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So i'm trying to write a toggle fullscreen function for my game.
It works.. kinda, problem is the first SetWindowLongPtr() call causes a WM_SIZE message to be queued and sent to my WNDPROC (on MSDN i read changes to the window style are only cached and have to be applied using SetWindowPos() though).
SetWindowLongPtr(m_hWnd, GWL_STYLE, dwStyle);
SetWindowLongPtr(m_hWnd, GWL_EXSTYLE, dwExStyle);
SetWindowPos(m_hWnd, NULL, fullscreen ? 0 : window.left, fullscreen ? 0 : window.top, window.right, window.bottom, SWP_NOZORDER | SWP_FRAMECHANGED);
ShowWindow(m_hWnd, SW_SHOW);
When changing from windowed to fullscreen mode the client area gets resized to the window rect and updated like that (so now 'contains' the bars etc.).
Apart from causing my program to destroy the Vulkan context twice, this makes me save the wrong window dimensions for reverting to windowed mode later on (this is done when WM_SIZE occurs and when the game is in fullscreen mode).
Afterwards it's sized to the correct dimensions by SetWindowPos().
I mean i could certainly just hack in a bool to discard the WM_SIZE message when it should be, but i'm looking for a better and maybe less bodged way.
Is there a function to temporarily disable window messages or just the user def WNDPROC?
This is the function that I use to toggle fullscreen on and off.
I got this function from Raymond Chen.
I don't know if it messes with Vulkan though but it works with OpenGL.
WINDOWPLACEMENT GlobalWindowPosition = {sizeof(GlobalWindowPosition)};
void ToggleFullscreen(HWND WindowHandle)
{
DWORD Style = GetWindowLong(WindowHandle, GWL_STYLE);
if(Style & WS_OVERLAPPEDWINDOW)
{
MONITORINFO MonitorInfo = {sizeof(MonitorInfo)};
if(GetWindowPlacement(WindowHandle, &GlobalWindowPosition) &&
GetMonitorInfo(MonitorFromWindow(WindowHandle, MONITOR_DEFAULTTOPRIMARY),
&MonitorInfo))
{
SetWindowLong(WindowHandle, GWL_STYLE,
Style & ~WS_OVERLAPPEDWINDOW);
SetWindowPos(WindowHandle, HWND_TOP,
MonitorInfo.rcMonitor.left, MonitorInfo.rcMonitor.top,
MonitorInfo.rcMonitor.right - MonitorInfo.rcMonitor.left,
MonitorInfo.rcMonitor.bottom - MonitorInfo.rcMonitor.top,
SWP_NOOWNERZORDER | SWP_FRAMECHANGED);
}
}
else
{
SetWindowLong(WindowHandle, GWL_STYLE, Style | WS_OVERLAPPEDWINDOW);
SetWindowPlacement(WindowHandle, &GlobalWindowPosition);
SetWindowPos(WindowHandle, NULL, 0, 0, 0, 0,
SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER |
SWP_NOOWNERZORDER | SWP_FRAMECHANGED);
}
}
I have read a lot of Stack Overflow over the years when struggling with making sense of Microsoft Windows' strange world of CreateWindowEx() .. etc. This question, when originally asked was "What is the best way to create a fluidly resizable OpenGL window in WinAPI?"
I've been struggling with getting WinAPI to make a window that:
Has an OpenGL context
Is properly centered on the main monitor (or any monitor determined by command line signal) in both multi-monitor and single-monitor displays when in "Windowed" mode or in "Fullscreen" mode
Has a fixed internal client screen size (viewport 2d)
Doesn't allow you to click outside causing it to lose focus at the wrong times or in special cases for multi-monitor
Can be resized fluidly, but doesn't change internal "client size" (meaning that it stretches the OpenGL content which is a fixed size to the new screen size) ... the idea here is to add a layer of virtualization, so that all pixels are expressed in the same 1920x1080 (1080p) coordinate system. This part is no problem for me.
Correctly handles mouse event translation from screen_size -> client_size equivalent via the screen->client ratio
In my homegrown App framework, I have to set the display size, and even then, Windows doesn't give me the right sized window. (Sometimes the title bar is subtracted, sometimes the scrollbars are subtracted, but the context draws under the title bar, for example.)
Also, recently when moving from 2010 EE (Win32 / Windows 7) to 2015 (win32 / Windows 10), I had to change the parameters to recenter the view because it was off-centered on the main display. Now, only sometimes are these values correct or incorrect. If I go "fullscreen" for example, the same values will draw above the top of the screen such that there is an area at the bottom of the screen that shows the "gl clear color" (in my case, orange)
I can play with these things by providing the following command line parameters:
-bordered (default, and has no effect really, is the default windowed mode with the title bar and such)
-borderless (seems to go into fullscreen mode, with the app off-center where win 0,0 is actually in screen center)
-windowed (or -window)
If I don't provide -window, it defaults to "full screen" resolution-adjusted (but only if supported I assume, otherwise it might throw an error).
Anyway, all of this is very bad because
a) I have to write a bajillion cases for each resolution I'm working in, rather than write everything for 1080p and have it adjust to display size, which is what i want because it handles most new displays on laptops and desktops (this is Windows remember) (and only slightly squishes things in those corner cases)
b) I cannot resize the window fluidly, also i have to trap the mouse at center and recalculate the mouse position, so I record only the deltas -- this is to avoid the mouse leaving the window and clicking the desktop, or floating off the monitor to some other monitor, even when it is hidden. I also have to make the mouse cursor invisible so the user doesn't see this, then show a simulated mouse cursor.
c) Users who don't support specifically 1920x1080 won't be able to use full screen mode
Someone pointed this article out in another question (window border width and height in Win32 - how do I get it?):
https://web.archive.org/web/20120716062211/http://suite101.com/article/client-area-size-with-movewindow-a17846
And I've read through this, learning that AdjustWindowRectEx() has some issues:
AdjustWindowRectEx() and GetWindowRect() give wrong size with WS_OVERLAPPED
I don't use WS_OVERLAPPED, so this was only moderately helpful:
AdjustWindowRectEx() and GetWindowRect() give wrong size with WS_OVERLAPPED
Here's how I do it now:
display.Resized(display.w,display.h);
// Fill in the window class structure for testing display type.
winclass.cbSize = sizeof(WNDCLASSEX);
winclass.style = CS_DBLCLKS | CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
winclass.lpfnWndProc = WinProc;
winclass.cbClsExtra = 0;
winclass.cbWndExtra = 0;
winclass.hInstance = hinstance;
winclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
winclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
winclass.hCursor = LoadCursor(NULL, IDC_ARROW);
winclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
winclass.lpszMenuName = NULL;
winclass.lpszClassName = WINDOW_CLASS_NAME;
// Save the game instance handle
display.hinstance = game_instance = hinstance;
// Register the window class
if (!RegisterClassEx(&winclass)) return(0);
if (!gl.Init(hinstance, display.bits)) {
return(0);
}
// Detect the display size and create the final display profile
DWORD winStyle=
WS_EX_APPWINDOW |
WS_EX_TOPMOST /*|
WS_EX_ACCEPTFILES*/ ;
// Adjust Window, Account For Window Borders
int xPos = GetSystemMetrics(SM_CXSCREEN) - display.w;
int yPos = GetSystemMetrics(SM_CYSCREEN) - display.h;
RECT windowRect = {0, 0, display.w, display.h}; // Define Our Window Coordinates
AdjustWindowRectEx (&windowRect, WS_POPUP, 0, winStyle );
// Create the window
if (!(hwnd = CreateWindowEx(
winStyle, // extended style
WINDOW_CLASS_NAME, // class
gl.winTitle.c_str(), // title
( gl.borderless || CmdLine.Option("-borderless") ) ? (WS_POPUPWINDOW | WS_VISIBLE)
: (gl.noFullscreen ? ((CmdLine.Option("-bordered") ? WS_BORDER : 0) | WS_VISIBLE)
: (WS_POPUP | WS_VISIBLE)), // use POPUP for full screen
gl.noFullscreen && !CmdLine.Option("-recenter") ? xPos / 2 : 0,
gl.noFullscreen && !CmdLine.Option("-recenter") ? yPos / 2 : 0, // initial game window x,y
display.w, // initial game width
display.h, // initial game height
HWND_DESKTOP, // handle to parent
NULL, // handle to menu
hinstance, // instance of this application
NULL)
) // extra creation parms
) {
OUTPUT("WinAPI ERROR: Could not open window.\n");
return(0);
}
if (gl.borderless || CmdLine.Option("-borderless") ) {
LONG lStyle = GetWindowLong(hwnd, GWL_STYLE);
lStyle &= ~(WS_CAPTION | WS_THICKFRAME | WS_MINIMIZE | WS_MAXIMIZE | WS_SYSMENU);
SetWindowLong(hwnd, GWL_STYLE, lStyle);
LONG lExStyle = GetWindowLong(hwnd, GWL_EXSTYLE);
lExStyle &= ~(WS_EX_DLGMODALFRAME | WS_EX_CLIENTEDGE | WS_EX_STATICEDGE);
SetWindowLong(hwnd, GWL_EXSTYLE, lExStyle);
SetWindowPos(hwnd, NULL, 0, 0, display.w, display.h, SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_NOOWNERZORDER);
}
// Temporary change to full screen mode
ZeroMemory(&game_screen, sizeof(game_screen)); // clear out size of DEVMODE struct
game_screen.dmSize = sizeof(game_screen);
game_screen.dmPelsWidth = display.w;
game_screen.dmPelsHeight = display.h;
game_screen.dmBitsPerPel = display.bits;
game_screen.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL;
ChangeDisplaySettings(&game_screen, CDS_FULLSCREEN);
// save the game window handle
display.hwnd = game_window = hwnd;
display.hdc = game_dc = GetDC(display.hwnd = game_window); // get the GDI device context
// set up the pixel format desc struct
pfd = {
sizeof(PIXELFORMATDESCRIPTOR), // size of this PFD
1, // version number
PFD_DRAW_TO_WINDOW | // supports window
PFD_SUPPORT_OPENGL | // supports OpenGL
PFD_DOUBLEBUFFER, // support double buff
PFD_TYPE_RGBA, // request RGBA format
(BYTE)display.bits, // select color depth
0, 0, 0, 0, 0, 0, // color bits ignored
0, // no alpha buff
0, // shift bit ignored
0, // no accum buff
0, 0, 0, 0, // accum bits ignored
16, // 16-bit Z-buff (depth buff)
0, // no stencil buff
0, // no aux buff
PFD_MAIN_PLANE, // main drawing layer
0, // reserved
0, 0, 0 // layer masks ignored
};
int pf; // pixel format
if (!gl.arbMultisampleSupported) {
if (!(pf = ChoosePixelFormat(game_dc, &pfd))) // match the pixel format
{
MessageBox(game_window, "OpenGL could not be initialized -- ChoosePixelFormat Error ; report this to program authors for help!", "OpenGL Error", MB_OK);
return FALSE; // error returned
}
} else {
pf = gl.arbMultisampleFormat;
}
if (!SetPixelFormat(game_dc, pf, &pfd)) // set the pixel format
{
MessageBox(game_window, "OpenGL could not be initialized -- SetPixelFormat Error ; report this to program authors for help!", "OpenGL Error", MB_OK);
return FALSE; // error returned
}
if (!(game_rc = wglCreateContext(game_dc))) // create the rendering context
{
MessageBox(game_window, "OpenGL could not be initialized -- CreateContext Error ; report this to program authors for help!", "OpenGL Error", MB_OK);
return FALSE; // error returned
}
if (!(upload_rc = wglCreateContext(game_dc))) // create the rendering context
{
MessageBox(game_window, "Multiple OpenGL contexts could not be initialized -- CreateContext Error ; report this to program authors for help!", "OpenGL Error", MB_OK);
return FALSE; // error returned
} else { // Share as much as you can between two contexts
if (!wglShareLists(game_rc, upload_rc)) {
// could use GetLastError here
MessageBox(game_window, "wglShareLists -- Error ; report this to program authors for help!", "OpenGL Error", MB_OK);
return FALSE; // error returned
}
}
if (!wglMakeCurrent(game_dc, display.hglrc = game_rc)) // make it current
{
MessageBox(game_window, "OpenGL could not be initialized -- MakeCurrent Error ; report this to program authors for help!", "OpenGL Error", MB_OK);
return FALSE; // error returned
}
ShowCursor(false);
ShowWindow(game_window, SW_SHOWNORMAL);
SetForegroundWindow(game_window);
In the above code, what I get is a window that has no resize functionality, hides the OS mouse cursor, and can only be exitted with ALT-TAB (or ALT-F4), and when it is exitted appears at the back of the windows Z-order. I always open my window using a parameter that sets display.w to 1920 and display.h to 1080, either in full screen or in Windowed mode. WM_SIZE is then called to adjust it to the client area.
Please note that the following WM_SIZE is called during the WinProc right after the initial time I set display.Resized(w,h):
case WM_SIZE:
{
display.Resized(LOWORD(lparam), HIWORD(lparam));
return (0);
}
break;
This is executed exactly once during app load, and in the first case it looks like the values are: 1918,1078
UPDATE: If I use the result of GetWindowRect() here, or GetClientRect() as shown below, the window mysteriously moves to Center-X,Center-Y of screen! What gives??
// RECT rect;
// if ( GetClientRect(hwnd,&rect) ) {
// display.Resized((int)rect.right,(int)rect.bottom);
// }
//if ( GetWindowRect( hwnd, &rect ) ) {
// display.Resized((int)ADIFF(rect.left,rect.right),(int)ADIFF(rect.top,rect.bottom));
//}
display.Resized(LOWORD(lparam), HIWORD(lparam));
return (0);
What steps do I need to take to make the window stretchable such that the context is resized to the view, and the mouse is properly adjusted based on the screen ratio?
Basically, there are too many edge cases to make sense of all of this. As time has gone on since the 2 years ago that I asked this question, I've had other inconsistencies between full screen and window emerge.
From what I understand there are basically 3 types of windows:
Your normal on-screen moveable/resizable window for windowing GUIs, like this browser window (if you are not on mobile)
One matched to a display's resolution support (including resolutions smaller than its native) -- we call this "Full screen" (or Fullscreen, which isn't even a word)
One that is a normal on-screen window, but lacks a title bar, borders and scroll bars, and appears as large as the screen. Referred to "on the street" as a "Borderless Window"
I want to master all of these but in a way that makes them all accessible and doesn't require special cases. I've basically given up on doing so with WinAPI, but obviously multiple companies do this. Following Microsoft's documentation isn't very helpful, and I've experimented with a lot of different CreateWindow CreateWindowEx -- many of these features are deprecated by the way, or don't work at all.
(Maybe the best question is, WHEN WILL MICROSOFT CLEAN UP THIS CRAP? But I think we all know the answer.) .. any help to get it working would be appreciated.
I'm now working in: C++, Windows API, OpenGL 3.x / 4.x, Windows 10.
I am trying to resize the window of another application (an ipoker client window), using this code:
SetWindowPos(hwnd, HWND_NOTOPMOST, x, y, width, height, SWP_ASYNCWINDOWPOS | SWP_NOACTIVATE | SWP_NOOWNERZORDER | SWP_NOZORDER);
Now this resizes the window properly, but the client area is not getting redrawn (meaning its just clipped to fit the new window area). This is how it should look:
how the window looks properly
But this is how it actually looks: client area is just being clipped
So I've inspected the messages the window receives upon resizing it by mouse (which works fine) with Spy++ and tried to just send all of them to the window using SendMessage(..), but without any luck as well.
WINDOWPOS wpos;
wpos.hwnd = hWnd;
wpos.x = x;
wpos.y = y;
wpos.cx = nWidth;
wpos.cy = nHeight;
wpos.flags = SWP_NOZORDER | SWP_NOACTIVATE | SWP_NOMOVE | 1000;
NCCALCSIZE_PARAMS params;
params.lppos = &wpos;
params.rgrc[0] = { x, y, width, height};
params.rgrc[1] = rcWindow; // rect of the window before resize
params.rgrc[2] = rcClient; // rect of the client before resize
SendMessage(hWnd, WM_WINDOWPOSCHANGED, 0, LPARAM(&wpos));
wpos.flags = SWP_NOZORDER | SWP_NOACTIVATE;
SendMessage(hwnd, WM_SIZE, SIZE_RESTORED, MAKELPARAM(nWidth, nHeight));
SendMessage(hwnd, WM_WINDOWPOSCHANGING, 0, LPARAM(&wpos));
wpos.flags = SWP_NOZORDER | SWP_NOACTIVATE | SWP_NOMOVE | 1800;
SendMessage(hwnd, WM_NCCALCSIZE, WPARAM(TRUE), LPARAM(¶ms));
Do you have any idea why all of this is not working? Is there no way around subclassing the window (I dont have any experience with that..)? I've also tried to resize the window using placemint (a window positioning tool), but it turns out to have the same problem. The only way to force it to redraw I've found is resize it manually.
I am newbie to winapi. I have seen an example to capture desktop excluding some windows at codeproject
There a child window is created and it is captured.
hwndMag = CreateWindow(WC_MAGNIFIER, TEXT("MagnifierWindow"),
WS_CHILD | MS_SHOWMAGNIFIEDCURSOR | WS_VISIBLE,
0, 0, m_ScreenX, m_ScreenY,
hostDlg->GetSafeHwnd(), NULL, hInstance, NULL );
Instead of creating a child window, I want to create a parent window.
I have tried with this code.
hwndMag = CreateWindow(WC_MAGNIFIER, TEXT("MagnifierWindow"),
MS_SHOWMAGNIFIEDCURSOR | WS_VISIBLE,
0, 0, m_ScreenX, m_ScreenY,
NULL , NULL, hInstance, NULL );
A new window is visible with black screen. And even when I click the capture button the window is stucked.
Why is this happening and How can I make that work with a new parent window?
Thanks
The magnifier window should be a child window. It therefore needs a host parent window. The example code on MSDN shows how to do it:
BOOL CreateMagnifier(HINSTANCE hInstance)
{
// Register the host window class.
WNDCLASSEX wcex = {};
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = 0;
wcex.lpfnWndProc = HostWndProc;
wcex.hInstance = hInstance;
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(1 + COLOR_BTNFACE);
wcex.lpszClassName = WindowClassName;
if (RegisterClassEx(&wcex) == 0)
return FALSE;
// Create the host window.
hwndHost = CreateWindowEx(WS_EX_TOPMOST | WS_EX_LAYERED | WS_EX_TRANSPARENT,
WindowClassName, WindowTitle,
WS_CLIPCHILDREN,
0, 0, 0, 0,
NULL, NULL, hInstance, NULL);
if (!hwndHost)
{
return FALSE;
}
// Make the window opaque.
SetLayeredWindowAttributes(hwndHost, 0, 255, LWA_ALPHA);
// Create a magnifier control that fills the client area.
hwndMag = CreateWindow(WC_MAGNIFIER, TEXT("MagnifierWindow"),
WS_CHILD | MS_SHOWMAGNIFIEDCURSOR | WS_VISIBLE,
0, 0,
LENS_WIDTH,
LENS_HEIGHT,
hwndHost, NULL, hInstance, NULL );
if (!hwndMag)
{
return FALSE;
}
return TRUE;
}
This same documentation also says:
The magnifier control must be hosted in a window created with the WS_EX_LAYERED extended style. After creating the host window, call SetLayeredWindowAttributes to set the opacity of the host window. The host window is typically set to full opacity to prevent the underlying screen content from showing though. The following example shows how to set the host window to full opacity:
SetLayeredWindowAttributes(hwndHost, NULL, 255, LWA_ALPHA);
If you apply the WS_EX_TRANSPARENT style to the host window, mouse clicks are passed to whatever object is behind the host window at the location of the mouse cursor. Be aware that, because the host window does not process mouse clicks, the user will not be able to move or resize the magnification window by using the mouse.
The MSDN example above illustrates this. And the CodeProject article that you link to also adheres to these rules. You must do likewise.
in case it's of interest, I created a sample app which uses the magnification API a while back called "Windows 7 UI Automation Client API C# sample (focus tracking)", available at https://code.msdn.microsoft.com/Windows-7-UI-Automation-6390614a. The app tracks where keyboard focus is, and then shows the element with focus in a magnification window, (and inverts the colors using the magnification API). This is a C# app, so it uses interop to access the magnification API.
A screenshot of the results is shown below.
Thanks,
Guy
I have a window, which I SetWindowPos(window, HWND_TOP, 0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN), SWP_FRAMECHANGED);
It covers the whole screen, ok, but it takes a while (0.5 sec) to cover the taskbar as well.
Is there a way to come over the taskbar immediately? I found that setting HWND_TOPMOST does it immediately, but it stays above all the other windows, even if I switch the app - this is something I don't want. Also, if I first hide the window and then show it, it somehow forces the window to redraw and covers the taskbar immediately, but it flickers (because of the hiding). Is there another way?
Edit 2. There is even a better way for doing fullscreen, the chromium way, source taken from here:
http://src.chromium.org/viewvc/chrome/trunk/src/ui/views/win/fullscreen_handler.cc?revision=HEAD&view=markup
void FullscreenHandler::SetFullscreenImpl(bool fullscreen, bool for_metro) {
ScopedFullscreenVisibility visibility(hwnd_);
// Save current window state if not already fullscreen.
if (!fullscreen_) {
// Save current window information. We force the window into restored mode
// before going fullscreen because Windows doesn't seem to hide the
// taskbar if the window is in the maximized state.
saved_window_info_.maximized = !!::IsZoomed(hwnd_);
if (saved_window_info_.maximized)
::SendMessage(hwnd_, WM_SYSCOMMAND, SC_RESTORE, 0);
saved_window_info_.style = GetWindowLong(hwnd_, GWL_STYLE);
saved_window_info_.ex_style = GetWindowLong(hwnd_, GWL_EXSTYLE);
GetWindowRect(hwnd_, &saved_window_info_.window_rect);
}
fullscreen_ = fullscreen;
if (fullscreen_) {
// Set new window style and size.
SetWindowLong(hwnd_, GWL_STYLE,
saved_window_info_.style & ~(WS_CAPTION | WS_THICKFRAME));
SetWindowLong(hwnd_, GWL_EXSTYLE,
saved_window_info_.ex_style & ~(WS_EX_DLGMODALFRAME |
WS_EX_WINDOWEDGE | WS_EX_CLIENTEDGE | WS_EX_STATICEDGE));
// On expand, if we're given a window_rect, grow to it, otherwise do
// not resize.
if (!for_metro) {
MONITORINFO monitor_info;
monitor_info.cbSize = sizeof(monitor_info);
GetMonitorInfo(MonitorFromWindow(hwnd_, MONITOR_DEFAULTTONEAREST),
&monitor_info);
gfx::Rect window_rect(monitor_info.rcMonitor);
SetWindowPos(hwnd_, NULL, window_rect.x(), window_rect.y(),
window_rect.width(), window_rect.height(),
SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED);
}
} else {
// Reset original window style and size. The multiple window size/moves
// here are ugly, but if SetWindowPos() doesn't redraw, the taskbar won't be
// repainted. Better-looking methods welcome.
SetWindowLong(hwnd_, GWL_STYLE, saved_window_info_.style);
SetWindowLong(hwnd_, GWL_EXSTYLE, saved_window_info_.ex_style);
if (!for_metro) {
// On restore, resize to the previous saved rect size.
gfx::Rect new_rect(saved_window_info_.window_rect);
SetWindowPos(hwnd_, NULL, new_rect.x(), new_rect.y(),
new_rect.width(), new_rect.height(),
SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED);
}
if (saved_window_info_.maximized)
::SendMessage(hwnd_, WM_SYSCOMMAND, SC_MAXIMIZE, 0);
}
}
Edit.
It is probably better to create a fullscreen window as BrendanMcK pointed it out in a comment to this answer, see this link: http://blogs.msdn.com/b/oldnewthing/archive/2005/05/05/414910.aspx ("How do I cover the taskbar with a fullscreen window?")
The new code using the link above would be:
HWND CreateFullscreenWindow(HWND hwnd)
{
HMONITOR hmon = MonitorFromWindow(hwnd,
MONITOR_DEFAULTTONEAREST);
MONITORINFO mi = { sizeof(mi) };
if (!GetMonitorInfo(hmon, &mi)) return NULL;
return CreateWindow(TEXT("static"),
TEXT("something interesting might go here"),
WS_POPUP | WS_VISIBLE,
mi.rcMonitor.left,
mi.rcMonitor.top,
mi.rcMonitor.right - mi.rcMonitor.left,
mi.rcMonitor.bottom - mi.rcMonitor.top,
hwnd, NULL, g_hinst, 0);
}
Old answer below - do not use it, stays only for the record on how NOT to do this.
You have to hide taskbar and menubar to see fullscreen immediately.
Here is the code (uses WTL), call SetFullScreen(true) to go into full screen mode:
template <class T, bool t_bHasSip = true>
class CFullScreenFrame
{
public:
bool m_fullscreen;
LONG m_windowstyles;
WINDOWPLACEMENT m_windowplacement;
CFullScreenFrame()
:
m_fullscreen(false),
m_windowstyles(0)
{ }
void SetFullScreen(bool fullscreen)
{
ShowTaskBar(!fullscreen);
T* pT = static_cast<T*>(this);
if (fullscreen) {
if (!m_fullscreen) {
m_windowstyles = pT->GetWindowLongW(GWL_STYLE);
pT->GetWindowPlacement(&m_windowplacement);
}
}
// SM_CXSCREEN gives primary monitor, for multiple monitors use SM_CXVIRTUALSCREEN.
RECT fullrect = { 0 };
SetRect(&fullrect, 0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN));
WINDOWPLACEMENT newplacement = m_windowplacement;
newplacement.showCmd = SW_SHOWNORMAL;
newplacement.rcNormalPosition = fullrect;
if (fullscreen) {
pT->SetWindowPlacement(&newplacement);
pT->SetWindowLongW(GWL_STYLE, WS_VISIBLE);
pT->UpdateWindow();
} else {
if (m_fullscreen) {
pT->SetWindowPlacement(&m_windowplacement);
pT->SetWindowLongW(GWL_STYLE, m_windowstyles);
pT->UpdateWindow();
}
}
m_fullscreen = fullscreen;
}
void ShowTaskBar(bool show)
{
HWND taskbar = FindWindow(_T("Shell_TrayWnd"), NULL);
HWND start = FindWindow(_T("Button"), NULL);
if (taskbar != NULL) {
ShowWindow(taskbar, show ? SW_SHOW : SW_HIDE);
UpdateWindow(taskbar);
}
if (start != NULL) {
// Vista
ShowWindow(start, show ? SW_SHOW : SW_HIDE);
UpdateWindow(start);
}
}
};
You also have to add some code to WM_CLOSE message:
case WM_CLOSE:
ShowTaskBar(true);
There is one caveat with this solution, if your application crashes or is killed through task manager, then user losses taskbar on his system permanently! (unless he runs your application again, goes into fullscreen and exits, then he will see the taskbar again).
Earlier in my answer I pointed to "atlwince.h" but that function worked only on Windows CE, the one I pasted above works fine with XP, Vista and 7.
Yup, HWND_TOPMOST does it for me.
Here is a section of code that makes full-screen work well (and quick) for me:
bool enterFullscreen(HWND hwnd, int fullscreenWidth, int fullscreenHeight, int colourBits, int refreshRate) {
DEVMODE fullscreenSettings;
bool isChangeSuccessful;
RECT windowBoundary;
EnumDisplaySettings(NULL, 0, &fullscreenSettings);
fullscreenSettings.dmPelsWidth = fullscreenWidth;
fullscreenSettings.dmPelsHeight = fullscreenHeight;
fullscreenSettings.dmBitsPerPel = colourBits;
fullscreenSettings.dmDisplayFrequency = refreshRate;
fullscreenSettings.dmFields = DM_PELSWIDTH |
DM_PELSHEIGHT |
DM_BITSPERPEL |
DM_DISPLAYFREQUENCY;
SetWindowLongPtr(hwnd, GWL_EXSTYLE, WS_EX_APPWINDOW | WS_EX_TOPMOST);
SetWindowLongPtr(hwnd, GWL_STYLE, WS_POPUP | WS_VISIBLE);
SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, fullscreenWidth, fullscreenHeight, SWP_SHOWWINDOW);
isChangeSuccessful = ChangeDisplaySettings(&fullscreenSettings, CDS_FULLSCREEN) == DISP_CHANGE_SUCCESSFUL;
ShowWindow(hwnd, SW_MAXIMIZE);
return isChangeSuccessful;
}
Note that this will change the resolution if you tell it the wrong settings. This is what I usually want, but if you don't like that, you can find out your resolution by using (where mainWindow is returned from something like CreateWindow() or CreateWindowEx()):
windowHDC = GetDC(mainWindow);
fullscreenWidth = GetDeviceCaps(windowHDC, DESKTOPHORZRES);
fullscreenHeight = GetDeviceCaps(windowHDC, DESKTOPVERTRES);
colourBits = GetDeviceCaps(windowHDC, BITSPIXEL);
refreshRate = GetDeviceCaps(windowHDC, VREFRESH);
When you want to get out of full-screen you do something like this:
bool exitFullscreen(HWND hwnd, int windowX, int windowY, int windowedWidth, int windowedHeight, int windowedPaddingX, int windowedPaddingY) {
bool isChangeSuccessful;
SetWindowLongPtr(hwnd, GWL_EXSTYLE, WS_EX_LEFT);
SetWindowLongPtr(hwnd, GWL_STYLE, WS_OVERLAPPEDWINDOW | WS_VISIBLE);
isChangeSuccessful = ChangeDisplaySettings(NULL, CDS_RESET) == DISP_CHANGE_SUCCESSFUL;
SetWindowPos(hwnd, HWND_NOTOPMOST, windowX, windowY, windowedWidth + windowedPaddingX, windowedHeight + windowedPaddingY, SWP_SHOWWINDOW);
ShowWindow(hwnd, SW_RESTORE);
return isChangeSuccessful;
}
I set my code to change between full-screen and windowed mode using a hotkey, and I keep the windowed mode variables as global, so that when changing to windowed mode, it stays put.
This code also has the advantage of running in the equivalent of "exclusive mode" (I'm using XP, and haven't tried it on the newer versions of windows), which means it'll be much, much faster. Let me know if I've made any mistakes from condensing the code (from my much bigger code).
Raymond Chen describes the "correct" way to do this at his blog:
https://devblogs.microsoft.com/oldnewthing/20100412-00/?p=14353
Fiddling with the task bar window explicitly is not recommended behaviour.
Here's the latest unbroken link to Raymond Chen answer.
Since MSDN/Microsoft keeps breaking links I'll paste below for posterity:
For some reason, people think too hard. If you want to create a fullscreen window that covers the taskbar, just create a fullscreen window and the taskbar will automatically get out of the way. Don't go around hunting for the taskbar and poking it; let it do its thing.
As always, start with the scratch program and add the following:
HWND CreateFullscreenWindow(HWND hwnd)
{
HMONITOR hmon = MonitorFromWindow(hwnd,
MONITOR_DEFAULTTONEAREST);
MONITORINFO mi = { sizeof(mi) };
if (!GetMonitorInfo(hmon, &mi)) return NULL;
return CreateWindow(TEXT("static"),
TEXT("something interesting might go here"),
WS_POPUP | WS_VISIBLE,
mi.rcMonitor.left,
mi.rcMonitor.top,
mi.rcMonitor.right - mi.rcMonitor.left,
mi.rcMonitor.bottom - mi.rcMonitor.top,
hwnd, NULL, g_hinst, 0);
}
void OnChar(HWND hwnd, TCHAR ch, int cRepeat)
{
if (ch == TEXT(' ')) {
CreateFullscreenWindow(hwnd);
}
}
HANDLE_MSG(hwnd, WM_CHAR, OnChar);
Note that this sample program doesn't worry about destroying that fullscreen window or preventing the user from creating more than one. It's just a sample. The point is seeing how the CreateFullScreenWindow function is written.
We use the MonitorFromWindow function to figure out which monitor we should go fullscreen to. Note that in a multiple monitor system, this might not be the same monitor that the taskbar is on. Fortunately, we don't have to worry about that; the taskbar figures it out.
I've seen people hunt for the taskbar window and then do a ShowWindow(hwndTaskbar, SW_HIDE) on it. This is nuts for many reasons.
First is a mental exercise you should always use when evaluating tricks like this: "What if two programs tried this trick?" Now you have two programs both of which think they are in charge of hiding and showing the taskbar, neither of which is coordinating with the other. The result is a mess. One program hides the taskbar, then the other does, then the first decides it's finished so it unhides the taskbar, but the second program wasn't finished yet and gets a visible taskbar when it thought it should be hidden. Things only go downhill from there.
Second, what if your program crashes before it gets a chance to unhide the taskbar? The taskbar is now permanently hidden and the user has to log off and back on to get their taskbar back. That's not very nice.
Third, what if there is no taskbar at all? It is common in Terminal Server scenarios to run programs by themselves without Explorer (archived). In this configuration, there is no Explorer, no taskbar. Or maybe you're running on a future version of Windows that doesn't have a taskbar, it having been replaced by some other mechanism. What will your program do now?
Don't do any of this messing with the taskbar. Just create your fullscreen window and let the taskbar do its thing automatically.
I believe the taskbar will get out of the way when its shell hook tells it about a "rude app", this might take a little while.
What if you start out with the window HWND_TOPMOST and make it not top most after 1 second?
Right click on the taskbar
choose Properties
uncheck the checkbox that says "Keep the taskbar on top of other windows".
The taskbar belongs to the user, It's up to them to care about having it take 1/2 second to auto-hide when you app goes full screen. If they want to change that behavior then they can change it.
If you are working in an embedded system, then you may have a legitimate reason to hide the taskbar. But in that case, there's no reason not to simply configure the taskbar to not always be on top. You could also have a look at SystemParametersInfo if you want to change some of these settings in your code.