C / C++ / MFC Discussion Boards

Re: How do i retrive %systemroot% path name?

Member 40481317-Jun-03 18:59

Member 404813

17-Jun-03 18:59

Thanks

cursor X and Y position

wickedclownz17-Jun-03 17:00

wickedclownz

17-Jun-03 17:00

I have windows XP and I cannot call BIOS to control the cursors X and Y position in text mode. Is there any other way I can conrol the X and Y without calling BIOS?

Re: cursor X and Y position

John M. Drescher17-Jun-03 17:45

John M. Drescher

17-Jun-03 17:45

You can either use ANSI or a console. Try the following link for an example of a console:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/using_the_high_level_input_and_output_functions.asp[^]

WYSIWYG Drawing

Anonymous17-Jun-03 16:55

Anonymous

17-Jun-03 16:55

Hi all, I need some help. I'm trying to draw to a device that does not really have a device. The resolution for this device is 204x196. An application that someone else did takes all the positions of the objects/texts and multiplies them by a factor. Unfortunatly, with this factor, I cannot get text to line up as I can on the screen and the printer. He is using a factor of 2.12, but this does not equate to one inch on the screen to one inch on the new device and to one inch on the printer. Actually, 2.18 equates to one inch. (This factor does create fonts in the correct position.)

What I was thinking was to do one of the following:

Use the SetWindowExt/SetViewportExt -- didn't work...
Create a expansion of one above that will allow perfact scaling then get the bit map and shrink it down.
Use the ScaleViewportExtEx and just magnify it up to the proper scale. I cannot seem to get this to work as advertised.

So, any help that you guys can give would be greatly appericated.

Thanks
Larry

Re: WYSIWYG Drawing

basementman18-Jun-03 4:41

basementman

18-Jun-03 4:41

Some thoughts would be to do one of the following:

Figure out why the ScaleViewportExt is not working.

Do double buffer drawing and simply do a StretchBlt rather than a BitBlt when drawing to your scaled device. This approach doesn't always look very good, though.

onwards and upwards...

Re: WYSIWYG Drawing

Larry J. Siddens18-Jun-03 8:56

Larry J. Siddens

18-Jun-03 8:56

How does the WindowExt & ViewportExt work? I know they have no effect on map modes like MM_LOENGLIDS/MM_HIENGLISH/MM_LOMETRIC/MM_HIMETRIC/MM_TWIPS/MM_TEXT. It only has an effect if you are using MM_ISOTROPIC and MM_ANISOTROPIC. By using these you can create a one-to-one relations ship with other units?

Like: The screen is usally 96dpi and I have a device that is 200dpi. I create a bitmap in 200dpi (lengthXwidth), then use these to create a conversion from the 96 -> 200?

Examle:

pDC->SetMapMode( MM_ISOTROPIC );
pDC->SetWindowExt( 96 * 8.5, 96 * 11 ); // or 120 if using large fonts
pDC->SetViewportExt( 200*8.5, 200*11 );

Rect( 96, 96, 192, 192 );
pDC->Rectangle( &Rect )

Would this create a 1" x 1" on the new bitmap?

Thanks
Larry

Sources files back up

Gagnon Claude17-Jun-03 16:46

Gagnon Claude

17-Jun-03 16:46

Hi,

I am programming with Visual C++ 6.0. My sources files are on an intranet network. Visual C++ is installed locally on my computer. I compile and link over the network.
I plan to put my sources files in my desktop computer and compile locally because I have remark that compiling true the network is slow.
I want to know wich method is using to back up sources files at the end of the day.

Bye,

Claude

Re: Sources files back up

John M. Drescher17-Jun-03 16:59

John M. Drescher

17-Jun-03 16:59

Gagnon Claude wrote:
the network is slow
I know what you mean. Even a 100 TX connection is slow during compiles. I think this is mainy because of permissions but I may be wrong...

I created a batch file to zip my source and copy it to the network folder.

John

Re: Sources files back up

basementman18-Jun-03 4:43

basementman

18-Jun-03 4:43

Source control would be the best solution.

onwards and upwards...

fix formview

sdfdsfa17-Jun-03 16:16

sdfdsfa

17-Jun-03 16:16

it is possible to fix the size of formview in mdi?

thanx in advance.

Shinya

what's the name of the control

gucy17-Jun-03 15:10

gucy

17-Jun-03 15:10

i believe that everyone have used mepg player.as we know,the player have several control panel,we can diplay some of them or not,we can seperate the panel from another,also when we move the panel near another,they will be connected automatically. now i want to realize that kind of control.
if anyone can tell me the name of the control or where can i find some source code?
thanks a lot!

gucy

How to change size of a control dynamically

chito17-Jun-03 15:04

chito

17-Jun-03 15:04

Hello,

How to change size of a activexcontrol (which is in a dialog) dynamically. How to enable autoscroll of a dialog if size of activexcontrol is bigger than size of dialog.

Thanks,
Chito.

CRichEditCtrl and SetOptions

Vancouver17-Jun-03 13:43

Vancouver

17-Jun-03 13:43

I define a rich edit box with horizontal and vertical scroll bar.
It works as it is supposed to; however, when I set the option ECO_SAVESEL with SetOption (no matter if OR or SET), the scroll bars don't come up. (SetOption is executed in InitDialog).

Does anyone have an idea, what's wrong or how to circumvent the problem?

Re: CRichEditCtrl and SetOptions

jfu28-Jan-13 17:56

jfu2

8-Jan-13 17:56

I have the same problem, I'm waiting solution also. Smile | :)

Re: CRichEditCtrl and SetOptions

jfu28-Jan-13 22:34

jfu2

8-Jan-13 22:34

add code:
m_richedit.ShowScrollBar(SB_VERT,FALSE);
it will be ok. Laugh | :laugh:

Windows Installer

paulb17-Jun-03 13:19

paulb

17-Jun-03 13:19

I used VS.NET 2003 to create a windows installer package but if I try and install the resulting msi package over the top of a previous install it complains with a message "... you must uninstall the previous version first"

Is there any way to allow installing over an existing one? and a related topic is can I set certain files to not be copied to the target if they exist already?

Your thoughts on this singleton implementation

Anonymous17-Jun-03 10:59

Anonymous

17-Jun-03 10:59

I have looked at the Modern C++ Design book and since none of the examples work in VC6 world, figured I should come up with something of my own.

So to start with, what do you think about this Singleton implementation?

header file

#include <windows.h>
class CSingleton
{

public:

static CSingleton & GetSingletonInstance ();

static void Guard();
static void UnGuard();

private:
CSingleton();
CSingleton(const CSingleton & );
virtual ~CSingleton();

static CSingleton * m_pSingleton;

static CRITICAL_SECTION m_CriticalSection;
static long m_lGuardCount;
};

cpp file

#include "Singleton.h"

CSingleton * CSingleton::m_pSingleton;
CRITICAL_SECTION CSingleton::m_CriticalSection;
long CSingleton::m_lGuardCount;

CSingleton::CSingleton()
{

}

CSingleton::~CSingleton()
{

}

CSingleton::CSingleton(const CSingleton & )
{

}

CSingleton & CSingleton::GetSingletonInstance()
{

if(!m_pSingleton)
{
Guard();
if(!m_pSingleton)
m_pSingleton = new CSingleton();
UnGuard();
}

return *m_pSingleton;
}

void CSingleton::Guard()
{
EnterCriticalSection(&m_CriticalSection);
m_lGuardCount++;
}

void CSingleton::UnGuard()
{
LeaveCriticalSection(&m_CriticalSection);
m_lGuardCount--;
}

How does this implementation look to you? The GuardCount is just there for reference. Doyou think Critical Section is enough or should I be using Events or Mutexes?

Re: Your thoughts on this singleton implementation

AlexO18-Jun-03 3:31

AlexO

18-Jun-03 3:31

What does happen if
Anonymous wrote:
m_pSingleton = new CSingleton();

produce an exception?

How do you dispose of m_pSingleton when program ends?

Re: Your thoughts on this singleton implementation

Anonymous18-Jun-03 3:56

Anonymous

18-Jun-03 3:56

As for the disposal part, wouldn't be cleaned up automatically as it is a static variable?

Re: Your thoughts on this singleton implementation

AlexO18-Jun-03 4:13

AlexO

18-Jun-03 4:13

It is usually not very practical (system resources, unwritten files, database connections etc.), and it is extremely annoying during maintenance. I strongly recommend using std::auto_ptr or something similar.

Setting a radio button as the default choice

Jay Hova17-Jun-03 9:41

Jay Hova

17-Jun-03 9:41

Hi,

I am extremely new to using MFC, and am programming a simple application with a couple dialog boxes. I created the dialog boxes and the menu items, but I can not figure out how to set one of the radio buttons as the default choice. I was trying to use the CheckRadioButton feature but it doesn't work.

Any help would be appreciated...

Thanks in advance.

Re: Setting a radio button as the default choice

valikac17-Jun-03 10:02

valikac

17-Jun-03 10:02

One solution is via resource editor. Look for an option to set the default button. Another solution is to initialize the radio buttons in OnInitDialog(). Call SetCheck().

Kuphryn

Re: Setting a radio button as the default choice

David Crow17-Jun-03 10:51

David Crow

17-Jun-03 10:51

If you don't have a member variable for each of the radio buttons, you can use:

BOOL CMyDialog::OnInitDialog()
{
    // assuming there are five radio buttons, set the second one to checked
    CheckRadioButton(ID_RADIO1, ID_RADIO5, ID_RADIO2);
}

Otherwise, create a member variable for each of the radio buttons. Then in OnInitDialog(), set the state of each with SetCheck().

BOOL CMyDialog::OnInitDialog()
{
    // assuming there are five radio buttons, set the second one to checked
    m_btn1.SetCheck(FALSE);
    m_btn2.SetCheck(TRUE);
    m_btn3.SetCheck(FALSE);
    m_btn4.SetCheck(FALSE);
    m_btn5.SetCheck(FALSE);
}

Re: Setting a radio button as the default choice

Ryan Binns17-Jun-03 16:18

Ryan Binns

17-Jun-03 16:18

Use ClassWizard to add a member variable tied to the first radio button in the group. The variable will be of type int. In the dialog box class's constructor, you will see that the variable is set to -1. This means that none of the radio buttons are selected. Set this to 0 (for the first radio button in the group), 1 (for the second in the group) etc.

Hope this helps

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

Re: Setting a radio button as the default choice

Jay Hova18-Jun-03 4:16

Jay Hova

18-Jun-03 4:16

Thanks for all the help.

Did the trick.... Smile | :)

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