[SD]
描述
Directories (or folders) are special kinds of files, this function reports if the current file is a directory or not.
語法
file.isDirectory()
參數
file: an instance of the File class (returned by SD.open())
回傳
boolean
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
// Serial.println("**nomorefiles**");
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
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