Controls

Hello there..I need some help with controls in WIN APIs..Actually I just began programming in windows for an assignment and am not used to it. My problem is as follows:




I need to to display a string to a textbox when a button is ...So I used this piece of code in the "switch(Message)" :

Code:

case WM_COMMAND:
			switch(LOWORD(wParam))
			{
				case IDC_ADD:
				{

			SetDlgItemText(hwnd, IDC_TEXT, "This is a string");
			
}break;
}

Where IDC_... is defined in a header file and used in a resource file as follows:

Code:

IDD_MAIN DIALOG DISCARDABLE  0, 0, 207, 156
STYLE DS_MODALFRAME | DS_CENTER | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "Controls One"
FONT 8, "MS Sans Serif"
BEGIN
    LTEXT           "Add",IDC_STATIC,7,10,14,8
    EDITTEXT        IDC_TEXT,25,7,120,14,ES_AUTOHSCROLL
    EDITTEXT        IDC_NUMBER,150,7,21,14,ES_NUMBER
    LTEXT           "times.",IDC_STATIC,177,10,23,8
    LISTBOX         IDC_LIST,7,25,138,106,LBS_NOINTEGRALHEIGHT | 
                    LBS_EXTENDEDSEL | WS_VSCROLL | WS_TABSTOP
    PUSHBUTTON      "&Add",IDC_ADD,150,30,50,14
    PUSHBUTTON      "&Remove",IDC_REMOVE,150,47,50,14
    PUSHBUTTON      "&Clear",IDC_CLEAR,150,63,50,14
    LTEXT           "This item was added",IDC_STATIC,7,141,66,8
    CTEXT           "-",IDC_SHOWCOUNT,77,141,32,8
    LTEXT           "times",IDC_STATIC,114,141,17,8
END

BUT the project wont compile ..Displaying the error that STYLE DS_MODALFRAME is wrong.. So I tried giving an id for my button in the following code(discarding the definition in the resource file and in the header for the controls):

Code:

        //create a default push button
        CreateWindowEx(0,                                      //more or 'extended' styles
                       TEXT("BUTTON"),                         //'class' of control to create
                       TEXT("Roll Dice"),            //the control caption
                       WS_CHILD|WS_VISIBLE|BS_DEFPUSHBUTTON,   //control style: how it looks
                       500,                                     //control position: left
                       250,                                     //control position: top
                       100,                                    //control width
                       30,                                     //control height
                       hwnd,                                   //parent window handle
                       NULL,                                   //control's ID
                       g_hInst,                                //application instance
                       NULL);

Now the project compiles but the button dont work....CAN ANYONE PLZ HELP ME OUT??



Compiler : DEV C++
OS: WIN XP
Source code obtained from: theForger's Win32 API Tutorial & http://www.foosyerdoos.fsnet.co.uk/

Superdooper quick fix...
Change

Code:

NULL,                                   //control's ID

to

Code:

(HMENU)0x69,                                   //control's ID

Then change

Code:

case IDC_ADD:

to

Code:

case 0x69:

That should make it work, although it's not terribly good form. Use a MessageBox to test.

Ooohh Thx dude...u saved me hours of search over the net and hopeless compiling...n I raally badly needed time to complete the work..thx again...I guess I might define the IDs in the header.

And WHY the solution works....

or I find debugging easier when I can read IDC_ADD rather and 0x69.


To use dialogs and controls.

You should have a resource.h file

It will have all your ID values in it

#define IDD_DIALOG1 132

You will also have a .rc file containing the definitions (sizes, styles ect) of the dialogs / controls.

If you use the WS_CHILD style then the HMENU paramater becomes the ID of the control.




So I would have

Added to the resource.h file and included it in the same file as the callback.
#define IDC_ADD 40001//define the ADD buttons ID number

Change the HMENU paramater in your create to
(HMENU)IDC_ADD //tell the button its ID is 40001


Also....
Check that the the 'event' that caused the message to be sent [HWORD(wParam)] was the button being clicked/pressed (not redrawn, resized ect).

case IDC_ADD:
if(HIWORD(wParam)==BN_CLICKED)//Button Notification CLICKED

This is not needed so much with buttons but is required for more complex controls such as listviews, treeviews or datetime pickers.

MAKEINTRESOURCE() may be required in some functions

HCURSOR hHourGlass=LoadCursor(NULL,MAKEINTRESOURCE(IDC_WAI T));

Yes, thats exactly What I've done...Defined the button ID number in the headr file and use the name instead when assigning the ID to the control...But still I cannot create the definitions (sizes, styles ect) of the dialogs / controls in the .rc file..The compiler returns a syntax error for STYLE...So thats why I usxed this code in the .c file
code:

Code:

        //create a default push button
        CreateWindowEx(0,                                      //more or 'extended' styles
                       TEXT("BUTTON"),                         //'class' of control to create
                       TEXT("Roll Dice"),            //the control caption
                       WS_CHILD|WS_VISIBLE|BS_DEFPUSHBUTTON,   //control style: how it looks
                       500,                                     //control position: left
                       250,                                     //control position: top
                       100,                                    //control width
                       30,                                     //control height
                       hwnd,                                  //parent window handle
                       (HMENU)IDC_ROLL,               //control's ID
                       g_hInst,                               //application instance
                       NULL);

its working fine..but still I want to know the other way..that is that of defining the styles in the .rc file

>>defining the styles in the .rc file<<

Those constants are defined elsewhere in the windows headers - including windows.h in your resource script should make sure they are properly defined.

Okay. Now am having quite an issue with a button. I had to change a button's caption once it has been clicked..Thats fine.
On button click a function is accessed and processing is done
What I need to do is to use the same button to stop processing.....I need to use something like keydown but I have not been able to get to know whta it should be..

In fact the processing is in a 'while loop' so I wanted to place an if statement in there to detect the button's click and change a state variable so that the loops stops...can anyone plz guide my search?