NXT 2.0 Hanging in this function...

[monxc]

Hello,

can somebody shed some light on this for me, please? I've done as much banging my head against it as I can - I imagine it's something quite straight forward, embarrassingly...

Code: Select all

string optMenu(string strPrompt, string strOptions)
{
  int intIndex = 0;
  int intOptions = 0;
  int intOptStart = 0;
  int intOptEnd = 0;
  int intLineT = 40;
  int intLineS = 40;
  int intSelected = 0;
  int strArrOptions[5];      //never more than five options, so set it here rather than try to ArrayInit it etc...

  //create the options array from the string passed in
/*  while(intIndex < StrLen(strOptions)){
    if(SubStr(strOptions,intIndex,1) == ","){
      intOptEnd = intIndex - 1;                                                              //define the end of this option
      strArrOptions[intOptions] = SubStr(strOptions,intOptStart,intOptEnd - intOptStart);
      intOptStart = intIndex + 1;                                                            //define the start of the next option (if there is one)
      intOptions++;                                                                          //increment the number of options found
    }
    intIndex++;                                                                              //increment the string pointer
  }

  //add the last option (will be missed by the above loop, as no comma is encountered
  strArrOptions[intOptions] = SubStr(strOptions,intOptStart,StrLen(strOptions) - intOptStart;
  intOptions++;
 */
 
  strArrOptions[0] = "Turn";
  strArrOptions[1] = "Move";
  strArrOptions[2] = "Set WPT";
  strArrOptions[3] = "Options...";
  strArrOptions[4] = "";

  intOptions = 4;
 
  while(!ButtonPressed(BTN4,FALSE)){
    TextOut(0,56,strPrompt/*,DRAW_OPT_CLEAR_WHOLE_SCREEN*/);
    for(intIndex = 0; intIndex < intOptions; intIndex++){
      TextOut(8,intLineT,">" + strArrOptions[intIndex]);
      intLineT -= 8;
    }
    intLineT = 40;
  }
  return strArrOptions[intSelected];
}

Sorry for the big, messy function, but somewhere in here, although it complies fine, it causes my NXT 2.0 to hang (batteries out/batteries in again to fix it!)

What I'm trying to do is this - I want a general purpose function that will put a menu of text options on the NXT LCD screen. Because I can't seem to pass an array to a function (I keep getting the error "Math Factor expected"), I'm instead passing a string and then parsing it to build an array inside the function itself. As you can see, however, all the string parsing code is commented out, because it doesn't work... I can't see what's wrong with it, but the array it creates is beyond 5 elements in size (how?!) and always contains only the last text option in every element... Anyway, whilst trying to debug this conundrum, I decided to hard-code the array (strArrOptions[]) with the options I'd be passing in as strOptions. The result was just strPrompt on the screen, as I'd forgotten to set intOptions to be greater than 0; once I did this, however, although the code happily compiles and uploads to the NXT, when I run it, the NXT freezes.

I imagine I've put it into some sort of non-ending loop, but I can't see why

Any thoughts on this would be gratefully received,

Thanks,

monxc_

[monxc]

...er...well, I said it'd be something simple - I'd declared the array (strArrOptions[]) that was to hold the string options as an integer...oops...I'd even named it with str at the front!!!

[puffs out cheeks] I think my response to that is spherical and in the plural...clearly time to quit coding for the day

monxc_