C / C++ / MFC

Roman Fadeyev15-Aug-02 6:42

15-Aug-02 6:42

1. Override the views WM_ERASEBKGND message and paint with a black brush and then return TRUE
If you will use WM_ERASEBKGND, it can result to a blinking whilst Window resizing. It is better way to change background brush in WindowClass properties.

Tomasz Sowinski15-Aug-02 7:22

15-Aug-02 7:22

Roman Fadeyev wrote:
If you will use WM_ERASEBKGND, it can result to a blinking whilst Window resizing.

No, if you handle WM_ERASEBKGND yourselft, the window class brush is not used.

Tomasz Sowinski -- http://www.shooltz.com

Never argue with an idiot, he'll bring you to his level and beat you with experience.

Roman Fadeyev15-Aug-02 8:02

15-Aug-02 8:02

Tomasz Sowinski wrote:
No, if you handle WM_ERASEBKGND yourselft, the window class brush is not used.

I beg pardon, I was mistaken

I tested example below, all OK. Hmmmm, strangely...

//Example of black window
BOOL CTestView::OnEraseBkgnd(CDC* pDC)
{
	CRect rect;
	pDC->GetClipBox(&rect);     // Erase the area needed
	pDC->PatBlt(rect.left, rect.top, rect.Width(), rect.Height(),
		BLACKNESS);
	return true;
}

Tomasz Sowinski15-Aug-02 8:07

15-Aug-02 8:07

As long as you don't go into ::DefWindowProc, the class brush remains unused. And it doesn't matter what you're returning from OnEraseBkgnd.

Tomasz Sowinski -- http://www.shooltz.com

Never argue with an idiot, he'll bring you to his level and beat you with experience.

Zayax15-Aug-02 14:22

Zayax

15-Aug-02 14:22

Thank you very much guys. The black screen work just fine Smile | :)

Newbies

Trouble Selecting Externaly with List Control.

Zayax15-Aug-02 14:44

Zayax

15-Aug-02 14:44

Roger Allen wrote:
Take a look at the MSDN for SetViewPortExt() and go from there.

From what what I've read, if I want to be able to scale, I have to use SetWindowExtent and SetViewportExtent functions. But when using the SetWindowExtent and SetViewportExtent, only two mapping modes are allowed : MM_ISOTROPIC and MM_ANISOTROPIC. The best part was both mapping mode have y going downward. I've tried using negative values in my y axis coordinate input so that my line will be drawn upward but I can't find my line anywhere.
Anyone has any idea? Confused | :confused:

Newbies

Jawache15-Aug-02 5:44

Jawache

15-Aug-02 5:44

Whats the best method to select an Item in the list control. I can't seem to get it to work.

I've used SetSelectionMark and SetItemState both don't work. Theres some flickering but the items background colour does not change.

Am i missing something? is there another message I have to send?

Cheers

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Re: Trouble Selecting Externaly with List Control.

Tomasz Sowinski15-Aug-02 5:54

Re: Trouble Selecting Externaly with List Control.

15-Aug-02 5:54

list.SetItemState(itemIndex, LVIS_SELECTED | LVIS_FOCUSED, LVIS_SELECTED | LVIS_FOCUSED);

Tomasz Sowinski -- http://www.shooltz.com

Never argue with an idiot, he'll bring you to his level and beat you with experience.

Jawache15-Aug-02 7:21

Jawache

15-Aug-02 7:21

Excellent...
That worked a treat.

Thanks

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Re: Trouble Selecting Externaly with List Control.

Roger Allen15-Aug-02 6:36

Roger Allen

15-Aug-02 6:36

In addition to what Tomasz said:

You may also need to set the focus to the control to get he blue selection bar, or make sure that the "Show selection always" option is on in the resource editor.

Roger Allen
Sonork 100.10016

I think I need a new quote, I am on the prowl, so look out for a soft cute furry looking animal, which is really a Hippo in disguise. Its probably me.

Setting Environmental Varialbles

Michael_Petrov15-Aug-02 5:19

Michael_Petrov

15-Aug-02 5:19

How can I set environment variables automatically (e.g. using bat file) without going in Control Panel -> System Properties -> Environment and adding them manually?

Thanks,

Michael

C^hris L^osinger15-Aug-02 6:07

C^hris L^osinger

15-Aug-02 6:07

did you try ::SetEnvironmentVariable ?

-=c

"To announce that there must be no criticism of the president, or that we are to stand by the president right or wrong, is not only unpatriotic and servile, but is morally treasonable to the American public."
-- Theodore Roosevelt

image effects!

Roman Fadeyev15-Aug-02 6:57

15-Aug-02 6:57

I think, Michael wants to create constant environment variable, whereas ::SetEnvironmentVariable works only for the current process.

C^hris L^osinger15-Aug-02 6:57

C^hris L^osinger

15-Aug-02 6:57

if you say so... Smile | :)

image effects!

Roman Fadeyev15-Aug-02 6:55

15-Aug-02 6:55

MSDN says

HOWTO: Propagating Environment Variables to the System
ID: Q104011

The information in this article applies to:

SUMMARY
You can modify user environment variables by editing the following Registry key:
HKEY_CURRENT_USER \
Environment
You can modify system environment variables by editing the following Registry key:
HKEY_LOCAL_MACHINE \
SYSTEM \
CurrentControlSet \
Control \
Session Manager \
Environment

Note that any environment variable that needs to be expanded (for example, when you use %SYSTEM%) must be stored in the registry as a REG_EXPAND_SZ registry value. Any values of type REG_SZ will not be expanded when read from the registry.
Note that RegEdit.exe does not have a way to add REG_EXPAND_SZ. Use RegEdt32.exe when editing these values manually.

However, note that modifications to the environment variables do not result in immediate change. For example, if you start another Command Prompt after making the changes, the environment variables will reflect the previous (not the current) values. The changes do not take effect until you log off and then log back on.

To effect these changes without having to log off, broadcast a WM_SETTINGCHANGE message to all windows in the system, so that any interested applications (such as Program Manager, Task Manager, Control Panel, and so forth) can perform an update.

MORE INFORMATION
For example, on Windows NT, the following code fragment should propagate the changes to the environment variables used in the Command Prompt:

SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0,
(LPARAM) "Environment", SMTO_ABORTIFHUNG,
5000, &dwReturnValue);

None of the applications that ship with Windows 95, including Program Manager and the shell, respond to this message. Thus, while this article can technically be implemented on Windows 95, there is no effect except to notify third-party applications. The only method of changing global environment variables on Windows 95 is to modify the autoexec.bat file and reboot.
Additional query words:

Keywords : kbNTOS350 kbNTOS351 kbNTOS400 kbSysSettings kbGrpUser
Issue type : kbhowto

Love MSDN and your life will get better Smile | :)

Tomasz Sowinski15-Aug-02 7:20

15-Aug-02 7:20

Roman Fadeyev wrote:
Love MSDN and your life will get better

It'll be at its best when you just provide KB article ID or link, without copying whole article into the message board.

Tomasz Sowinski -- http://www.shooltz.com

Never argue with an idiot, he'll bring you to his level and beat you with experience.

Roman Fadeyev15-Aug-02 8:07

15-Aug-02 8:07

Tomasz Sowinski wrote:
It'll be at its best when you just provide KB article ID or link, without copying whole article into the message board.

laziness is engine of progress Smile | :)

by the way, Not such this article big! Smile | :)

DateTimeCtrl and BkColor

Idefix15-Aug-02 5:05

Idefix

15-Aug-02 5:05

how can I change the background color of a datetimectrl?
I don't talk about the MonthCalCtrl that's quite easy (MCM_SETCOLOR).I tried to override the function OnCtlColor(EditCtrl...) but it don't work. I also tried it by the wm_paint message itself no chance.

Has someone an idea and can help me?

List control window

Shay Harel15-Aug-02 4:24

Shay Harel

15-Aug-02 4:24

Hi !

I am trying to use a list control inside a window, not a dialog, so I can resize it. I tried to create a class the inherit from CListCtrl and on it's instance to use the Create function:

CErrReport::CErrReport(CWnd *pParent)<br />
{<br />
	Create (WS_OVERLAPPEDWINDOW|WS_HSCROLL|WS_VSCROLL,CRect       (20,30,200,300),pParent,1);<br />
	<br />
}

On the paret window I used :

CErrReport *perr=new CErrReport (this);<br />
perr->ShowWindow (SW_SHOWNORMAL);

But the problem is that when the window starts I can't even click on it or move it or close it, nothing.....

What am I doing wrong ?????????????????///
Please help me

Thank you Frown | :(

Alberto Giannetto15-Aug-02 4:29

Alberto Giannetto

15-Aug-02 4:29

Why not use resizable dialogs?

Alberto

Anonymous15-Aug-02 4:37

Anonymous

15-Aug-02 4:37

If I use a resizable dialog, then the dialog itself is resized but the control size is fixed, no ?

If I create a dialog based application, and I click on the maximize button, all the control remian in the original size they were created, is there a way to expand them to the size of the whole dialog frame ?

Thank you

Shay

Alberto Giannetto15-Aug-02 4:44

Alberto Giannetto

15-Aug-02 4:44

Anonymous wrote:
If I use a resizable dialog, then the dialog itself is resized but the control size is fixed, no ?

If I create a dialog based application, and I click on the maximize button, all the control remian in the original size they were created, is there a way to expand them to the size of the whole dialog frame ?

You should be able to intercept the WM_SIZE and then, for each control in the window, call SetWindowPos or something like that. The WM_SIZE gets called with the new size as parameters, so you can redraw your controls or child window accordingly.

Albi

Steen Krogsgaard15-Aug-02 4:35

Steen Krogsgaard

15-Aug-02 4:35

Shouldn't it be created using the WS_CHILD style? All the controls are supposted to be child windows. Just an idea.

Cheers
Steen.

"To claim that computer games influence children is ridiculous. If Pacman had influenced children born in the 80'ies we would see a lot of youngsters running around in dark rooms eating pills while listening to monotonous music"

Shay Harel15-Aug-02 4:43

Shay Harel

15-Aug-02 4:43

Well, I tried to OR inot the style WS_CHILD and it did not help....
Thank you...