C / C++ / MFC

Andy Moore9-Feb-06 9:14

Andy Moore

9-Feb-06 9:14

Do something like this:

BOOL b = EnumChildWindows( hWndDlg, EnumFunc, NULL );


BOOL CALLBACK EnumFunc( HWND hwnd, LPARAM lParam )
{
   EnableWindow( hwnd, FALSE ); 
}

Andy

Human beings were not meant to sit in little cubicles staring at computer screens all day, filling out useless forms and listening to eight different bosses drone on about about mission statements. -- Peter Gibbons

David Crow9-Feb-06 9:15

9-Feb-06 9:15

Are you wanting to disable all of the controls on the dialog, or the dialog itself?

"The greatest good you can do for another is not just to share your riches but to reveal to him his own." - Benjamin Disraeli

#realJSOP9-Feb-06 10:09

#realJSOP

9-Feb-06 10:09

Try this:

HWND hwnd = ::GetTopWindow(this->GetSafeHwnd());
// while we have a valid hwnd, 
// loop through all child windows
while (hwnd)
{
    // do something with the hwnd
    // and get the next child control's hwnd
    hwnd = ::GetNextWindow(hwnd, GW_HWNDNEXT);
    ::EnableWindow(hwnd, FALSE);
}

------- sig starts

"I've heard some drivers saying, 'We're going too fast here...'. If you're not here to race, go the hell home - don't come here and grumble about going too fast. Why don't you tie a kerosene rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt

"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Multithreaded Programming

jhwurmbach10-Feb-06 3:27

jhwurmbach

10-Feb-06 3:27

If you want to disable the control on this dialog, the MFC-way of doing it would be creating a variable
bool ControlsEnabled;

and use OnCmdUI-Handler on each Control to do
pCmdUI->Enable( ControlsEnabled /*&& other conditions*/);

"We trained hard, but it seemed that every time we were beginning to form up into teams we would be reorganised. I was to learn later in life that we tend to meet any new situation by reorganising: and a wonderful method it can be for creating the illusion of progress, while producing confusion, inefficiency and demoralisation."

-- Caius Petronius, Roman Consul, 66 A.D.

RanjanShrestha9-Feb-06 8:07

RanjanShrestha

9-Feb-06 8:07

Why do multithreaded programs behave differently in DEBUG mode and RELEASE mode?

Re: Multithreaded Programming

Rage9-Feb-06 8:13

Re: Multithreaded Programming

9-Feb-06 8:13

Because you use two different libs or dlls. The debug versions contain more information to make it easier to debug the code, and probably also the behaviour is different so that a thread is halted when you debugstep into another one.

~RaGE();

RanjanShrestha9-Feb-06 8:17

RanjanShrestha

9-Feb-06 8:17

Does that mean that a program running well in DEBUG mode may not run the same way in RELEASE mode?

Re: Multithreaded Programming

Rage9-Feb-06 8:31

Re: a little output problem

9-Feb-06 8:31

Of course, see these articles (especially "Surviving the release build") if you want to learn more about it.

http://www.codeproject.com/info/search.asp?cats=2&searchkw=debug+and+release&Submit1=Search&author=&sd=11%2F15%2F1999&ed=2%2F9%2F2006[^]

(I stole that link form a previous post of Owner drawn a few minutes ago Smile | :)

)

~RaGE();

a little output problem

Peter Charlesworth9-Feb-06 7:46

Peter Charlesworth

9-Feb-06 7:46

hey guys

i'm a novice c++ programmer and i'm currently making a program

everything works fine, but there's one slight problem...

i need to have the program output a text on-screen and i don't know how.

Let me explain, the program i want to make basically displays a text on the screen of your computer.
not the DOS prompt where it executes the program, but the screen itself.

Think of an alert-messenger that does so not by using those windows, but by just displaying the text
it needs to display.

How can I do that?

If it's no trouble, i'm also wondering if the gotoxy(x,y) (using the conio.h file) works with whatever solution to my problem you have. And how can i make that text disappear after a pre-set amount of time?

thanks for your help

regards,

peter

#include borland c++ compiler 5.5
using Windows XP;

int main()
{
cout << "Hi! I'm Peter!\n";
return 0;
}

Rage9-Feb-06 8:15

Getting CXX0030: Error: expression cannot be evaluated

9-Feb-06 8:15

Peter Charlesworth wrote:
Think of an alert-messenger that does so not by using those windows, but by just displaying the text
it needs to display.

I have no idea how to do it without "those windows", but you could draw your text on a transparent window, giving the impression that the text is displayed "on the screen".

~RaGE();

zahid_ash9-Feb-06 7:34

zahid_ash

9-Feb-06 7:34

I am using the code below

typedef CArray<float, float> INT_PERCENT1;
INT_PERCENT1 arrPercentage1;
INT_PERCENT1 arrPercent1;

arrPercentage1 have a data in the array already added. but arrPercent have not element yet added. I want to copy a data from
arrPercentage1 to arrPercent1

for ( int j = 0 ; j< countloop ; j++)
{
arrPercent1.SetAt(j, m_arrPercentage1.GetAt(j));
m_arrRank1.SetAt( j , 0);
}

at the line arrPercent1.SetAt(j, m_arrPercentage1.GetAt(j));
the program crashes , while debugging i got the error
CXX0030: Error: expression cannot be evaluated

Regards.

Re: Getting CXX0030: Error: expression cannot be evaluated

David Crow9-Feb-06 7:42

Re: Getting CXX0030: Error: expression cannot be evaluated

9-Feb-06 7:42

zahid_ash wrote:
I want to copy a data from
arrPercentage1 to arrPercent1

So why not just use the Copy() method?

"The greatest good you can do for another is not just to share your riches but to reveal to him his own." - Benjamin Disraeli

Rage9-Feb-06 7:44

minimizing or hiding the DOS window in VC++ exe application

9-Feb-06 7:44

It crashes because you do not assign memory to your second table.

Three possibilities:

for ( int j = 0 ; j< countloop ; j++)
    {
        arrPercent1.SetAtGrow(j, m_arrPercentage1.GetAt(j));    
        m_arrRank1.SetAt( j , 0);  // i do not know for this one
    }

or initialize the size before the loop:

arrPercent1.SetSize(m_arrPercentage1.GetSize());
for ...

Or, the best solution:

arrPercent1.Copy(m_arrPercentage1);

~RaGE();

sashabkvs9-Feb-06 6:32

sashabkvs

9-Feb-06 6:32

Hi all,

I am new to VC++.I have developed an "exe" application in VC++.I need to execute some DOS
commands from this application but, the problem is whenever I run the code, it automatically creates a dos window because of the "system" command and covers my dialog window. Is there any funtion that can hide or minimize that DOS window?If so where do i place that part of the code??

Thanks
Sasha

Re: minimizing or hiding the DOS window in VC++ exe application

Rage9-Feb-06 7:11

Re: minimizing or hiding the DOS window in VC++ exe application

9-Feb-06 7:11

Can you post the code you use to "execute some DOS commands" ?

If you use WinExec to fire up the commands, you can provide SW_HIDE as second parameter to hide the window. More elaborated would be to use the CreateProcess function.

Is your app a MFC app or a console app ?

~RaGE();

David Crow9-Feb-06 7:12

how to retrieve primary keys from Ms.Access with ODBC connection

9-Feb-06 7:12

sashabkvs wrote:
...because of the "system" command...

Which is a very good reason to avoid using this antiquated function. It's just a holdover from the Unix environment. What exactly is it that you are trying to do?

"The greatest good you can do for another is not just to share your riches but to reveal to him his own." - Benjamin Disraeli

Catch USB-Events

BruteF0rce9-Feb-06 5:41

BruteF0rce

9-Feb-06 5:41

Hello!
I want to catch events on the usb, like "the user plugged in a hid" Smile | :)

I tried the WM_DEVICECHANGE, but this one helps only with USB-Sticks.
Is there a way to get this information?
Thank You

Re: Catch USB-Events

Dr. Russell9-Feb-06 6:31

Dr. Russell

9-Feb-06 6:31

Set the GUID ( DEV_BROADCAST_DEVICEINTERFACE.dbcc_classguid ) to the class of devices that you want to monitor. That will take some digging on your part to discover the proper GUIDs

DEV_BROADCAST_DEVICEINTERFACE devBroadcastDeviceInterface;
ZeroMemory( &devBroadcastDeviceInterface, sizeof( devBroadcastDeviceInterface ));
devBroadcastDeviceInterface.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
devBroadcastDeviceInterface.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
devBroadcastDeviceInterface.dbcc_classguid = GUID_DEVINTERFACE_USB_DEVICE;//GUID_DEVINTERFACE_HID
m_hDevNotify = RegisterDeviceNotification ( g_hWnd, &devBroadcastDeviceInterface, DEVICE_NOTIFY_WINDOW_HANDLE );

Re: Catch USB-Events

Requiem Sollar9-Feb-06 9:23

Requiem Sollar

9-Feb-06 9:23

Good answer for the use case. I used
static /*const*/ GUID GUID_DEVINTERFACE_USB_DEVICE =
{ 0xA5DCBF10L, 0x6530, 0x11D2, { 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED } };

However if I wanted to detect a user inserting/removing a card from a usb card reader... any one? Currently i only know if the carder reader is plugged/unplugged... not if the card is inserted / removed

Issa Salama9-Feb-06 5:25

Issa Salama

9-Feb-06 5:25

Hi all
i'm trying to retrieve primary keys by calling SQLPrimaryKeys function, but the problem is that Ms. Access doesn't support this function, Does anyone know how get the primary keys of a specific table for MS. Access using ODBC.

Re: how to retrieve primary keys from Ms.Access with ODBC connection

David Crow9-Feb-06 7:19