Re: Get Screen resolution - C / C++ / MFC Discussion Boards

Get Screen resolution

John Kohn29-May-03 6:55

John Kohn

29-May-03 6:55

Is there a Win32 function that retrieves the Computers screen resolution?

Thanks

Re: Get Screen resolution

Dominik Reichl29-May-03 7:00

Dominik Reichl

29-May-03 7:00

I use this piece of code:

HDC hDC = GetDC(NULL);
if(hDC == NULL) return(FALSE);

int nHorzRes = GetDeviceCaps(hDC, HORZRES);
int nVertRes = GetDeviceCaps(hDC, VERTRES);
int nBPP = GetDeviceCaps(hDC, BITSPIXEL) * GetDeviceCaps(hDC, PLANES);

nHorzRes is the screen width (for example 1024), nVertRes the screen height (for example 768), and nBPP the color bits per pixel (8 bit = 256 colors, 16 bit = high color, 24/32 bit = true color).

Beer | [beer]

-Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??

Re: Get Screen resolution

Hesham Amin29-May-03 21:19

Hesham Amin

29-May-03 21:19

Great !!
but how can I get my app. notified when the user changes the resolution?

Re: Get Screen resolution

Dominik Reichl29-May-03 22:16

Dominik Reichl

29-May-03 22:16

I don't know of any callback function that notifies you when the screen resolution changes, but why not saving the current resolution (x, y, bpp) and checking in an infinite loop if it changes? (Perhaps with a Sleep delay of 1 sec and in a thread)...

-Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??

Re: Get Screen resolution

basementman30-May-03 9:58

basementman

30-May-03 9:58

I believe that the system broadcasts a WM_SETTINGCHANGE message to all top level windows when the screen resolution has changed. So, in your main top-level window, simply add a handler for this message.

Re: Get Screen resolution

sps-itsec4629-May-03 7:32

sps-itsec46

29-May-03 7:32

Another approach is the following:

<br />
// Get screen resolution<br />
int iScreenWidth  = ::GetSystemMetrics( SM_CXSCREEN );<br />
int iScreenHeight = ::GetSystemMetrics( SM_CYSCREEN );<br />

But I'm not sure if it's win32... Confused | :confused:

Re: Get Screen resolution

Dominik Reichl29-May-03 8:05

Dominik Reichl

29-May-03 8:05

It works without MFC yes.

MSDN says:

Width and height, in pixels, of the screen of the primary display monitor. These are the same values you obtain by calling GetDeviceCaps(hdcPrimaryMonitor, HORZRES/VERTRES).

So exactly the same as in my post above Big Grin | :-D

-Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??

Re: Get Screen resolution

Chambers <\I> <\B>3-Jul-03 8:10

Chambers <\I> <\B>

3-Jul-03 8:10

This method is good if you are using GDI for drawing (for consistency in using device context handles), however I prefer ::GetSystemMetrics for use with DirectX/OpenGL projects because I want to get away from GDI completely when using these technologies (its also the example given in the DX SDK documentation).

Application Icon to display in Windows status bar

rapace29-May-03 6:32

rapace

29-May-03 6:32

Here is my code...
How can I display my Icon to the toolbar?
Thanks
Patrick

~~~~~~~~~~~~~~~~~ SOURCE CODE ~~~~~~~~~~~~~~
int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
return -1;

if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP
| CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||
!m_wndToolBar.LoadToolBar(IDR_MAINFRAME)| !m_wndToolBar.LoadBitmap(IDR_MAINFRAME))
{
TRACE0("Failed to create toolbar\n");
return -1; // fail to create
}

if (!m_wndStatusBar.Create(this) ||
!m_wndStatusBar.SetIndicators(indicators,
sizeof(indicators)/sizeof(UINT)))
{
TRACE0("Failed to create status bar\n");
return -1; // fail to create
}

// TODO: Delete these three lines if you don't want the toolbar to be dockable
m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY);
EnableDocking(CBRS_ALIGN_ANY);
DockControlBar(&m_wndToolBar);

return 0;
}

Patrick

Re: Application Icon to display in Windows status bar

David Crow29-May-03 7:22

David Crow

29-May-03 7:22

Make up your mind, do you want your app's status bar, your app's toolbar, or Windows' taskbar?

Re: Application Icon to display in Windows status bar

rapace29-May-03 8:52

rapace

29-May-03 8:52

in the app's toolbar.

from explorer I want to see my application witn the icon of my project.

Thanks Confused | :confused:

Re: Application Icon to display in Windows status bar

rapace29-May-03 9:21

rapace

29-May-03 9:21

This solves the toolbar icon, but I also want to have it showing with explorer which currently shows an "MFC icon"

// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
SetIcon(m_hIcon, FALSE); // Set small icon

~~~~~~~
Halfway there. Hmmm | :|

Re: Application Icon to display in Windows status bar

David Crow29-May-03 9:24

David Crow

29-May-03 9:24

The icon is contained in your project's res folder. Replace the MFC .ico file with one of your own, recompile, and you're done.

Thread updating Dialog

Anonymous29-May-03 6:05

Anonymous

29-May-03 6:05

Hi,

I have a thread that needs to update a dialog.
When I use UpdateData(false) from the thread I will get an exception.

Any idea why ?

Thanks,

Shay

Re: Thread updating Dialog

basementman29-May-03 6:21

basementman

29-May-03 6:21

Ideas Why:
1) Not a UI Thread
2) Not the thread that owns the dialog

Possible Solutions:
1) shared memvar, updated by the thread and monitored by the dialog.
2) PostThreadMessage()

Re: Thread updating Dialog

valikac29-May-03 10:22

valikac

29-May-03 10:22

What kind of thread is it? If it is a worker thread, one solution is messages. Send a message to main frame and have it update the control.

Kuphryn

problem with classWizard

aguest29-May-03 5:55

aguest

29-May-03 5:55

hello
i have add a DIALOGBAR and i have add in SLIDER. i want to attach one variable to this
SLIDER but when i go to the ClassWizard and i choice classename:CMainFrame i can't find
the the obectID IDC_SLIDER1 but i find it in the Classname :CAboutDlg.and i want to use
it in the calss CMainFrame.
and when i click on MessageMaps and choice class CMaiframe i can't add any variable??

Re: Question for the strong

MemLeak29-May-03 5:30

MemLeak

29-May-03 5:30

Hi,

I'm not sure of what you trying to explain here. You use somebody else app? If it's an app that you have created with the wizard then the first "dialogbar" that is created is not a "dialogbar" but it is a toolbar. You have the choice not to use it into your app in the MFC wizard.

Everything's beautiful if you look at it long enough...

Dll Function Extractor

Mark Sanders29-May-03 5:26

Mark Sanders

29-May-03 5:26

I have been given a VC++ 6 dll which has no documentation and no code. I need to find out what functions are available in this dll. Does anyone know of a utility somewhere that can show you the public functions of a dll?

Something similar to Lutz Roeder's .NET Reflector[^], but for a VC++ 6 dll.

Thanks,
Mark Sanders

Re: Dll Function Extractor

Rick York29-May-03 5:59

Rick York

29-May-03 5:59

dumpbin /EXPORTS will do it.

The Ten Commandments For C Programmers

Re: Dll Function Extractor

basementman29-May-03 6:22

basementman

29-May-03 6:22

or the Dependency Walker tool that comes with VC 6

Activex

Anonymous29-May-03 5:18

Anonymous

29-May-03 5:18

How would I force an Edit box or MSFlexgrid Cell/ Cells to be in currency format in VC ++ ?

Re: Activex

David Crow29-May-03 7:24

David Crow

29-May-03 7:24

A formatted edit control is something you'd have to create, or use one of the many available here at CP.

Preventing an external app from closing

EdwaM29-May-03 5:05

EdwaM

29-May-03 5:05

Hi,

I am trying to create a program that will prevent a user from closing an external application (i.e. Word).
I am not sure what approach I can take as I have little control over this app.

Trying to hook and trap messages seems like a good idea but not all apps use WM_CLOSE and by the time they receive WM_DESTROY it is too late.

If anyone has seen this done or have any idea of how it can be done please let me know.

How to load RTF file with pictures in CRichEdit?

Yasen Georgiew29-May-03 4:37

Yasen Georgiew

29-May-03 4:37

Hi,

Can anybody help me with my problem?
How to load RTF file with pictures in CRichEditCtrl?

I know how to insert picture (BMP) file in my CRichEditCtrl.
I also know how to save the contents of the CRichEditCtrl as RTF file.

I need to load a RTF file with pictures (BMP) in it, in my CRicheEdit control,
but I don't know how to do that.

Can you help me?

Thanks!
Yasen

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