C / C++ / MFC

toxcct18-Sep-06 3:34

toxcct

18-Sep-06 3:34

actually, it does use a semaphore/mutex, which name must be unique.
see this[^] class to understand what it actaully does.

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

_AnsHUMAN_ 18-Sep-06 3:37

_AnsHUMAN_

18-Sep-06 3:37

Programm3r wrote:
app sees that another instance is running (of itself)

So do you want to keep the second instance also running?
Or kill the second instance and bring the focus on the first instance that was already running?

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Programm3r18-Sep-06 3:46

Programm3r

18-Sep-06 3:46

Thanx for the reply...

"....Or kill the second instance and bring the focus on the first instance that was already running? ...."

Yes, I want to send a return code to the calling app (2nd opened application) so that it will see that another instance is already running, kill itself and cause the 1st instance to restore it's window.

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r

_AnsHUMAN_ 18-Sep-06 3:52

_AnsHUMAN_

18-Sep-06 3:52

There could be various solutions to this problem.
Preferrably using mutex's .
something like
HANDLE hMutex;
hMutex = CreateMutex(
NULL, // no security attributes
FALSE, // initially not owned
"SomeUniqueName"); // name of mutex
If this exists already return from the application.

Another option would be to use a shared variable and check for its value. Increment it each time an instance is created. If the value is greater than one you can just return from the second instance.

The third option would be to use the FindWindow function. You would get the handle to the window if it's already running.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

toxcct18-Sep-06 3:58

toxcct

18-Sep-06 3:58

CSingleInstance[^] does the job good Wink | ;)

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

_AnsHUMAN_ 18-Sep-06 4:01

_AnsHUMAN_

18-Sep-06 4:01

Thanks buddy. Will try and go through this article tomorrow. Roll eyes | :rolleyes:

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Confused with the resource using

Programm3r18-Sep-06 4:05

Programm3r

18-Sep-06 4:05

Thanx for the help... I'll try it Smile | :)

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r

bloodwinner18-Sep-06 2:50

bloodwinner

18-Sep-06 2:50

I am using VC++6.0 and trying to run a demo project about the dialog resources using from <<windows programming="">>.

I copyed its .cpp file, resource.h file into my project, and pasted its .rc file into my .rc file using notepad and add into the project also. But it didn't work,and pop out these errors:

--------------------Configuration: mymenu - Win32 Debug--------------------
Compiling...
mymenu.cpp
E:\work\project\mymenu\mymenu.cpp(20) : error C2065: 'IDC_BLACK' : undeclared identifier
E:\work\project\mymenu\mymenu.cpp(22) : error C2065: 'IDC_RECT' : undeclared identifier
E:\work\project\mymenu\mymenu.cpp(195) : error C2065: 'IDM_APP_ABOUT' : undeclared identifier
E:\work\project\mymenu\mymenu.cpp(195) : error C2051: case expression not constant
E:\work\project\mymenu\mymenu.cpp(203) : warning C4060: switch statement contains no 'case' or 'default' labels
E:\work\project\mymenu\mymenu.cpp(257) : error C2065: 'IDC_WHITE' : undeclared identifier
E:\work\project\mymenu\mymenu.cpp(259) : error C2065: 'IDC_ELLIPSE' : undeclared identifier
E:\work\project\mymenu\mymenu.cpp(263) : error C2065: 'IDC_PAINT' : undeclared identifier
E:\work\project\mymenu\mymenu.cpp(299) : error C2051: case expression not constant
E:\work\project\mymenu\mymenu.cpp(301) : error C2065: 'IDC_RED' : undeclared identifier
E:\work\project\mymenu\mymenu.cpp(301) : error C2051: case expression not constant
E:\work\project\mymenu\mymenu.cpp(303) : error C2065: 'IDC_GREEN' : undeclared identifier
E:\work\project\mymenu\mymenu.cpp(303) : error C2051: case expression not constant
E:\work\project\mymenu\mymenu.cpp(305) : error C2065: 'IDC_YELLOW' : undeclared identifier
E:\work\project\mymenu\mymenu.cpp(305) : error C2051: case expression not constant
E:\work\project\mymenu\mymenu.cpp(307) : error C2065: 'IDC_BLUE' : undeclared identifier
E:\work\project\mymenu\mymenu.cpp(307) : error C2051: case expression not constant
E:\work\project\mymenu\mymenu.cpp(309) : error C2065: 'IDC_MAGENTA' : undeclared identifier
E:\work\project\mymenu\mymenu.cpp(309) : error C2051: case expression not constant
E:\work\project\mymenu\mymenu.cpp(311) : error C2065: 'IDC_CYAN' : undeclared identifier
E:\work\project\mymenu\mymenu.cpp(311) : error C2051: case expression not constant
E:\work\project\mymenu\mymenu.cpp(313) : error C2051: case expression not constant
E:\work\project\mymenu\mymenu.cpp(325) : error C2051: case expression not constant
E:\work\project\mymenu\mymenu.cpp(327) : error C2051: case expression not constant
Error executing cl.exe.

mymenu.exe - 23 error(s), 1 warning(s)

Hamid_RT18-Sep-06 3:10

18-Sep-06 3:10

"undeclared identifier" it seems you need to include a header file to mymenu.cppdid you include this file? Smile | :)

WhiteSky

bloodwinner18-Sep-06 3:13

bloodwinner

18-Sep-06 3:13

yes, as you can see in .cpp file, I had

#include <windows.h>
#include "resource.h"

toxcct18-Sep-06 3:24

toxcct

18-Sep-06 3:24

check the Ignore HTML tags in this message (good for code snippets) check box Frown | :(

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Hamid_RT18-Sep-06 3:31

Drawing radio buttons - text positioning

18-Sep-06 3:31

sure you include but i cant see header file in previous your thread i saw only #include:) anyway these erros are only a thing a include Smile | :)

WhiteSky

achimschoen18-Sep-06 2:43

achimschoen

18-Sep-06 2:43

Hello everybody,

I've figured out that windows supplies an smart way to draw cutom elements via DrawFrameControl.

When drawing a radio button or a checkbox the question is where to place the text exactly. Of course it is no problem to figure out the settings for the standard settings (MS Sans Serif 8), but I wonder the windows internal logic for other fonts and sizes. I've used a lot of time to consider all values of GetTextMetrics, but I was not success full.

Has anybody found a rule where the text is placed exactly depending on font and font size?

Re: Drawing radio buttons - text positioning

Hamid_RT18-Sep-06 3:13

Re: Drawing radio buttons - text positioning

18-Sep-06 3:13

now whats your problem? Smile | :)

WhiteSky

achimschoen18-Sep-06 3:37

achimschoen

18-Sep-06 3:37

Maybe the easisiest ways is to use some code to show my problem on drawing the radio button.

PaintRadioButton(CDC* pDC, const CRect& rcPos, const CFont& font, const CString& strText)<br />
{<br />
 // draw radio button background<br />
 DWORD dwBackground = GetSysColor(COLOR_BTNFACE);<br />
 CBrush brushBk(dwBackground);<br />
 pDC->FillRect(rcRadioButton, &brushBk);<br />
<br />
 // draw radio button circle<br />
 CRect rcCircle;<br />
 CalcCircleRect(rcPos, rcCirlce);<br />
 pDC->DrawFrameControl(rcCircle, DFC_BUTTON, DFCS_BUTTONRADIO);<br />
<br />
 // draw radio button text<br />
 CalcTextRect(rcPos, rcText, font, strText);<br />
 pDC->DrawText(strText, rcText, DT_LEFT|DT_VCENTER|DT_SINGLELINE);<br />
<br />
}

CalcCircleRect(const CRect& rcPos, CRect& rcCirlce) is easy to implement, just center the box vertically and make an offset of 1 in the horicontal position. The size could be received through GetSystemMetrics(SM_CXMENUCHECK);

CalcTextRect(const CRect& rcPos, CRect& rcTextPos, cont CFont& font, const CString& strText) Is the thing what is missing. Do you know some magic formula how to calculate the exact position for the text depending on font, font size and text content so it looks exactly like the radio button controls?

Yahoo's sign-in seal technology

George_George18-Sep-06 2:29

George_George

18-Sep-06 2:29

Hello everyone,

Yahoo is using a technology called sign-in seal to protect password stolen. Check,

[url]http://mail.yahoo.com[/url]

[url]http://help.yahoo.com/l/us/yahoo/edit/privacy/edit-39.html[/url]

Does any one know what it is and whether there are any documents/SDK supporting that feature? I have Googled, but only can find advertisements ...

thanks in advance,
George

IOCTL

Pratheep Kenny18-Sep-06 2:12

Pratheep Kenny

18-Sep-06 2:12

Hi All,

Can someone suggest a good site to study about IOCTL's From start.
I also have another doubt. Are IOCTL's predefined by VC++ or user defined.
I need a clear understanding of this. Plz Someone help me.

Thanks and Regards in Advance
Kenny

Re: IOCTL

James R. Twine19-Sep-06 4:50

James R. Twine

19-Sep-06 4:50

   I would suggest Googling for device driver development under Win32.

   I also believe that you can define your own IOCTLs in your own driver.

   Peace!

-=- James

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Setting Color for The button control

Pratheep Kenny18-Sep-06 2:08

Pratheep Kenny

18-Sep-06 2:08

Hi all,

Can Someone tell me How to set the color for button control, both at design time and runtime?

Thanks and Regards in Advance
Kenny

Re: Setting Color for The button control

Rinu_Raj18-Sep-06 2:16

Rinu_Raj

18-Sep-06 2:16

Derive a class from CButon

Class ButonEx: public CButton
{
------
------
}

override the DrawItem(....)
void ButonEx::DrawItem( LPDRAWITEMSTRUCT lpDIS_i )
{
CDC DCItem;
DCItem.Attach( lpDIS_i->hDC );
// Use this DCItem to select different objects ...also set text color and all

}

Rinu Raj

Re: Setting Color for The button control

Hamid_RT18-Sep-06 2:28