C / C++ / MFC

11-Jul-07 0:23

I've got a Wizard Form where i create controls in runtime.

I need to attach the reference of a String/double variable to a control. This variables exists in another class. so when the Wizard finishes, i iterate through all the controls and each control updates it's own referenced varaible. In .NET i used the Control.Tag property (is of type Object - that was easy). Want to do the same in C++ but the Control->Tag is of int type. D'Oh! | :doh:

Im missing something. Help me to convert the parameter Value:

<br />
void ExcuteWizard(..., AnsiString &Value)<br />
{<br />
TTextbox ctrl = new ....;<br />
<br />
ctrl->Tag = Value;   //<< how do i convert the Value parameter?<br />
<br />
}<br />
void FinnishWizard()<br />
{<br />
  for each control{<br />
      ((&AnsiString)Control->Tag) = Control->Text; //<<and now back to the refrence type?<br />
  }<br />
}<br />

Have someone a theory or explanation with regards to pointer and reference conversions?

Thanks.

InOut.NET11-Jul-07 2:44

11-Jul-07 2:44

Please guys!

Ok at least how do i translate a integer that is a address e.g. 1247075 to the original AnsiString variable refrence?

CPallini11-Jul-07 3:38

11-Jul-07 3:38

you may use a pointer instead of a reference, provided you Tag property ha a compatible size.
Smile | :)

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.

InOut.NET11-Jul-07 7:41

11-Jul-07 7:41

Compile Error:
Cannot convert 'AnsiString*' to 'int'

I don't understand :

CPallini wrote:
Tag property ha a compatible size.

It's a int-type - one size.

CPallini11-Jul-07 21:48

11-Jul-07 21:48

InOut.NET wrote:
Compile Error:
Cannot convert 'AnsiString*' to 'int'

What compiler are you using?

InOut.NET wrote:
I don't understand :

CPallini wrote:
Tag property ha a compatible size.

It's a int-type - one size.

if sizeof(int) is the same of sizeof(AnsiString*) then conversion should be possible (and allowed). If the condition above doesn't hold you can use the int value as index of a array of pointers (i.e. adding a level of indirection).

Smile | :)

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.

InOut.NET12-Jul-07 0:43

12-Jul-07 0:43

Builder C++ 2006

Yeah i used Tag = (int)AnsiString*
I could not get the int address from the Tag back to AnsiString*.

I decided to ditch AnsiString* and go for a struct* with a few AnsiSting in it.
All work so much easier. I think theres something about the AnsiString type that I don;t understand.

Thanks for your help.

CPallini12-Jul-07 0:58

How to set unicode build in VS.net 2005?

12-Jul-07 0:58

InOut.NET wrote:
I decided to ditch AnsiString* and go for a struct* with a few AnsiSting in it.

Probably the struct * will give you the same sort of problem the AnsiString * gave (I hope the countrary, of course).
Smile | :)

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.

Peter, Chan11-Jul-07 0:14

Peter, Chan

11-Jul-07 0:14

How to set unicode build in VS.net 2005?

Re: How to set unicode build in VS.net 2005?

Sam_c11-Jul-07 0:31

Sam_c

11-Jul-07 0:31

project-> properties -> configuration properties -> character Set

(3rd option from the bottom)

Detect FIREWIRE Device

VC_RYK10-Jul-07 22:33

VC_RYK

10-Jul-07 22:33

Hi Guys
I want to detect device arrival on FIREWIRE Port.so how will i go for that.
some sample code is appreciable.

With Regards
RYK

Re: Detect FIREWIRE Device

ksrameshkanth12-Jul-07 21:43

ksrameshkanth

12-Jul-07 21:43

Hi,
I am not sure about FIREWIRE, But generally device detect can be found by using the message ON_WM_DEVICECHANGE(). Also refer the following link
http://www.codeproject.com/system/HwDetect.asp

Regards,
Rameshkanth
BORN TO WIN

need a similar function as "getchar()"

bloodwinner10-Jul-07 22:01

bloodwinner

10-Jul-07 22:01

if I am using getchar(), then the execution of the program will stop here if no input is given.

could someone help me figure out if there is another way? Aim: while any input is given, save it to a variable, if not, keep on executing program without stop.

I have used multithread, but it did not work well when I put it running at background.

I am using C

InOut.NET10-Jul-07 22:18

10-Jul-07 22:18

I don't think there is a function that 'does not wait for input'.

bloodwinner10-Jul-07 22:31

bloodwinner

10-Jul-07 22:31

not necessarily a single function, but with the usage: keep program running, while accept the input if any

CPallini10-Jul-07 22:38