Where is the example ?
I Asked for a small example ...
Not a complete program but enough to show how it could be used in a real program
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CreateWindow
When using CreateWindow , the first classname could be like "button" or "static". When using the "listbox" it should be able to make a drop down listbox..
How do i fill this listbox with variables ?
How do i get the ID of what i clicked on ?
I want a small example to try on and i want some small comments.
It should be written in c .. Perhaps a little switch statement ?
Thanks in advance Abbe
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Answers
you are talking about a drop down "listbox".
are you meaning a drop down "combobox" ?
it is a static area above a popup list using an arrow
button ?
In that case, you can take a look at the WIN32\FONTVIEW
VC++ sample and the TOOLS.C file
If you are looking for real plain listboxes, here are some
good VC++ samples :
WIN32\PRINTER enumport.c, getcaps.c
WIN32\TTFONTS dialog.c
WIN32\REGISTRY monkey.c
The following is some sample code that should help you. I am writing it by hand without a compiler so I couldn't test it, but I hope you'll be able to make a sense of it. It has comments and some error handling.
/* Declare a static handle for the combo window in the beginning of the source file */
static HWND hMyComboCtrl = NULL;
/* Create the dropdown combobox */
BOOL CreateMyComboCtrl()
{
if (hMyComboCtrl)
return TRUE; /* Already created - resource leak proof */
/* Replace the params between -- */
hMyComboCtrl = CreateWindow("COMBOBOX", --WindowNameStr--, --styleFlags--, --xPos--, --yPos--, --width--, --height--, --hParentWnd--, NULL, --hInstance--, --lpParam--);
if (hMyComboCtrl)
return TRUE;
else
return FALSE;
}
/* To add items */
BOOL InitializeMyComboCtrl()
{
assert(hMyComboCtrl); /* Check if the handle is valid */
LRESULT result = 0;
result |= SendMessage(hMyComboCtrl, LB_ADDSTRING, 0, "item1text");
result |= SendMessage(hMyComboCtrl, LB_ADDSTRING, 0, "item2text");
result |= SendMessage(hMyComboCtrl, LB_ADDSTRING, 0, "item3text");
if (result == LB_ERR || result == LB_ERRSPACE)
return FALSE; /* If any error occurred, return FALSE */
else
return TRUE;
}
int GetMyComboCtrlCurSel()
{
assert(hMyComboCtrl); /* Check if the handle is valid */
return SendMessage(hMyComboCtrl, LB_GETCURSEL, 0, 0);
}
By the way, where are the 300 points? I still see only 200 :)
Davide Marcato.
Hmmm good answer but i need a little bit more ...
The listbox style params which should i use ?
and the final argumet in createwindow lparam havent figure out
how to get it to work...
The |= operator , how does that one work ?
I get the listbox visible but i just cant get the """items""" into it...
Oh by the way is the points 320 and now it must be right or the pointsystem is out of order :)
Let's begin from the last question: no the points are not even 320 - they are 330 if my human viewsystem is still working well :-)
Combobox style: since you want a dropdown combo with a static control showing the currently selected item, I suggest to use CBS_DROPDOWNLIST. I cannot say anything about other combobox-specific and general window styles because I don't have enough info about what you want, anyway the documentation explains them pretty well. In any case, you'll probably want to apply also the window styles WS_VISIBLE and WS_CHILD.
lparam: it is used to pass a pointer to a structure (CREATESTRUCT) that contains creation parameters to the windowproc of the created window. The handling code for WM_CREATE receives a pointer to this structure and can do some initialization if desired.
You don't need to set this parameter in your case - just pass NULL.
operator |= : sintactically the following statements are equivalent:
a = a | b;
a |= b;
Since "|" is the bit-wise OR operator and since the no-error condition in SendMessage() is represented by 0 return value, ORing the return values of 3 subsequent function calls is a compact and readable way to know if *any* of the calls returned an error with only one test in the end!
Hope this answer is exaustive enough...
Davide Marcato.
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by: fasterPosted on 1997-08-03 at 18:38:21ID: 1402782
Normally, you can send messages to manipulate the listbox, for example, SendMessage(handle,LB_ADDS
To get the selection, just send LB_GETCURSEL to the listbox with wparam and lparam of 0, the return value is the index of the selected item