C / C++ / MFC

Re: Implementing Finite State Machine using C++

2-Apr-15 4:09

Member 9350237 wrote:
I'm hoping to use a finite state machine(FSM) to switch between screens...

What are the game's states? Inputs?

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CPallini2-Apr-15 6:31

CPallini

2-Apr-15 6:31

Quote:
but every article iv read about them is different and sometimes they leave out details, I couldn't understand it properly.

They are different because FSM are widely used, for different purposes.
There are not may details to understand. A finite state machine is a rather simple stuff. You should understand your scenarion, though.
By wild guess, you could do something like (or go with a more OO approach)

C++

struct FSMData
{
  FSMState state;
  // other useful data
};

void update_fsm(FSMData & fsmd)
{
  switch(fsmd.state)
  {
  case STATE_MENU:
   handle_menu(fsmd);
   break;
  case STATE_GAME:
   handle_game(fsmd);
  //...
  }

void handle_menu(FSMData & fsmd)
{
  //...
  if ( userSelection() == PLAY_GAME)
  {
    // cleanup here
    fsmd.state = STATE_GAME;
    return;
  } 
  // ...
}

void handle_game(FSMData & fsmd)
{
  // ...
  if (userInput() == QUIT_GAME)
  {
    // cleanup here
    fsmd.state = STATE_MENU;
    return;
  }
  // ...
}

Message Closed

2-Apr-15 9:10

Member 9350237

2-Apr-15 9:10

Message Closed

modified 13-Apr-15 6:10am.

Re: Implementing Finite State Machine using C++

Sascha Lefèvre3-Apr-15 0:53

Sascha Lefèvre

3-Apr-15 0:53

CPallini has given you a basic example for a FSM - you will understand that we're not here to provide ready solutions. You have formulated your game states - what stops you from extending that sample with that, or, at least trying?

const char error

ForNow1-Apr-15 4:01

1-Apr-15 4:01

Hi
I am getting a number of errors in MFC functions (Using Visual Studio 2012)

can't convert const char [xx] to LPCTSTR when using a literal with " double qoute it

was my understanding that anything with " was a pointer now weather its char * or

LPCTSTR is a different issue however it shouldn't be of type const char[xx]

Thanks

Richard MacCutchan1-Apr-15 4:07

Richard MacCutchan

1-Apr-15 4:07

Do you have the project set to use the Unicode character set? If so LPCTSTR is equivalent to LPCWSTR, so you cannot convert a char pointer to it.

ForNow1-Apr-15 5:13

1-Apr-15 5:13

Richard

you did it again !!!!! Wink | ;)

Richard MacCutchan1-Apr-15 5:17

Richard MacCutchan

1-Apr-15 5:17

Thanks. Sadly my flashes of brilliant intuition are getting fewer and further apart these days. Frown | :(

David Crow1-Apr-15 5:13

1-Apr-15 5:13

Try using TCHAR instead of char, and wrapping string literals in the _T() macro.

vishwadeepak mani tripathi

vishwadeepak mani tripathi2-Apr-15 8:05

2-Apr-15 8:05

Please read __What are TCHAR, WCHAR, LPSTR, LPWSTR, LPCTSTR (etc.)?[^]

ForNow2-Apr-15 9:46

2-Apr-15 9:46

I prefixed the string with a _T macro

And it compiled
Thanks for your help

I have to re-read and he article

ForNow2-Apr-15 16:54

2-Apr-15 16:54

In my visual Studio project for character set I choose <not set=""> not sure what that means ansi?

1 byte

The other two choices were Unicode and multi byte

So if Unicode is character representation by 2 bytes. what is multi byte ?

David Crow3-Apr-15 3:23

3-Apr-15 3:23

ForNow wrote:
So if Unicode is character representation by 2 bytes. what is multi byte ?

See here.

ForNow3-Apr-15 4:27

[C++]execute other program on second monitor

3-Apr-15 4:27

So if I select for my project setting char set -> not set .... And wrap all of my strings with a _T( macro is that best practice

... Thanks

Member 1156860630-Mar-15 19:22

Member 11568606

30-Mar-15 19:22

Will you show me the full example?

Re: [C++]execute other program on second monitor

Richard MacCutchan30-Mar-15 23:13

Richard MacCutchan

30-Mar-15 23:13

Please read http://www.codeproject.com/Messages/2922875/HOW-TO-ASK-A-QUESTION.aspx[^].

Unwanted radio button click

lor7530-Mar-15 8:29

lor75

30-Mar-15 8:29

Hello,

I have programmed a MFC utility with some radio buttons on the main window.
When I click on a radio button the BN_CLICKED message is captured by the handler and does some task.
I have seen an unexpected behaviour: when I open another window (hard disk explorer, control panel, speaker volume and also a generic folder) and then I close it, the radio button clicks even I haven't clicked the mouse on the radio button.
I suppose that this is caused by my program's window that get the focus when I close the other window.
How can I block this behaviour?

David Crow30-Mar-15 9:24

30-Mar-15 9:24

This behavior is, or at least used to be, by design. When [de]activating the window, the radio buttons do not know that. All they know is that they got focus, and the behavior for radio buttons is to auto-select on focus.

See the WM_SETFOCUS message here.

lor7531-Mar-15 8:47

lor75

31-Mar-15 8:47

Ok,
I have read the WM_SETFOCUS page and now I disable all the radiobuttons when the window lose focus. This works but it seems a strange solution to me.
I wonder if there is a better way to solve the problem. I want to discard message from radiobuttons when they are launched by focus changes.

David Crow31-Mar-15 9:23

31-Mar-15 9:23

I just put together a dummy MFC app with four radio buttons, and an ON_BN_CLICKED() handler for each. With the app running, I open various other windows and then switch back to it, none of the four handlers are fired. Hmmmm

lor7531-Mar-15 20:42

lor75

31-Mar-15 20:42

Dear David,
they aren't fired because you switch from one window to another without have a focus on radiobutton.

If you click on a radio button with the mouse the radio button gets focus: if you switch frome one window to another you will see that the handlers are fired.
If you never click on radiobutton with mouse this doesn't happen.

David Crow1-Apr-15 2:14

Binary Tree Recursion Problem

1-Apr-15 2:14

Nope, radio button had focus.

Member 1156724330-Mar-15 5:21

Member 11567243

30-Mar-15 5:21

Does somebody have an idea why will the following happen:

printf("Min Value: %d\n", minValue(root));
printf("Max Value: %d\n", maxValue(root));
// not sure why line below throws segmentation core
//printf("Min Val: %d Max Val: %d\n", minValue(root), maxValue(root));

minValue and maxValue are recursive functions returning the min/max value of a binary tree, when called separately as in lines 1 & 2 they work fine, but when called from the same printf statement I get a segmenation fault in linux.

Thanks!

Re: Binary Tree Recursion Problem

David Crow30-Mar-15 6:01