file.rewindDirectory()

[SD]

描述

rewindDirectory() will bring you back to the first file in the directory, used in conjunction with openNextFile().

語法

file.rewindDirectory()

參數

file: an instance of the File class (returned by SD.open())

回傳

None

範例

#include <SD.h>
 
File root;
 
void setup()
{
  Serial.begin(9600);
 
  SD.begin();
 
  root = SD.open("/");
 
  printDirectory(root, 0);
 
  Serial.println("done!");
}
 
void loop()
{
  // nothing happens after setup finishes.
}
 
void printDirectory(File dir, int numTabs) {
   while(true) {
 
     File entry =  dir.openNextFile();
     if (! entry) {
       // no more files
       // return to the first file in the directory
       dir.rewindDirectory();
       break;
     }
     for (uint8_t i=0; i<numTabs; i++) {
       Serial.print('\t');
     }
     Serial.print(entry.name());
     if (entry.isDirectory()) {
       Serial.println("/");
       printDirectory(entry, numTabs+1);
     } else {
       // files have sizes, directories do not
       Serial.print("\t\t");
       Serial.println(entry.size(), DEC);
     }
     entry.close();
   }
}

也可以看看


函式庫參考主頁面

86Duino 參考的文本是根據 Creative Commons Attribution-ShareAlike 3.0 License,部分文本是從 the Arduino reference 修改的。 參考中的代碼示例已發佈到公共領域。

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