Re: how to assign unsigned char in c++? - C / C++ / MFC Discussion Boards

Re: Encrypting the existing file and folder

Richard MacCutchan6-May-11 3:05

Richard MacCutchan

6-May-11 3:05

Try asking your question of the author of CZipArchive here[^].

The best things in life are not things.

Re: Encrypting the existing file and folder

sarfaraznawaz11-May-11 22:49

sarfaraznawaz

11-May-11 22:49

how to use it this function CZipArchive::EncryptFile()in MFC in ZIP archive lib they have mention that this function is used encrypt the existing file.i am not able to understand the what parameter does it take uindex means please make it clear with example code ......

Re: Encrypting the existing file and folder

Richard MacCutchan11-May-11 23:22

Richard MacCutchan

11-May-11 23:22

Did you do what I suggested?

The best things in life are not things.

how to assign unsigned char in c++?

mathivanaan6-May-11 1:00

mathivanaan

6-May-11 1:00

Hi,
I am working Fodero eclipse c++. I have one unsigned char(one byte unsigned integer) variable.
i am passing some integer value. like

unsigned char aa= 10;

but aa is not assign that value? How to pass that value on unsigned char.

same like i am using unsigned long, i add 'u' on the end the passing number.

unsigned long bb= 10u;
here i got bb value is 10.

how to get unsigned char value?. Any ideas or link share to me.

please urgent

Regards,
M.Mathivanan

Re: how to assign unsigned char in c++?

C^hris L^osinger6-May-11 1:01

C^hris L^osinger

6-May-11 1:01

mathivanaan wrote:
but aa is not assign that value?

how do you know this?

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Re: how to assign unsigned char in c++?

Niklas L6-May-11 1:18

Niklas L

6-May-11 1:18

mathivanaan wrote:
please urgent

Sorry for not understanding: Is it the question that is urgent or the answer, or maybe both? Could you elaborate?

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Re: how to assign unsigned char in c++?

CPallini6-May-11 10:18

CPallini

6-May-11 10:18

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: how to assign unsigned char in c++?

Stefan_Lang6-May-11 2:21

Stefan_Lang

6-May-11 2:21

Your assignment looks valid. How did you test that aa does not hold the correct value? If you checked in the debugger, or pass it to cout, please remember that the type is still a character, and the standard representation is as a character. The value 10 is a non-prinitable character, and as such would show no visible output either in the debugger or in a printout, unless you convert aa to int first.

Re: how to assign unsigned char in c++?

Luc Pattyn6-May-11 2:43

Luc Pattyn

6-May-11 2:43

unsigned char aa = (unsigned char)10;

BTW: when you get build-time messages or run-time errors/exceptions, you should mention them verbatim in your question.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

Re: how to assign unsigned char in c++?

CPallini6-May-11 10:21

CPallini

6-May-11 10:21

mathivanaan wrote:
unsigned char aa= 10;

The statement is indeed correct. Probably the fault is in the way you check it.
Smile | :)

Re: how to assign unsigned char in c++?

mike@codeproject8-May-11 5:51

mike@codeproject

8-May-11 5:51

You are getting a 10 as a binary value with that assignment.

If you use cout<< to print it out, however, you won't see a 10. That's because cout<< called on a char or unsigned char value always treats the value as a character, not a number. What you will see is that the next thing you output will begin on a new line. The 10 translates to a '\n' newline character.

To see the binary value of a char as a unsigned decimal value, use a typecast first.

unsigned char bb = 10;
cout << "** bb looks like [" << bb <<] this." << endl;
cout << "** (unsigned)bb looks like: " << (unsigned)bb << endl;

Which should display:

** bb looks like [
] this.
** (unsigned)bb looks like: 10

I put the unsigned char version in [] brackets so you can see what the effect is on the output.

Cheers,
Mike

Re: how to assign unsigned char in c++?

mathivanaan9-May-11 18:48

mathivanaan

9-May-11 18:48

Thanks Mike. i try it your solution.

how to pass values between dialog window in MFC

lamrinraj5-May-11 23:55

lamrinraj

5-May-11 23:55

how can i pass the values from child dialog window to parent dialog window. (ie) text box value and etc.., (how to use AfxGetApp())

Ex:
1).CTestdlg (parend dlg)
2).CDatadlg (child dlg)
i want to get data from the CDatadlg edit box to CTestdlg member

Re: how to pass values between dialog window in MFC

Cool_Dev6-May-11 1:07

Cool_Dev

6-May-11 1:07

One way is to set the parent dialog pointer to the child window, after creating it. Use this pointer to call parent dialog's functions to notify or to directly set the values.

// CDataDlg.h

// Forward declaration
class CTestDlg;
class CDataDlg
{
  .......
  public:
      SetParentDlg(CTestDlg* parent)
      {
         m_pTestDlg = parent;
      }
  private:
      CTestDlg* m_pTestDlg;
}

From CTestDlg, after creating child dlg, call SetParentDlg(this) on it.

// CDataDlg.cpp
#include "testdlg.h"
......
// Get data from text box here..
m_pTestDlg->Function(data);

Also, you may use SetParent() and GetParent() functions on CTestDlg, and cast the returned pointer to CTestDlg* and use.

AfxGetApp() returns the CWinApp pointer, and you can cast this to your MFC application class and use.

Re: how to pass values between dialog window in MFC

lamrinraj9-May-11 1:56

lamrinraj

9-May-11 1:56

Thanks "Cool_Dev" it works fine.

Re: how to pass values between dialog window in MFC

David Crow9-May-11 3:54

David Crow

9-May-11 3:54

lamrinraj wrote:
...it works fine.

It may "work" but why would you want to "link" two dialog boxes together in this fashion? Having such a strong-coupling model is rarely a good idea.

"One man's wage rise is another man's price increase." - Harold Wilson

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"Some people are making such thorough preparation for rainy days that they aren't enjoying today's sunshine." - William Feather

Re: how to pass values between dialog window in MFC

Niklas L6-May-11 1:12

Niklas L

6-May-11 1:12

1. Send a user defined message to GetParent()
2. Cast GetParent() to CTestDlg* and call a method / set a variable
3. Implement the observer pattern.
4. Use a callback function.

Any of those will do if you need to notify the parent dialog while the child dialog is still opened.

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Ball Physics

Cyclone_S5-May-11 23:51

Cyclone_S

5-May-11 23:51

Hi,

I'm creating a brick game and am having trouble merging these two if blocks. They work independantly fine but not together. Any ideas on how to get them to work. They reverse the velocities of the ball when hitting a brick. I'm also having a problem where the ball sometimes goes through a brick, it flickers and slowly makes its way through,kinda glitchy.

if(Ball_List[b]->gameBall->Bounds.IntersectsWith(Brick1->Bounds))
{

    if((Ball_List[b]->gameBall->Right >= Brick1->Left || Ball_List[b]->gameBall->Left <= Brick1->Right))
    {
        Ball_List[b]->xVel = -Ball_List[b]->xVel;

    }

    if((Ball_List[b]->gameBall->Bottom >= Brick1->Top || Ball_List[b]->gameBall->Top <= Brick1->Bottom))
    {
        Ball_List[b]->yVel = -Ball_List[b]->yVel;
    }
}

Re: Ball Physics

Richard MacCutchan6-May-11 2:58

Richard MacCutchan

6-May-11 2:58

You are using logical OR (||) instead of AND (&&). In the first case if BALL.RIGHT is greater than BRICK.LEFT OR BALL.LEFT is less than BRICK.RIGHT you slow it down. However you need both conditions to be true; for example if BALL.RIGHT is greater than BRICK.LEFT then you change velocity, but the ball is not necessarily less than BRICK.RIGHT at this point. I think the same holds true for the vertical movement.

The best things in life are not things.

Re: Ball Physics

Cyclone_S6-May-11 7:57

Cyclone_S

6-May-11 7:57

I tried using && instead of || but it messed up the ball physics. The ball would return in the same direction back towards the paddle.

The problem seems to be that Ball.right is is always going to be greater then Ball.left when the ball is colliding with the top or bottom of the brick so the check for horizontal collision will also get executed. I'm not sure how to work around this.

Thanks.

Re: Ball Physics

CPallini6-May-11 10:29

CPallini

6-May-11 10:29

Cyclone_S wrote:
Ball_List[b]->gameBall->Right >= Brick1->Left

Physically, the ball have already passed the bound of the brick, i.e. reversing the speed is not enough: you should update the position accordingly.
Smile | :)

Re: Ball Physics

Cyclone_S6-May-11 21:35

Cyclone_S

6-May-11 21:35

This is as close as I got so far but it makes the ball pause for a moment when it hits the top and bottom of the brick. This code is in the timer event. Any solution to this? Thanks.

// Check for brick collisions.
					if(left == false && Ball_List[b]->gameBall->Bounds.IntersectsWith(Brick1->Bounds))
					{
						
						if((Ball_List[b]->gameBall->Right >= Brick1->Left || Ball_List[b]->gameBall->Left <= Brick1->Right))
						{
							Ball_List[b]->xVel = -Ball_List[b]->xVel; left = true; top = true;

						}

					}
					else {left=false;}

					if(top == false && Ball_List[b]->gameBall->Bounds.IntersectsWith(Brick1->Bounds))
					{
						
						if((Ball_List[b]->gameBall->Bottom >= Brick1->Top || Ball_List[b]->gameBall->Top <= Brick1->Bottom))
						{
							Ball_List[b]->yVel = -Ball_List[b]->yVel; top = true;
						}
					}
					else{top=false;}

Re: Ball Physics

Stefan_Lang10-May-11 5:11

Stefan_Lang

10-May-11 5:11

Recently I've found a very neat blog that explains how to implement some basic physics of a very similar kind as what you are trying to achieve. Check out Physics engine for dummies for some very useful explanations and code that can get you started. The explanations you can find there on how best to implement collision control are very exhaustive.

Although the code examples do not feature rectangular bricks, I am sure you can adapt them quite easily by stealing the code from the collision control with the outside border. You just need to make sure that you will always have to check all borders, rather than just 1 at a time. However, for a start it may be easier to just use circular bricks and a circular ball.

Setting BGColor to a WebBrowser Control [modified]

pix_programmer5-May-11 1:32

pix_programmer

5-May-11 1:32

Hi!
How to set the Background color and BackGround Image to a CExplorer control in MFC?

modified on Thursday, May 5, 2011 7:42 AM

Re: Setting BGColor to a WebBrowser Control

వేంకటనారాయణ(venkatmakam)5-May-11 1:54

వేంకటనారాయణ(venkatmakam)

5-May-11 1:54

What is CExplorer?

http://www.mono-project.com/Main_Page

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.