File inherits from Stream: proper support for print and println of all supported data type

Author: pschatzmann

.gitignore

@@ -1 +1,2 @@
 *.swp
+.vscode

examples/Full/Full.ino

@@ -251,6 +251,8 @@ void setup()
     MyFile.println();
     MyFile.println("This should be line 6");
     MyFile.println(str);
+    MyFile.print("This should be line ");
+    MyFile.println(8);
     Serial.println("OK");
     Serial.print("Closing 'ARDUINO/SD/PRINT.txt' file");
     Serial.println("OK");
@@ -291,7 +293,26 @@ void setup()
   } else {
     Serial.println("KO --> Error to open 'ARDUINO/SD/WRITE.txt' file");
   }
+
+  /* Test readBytes(buf, len) method */
+  Serial.print("Opening 'ARDUINO/SD/WRITE.txt' file...");
+  MyFile = SD.open("ARDUINO/SD/WRITE.txt");
+  if (MyFile) {
+    Serial.println("OK");
+    Serial.print("  Reading 'ARDUINO/SD/WRITE.txt' file: ");
+    bytesread = MyFile.readBytes(rtext, MyFile.size());
+    Serial.print(bytesread);
+    Serial.println(" bytes read");
+    Serial.println((const char*)rtext);
+    Serial.print("Closing 'ARDUINO/SD/WRITE.txt' file...");
+    MyFile.close();
+    Serial.println("OK");
+  } else {
+    Serial.println("KO --> Error to open 'ARDUINO/SD/WRITE.txt' file");
+  }
   Serial.println("###### End of the SD tests ######");
+
+
 }
 
 void loop()

src/STM32SD.h

@@ -30,7 +30,7 @@ uint8_t const LS_SIZE = 2;
 /** ls() flag for recursive list of subdirectories */
 uint8_t const LS_R = 4;
 
-class File {
+class File : public Stream {
   public:
     File(FRESULT res = FR_OK);
     virtual size_t write(uint8_t);
@@ -78,6 +78,9 @@ class File {
     {
       return _res;
     }
+    
+    using Print::println;
+    using Print::print;
 
 };