_ff-addon-snippet-WinApi_removeMinMaxBtns - On Windows this removes the minimize and maximize button of the targeted window. [jsctypes] [winapi]

_ff-addon-snippet-WinApi_removeMinMaxBtns.js

Cu.import('resource://gre/modules/ctypes.jsm');

var is64bit = ctypes.voidptr_t.size == 4 ? false : true;
var ifdef_UNICODE = true;

var TYPES = {
    ABI: is64bit ? ctypes.default_abi : ctypes.winapi_abi,
    CALLBACK_ABI: is64bit ? ctypes.default_abi : ctypes.stdcall_cabi,

	BOOL: ctypes.bool,
    CHAR: ctypes.char,
    DWORD: ctypes.uint32_t,
    LONG: ctypes.long,
    LPCVOID: ctypes.voidptr_t,
    ULONG_PTR: is64bit ? ctypes.uint64_t : ctypes.unsigned_long,
    WCHAR: ctypes.jschar,
	PVOID: ctypes.voidptr_t,
	INT: ctypes.int,
	UINT: ctypes.unsigned_int
};

// advanced types - based on simple types
TYPES.LPSTR = TYPES.CHAR.ptr;
TYPES.LPCSTR = TYPES.CHAR.ptr;
TYPES.LPDWORD = TYPES.DWORD.ptr;
TYPES.LPCWSTR = TYPES.WCHAR.ptr;
TYPES.LPWSTR = TYPES.WCHAR.ptr;
TYPES.HANDLE = TYPES.PVOID;

// advanced advanced types - based on advanced types
TYPES.HWND = TYPES.HANDLE;
TYPES.HMENU = TYPES.HANDLE
TYPES.LPCTSTR = ifdef_UNICODE ? TYPES.LPCWSTR : TYPES.LPCSTR;
TYPES.LPTSTR = ifdef_UNICODE ? TYPES.LPWSTR : TYPES.LPSTR;

var CONST = {
    GWL_STYLE: -16,
	WS_MINIMIZEBOX: 131072,
	WS_MAXIMIZEBOX: 65536
};

var user32 = ctypes.open('user32');
var GetSystemMenu = user32.declare('GetSystemMenu', TYPES.ABI, TYPES.HMENU, TYPES.HWND, TYPES.BOOL);
var SetWindowPos = user32.declare('SetWindowPos', TYPES.ABI, TYPES.BOOL, TYPES.HWND, TYPES.HWND, TYPES.INT, TYPES.INT, TYPES.INT, TYPES.INT, TYPES.UINT);
var SetWindowLongPtr = user32.declare(is64bit ? (ifdef_UNICODE ? 'SetWindowLongPtrW' : 'SetWindowLongPtrA') : (ifdef_UNICODE ? 'SetWindowLongW' : 'SetWindowLongA'), TYPES.ABI, is64bit ? TYPES.LONG_PTR : TYPES.LONG, TYPES.HWND, TYPES.INT, is64bit ? TYPES.LONG_PTR : TYPES.LONG);
var GetWindowLongPtr = user32.declare(is64bit ? (ifdef_UNICODE ? 'GetWindowLongPtrW' : 'GetWindowLongPtrA') : (ifdef_UNICODE ? 'GetWindowLongW' : 'GetWindowLongA'), TYPES.ABI, is64bit ? TYPES.LONG_PTR : TYPES.LONG, TYPES.HWND, TYPES.INT);
// types, consts, and functions declarations complete, now lets use it
try {
    var hToDOMWindow = Services.wm.getMostRecentWindow('navigator:browser');
    if (!hToDOMWindow) {
        throw new Error('No browser window found');
    }

    var hToBaseWindow = hToDOMWindow.QueryInterface(Ci.nsIInterfaceRequestor)
        .getInterface(Ci.nsIWebNavigation)
        .QueryInterface(Ci.nsIDocShellTreeItem)
        .treeOwner
        .QueryInterface(Ci.nsIInterfaceRequestor)
        .getInterface(Ci.nsIBaseWindow);

    var hToString = hToBaseWindow.nativeHandle;
    var hTo = ctypes.voidptr_t(ctypes.UInt64(hToString));
	
	var style = GetWindowLongPtr(hTo, CONST.GWL_STYLE);
	console.log('style:', style, style.toString());
	
	style = parseInt(style.toString());
	style &= ~CONST.WS_MAXIMIZEBOX; 
	style &= ~CONST.WS_MINIMIZEBOX; 
	
	var rez_set = SetWindowLongPtr(hTo, CONST.GWL_STYLE, style);
	console.log('rez_set:', rez_set, rez_set.toString());
	
} finally {
    user32.close();
    console.log('user32 closed');
}

README

Rev1

• Works