法代码示例

idigi_callback_status_t iDigiFileSystem::app_process_file_opendir(idigi_file_path_request_t * const request_data,
                                                        idigi_file_open_response_t * const response_data)
{
    idigi_callback_status_t status = idigi_callback_continue;
    SdFile *dir = new SdFile;

    if (dir == NULL)
    {
    	response_data->error->error_status = idigi_file_out_of_memory;
    }

    *dir = DigiSD.open(request_data->path);

    if (!dir->isOpen() || !dir->isDir())
    {
    	response_data->error->error_status = idigi_file_path_not_found;
    	return status;
    }

    dir->rewind();

    response_data->handle = dir;
    APP_DEBUG("opendir for %s returned %p\n", request_data->path, (void *) dir);

    return status;
}

  /**
   * Get a long pretty path based on a DOS 8.3 path
   */
  void CardReader::printLongPath(char *path) {
    lsAction = LS_GetFilename;

    int i, pathLen = strlen(path);

    // SERIAL_ECHOPGM("Full Path: "); SERIAL_ECHOLN(path);

    // Zero out slashes to make segments
    for (i = 0; i < pathLen; i++) if (path[i] == '/') path[i] = '\0';

    SdFile diveDir = root; // start from the root for segment 1
    for (i = 0; i < pathLen;) {

      if (path[i] == '\0') i++; // move past a single nul

      char *segment = &path[i]; // The segment after most slashes

      // If a segment is empty (extra-slash) then exit
      if (!*segment) break;

      // Go to the next segment
      while (path[++i]) { }

      // SERIAL_ECHOPGM("Looking for segment: "); SERIAL_ECHOLN(segment);

      // Find the item, setting the long filename
      diveDir.rewind();
      lsDive("", diveDir, segment);

      // Print /LongNamePart to serial output
      SERIAL_PROTOCOLCHAR('/');
      SERIAL_PROTOCOL(longFilename[0] ? longFilename : "???");

      // If the filename was printed then that's it
      if (!filenameIsDir) break;

      // SERIAL_ECHOPGM("Opening dir: "); SERIAL_ECHOLN(segment);

      // Open the sub-item as the new dive parent
      SdFile dir;
      if (!dir.open(diveDir, segment, O_READ)) {
        SERIAL_EOL;
        SERIAL_ECHO_START;
        SERIAL_ECHOPGM(MSG_SD_CANT_OPEN_SUBDIR);
        SERIAL_ECHO(segment);
        break;
      }

      diveDir.close();
      diveDir = dir;

    } // while i<pathLen

    SERIAL_EOL;
  }

void loop() { 
  uint32_t t;
  double r;

  Serial.println("Type any character to start");
  while (!Serial.available()) SPARK_WLAN_Loop();
  while (Serial.available()) Serial.read();

  // open or create file - truncate existing file.
  if (!file.open(&root, "BENCH.DAT", O_CREAT | O_TRUNC | O_RDWR)) {
    error("open failed");
  }
  // fill buf with known data
  for (uint16_t i = 0; i < (BUF_SIZE-2); i++) {
    buf[i] = 'A' + (i % 26);
  }
  buf[BUF_SIZE-2] = '\r';
  buf[BUF_SIZE-1] = '\n';
  Serial.print("File size ");
  Serial.print(FILE_SIZE_MB);
  Serial.println(" MB");
  uint32_t n = FILE_SIZE/sizeof(buf);
  Serial.println("Starting write test.  Please wait up to a minute");
  // do write test
  t = millis();
  for (uint32_t i = 0; i < n; i++) {
    if (file.write(buf, sizeof(buf)) != sizeof(buf)) {
      error("write failed");
    }
  }
  t = millis() - t;
  file.sync();
  r = (double)file.fileSize()/t;
  Serial.print("Write ");
  Serial.print(r);
  Serial.println(" kB/sec");
  Serial.println();
  Serial.println("Starting read test.  Please wait up to a minute");
  // do read test
  file.rewind();
  t = millis();
  for (uint32_t i = 0; i < n; i++) {
    if (file.read(buf, sizeof(buf)) != sizeof(buf)) {
      error("read failed");
    }
  }
  t = millis() - t;
  r = (double)file.fileSize()/t;
  Serial.print("Read ");
  Serial.print(r);
  Serial.println(" kB/sec");
  Serial.println("Done");
  file.close();
}

void ListFiles(Client client, uint8_t flags) {
  // This code is just copied from SdFile.cpp in the SDFat library
  // and tweaked to print to the client output in html!
  dir_t p;

  root.rewind();
  while (root.readDir(p) > 0) {
    // done if past last used entry
    if (p.name[0] == DIR_NAME_FREE) break;

    // skip deleted entry and entries for . and  ..
    if (p.name[0] == DIR_NAME_DELETED || p.name[0] == '.') continue;

    // only list subdirectories and files
    if (!DIR_IS_FILE_OR_SUBDIR(&p)) continue;


    // print file name with possible blank fill
    //root.printDirName(*p, flags & (LS_DATE | LS_SIZE) ? 14 : 0);


    for (uint8_t i = 0; i < 11; i++) {
      if (p.name[i] == ' ') continue;
      if (i == 8) {
        client.print('.');
      }
      client.print(p.name[i]);
    }
    if (DIR_IS_SUBDIR(&p)) {
      client.print('/');
    }

    // print modify date/time if requested
    if (flags & LS_DATE) {
      root.printFatDate(p.lastWriteDate);
      client.print(' ');
      root.printFatTime(p.lastWriteTime);
    }
    // print size if requested
    if (!DIR_IS_SUBDIR(&p) && (flags & LS_SIZE)) {
      client.print(' ');
      client.print(p.fileSize);
    }
    client.println("<br>");
  }
}

void setup() {
  Serial.begin(BPS_115200);
  PgmPrintln("Type any character to start");
  while (!Serial.available());
  
 // PgmPrint("Free RAM: ");
 /// Serial.println(FreeRam());  
 
  // initialize the SD card at SPI_FULL_SPEED for best performance.
  // try SPI_HALF_SPEED if bus errors occur.
  if (!card.init(SPI_FULL_SPEED)) error("card.init failed");
  
  // initialize a FAT volume
  if (!volume.init(&card)) error("volume.init failed!");

  PgmPrint("Type is FAT");
  Serial.println(volume.fatType(), DEC);
  
  if (!root.openRoot(&volume)) error("openRoot failed");
  
  // open or create file - truncate existing file.
  if (!file.open(&root, "BENCH.DAT", O_CREAT | O_TRUNC | O_RDWR)) {
    error("open failed");
  }
  
  // fill buf with known data
  for (uint16_t i = 0; i < (BUF_SIZE-2); i++) {
    buf[i] = 'A' + (i % 26);
  }
  buf[BUF_SIZE-2] = '\r';
  buf[BUF_SIZE-1] = '\n';
  
  PgmPrint("File size ");
  Serial.print(FILE_SIZE_MB);
  PgmPrintln(" MB");
  PgmPrintln("Starting write test.  Please wait up to a minute");
  
  // do write test
  uint32_t n = FILE_SIZE/sizeof(buf);
  uint32_t t = millis();
  for (uint32_t i = 0; i < n; i++) {
    if (file.write(buf, sizeof(buf)) != sizeof(buf)) {
      error("write failed");
    }
  }
  t = millis() - t;
  file.sync();
  double r = (double)file.fileSize()/t;
  PgmPrint("Write ");
  Serial.print(r);
  PgmPrintln(" KB/sec");
  Serial.println();
  PgmPrintln("Starting read test.  Please wait up to a minute");
  
  // do read test
  file.rewind();
  t = millis();
  for (uint32_t i = 0; i < n; i++) {
    if (file.read(buf, sizeof(buf)) != sizeof(buf)) {
      error("read failed");
    }
  }
  t = millis() - t;
  r = (double)file.fileSize()/t;
  PgmPrint("Read ");
  Serial.print(r);
  PgmPrintln(" KB/sec");
  PgmPrintln("Done");
}