How can i hide the window icon and minimize and maximize button from titlebar using windows api in java swing using, com.sun.jna.platform ?

Question

So basically im new to the windows api and Im trying to hide both maximize, minimize buttons as well as the titlebar icon using the windows api and the java native access library. Here is what i tried so far

private void disableTitleBarIcon() {    
        WinDef.HWND hwnd = new WinDef.HWND(Native.getComponentPointer(this)); 
        int style = User32.INSTANCE.GetWindowLong(hwnd, User32.GWL_STYLE); 
        User32.INSTANCE.SetWindowLong(hwnd, User32.GWL_STYLE, style & ~User32.WS_SYSMENU | User32.WS_CAPTION); 
        User32.INSTANCE.SetWindowPos(hwnd, null, 0, 0, 0, 0, 
        WinUser.SWP_NOMOVE | WinUser.SWP_NOSIZE | WinUser.SWP_NOZORDER | WinUser.SWP_FRAMECHANGED);   
    }

For now I tried disabling SYSMENU but this takes the x button away as well, how can i fix this?

Answer 1

This worked well -

SetWindowLongPtr(hWnd, GWL_EXSTYLE, GetWindowLongPtr(hWnd, GWL_EXSTYLE) | WS_EX_DLGMODALFRAME);
SetClassLongPtr(hWnd, GCLP_HICON, NULL);
SetClassLongPtr(hWnd, GCLP_HICONSM, NULL);
SetWindowLongPtr(hWnd, GWL_STYLE, GetWindowLongPtr(hWnd, GWL_STYLE) & ~(WS_MAXIMIZEBOX | WS_MINIMIZEBOX));
SetWindowPos(hWnd, NULL, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER | SWP_FRAMECHANGED);

Before -

After -

Answer 2

A typical Win32 desktop application created with WS_OVERLAPPEDWINDOW style -

auto exstyle = GetWindowLongPtr(hWnd, GWL_EXSTYLE);
exstyle |= WS_EX_TOOLWINDOW;
SetWindowLongPtr(hWnd, GWL_EXSTYLE, exstyle);
SetWindowPos(hWnd, NULL, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER | SWP_FRAMECHANGED);

After -

Answer 3

To hide the window icon, you could try to use WS_EX_DLGMODALFRAME:

 SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_DLGMODALFRAME);

To hide the minimize and the maximize button, when you create a Win32 desktop application, you could remove WS_MINIMIZEBOX and WS_MAXIMIZEBOX

   HWND hWnd = CreateWindowW(szWindowClass, szTitle, /*WS_OVERLAPPEDWINDOW*/ WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME ,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);

Answer 4

This works for me on Windows 10 22H2, in WM_CREATE of a C++/Win32 app (otherwise it must be refreshed) :

// Remove caption icon
SetClassLongPtr(hWnd, GCLP_HICON, (LONG_PTR)NULL);
SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_DLGMODALFRAME);
// Remove minimize/maximize
SetWindowLong(hWnd, GWL_STYLE, GetWindowLong(hWnd, GWL_STYLE) & ~(WS_MINIMIZEBOX | WS_MAXIMIZEBOX));