Create Window Without Title Bar

Opening a window that has no title bar with Win32

hWnd = CreateWindow(szWindowClass, 0, (WS_BORDER ), 0, 0, WINDOW_WIDTH, WINDOW_HEIGHT, NULL, NULL, hInstance, NULL); 

SetWindowLong(hWnd, GWL_STYLE, 0); //remove all window styles, check MSDN for details

ShowWindow(hWnd, SW_SHOW); //display window

Created windows have no title

I am posting the answer to the question as suggested by a comment :
The answer is that for the window creation to complete, the pWndProc passed to RegisterClass WINAPI has to process default messages (in particular OS messages).
During the execution of CreateWindow(after the call has started and before it has returned), the pWndProc function already receives messages that it has to process, in my case it didn't process them.
This is a standard pWndProc function:

LRESULT CALLBACK pWndProc(HWND hwnd,            // Handle to our main window
    UINT Msg,             // Our message that needs to be processed
    WPARAM wParam,        // Extra values of message 
    LPARAM lParam)        // Extra values of message
{
        switch (Msg)

        {
    case WM_DESTROY: 
...
    default:
        return DefWindowProc(hwnd, Msg, wParam, lParam);
         }
}

source :

A window procedure does not usually ignore a message. If it does not process a message, it must send the message back to the system for default processing. The window procedure does this by calling the DefWindowProc function, which performs a default action and returns a message result. The window procedure must then return this value as its own message result. Most window procedures process just a few messages and pass the others on to the system by calling DefWindowProc.

WinAPI: Create resizable window without title bar, but with minimize/maximize/close buttons (as Firefox/Chrome/Opera)

The programs remove the non-client area (the title bar) and have a bunch of custom handling for reproducing the window buttons, icons, system menu etc. The benefit of this is that they can draw to the new "title bar", which is actually part of the standard client area, adding tabs or other custom controls.

The following two articles will show you how to do this on Vista and above (using the DWM):

• Setting up a custom title bar on Windows Vista / 7
• Setting up a custom title bar - reprise This one has a demo app showing the result of a number of variations / options.

This is very complex to do and get right, so the above two articles are invaluable. The author must have put a lot of work into them! Both links have example code written in Delphi, but it should be easy enough to translate it to C++ - the concepts are identical, it's just syntax.

You might also be interested in general resources on Glass and DWM, since it's all closely related. You'll spot the above two links included in that list :)

glfw window with no title bar

@tomasantunes help me figure this out.

in setFullscreen I am setting the window to be at 0, 0 or the top left of the screen. The title bar didn't actually disappear is was just off screen. so if I set the window to be at 100, 100 instead I get the title bar back. This was pretty dumb of me to make a stupid mistake like this.

if (!fullscreen) {
    glfwSetWindowMonitor(m_window, nullptr, 0, 0, m_width, m_height, GLFW_DONT_CARE); // I set the position to 0,0 in the 3rd and 4th parameter
    glViewport(0, 0, m_width, m_height);
}

Fixed code:

if (!fullscreen) {
    glfwSetWindowMonitor(m_window, nullptr, 100, 100, m_width, m_height, GLFW_DONT_CARE); // I set the position to 100, 100 
    glViewport(0, 0, m_width, m_height);
}

New result:

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