C / C++ / MFC Discussion Boards

David Crow19-Aug-04 4:58

19-Aug-04 4:58

mailMonty wrote:
How do i check that these Paths exists...

Do you mean with something like _access()? If not, please explain the problem further as I do not understand exactly what the goal is.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Uninstall Blues

toxcct19-Aug-04 5:01

toxcct

19-Aug-04 5:01

always so concise in your answers dear David... i appreciate ! Laugh | :laugh:

;)

TOXCCT >>> GEII power

Re: Uninstall Blues

David Crow19-Aug-04 5:07

David Crow

19-Aug-04 5:07

As Steven Covey says:

"Seek first to understand, then to be understood."

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

How to Initialize an array of user selected size

Deepak Samuel19-Aug-04 3:45

Deepak Samuel

19-Aug-04 3:45

Hi,
How do I initilaize an array whose size will be determined by an user input(For example from a edit box ?
I tried this but they didnt work...

numsamples = m_numsamp;
const long arr = numsamples;
ULONG x[arr];
ULONG y[arr];

They returned error 2057 and 2466.
Thanks!

Deepak Samuel.

Re: How to Initialize an array of user selected size

RChin19-Aug-04 3:59

RChin

19-Aug-04 3:59

You need to dynamically allocate your array. This is where pointers comes very handy!

ULONG* arrA = NULL;
int nSize;

<font color=green>// Get size of array from user</font>
..
<font color=green>// allocate array to given size</font>
arrA = new ULONG[nSize];
if(NULL != arrA)
{
   <font color=green>// work with array.</font>
   arrA[0] = 1234;
   cout << _T("yeah baby!") << arrA[0] << endl;

   <font color=green>// don't forget to clean up when finished</font>
   delete [] arrA;
{

I Dream of Absolute Zero

noisy AfxMessageBox

V.19-Aug-04 3:27

19-Aug-04 3:27

Hello,

Does anybody know if you can 'disable' the beep when calling an AfxMessageBox? This is quite annoying.

tnx!!

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

Re: noisy AfxMessageBox

RChin19-Aug-04 3:52

RChin

19-Aug-04 3:52

I don't think you can switch it off programmatically from the ::MessageBox() function.

Have a look in your Control Panel, under 'Sounds, Speech, and Audio Devices'. You can control the WAV associated with a windows event, including the message box sound(Default Beep). You can even choose to switch it off from there.

I Dream of Absolute Zero

Program Starts Minized

sweep12319-Aug-04 3:25

sweep123

19-Aug-04 3:25

I have an application which starts another application, but I dont need to see the dialog window of this other program. The user can maximise it if required.

I have tried the following to hide the dialog window in the program:-

this->OnShowWindow (FALSE, 0);   // Place in the InitDlg routine<br />
<br />
and this->ShowWindow (SW_HIDE); // PLaced in the JoyMove routine

but the dialog wind is still visable.

I start the program via CreateProcess (see below):-

::ZeroMemory(&si[0], sizeofsi[0]));  <br />
GetStartupInfo(&si[0]);<br />
si[0].dwX = 0;<br />
si[0].dwY = 0;<br />
si[0].dwFlags = STARTF_USEPOSITION;<br />
CreateProcess(	NULL, <br />
		"c:\\Program Files\\Joystick\\MSCPP.exe",  // Name of app to launch<br />
		NULL,      // Default process security attributes<br />
		NULL,      // Default thread security attributes<br />
		FALSE,     // Don't inherit handles from the parent<br />
		0,		   // Normal priority<br />
		NULL,      // Use the same environment as the parent<br />
		NULL,      // Launch in the current directory<br />
		&si[0],    // Startup Information<br />
		&pi[0]);   // Process information stored upon return CW_USEDEFAULT

Any comments please as I am sure a simple solution exists.

Re: Program Starts Minized

RichardS19-Aug-04 3:51

RichardS

19-Aug-04 3:51

Just change your startup information:

sweep123 wrote:
si[0].dwFlags = STARTF_USEPOSITION;

Try this:

si[0].dwFlags = STARTF_USEPOSITION | STARTF_USESHOWWINDOW;<br />
si[0].wShowWindow = SW_MINIMIZE;

cheers,
Rich

"Programming today is a race between software engineers striving to build bigger and
better idiot-proff programs, and the Universe trying to produce bigger and better idiots.
So far the Universe is winning." -- Rich Cook

Re: Program Starts Minized

sweep12319-Aug-04 5:45

sweep123

19-Aug-04 5:45

Thanks, but no luck.

The program window is NOT minimised.

Re: Program Starts Minized

gamitech19-Aug-04 10:57

gamitech

19-Aug-04 10:57

try ShellExecute
Last parameter set it to SW_HIDE
or ShellExecuteEx
or LoadModule()

gabby

Re: Program Starts Minized

Ryan Binns19-Aug-04 18:25

Ryan Binns

19-Aug-04 18:25

Does the dialog have a minimise button? If it doesn't, you can't minimise it.

Ryan

"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"

Suspending external application

WzR19-Aug-04 3:08

WzR

19-Aug-04 3:08

Hello...
I need to run an external program, suspend at some offset, retrieve register values(like ebx) and continue running external app.

That is the problem Smile | :)

How do run-time patchers work?

P.S.: Please reply to ths@smtp.ru
Thanks...

Using Visual C++ .NET (ClassWizard)

Jon Hulatt19-Aug-04 3:05

Jon Hulatt

19-Aug-04 3:05

Hi Guys,

I'm sure this is a very easy question, but i'm damned if i can find the answer. I've just started using VS.NET instead of VC6- but still for unmanaged, MFC development.

In VC6, I could very simply use classwizard to create an override of CDialog::OnInitDialog, and have VC6 generate a stub function for me (which called the base class implementation).

How do you do this is Visual C++ .NET ? Surely there must be a way.

Thanks

Jon

#include <beer.h>

Re: Using Visual C++ .NET (ClassWizard)

Andrew Walker19-Aug-04 15:19

Andrew Walker

19-Aug-04 15:19

In the class view select the appropriate class that you want to add the handler for. In the properties window, click on the overrides button (little green boxy looking icon). Scroll down to onInitDialog, click in the right hand column, click on the drop down box, select on '<<add>> OnInitDialog', the code should have been added.

You add WM_* event handlers in the same way, except you click on the messages button first.

If you can keep you head when all about you
Are losing theirs and blaming it on you;
If you can dream - and not make dreams your master;
If you can think - and not make thoughts you aim;
Yours is the Earth and everything that's in it.

Rudyard Kipling

Re: Using Visual C++ .NET (ClassWizard)

Jon Hulatt19-Aug-04 20:49

Jon Hulatt

19-Aug-04 20:49

Wow, thankyou. Bizarrely, i'd not noticed the Overrides and Messages buttons!. I expected there to be either a mechanism for overrides on the Add Method dialog, or maybe something on the context menu you get when right clicking a method in the base class. But no. Smile | :)

Thanks

Jon

#include <beer.h>

Window messages

RichardS19-Aug-04 3:00

RichardS

19-Aug-04 3:00

Hi,

Is there a way of sending character keys to other apps (eg Notepad)?

Currently I can get the hwnd for the notepad window, and I can close it down by do ::PostMessage (hwnd, WM_QUIT, 0, 0). Thus I know I have the correct hwnd. However when I send WM_CHAR no characters appear. Any ideas?

Also, is it possible to post keys that correspond with menu items (eg 'ALT-F' (for file) then 'S' (for save))?

cheers,
Rich

"Programming today is a race between software engineers striving to build bigger and
better idiot-proff programs, and the Universe trying to produce bigger and better idiots.
So far the Universe is winning." -- Rich Cook

Re: Window messages

Ivan Cachicatari19-Aug-04 4:38

Ivan Cachicatari

19-Aug-04 4:38

Hi,

To send file messages use this code:

#define NOTEPAD_FILE_NEW     9
#define NOTEPAD_FILE_OPEN   10
#define NOTEPAD_FILE_SAVE    1
#define NOTEPAD_FILE_SAVEAS  2

::PostMessage(hwnd,WM_COMMAND,NOTEPAD_FILE_OPEN); // open a file

// hwnd is a notepad handle

To send key message use:

::PostMessage(hwnd,WM_KEYDOWN, 'm', 0); //sends 'm' chartacter

Ivan Cachicatari
www.latindevelopers.com

what does "this" mean?

Deepak Samuel19-Aug-04 2:33

Deepak Samuel

19-Aug-04 2:33

I just encountered this "this" in a sample code. Can anyone explain what it means?.

_param->_this = this;

Is the "this" an operator?
Thanks.

Deepak Samuel

Re: what does "this" mean?

David Crow19-Aug-04 2:46

David Crow

19-Aug-04 2:46

The this pointer refers to the object in which it is invoked.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: what does "this" mean?

Maximilien19-Aug-04 2:46

Maximilien

19-Aug-04 2:46

this is the current object instance.

you can do stuff like that...

class CClass
{
  int i;
  void Method();
}

void CClass::Method()
{
 // equivalent.
 this->i = 1;
 i = 1; 
}

or if you you want to pass yourself to another class or method :

...
 CPaintDC dc(this); 
...

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: what does "this" mean?

V.19-Aug-04 3:34

19-Aug-04 3:34

"this" is introduced so the compiler could make the difference between members of the class and members of another object.
eg. if you would do this:

<br />
public void SetSomeInt(int input){<br />
 input = input;<br />
}<br />

then the compiler probably would complain. which one is the parameter and which one is the variable of the class?
if you do this:

<br />
public void SetSomeInt(int input){<br />
 this->input = input;<br />
}<br />

it will probably work.

It's just a pointer to the Object itself.

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

Re: what does "this" mean?

V.19-Aug-04 3:34

19-Aug-04 3:34

"this" is introduced so the compiler could make the difference between members of the class and members of another object.
eg. if you would do this:

<br />
public void SetSomeInt(int input){<br />
 input = input;<br />
}<br />

then the compiler probably would complain. which one is the parameter and which one is the variable of the class?
if you do this:

<br />
public void SetSomeInt(int input){<br />
 this->input = input;<br />
}<br />

it will probably work.

It's just a pointer to the Object itself. (and that's the reason why you can't use it in static functions)

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

Re: what does "this" mean?

Antony M Kancidrowski19-Aug-04 4:20

Antony M Kancidrowski

19-Aug-04 4:20

I would advise that you *DO NOT* use the same naming convention for local function variables and member variables. It can, and will, always lead to confusion and mistakes.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)

Re: what does "this" mean?

V.19-Aug-04 4:44

19-Aug-04 4:44

Quite true.

Just to have no misunderstandings : "I do not do that" Smile | :)

, but the example just explains nicely what 'this' means.

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

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