3) Is there a way to obtain a numeric identifier for the current tab you are in when you have multiple tabs such that the tab Id is 0 to n?

uint32 current_tab;
IIntuition->GetAttr(CLICKTAB_Current, clicktab_object, &current_tab);

4) Unrelated to reaction - I want to compile and build this RIJNDAEL source code and make it link to my code: http://www.efgh.com/software/rijndael.htm
I broke the source file into its component pieces - encrypt.c, decrypt.c, rijndael.c and rijndael.h - but when I use GCC to compile any of the .c code files, I get errors because each file references the other .c file for different unctions. How do I make .o files to link together to my program using GCC?

Use -c option:
gcc -c -o file1.o file1.c
gcc -c -o file2.o file2.c
gcc -c -o file3.o file3.c
gcc -o final_exe file1.o file2.o file3.o

Preferably you should use a Makefile instead of typing in commands manually into the shell so that only .c files that have actually changed are recompiled and also so that you don't need to remember all the options you need to use to compile your program.

@AmigaOneFan

I downloaded codebench and am quite impressed! It should take care of my having to include multiple source files and creating makefiles for me. Great program!
Oh, sometimes when I exit codebench I get an program ISI error.
Also, what do I need to do in codebench to get the debugger to work?

Someone who's used CodeBench will have to answer this question for you. If you post in the CodeBench support forum on www.amigans.net you will probably have a higher chance to get a reply from the author.

Here's another listbrowser question - how do I make listbrowser data editable? I have tried adding LISTBROWSER_ShowSelected and LISTBROWSER_Editable to my creation of the listbrowsers when I do a newOBJ on them...but it doesn;t seem to make any difference. When I click inside any of the data items, I am not able to edit them....the row highlights showing it is selected, but it does not allow me to edit it.
Is there some sort of LBCIA control I need to add?

I had to check AminetReadme source code to refresh my memory on this topic. In addition to setting LISTBROWSER_Editable to TRUE when creating the listbrowser you also need to set for every node that you create, for every column that you want to be editable the LBNCA_Editable tag to TRUE and LBNCA_MaxChars tag to the max amount of characters that you want the user to be able to enter. Also when you want to set or change a text in one of your editable column(s) you need to use LBNCA_CopyText (set to TRUE) so that the text you provide with LBNCA_Text is copied into the node's internal buffer.

F.e. to create a listbrowser node with three editable columns (30 characters each):

struct Node *node;
node = IListBrowser->AllocListBrowserNode(3,
    LBNA_Column,    0,
    LBNCA_Text,     "column 1 text",
    LBNCA_CopyText, TRUE,
    LBNCA_Editable, TRUE,
    LBNCA_MaxChars, 30,
    LBNA_Column,    1,
    LBNCA_Text,     "column 2 text",
    LBNCA_CopyText, TRUE,
    LBNCA_Editable, TRUE,
    LBNCA_MaxChars, 30,
    LBNA_Column,    2,
    LBNCA_Text,     "column 3 text",
    LBNCA_CopyText, TRUE,
    LBNCA_Editable, TRUE,
    LBNCA_MaxChars, 30,
    TAG_END);

@AmigaOneFan

No, I was referring to AminetReadme program for creating/editing Aminet readme files.

How do I determine which row of the current tab's listbrowser is selected?

Object *listbrowser;
struct Node *node = NULL;
IIntuition->GetAttr(LISTBROWSER_SelectedNode, listbrowser, (Tag *)&node);
if (node) {
    /* got selected node */
} else {
    /* no node selected */
}

@trixie

As LISTBROWSER_SelectedNode contains a pointer to struct Node, I'd say the default value would be NULL, not -1. Just guessing though.

I think he has the return values mixed up because -1 is the return value of LISTBROWSER_Selected when no node is selected, for LISTBROWSER_SelectedNode the equivalent value is NULL.

I'm not sure how your (TAG *) typecast might influence the result of the call, I've never seen it used before. I always retrieve the selected node like this:

Using Tag type may in some cases be more portable than using uint32 because uint32 will fail on a 64-bit system (in this case it doesn't really matter because the cast is there just so the compiler doesn't throw a warning). Even better would of course be if AmigaOS had a type similar to IPTR on AROS (IPTR on AROS is an unsigned integer type that is guaranteed to always be large enough to contain a pointer).

What do you mean by "I am not seeing the actual selected node"? Doesn't the node (row) become highlighted when you click on it?

Maybe he has forgot to set LISTBROWSER_ShowSelected to TRUE?

@AmigaOneFan

If your code example is still valid you're creating eight listbrowsers in line 252, 274, 294, 314 and than again at 421, 434, 447, 460 but only using four variables to remember the objects OBJ(OBJ_LISTBROWSER[1234]).

My guess would be the first four are the one which are beeing displayed but you're testing the wrong one because you have overwritten the corresponding variables.

You are adding two parent level layouts to your window (line 375 and 412) and I think that you shouldn't do that.

@AmigaOneFan

You should set LISTBROWSER_Labels to -1 not NULL if you're just removing the list so that you can add some modifications to it, also you want to add the list back after doing your modifications using IIntuition->SetGadgetAttrs().

void AddNodeToLB (Object *winobj, Object *lb, struct Node *node) {
    struct Window *window = NULL;
    struct List *list = NULL;
 
    /* get intuition window and list pointers (window pointer can be NULL) */
    IIntuition->GetAttr(WINDOW_Window, winobj, (Tag *)&window);
    IIntuition->GetAttr(LISTBROWSER_Labels, lb, (Tag *)&list);
 
    if (list) {
        /* remove list temporarily */
        IIntuition->SetAttrs(lb,
            LISTBROWSER_Labels, ~0,
            TAG_END);
 
        /* add our node */
        IExec->AddTail(list, node);
 
        /* add it back and refresh */
        IIntuition->SetGadgetAttrs((struct Gadget *)lb, window, NULL,
            LISTBROWSER_Labels, list,
            TAG_END);
    }
}

The listbrowser autodoc says quite explicitly that the "detach value" is ~0 or NULL, not -1.

-1 is the same value as ~0 (in 2's complement which practically all sane systems use). I find it strange that you do not know this...

As you may or may not have noticed I've used ~0 in the example code above but using either should be ok as they produce the same value.

He is using tabs (a.k.a. pages) so actually he should use SetPageGadgetAttrs instead of SetGadgetAttrs. Otherwise strange things will happen if the list browser he is changing is not on the page which is currently displayed.

If his listbrowser is located in a page gadget then he should of course use SetPageGadgetAttrs(). I didn't look too closely at his code so I didn't notice it was located in a clicktab page.

Modified code:

void AddNodeToLB (Object *winobj, Object *page, Object *lb, struct Node *node) {
    struct Window *window = NULL;
    struct List *list = NULL;
 
    /* get intuition window and list pointers (window pointer can be NULL) */
    IIntuition->GetAttr(WINDOW_Window, winobj, (Tag *)&window);
    IIntuition->GetAttr(LISTBROWSER_Labels, lb, (Tag *)&list);
 
    if (list) {
        /* remove list temporarily */
        IIntuition->SetAttrs(lb,
            LISTBROWSER_Labels, ~0,
            TAG_END);
 
        /* add our node */
        IExec->AddTail(list, node);
 
        /* add it back and refresh */
        if (page) {
            ILayout->SetPageGadgetAttrs((struct Gadget *)lb, page, window, NULL,
                LISTBROWSER_Labels, list,
                TAG_END);
        } else {
            IIntuition->SetGadgetAttrs((struct Gadget *)lb, window, NULL,
                LISTBROWSER_Labels, list,
                TAG_END);
        }
    }
}

As for being careful about updating tabs that are not currently viewed, I will be adding code to ensure my listbrowser list and object are the ones based on the current tab.

That's not a safe solution. The only 100% safe solution is to use SetPageGadgetAttrs() providing the pointer to the page in question.