Re: update controls based on other inputs - C / C++ / MFC Discussion Boards

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Re: How do i use a CString in a non-MFC app?

John M. Drescher6-Jun-02 6:08

John M. Drescher

6-Jun-02 6:08

Unless you are using WTL you can't, because the MFC version of CString requires some MFC Internals. There is a WTL version but this requires you to use ATL and WTL.

John

Re: How do i use a CString in a non-MFC app?

Ramon Casellas6-Jun-02 6:20

Ramon Casellas

6-Jun-02 6:20

VC NET

Use ATL::CString
#include <atlstr.h>

In VC 6, you can use WTL::CString if you download WTL, but the class in WTL 3.1 was not incredibly good.

Regards,
R.

Re: How do i use a CString in a non-MFC app?

Rage6-Jun-02 6:21

Rage

6-Jun-02 6:21

Sorry, seems that the rest of my post got lost Frown | :(

... OK, Ramon gave you the right thing ...

~RaGE();

Re: How do i use a CString in a non-MFC app?

6-Jun-02 7:17

Why not use stl string. its much better than the CString and feature rich. Easy o use. If u r unsure why not peek into "Thinking in C++" by Bruce Eckel Vol 2. @ mindview.net Blush | :O

update controls based on other inputs

jimNLX6-Jun-02 5:33

jimNLX

6-Jun-02 5:33

I have a popup keypad for numbers and would like to have the number added to a edit control for display as it is typed and then return the number on clicking ok.

I can't seem to get the number to show in the edit control.

I thought there was an article on this but couldn't find it.

Any help would be very much appriciated.

Thanks,

Re: update controls based on other inputs

Rage6-Jun-02 6:16

Rage

6-Jun-02 6:16

Source sample, please ?

~RaGE();

Re: update controls based on other inputs

jimNLX6-Jun-02 7:54

jimNLX

6-Jun-02 7:54

Not sure that I can give enough source to make sence. So I'll try and explain with a short example:

Dialog app. user clicks edit box and a dialog appears with a button and an edit box. The user clicks the button and every time a one is added to a temp array and the new number is displayed in the edit box. On exit the number is returned to the first click edit box.

Number should look like 11111. But in the real app there are 10 buttons plus other functions to act on the number present. Much like a calculator.

Thanks for trying to understand. Hope this helps.

Re: update controls based on other inputs

Rage6-Jun-02 8:21

Rage

6-Jun-02 8:21

OK: It does not sound very complicated...

First, draw your dialog and create a class associated to it, let´s name it CKeypadDlg. If you are already lost, mail back Big Grin | :-D

Add a member

int * m_Response

Then overload the DoModal function like this :

int CKeypadDlg::DoModal(int *response)
{
m_Response=response;
return CDialog::DoModal()
}

declare a CString in your KeypadDLg:

CString m_Result

On your second dialog box, you should have a control associated to your CEditBox (let´s name it m_EditCtrl).

When the user clicks on button 1 for instance you will have to catch it in a OnButton... function - Double Click on the Button in the Dialog, and you´ll get :

void CKeypadDlg::OnButton1()
{
   m_Result+="1";
   m_EditCtrl.SetWindowText((LPCTSTR)(LPTSTR)(m_Result))
}

Same code for all button ...

To get the current result at any moment

int Result_i=_atoi(m_Result);

Finally, override OnOk() with

void CKeypadDlg::OnOK() 
{
	*m_Response=_atoi(m_Result);
	CDialog::OnOK();
}

Oufff ...

use it ike this :

CKeypadDlg myDlg
int final_result=0;
myDlg.DoModal(final_result);
//And here you get the result once the dialog is closed ...

Hope this helps ...

~RaGE();

How do i use IShellFolder::ParseDisplayName correctly?

redeemer6-Jun-02 5:25

redeemer

6-Jun-02 5:25

Not sure how to use it, it always returns "The parameter is incorrect." when the return value is interpreted with the Error Lookup.

Thanks!

DSP Boards

Brian Azzopardi6-Jun-02 4:39

Brian Azzopardi

6-Jun-02 4:39

Hi all,

Any programmer here who has experience with using DSP boards? As I'm not a hardware guy I'm looking for something coder-friendly. Any suggestions would be welcome Smile | :)

Re: DSP Boards

Roger Allen6-Jun-02 4:37

Roger Allen

6-Jun-02 4:37

I used a DSP56001 board many years ago. (Like when the 186 was the top dog). It was good and easy to use at that time, considering I hadn't done my programming degree at that time. (that makes it 12 years ago OMG | :OMG:

)

Sorry if I can't be more help.

Roger Allen
Sonork 100.10016

If I had a quote, it would be a very good one.

Re: DSP Boards

Brian Azzopardi6-Jun-02 4:52

Brian Azzopardi

6-Jun-02 4:52

10x Roger.

Any idea anyone where I can get benchmarks/performance figures. Ideally I'd like to know whether the bang/buck of a DSP compared to a 2Ghz AMD is better, etc and any pitfalls. I couldn't find any perf data on the Texas Instruments site.

close view but leave document open

Gary Kirkham6-Jun-02 4:28

Gary Kirkham

6-Jun-02 4:28

I have am writting an MDI Doc/View app and have a situation where I would like to be able to close a view (there is only one view and it is derived from CScrollView) and leave the document open...then, sometime later, create a new view and attach it to the still open document.

How do I do this?

Re: close view but leave document open

Tomasz Sowinski6-Jun-02 4:35

Tomasz Sowinski

6-Jun-02 4:35

To avoid deeper hacking, I'd create a 'dummy' frame/view and hide it. So technically a view would exist - but user would be unaware about that.

Tomasz Sowinski -- http://www.shooltz.com

- It's for protection
- Protection from what? Zee Germans?

Re: close view but leave document open

Gary Kirkham6-Jun-02 4:49

Gary Kirkham

6-Jun-02 4:49

Thanks for replying...I thought about that, but there can be many documents/views being opened and closed and if they are not really closed (only inactive), the inactive views continue to receive OnUpdate messages. I am worried about a possible performance hit...It seems that it would be cleaner to close the view, but leave the document open.

Re: close view but leave document open

Tomasz Sowinski6-Jun-02 4:52

Tomasz Sowinski

6-Jun-02 4:52

Gary Kirkham wrote:
I am worried about a possible performance hit...

Well, the dummy view would be just a class derived from CView which ignores OnUpdate calls.

You may also try to dabble with undocumented CDocument::m_bAutoDelete. Probably if you set it to FALSE closing last view will not destroy document. I've never played this trick personally, however.

Tomasz Sowinski -- http://www.shooltz.com

- It's for protection
- Protection from what? Zee Germans?

Re: close view but leave document open

Gary Kirkham6-Jun-02 15:37

Gary Kirkham

6-Jun-02 15:37

Never mind I figured it out...you gave me part of the answer (m_bAutoDelete)

Thanks

Cool | :cool:

Empty document on SDI App

6-Jun-02 3:51

At the begining of Application SDI, I want a Empty Document but when I write this code :
// no empty document window on startup
if (cmdInfo.m_nShellCommand == CCommandLineInfo::FileNew) {
cmdInfo.m_nShellCommand = CCommandLineInfo::FileNothing;
}
on App::InitInstance(), it doesn't work ...
Please Help me !

Re: Empty document on SDI App

Tomasz Sowinski6-Jun-02 4:10

Tomasz Sowinski

6-Jun-02 4:10

Check this link:

http://www.microsoft.com/msj/defaulttop.asp?page=/msj/archive/s204d.htm

Tomasz Sowinski -- http://www.shooltz.com

- It's for protection
- Protection from what? Zee Germans?

Synchronization problem (how do I make it read-only?)

6-Jun-02 3:11

Hey all,

I have a shared resource in my application. I want to allow all running threads to READ from that resource simultaneously, but want them all to block when the resource is being WRITTEN to.

I know there's a standard technique to do that, but I can't remember it, and I have no idea what keywords I should use in the search engines (I do recall that this problem has a formal name).

Thanks!

Re: Synchronization problem (how do I make it read-only?)

6-Jun-02 3:19

MRSW lock (Multi-reader, single writer). You can find a decent implementation at http://www.quality.nu/dotnetguy/2001/21/10.aspx.

Code to change data from Big Endian to Little Endian

JMajors986-Jun-02 3:19

JMajors98

6-Jun-02 3:19

Hello,
I am trying to read a binary file written on a big endian machine(SGI) and read it on my little endian(PC). Does anyone have code or any thoughts on how to do the byte conversion? I would appreciate and help I can get. Thank you for your time.

Josh

Dead | X|

Re: Code to change data from Big Endian to Little Endian

6-Jun-02 3:16

I think you should be able to use ntoh* functions to do the switch, since network order is big endian.

Re: Code to change data from Big Endian to Little Endian

Joaquín M López Muñoz6-Jun-02 3:46

Joaquín M López Muñoz

6-Jun-02 3:46

This should work:

template <typename T> T change_endian(T in)
{
  T out;
  char *pin=reinterpret_cast<char *>(&in);
  char *pout=reinterpret_cast<char *>(&out)+sizeof(T);
  for(size_t n=0;n<sizeof(T);++n)*--pout=*pin++;
  return out;
}

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

using SAFEARRAY

RaphaelBr6-Jun-02 2:24

RaphaelBr

6-Jun-02 2:24

Hi, I am using a OCX component, this component return to me a SAFEARRAY Pointer, I am sending this array using a CAsyncSocket component .. like this:

SAFEARRAY **psa;
psa = Data->pparray;
m_UDPSocket.Send((*psa)->pvData, (*psa)-rgsabound[0].cElements);

And I get in the other side like this:

int hr;
SAFEARRAY psa;
BYTE pdata[MAX_BUFFER];

psa.pvData = pdata;
psa.cDims = 1;
psa.cbElements = 1;
psa.cLocks = 1;
psa.fFeatures = FADF_FIXEDSIZE | FADF_AUTO | FADF_EMBEDDED | FADF_STATIC
psa.rgsabound[0].lLbound = 0;
psa.rgsabound[0].cElements = hr;

it´s work well ... but I need to send 2 bits together, I need to represent the number 1 (01), or 2 (10), or 3(00), I want to represent what kind of data I am sending using the Socket. How can I link the array with this 2 bits ?

Thanks a lot

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