hopefully fix file writer append issue

lichtschranke/speedshow/speedshow.pde

@@ -25,7 +25,7 @@ float speedfloat=0;
 
 float triggerspeedmin=15; //current triggerspeed
 
-Date d=new Date();
+
 
 PrintWriter pw;
 
@@ -62,7 +62,7 @@ void setup() {
   
   sendSpeedTrapValue(int(triggerspeedmin));
   
-  pw=createWriter("speeds.txt");
+  //pw=createWriter("speeds.txt");
   
   background(0);
   
@@ -89,10 +89,12 @@ void draw() {
       speeds_index++;
       speeds_index%=speeds_show;
       
+      Date d=new Date();
       
       println(d.getTime()+";"+speedfloat);
-      pw.println(d.getTime()+";"+speedfloat);
-      pw.flush();
+      //pw.println(d.getTime()+";"+speedfloat);
+      //pw.flush();
+      appendTextToFile("speeds.txt",d.getTime()+";"+speedfloat);
       
       unitdisplay=int(random(0,unitdisplay_count));
       println("unitdisplay: "+unitdisplay);
@@ -190,3 +192,27 @@ void sendSpeedTrapValue(int v){
   myPort.write(""+v+"\n");
   println("Send trigger speed:"+v);
 }
+
+
+void appendTextToFile(String filename, String text){
+  File f = new File(dataPath(filename));
+  if(!f.exists()){
+    createFile(f);
+  }
+  try {
+    PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(f, true)));
+    out.println(text);
+    out.close();
+  }catch (IOException e){
+      e.printStackTrace();
+  }
+}
+void createFile(File f){
+  File parentDir = f.getParentFile();
+  try{
+    parentDir.mkdirs(); 
+    f.createNewFile();
+  }catch(Exception e){
+    e.printStackTrace();
+  }
+}