Determining If A Monitor Is Off

Determining If A Monitor Is Off: "AnswerDetermining If A Monitor Is Off

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Wednesday, July 18, 2007 5:03 PMstack Users MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals

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I've found code that will turn a monitor on and off:

Code Snippet

#include

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
// Eliminate user's interaction for 500 ms
Sleep(500);

// Turn off monitor
SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, (LPARAM) 2);

// Turn on monitor
// SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, (LPARAM) -1);

// Low power monitor
// SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, (LPARAM) 1);

return 0;
}

Now I am looking for code that will tell me if a monitor is on or off. Anyone have any examples?
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Thursday, July 19, 2007 8:10 AMBruno van Dooren Users MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals
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I don't know. Try asking in the appropriate platform SDK nntp newsgroup

http://www.microsoft.com/communities/newsgroups/list/en-us/default.aspx



Even if you can query the monitor state, this won't tell you if the monitor itself is powered on.

At home I still use a 19' iyama crt. Windows doesn't know when I press the monitor power button.

Btw: have you tried google or www.codeproject.com ?
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Thursday, July 19, 2007 8:10 AMBruno van Dooren Users MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals
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I don't know. Try asking in the appropriate platform SDK nntp newsgroup

http://www.microsoft.com/communities/newsgroups/list/en-us/default.aspx



Even if you can query the monitor state, this won't tell you if the monitor itself is powered on.

At home I still use a 19' iyama crt. Windows doesn't know when I press the monitor power button.

Btw: have you tried google or www.codeproject.com ?
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– Enviado usando a Barra de Ferramentas Google"

How to detect if monitor was on or off with C#

How to detect if monitor was on or off with C#: "AnswerHow to detect if monitor was on or off with C#

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Monday, June 01, 2009 8:48 AMRiteru Users MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals

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I'm trying to write a software to detect the status of monitor (or perhap HD LCD television screen) in order to create a report about the availability of the output screen.

- I've tried to use WMI (Win32_DesktopMonitor ) to check availability but it alway return 3 which mean On, no matter my computer LCD screen is On or Off;

Anyone have any idea on detecting the monitor status?

PS. The LCD screen i'm using connected to my PC via DVI port, I'm not sure yet which port will be used in the real run (DVI, Serial , etc) so I'm trying to find a solution that can support all this port.
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Tuesday, June 02, 2009 12:32 PMJagadeesan Kandasamy Users MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals
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I hope this might be helpful...

Try to use with GetDesktopWindow(), The below code is just to switch on / off the moniter, from this you can try to the status as well.

[DllImport(

'user32.dll')]

static



extern IntPtr SendMessage(IntPtr hWnd, uint Msg,



IntPtr wParam, IntPtr lParam);

//Or

[DllImport(

'user32.dll', SetLastError = true)]

static



extern bool PostMessage(IntPtr hWnd, uint Msg,



IntPtr wParam, IntPtr lParam);

//Or

[DllImport(

'user32.dll')]

static



extern bool PostThreadMessage(uint idThread, uint Msg,



UIntPtr wParam, IntPtr lParam);

//Or

[DllImport(

'user32.dll', SetLastError=true, CharSet=CharSet.Auto)]

static



extern bool SendMessageCallback(IntPtr hWnd, uint Msg,



UIntPtr wParam, IntPtr lParam,

SendMessageDelegate lpCallBack,

UIntPtr dwData);

//Or

[DllImport(

'user32.dll', SetLastError=true, CharSet=CharSet.Auto)]

static



extern bool SendNotifyMessage(IntPtr hWnd, uint Msg,



UIntPtr wParam, IntPtr lParam);

//Or

[DllImport(

'user32.dll')]

private



static extern IntPtr GetDesktopWindow();

//Or

[DllImport(

'user32.dll', SetLastError = true)]

static



extern IntPtr FindWindow(string lpClassName, string lpWindowName);

//Or

[DllImport(

'user32.dll', SetLastError = true)]

static



extern IntPtr FindWindowEx(IntPtr hwndParent,



IntPtr hwndChildAfter, string lpszClass, string lpszWindow);





const



int SC_MONITORPOWER = 0xF170;

const



int WM_SYSCOMMAND = 0x0112;

const



int MONITORON = -1;

const



int MONITOROFF = 2;

const



int MONITORSTANBY = 1;

int



HWND_BROADCAST = 0xffff; //the message is sent to all top-level windows in the system

int



HWND_TOPMOST = -1;

int



HWND_TOP = 0; //

int



HWND_BOTTOM = 1; //limited use

int



HWND_NOTOPMOST = -2; //

Form frm =

new Form();

Frm.Handle();

SendMessage(ValidHWND, WM_SYSCOMMAND, SC_MONITORPOWER, MONITOROFF );

SendMessage(ValidHWND, WM_SYSCOMMAND, SC_MONITORPOWER, MONITORON);
Regards, Jagadeesan
o Marked As Answer byBin-ze ZhaoMicrosoft, ModeratorFriday, June 05, 2009 2:04 AM
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Tuesday, June 02, 2009 12:32 PMJagadeesan Kandasamy Users MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals
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I hope this might be helpful...

Try to use with GetDesktopWindow(), The below code is just to switch on / off the moniter, from this you can try to the status as well.

[DllImport(

'user32.dll')]

static



extern IntPtr SendMessage(IntPtr hWnd, uint Msg,



IntPtr wParam, IntPtr lParam);

//Or

[DllImport(

'user32.dll', SetLastError = true)]

static



extern bool PostMessage(IntPtr hWnd, uint Msg,



IntPtr wParam, IntPtr lParam);

//Or

[DllImport(

'user32.dll')]

static



extern bool PostThreadMessage(uint idThread, uint Msg,



UIntPtr wParam, IntPtr lParam);

//Or

[DllImport(

'user32.dll', SetLastError=true, CharSet=CharSet.Auto)]

static



extern bool SendMessageCallback(IntPtr hWnd, uint Msg,



UIntPtr wParam, IntPtr lParam,

SendMessageDelegate lpCallBack,

UIntPtr dwData);

//Or

[DllImport(

'user32.dll', SetLastError=true, CharSet=CharSet.Auto)]

static



extern bool SendNotifyMessage(IntPtr hWnd, uint Msg,



UIntPtr wParam, IntPtr lParam);

//Or

[DllImport(

'user32.dll')]

private



static extern IntPtr GetDesktopWindow();

//Or

[DllImport(

'user32.dll', SetLastError = true)]

static



extern IntPtr FindWindow(string lpClassName, string lpWindowName);

//Or

[DllImport(

'user32.dll', SetLastError = true)]

static



extern IntPtr FindWindowEx(IntPtr hwndParent,



IntPtr hwndChildAfter, string lpszClass, string lpszWindow);





const



int SC_MONITORPOWER = 0xF170;

const



int WM_SYSCOMMAND = 0x0112;

const



int MONITORON = -1;

const



int MONITOROFF = 2;

const



int MONITORSTANBY = 1;

int



HWND_BROADCAST = 0xffff; //the message is sent to all top-level windows in the system

int



HWND_TOPMOST = -1;

int



HWND_TOP = 0; //

int



HWND_BOTTOM = 1; //limited use

int



HWND_NOTOPMOST = -2; //

Form frm =

new Form();

Frm.Handle();

SendMessage(ValidHWND, WM_SYSCOMMAND, SC_MONITORPOWER, MONITOROFF );

SendMessage(ValidHWND, WM_SYSCOMMAND, SC_MONITORPOWER, MONITORON);
Regards, Jagadeesan
o Marked As Answer byBin-ze ZhaoMicrosoft, ModeratorFriday, June 05, 2009 2:04 AM
o

– Enviado usando a Barra de Ferramentas Google"

SC_MONITORPOWER in Windows 7?

SC_MONITORPOWER in Windows 7?: "SC_MONITORPOWER in Windows 7?

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Wednesday, January 13, 2010 1:46 PMRodTech Users MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals

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Hi, I have developed a program which turns off the monitor by sending message :

SendMessage(-1, WM_SYSCOMMAND, SC_MONITORPOWER, 2)

The problem is that is not working in Windows 7. Does anybody know if WM_SYSCOMMAND and SC_MONITORPOWER are still supported in Win7?
In case is not, what are the replacemente for this actions? thanks in advance
Rod
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Sunday, February 28, 2010 6:31 PMRaymond Rogers Users MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals

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I'm seeing the same problem with my application. Have you found a solution for this yet?
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Friday, June 11, 2010 5:30 PMRomashka_Sky Users MedalsUsers MedalsUsers MedalsUsers MedalsUsers Medals

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SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, 2);
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– Enviado usando a Barra de Ferramentas Google"

Visual Basic :: Turn Monitor Off Or Place It On Standby...

Visual Basic :: Turn Monitor Off Or Place It On Standby...: "Turn Monitor Off Or Place It On Standby...

I have found this code splattered all over VBF, or code similar, which I have modified...

VB Code:
Option Explicit Private Declare Function SendMessage Lib 'user32' Alias 'SendMessageA' (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Integer, ByVal lParam As Any) As Long Private Const WM_SYSCOMMAND = &H112Private Const SC_MONITORPOWER = &HF170 Private Sub cmdTurnOFF_Click() Debug.Print SendMessage(Form1.hwnd, WM_SYSCOMMAND, SC_MONITORPOWER, 2&)End Sub Private Sub cmdStandby_Click() Debug.Print SendMessage(Form1.hwnd, WM_SYSCOMMAND, SC_MONITORPOWER, 1&)End Sub Private Sub cmdTurnON_Click() Debug.Print SendMessage(Form1.hwnd, WM_SYSCOMMAND, SC_MONITORPOWER, -1&)End Sub

But it doesn't work...I alwasy get a 0 returned from the SendMessage and the monitor does absolutely nowt

Anyone got any ideas?

Woka

– Enviado usando a Barra de Ferramentas Google"

16 bit in Windows 7 with XP mode

16 bit in Windows 7 with XP mode


Assuming you can run the program on Windows XP, you might be able to run it. If you meet the hardware requirements you can go ahead and try it out. See the following link for the requirements and other information about Windows XP mode:
http://www.microsoft.com/windows/virtual-pc/get-started.aspx

Ubuntu Bloke: HOWTO: VirtualBox 3.2 "headless" on Lucid Lynx

Ubuntu Bloke: HOWTO: VirtualBox 3.2 "headless" on Lucid Lynx: "HOWTO: VirtualBox 3.2 'headless' on

HOWTO: VirtualBox 3.2 "headless" on Lucid Lynx

As of karmic koala, Vbox 3.x is provided via the standard Ubuntu repositories. Unfortunately, this is the OSE version and it does not appear to work headless.

So, we have to download the "free as in beer" version from the Oracle website, which is currently here

At the time of writing the current build for Lucid is virtualbox-3.2_3.2.4-62467~Ubuntu~lucid_i386.deb

Before we can install the deb, we will also need to install some dependencies.

sudo apt-get install libcurl3 dkms libqt4-network libqtgui4 libxslt1.1 libasound2 \
libdirectfb-1.2-0 libgl1-mesa-dri libgl1-mesa-glx libqt4-opengl libsdl1.2debian \
libsdl1.2debian-alsa libsysfs2 libts-0.0-0 libxcursor1 linux-headers-`uname -r` \
libxdamage1 libxfixes3 libxmu6 libxxf86vm1 tsconf

Now we can install the virtualbox deb that we downloaded earlier.

sudo dpkg -i virtualbox-3.2_3.2.4-62467~Ubuntu~lucid_i386.deb

Next, add your user account to the vboxusers group

sudo adduser brettg vboxusers

Virtualbox machines that you create will by default go in your home directory

/home/brettg/.VirtualBox/

Ensure vboxusers have appropriate permissions to the kernel, create the file;

sudo vi /etc/udev/rules.d/40-permissions.rules

/etc/udev/rules.d/40-permissions.rules

KERNEL=="vboxdrv", GROUP="vboxusers", MODE="0660"

That's it, Virtualbox should be installed and ready to go.
Now we can move on to creating a virtual machine
Create a machine named "io"

VBoxManage createvm -name io --ostype Ubuntu -register

Configure it with a nic bridged to eth0, 256Mb RAM, enable acpi and set to boot from DVD

VBoxManage modifyvm io --memory 256 --pae on --acpi on --boot1 dvd --nic1 bridged --bridgeadapter1 eth0

Create a virtual IDE controller

VBoxManage storagectl io --name IDE0 --add ide

Create a virtual HDD

VBoxManage createvdi -filename ~/.VirtualBox/Machines/io/sda.vdi -size 48000 -register

Attach the virtual HDD

VBoxManage storageattach io --storagectl IDE0 --port 0 --device 0 --type hdd --medium ~/.VirtualBox/Machines/io/sda.vdi

Create and attach a virtual DVD drive to the controller and insert the DVD image

VBoxManage storageattach io --storagectl IDE0 --port 1 --device 0 --type dvddrive --medium /store/archive/ISO/ubuntu-10.04-server-i386.iso

The default vrdp port for machines is 3389, however, if you intend to run more than one guest then each one will need to listen on a different port. I use the 3xxx range with the xxx being the last octet of the machines IP address. For example, 192.168.0.1 would be 3001.

VBoxManage modifyvm io --vrdpport 3001

And thats it, your machine has been created. Time to start it up and give it a test drive!

Using the virtual machine

Start the machine

nohup VBoxHeadless -startvm io &

On a GUI workstation, establish a remote desktop connection to the machine. In my case, the host server is called "jupiter" so I type;

rdesktop -a 8 jupiter:3001

After you have installed the OS, you need to tell the machine to boot from the hdd.

VBoxManage modifyvm io --boot1 disk

You can also deregister the dvd image if you don't intend to use it again.

VBoxManage unregisterimage dvd /store/archive/ISO/ubuntu-10.04-server-i386.iso

Here are some other useful commands;

VBoxManage showvminfo io
VBoxManage list hdds
VBoxManage list runningvms
VBoxManage controlvm io poweroff
VBoxManage unregistervm io --delete
VBoxManage controlvm io savestate
VBoxManage closemedium disk UUID
VBoxManage modifyhd UUID --type immutable

[ubuntu] Virtualbox: Save Windows XP guest screen resolution - Ubuntu Forums

[ubuntu] Virtualbox: Save Windows XP guest screen resolution - Ubuntu Forums: "Virtualbox: Save

Virtualbox: Save Windows XP guest screen resolution

---

I've got VirtualBox 1.6.2 installed on a Ubuntu 8.04 host. Running Windows XP SP3 in VM. I prefer to use a screen resolution of 1440x900x32 for my guest and can easily set this using:

VBoxManage controlvm [xpGuestName] setvideomodehint 1440 900 32

HOWEVER, I have to do this every time, as the default resolution of 1024x768 is how it starts at bootup. Is there any way to save the 1440x900 screen resolution properties so that my VBox WinXP guest will start that way every time?