how can i disable the maximize button of a window in c++ using opengl?

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this code creates a window which can be minimized and maximzed but i want to disable the maximize button. how can i do ths?

C#

glutInit(&argc,argv);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
glutInitWindowSize(windowWidth,windowHeight);
glutInitWindowPosition(50,50);
glutCreateWindow("gaMe");

Posted 29-Sep-11 19:39pm

Sweety Khan

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enhzflep · Accepted Answer · 2011-09-29T21:19:00

Solution 1

I forget right now how to get the handle of a GLUT window (if indeed GLUT includes a method to do this), though typically the following code will perform this task:

C++

long dwStyle = GetWindowLong(hwnd, GWL_STYLE);
dwStyle ^= WS_MAXIMIZEBOX;
SetWindowLong(hwnd, GWL_STYLE, dwStyle);

1. Get the current window style
2. Toggle the maximize-box bit
3. Send the new style back to the window

You'll just have to either (a) get GLUT to give you a handle for this window, or (2) use the standard windows functions for getting a handle to this window - should be reasonably trivial, since you've created the window and know what it's window text(title) is.

EDIT: Nope, GLUT no includes a function to retrieve a HWND of the main window, you'll have to do this yourself. Please find below a function that will do the lot for you.

Function

C++

void toggleGlutWindowMaximizeBox(char *szWindowTitle)
{
    long dwStyle;
    HWND hwndGlut;

    hwndGlut = FindWindow(NULL, szWindowTitle);

    dwStyle = GetWindowLong(hwndGlut, GWL_STYLE);
    dwStyle ^= WS_MAXIMIZEBOX;
    SetWindowLong(hwndGlut, GWL_STYLE, dwStyle);
}

Example of Use

C++

char *szWindowTitle = "GLUT Shapes";
....
....
....
glutCreateWindow(szWindowTitle);
toggleGlutWindowMaximizeBox(szWindowTitle);

Posted 29-Sep-11 21:19pm

enhzflep

Updated 29-Sep-11 21:44pm

v2

Comments

Sweety Khan 30-Sep-11 6:24am

cOol its done thanx a lOt.
but clear these things
findWindow is used to get the handle of the specified window
wndows style is value of long type
am i right?
what is the fn of ^= and WS_MAXIMIZEBOX?

enhzflep 30-Sep-11 6:41am

Pleasure. :)

1) Yes, FindWindow gets the HWND of a window
2) WindowStyle is 32 yes/no flags stored in a long (also 32 bits)
3) ^= means "XOR equals" - a logical eXclusive OR.

XOR Function
-------------
A | B | Result
0 | 0 | 0
0 | 1 | 1
1 | 0 | 1
1 | 1 | 0

WS_MAXIMIZEBOX = "#define WS_MAXIMIZEBOX 0x10000"
- this is 00000000000000010000000000000000b
So, the code:
<pre>dwStyle ^= WS_MAXIMIZEBOX</pre>
Has the effect of flipping/toggling Bit 16 of dwStyle.

Sweety Khan 1-Oct-11 12:35pm

oh means 16th bit of dwStyle is 1 n it represents tht maximize button is enable, by XORing it with 1 it becomes 0(disable). awesome description

enhzflep 1-Oct-11 12:37pm

Spot-on!
Though, to be fair - I think your description is clearer and more succinct!

Sweety Khan 1-Oct-11 12:44pm

:) one thing more u define window title name as char *szWindowStyle = "game", why *?

enhzflep 1-Oct-11 13:00pm

:confused:

I declared char *szWindowTitle.. You'd originally used a string constant in your call to glutCreateWindow. I just stored it into a variable since I knew I'd need the exact same string for the style-changing function.

Sweety Khan 1-Oct-11 13:08pm

yeh i understand thts why im asking why dont u use string windowtitle = "game";i tried this but its not working

enhzflep 3-Oct-11 9:12am

Easy!
As a c++ coder I made the assumption that you'd be aware of the similarities (and differences) between C-style NULL terminated character strings and C++-style strings. This meant that rather than creating a new project or modifying an old one too heavily I simply chose to use a char*.

Simply make the following changes:
1) Change function signature to void toggleGlutWindowMaximizeBox(string szWindowTitle)
2) Change hwndGlut = FindWindow(NULL, szWindowTitle); to
hwndGlut = FindWindow(NULL, szWindowTitle.c_str());

enhzflep 3-Oct-11 9:15am

Also, GlutCreateWindow can't work with C++ strings. If you store the window title into a string, you'll also have to change calls to this function.

A quick look at the string class documentation tells us that the member function c_str() will give us a NULL terminated C-style string.

Sweety Khan 1-Oct-11 12:45pm

u seems as an expert of opengl. i have posted many ques of opengl. plz have look on them

enhzflep 1-Oct-11 13:02pm

Nah, just what I learnt in the Nehe tutorials and other assorted resources over a period of about 2 months, 5 months ago. I do look reasonably often, and have seen some of your old questions. I'll go back and see if I can't provide some more light on the subjects.

Sweety Khan 2-Oct-11 9:18am

plz have a look on my collision detection question

Sweety Khan 1-Oct-11 13:17pm

thanx, specially the question of sprite animation. i cant work more on my project until i know sprite animation