LISTVIEW_KIND exec lists

[Inner200k]

Forgive me but I've clear forgotten how to use this gadget; SASC 6.58, would be good if there was a repository some place with example code on how to do some of these things just as a branching thought.

  
  struct NewGadget ng;
  struct List *diskList;
  

  if (diskList = AllocMem(sizeof(struct List), MEMF_CLEAR)) {
    NewList(diskList);

  } else {
    printf("Cannot allocate memory for list.\n");
  }

  gad = CreateContext(glistptr);

  ng.ng_LeftEdge   = 4;
  ng.ng_TopEdge    = 4;
  ng.ng_Width      = 200;
  ng.ng_Height     = 200;
  //ng.ng_GadgetText = "_+";
  ng.ng_GadgetID   = LV_DISKS;
  ng.ng_Flags      = 0;
  gad = CreateGadget(LISTVIEW_KIND, gad, &ng,
                     GTLV_ShowSelected, NULL,
                     GTLV_Selected, 0,
                     GTLV_MakeVisible, 0,
                     GTLV_Labels, diskList, 
                     TAG_END);

I'm forgetting something, I get suspend / reboot #80000005 (integer division by zero error.)

[a/b]

GTLV_Labels tag is an array of pointers (struct List*[]) and not a single struct List*. Something like:

struct List lab0 = { ... };
...
struct List lab3 = { ... };
struct List* disklist[4] = { &lab0, ..., &lab3 };

[thomas]

Originally Posted by Inner200k

I'm forgetting something, I get suspend / reboot #80000005 (integer division by zero error.)

You should ignore a/b's post, it's complete nonsense.

Your code looks ok. Which version of gadtools.library are you using?

The list is completely empty, but you still ask it to select the first entry and make it visible. Maybe you should add some nodes to the list. Or omit these tags until the entry you ask for is actually in the list.

There is a rather old example: http://thomas-rapp.homepage.t-online.de/examples/lv.c
I don't know if it covers your issue here.

[a/b]

I meant array of nodes, of course. That should make a little more sense but it's still wrong (struct List* is the correct tag argument).
The problem was my "source of info" (a pretty big and messy one, shouldn't be hard to guess :P) is not using a list header (c equivalent: struct List, with extra type and pad) but a minimal list header (struct MinList, containing only 3 pointers), which is easily mixed up with a pointer array when you have DC.L's. Combined with settings the labels for other gadgets (radio buttons, multi select buttons) that do have a GTXX_Labels pointer array argument...
In any case, thanks for correction.

[Inner200k]

Originally Posted by thomas

You should ignore a/b's post, it's complete nonsense.

Your code looks ok. Which version of gadtools.library are you using?

The list is completely empty, but you still ask it to select the first entry and make it visible. Maybe you should add some nodes to the list. Or omit these tags until the entry you ask for is actually in the list.

There is a rather old example: http://thomas-rapp.homepage.t-online.de/examples/lv.c
I don't know if it covers your issue here.

v37 it's a framework from an example I found for doing sliders / string & buttons and such, since I knew what was trying to do rather than reinvent the wheel, I used what was there modifying it and removing parts I didn't require, hmm considering I've got gadtools.library version 40.5 maybe I should change that as I doubt many well be running 37 these days if any, however I suppose it doesn't really matter for now?

Yes the list is 'supposed' to be empty for now, program start presents an empty list to be filled by the user later, a collection of disk image(s) names to be exact.

-- source code compiles at least had to add a few includes but it runs, now to to discover why it runs.