C / C++ / MFC

toxcct30-Jan-06 6:55

toxcct

30-Jan-06 6:55

but you have to take not that the switch() works only for integer types...

never do this :

char* pszString = "Hello...";
 
switch (pszString) {
  case "Hello":
    //...
    break;
 
  case "World":
    //...
    break;
 
  default:
    //...
}

this is bad !!!!!!

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VCalc 3.0 soon...]

Eytukan30-Jan-06 7:14

Eytukan

30-Jan-06 7:14

yeaa tox , that's really bad about it Sigh | :sigh:

VuNic

BadKarma30-Jan-06 9:50

BadKarma

30-Jan-06 9:50

you can use strings in a switch
when the text is limited to 4 char

thats how the ftp, telnet and email server work,
they all use 4 letter commands to work

char szCmd[80];
unsigned long* pulCmd = &szCmd;

switch(*pulCmd)
{
case 0x706c6568: // "help"
 Help();
 break;
case 0x74697571: // "quit"
 Quit();
 break;
case 0x6e65706f: // "open"
 Open();
 break;
}

codito ergo sum

Using a non static member in a overloaded static member function

Eytukan30-Jan-06 20:16

Eytukan

30-Jan-06 20:16

good 'new's. Cool | :cool:

VuNic

arunaas30-Jan-06 5:16

arunaas

30-Jan-06 5:16

Hi
The scenario here: Have a static member function defined in a base class which is being overridden in the derived class. This overloaded static member function needs to use a non static member variable.

So, as of now, trying not to change the signature of the static member function since it is part of the WTL - CDialogResize<t>.

As of now, workaround:

Since I am unable to pass the non static member as an parameter to the function without changing the signature of the function in the derived class as well as the base class, created a static member that stores the non static member value which I then use during the execution of the static function.

The problem here is that the value becomes static. So, even for a different instance of the same class, this values gets updated. This is not a preferred behavior in this case. Any tips would be appreciated.

Regards
Aruna

Re: Using a non static member in a overloaded static member function

Michael Dunn30-Jan-06 7:26

Michael Dunn

30-Jan-06 7:26

arunaas wrote:
This overloaded static member function needs to use a non static member variable.

By definition, a static method cannot do that. It sounds like you're trying to work around a design problem by making more design problems, honestly.

--Mike--
Visual C++ MVP Cool | :cool:

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Re: Using a non static member in a overloaded static member function

arunaas30-Jan-06 14:15

arunaas

30-Jan-06 14:15

Hi Mike

You are right. It is a design problem. I am trying to use the CDialogResize<t> WTL class as a base class. The static member function which I am trying to overload is GetDlgResizeMap() (Macro implemented)

I am deriving from CDialogResize<t> since I need to be able to make certain controls visible and some not visible at run time. Also, this was need to force paint on certain controls. The product was built using WTL. So, trying to use what is available and not trying to use new MFC or other classes.

If I just include the control as part of the macro map even though some of them are not visible(that actually implements the GetDlgresizeMap() function) CDialogResize does not understand that these controls are not visible and it starts trying to resize these which screws up the UI view. So, I need to manually either map these controls or not map them based on their visibility constraints.

So, I overloaded the #Define macro maps for BEGIN_DLGRESIZE_MAP and others to be able to map based on visibility constraints.

So, what else can I do? Please advise. Maybe , I can implement a new version of CDialogresize<t> from scratch....Do let me know your thoughts or comments...

By the way: Mike, your code snippets on the usage of CDialogResize<t> and other WTL classes were very helpful! Thanks for the same!

Regards
Aruna

which function can covert a hex string to value?

includeh1030-Jan-06 4:50

includeh10

30-Jan-06 4:50

such as:

UINT u=which_function_can_convert("FF00FF");

thx

A nice tool for optimizing your Microsoft html-help contents.

Includeh10

Re: which function can covert a hex string to value?

David Crow30-Jan-06 4:53

David Crow

30-Jan-06 4:53

Use strtoul().

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

Re: which function can covert a hex string to value?

Dominik Reichl30-Jan-06 4:56

Dominik Reichl

30-Jan-06 4:56

UINT u = strtoul("0xFF00FF", NULL, 16);

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

The swapping section in a puzzle game

eivanlo30-Jan-06 4:38

eivanlo

30-Jan-06 4:38

In a puzzle game, I dont know the size of the puzzle, how do I know the index number of the target element for swapping, at this moment I just know the index number of h is (hrow, hcol).

Am I wrong if I think this way?

e.g.

C | B
A | h

Assume the location of h at the keyboard is always on 5, then I hit 4 to swap h with A, hit 8 to swap B with h, and hit 7 to swap C with h.

For swapping A
tar_row = hrow;
tar_col = --hcol;

For swapping B
tar_row = --hrow;
tar_col = hcol;

For swapping C
tar_row = --hrow;
tar_col = --hcol;

Am I wrong?

Re: The swapping section in a puzzle game

Rage30-Jan-06 4:54

managing serial port interrupt

30-Jan-06 4:54

eivanlo wrote:
Am I wrong?

Maybe. However, to be completely sure, I would not rely on the operator -- precedence in an assignment, (such as tar_row = --hrow;), but take two steps to do it (tar_row = hrow; hrow--;)

~RaGE();

misturas30-Jan-06 4:32

misturas

30-Jan-06 4:32

Hi to all,
I made a deep search in this and other sites about serial communications management in Win32 (Win9X,2000,XP)
All the results leads to using ReadFile and the other file-style functions
But is any way to use interrupts (int of received char) on Windows?Must I create a device drivers?
Thanks to all
Cristian

Rage30-Jan-06 4:59

30-Jan-06 4:59

misturas wrote:
ReadFile

Mmmh .. .really ? What are you trying to achieve exactely ?

~RaGE();

Cedric Moonen30-Jan-06 6:24

Cedric Moonen

30-Jan-06 6:24

Yes, sure. What is the problem with that ? Reading and writing data on the serial port is done with ReadFile and WriteFile.

Rage30-Jan-06 6:43

30-Jan-06 6:43

Hi Cedric,

I was doubting the fact that ReadFile and WriteFile was the _only_ method provided to read/write data under Windows. Not that it does not work.

~RaGE();

Rage30-Jan-06 5:00

30-Jan-06 5:00

Ever considered using this:

http://www.codeproject.com/system/cserialport.asp[^]

~RaGE();

misturas30-Jan-06 5:06

misturas

30-Jan-06 5:06

I use Visual C++ 6.0 and I studied the article "Serial Communications in Win32" of msdn
My question is a question my boss made me I know it's not very easy to interact with hardware at low level on Windows and all the articles I found uses overlapped operation and ReadFile/WriteFile to read/write COM ports
Now in Italy is 6 p.m., so I have to leave office Poke tongue | ;-P

Sorry if I don't reply immediately
Thanks in advance Wink | ;)

Rage30-Jan-06 5:16

30-Jan-06 5:16

misturas wrote:
Now in Italy is 6 p.m

Really ? I am sitting in Germany, and it is still 5 p.m. Did not know that Germany had a different time than Italy.

As for serial communication, there are lots of wrappers that consider the serial port as a file with read/write operation. This is very handy for serial communication, but not for your purposes. I think what you are looking for is a way to get the hand when a serial interrupt is called (as we used to do under DOS or on microcontrollers). I think this should be feasible with the API I have provided you with, in this case you must get a Windows message as soon as something lands on the serial buffer.

~RaGE();

Cedric Moonen30-Jan-06 6:28

Cedric Moonen

30-Jan-06 6:28

Maybe it would help a lot if you describe exactly what you want to achieve. In general, reading and writing to a serial port can be done by several ways (specifically for reading). You can use a loop with timeouts (in a separate thread for example), ...
But if you want to really respond when there is an interuption, then you'll need to go for a device driver (and I suppose it must be tricky to do).

Anyway, even inside your driver, you will still have the problems of the real-time behavior, which is that Windows is not a real time operating system, so everything you want to achieve under the resolution of 10 msec (it can vary) is unfeasible.

Iain Clarke, Warrior Programmer

Iain Clarke, Warrior Programmer30-Jan-06 8:35

30-Jan-06 8:35

If you want to be notified on receipt of a char, you can use overlapped I/O with your read. That way an Event will be signalled any time you receive a character.

You could put a receive loop in a separate thread, anf then post each characted received with a resgistered window message.

The choices may not be endless, but they are several!

Iain.