C / C++ / MFC Discussion Boards

Mark Salsbery26-Nov-07 8:38

26-Nov-07 8:38

Yes, almost. For threads that wait for periods of time, like doing device I/O,
there can be an advantage having more threads since during those
I/O waits other threads can get some work done.

It's something that has to be tuned depending on what the threads are or
can be doing, available resources, etc.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

How to Use Own User Intrface in TWAIN (SDI)

Shivarudrayya H22-Nov-07 17:53

Shivarudrayya H

22-Nov-07 17:53

Hi Friends,
Im using TWAIN in my application(SDI) to capture the image using digital camera.
I dont want to use the Sources UI. So I want to use my own UI for preview. ie:View as my UI.

Plz anybody help me..

Thanks in advance,

Reagards
Shiva

Re: How to Use Own User Intrface in TWAIN (SDI)

Mark Salsbery23-Nov-07 5:43

Mark Salsbery

23-Nov-07 5:43

Have you studied the "Alternative User Interfaces" section of the TWAIN Specification?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How to Use Own User Intrface in TWAIN (SDI)

Shivarudrayya H25-Nov-07 17:04

Shivarudrayya H

25-Nov-07 17:04

Ya Mark,
But im exactly not gettting how to implement it.
can u halp me..?

Reagards
Shiva

.ico replaced, 32*32 icon changed, 16*16 not changed, why

followait22-Nov-07 17:50

followait

22-Nov-07 17:50

I worked out the .ico file use "Axialis IconWorkshop", with 2 icons in.
One is (16*16 256), the other is (32*32 256).
ID is IDR_MAINFRAME.
When I run the program, the icon in the about dialog has been replaced with the new one. But the icon where the system menu hasn't been replaced. Why?

Re: .ico replaced, 32*32 icon changed, 16*16 not changed, why

Hamid_RT22-Nov-07 19:23

Hamid_RT

22-Nov-07 19:23

Did you use of SetIcon(hIcon,True); and SetIcon(hIcon,False); ?

Re: .ico replaced, 32*32 icon changed, 16*16 not changed, why

followait24-Nov-07 15:58

followait

24-Nov-07 15:58

I set it after LoadFrame, it's ok now, thanks.

Re: .ico replaced, 32*32 icon changed, 16*16 not changed, why

Hamid_RT26-Nov-07 19:24

Hamid_RT

26-Nov-07 19:24

I gald you could solve it.;)

Re: .ico replaced, 32*32 icon changed, 16*16 not changed, why

Iain Clarke, Warrior Programmer23-Nov-07 5:51

Iain Clarke, Warrior Programmer

23-Nov-07 5:51

Is it possible this is an MDI/SDI app, and it's using the documents icon for the system menu, rather than your IDR_MAINFRAME one?

Iain.

Re: .ico replaced, 32*32 icon changed, 16*16 not changed, why

followait24-Nov-07 16:12

followait

24-Nov-07 16:12

surely

I set it manually, it's ok now, thanks.

Dynamic generation of server controls in asp.net 2.0

ysunil_7422-Nov-07 17:22

ysunil_74

22-Nov-07 17:22

I have to generate a web page with dynamic controls with data coming from database.Depending upon control type coming from database i have to create a control in the web page and assign value to it which comes from database. web control values also comes from database.Could any body can help me in this.

Re: Dynamic generation of server controls in asp.net 2.0

Hamid_RT22-Nov-07 19:30

Hamid_RT

22-Nov-07 19:30

You have some values of your database and know you want to read them and eneter to web controls,whats problem? does IHTMLDocument* helpful for you?

Read serial port at high baud rate

Guo_yt22-Nov-07 16:03

Guo_yt

22-Nov-07 16:03

Hello everyone,

I wrote a program to read GPS sentence from Serial Port of an PDA, the code works well at low baudrate,for example 4800. But when I Transfer it to an heigh speed device baudrate at 38400 it does not work.
I have already found the problem lays at the flowing code:

if(ClearCommError(port->m_hComm,&errCode,&comState) == TRUE)
result = ReadFile(port->m_hComm,m_readbuf,comState.cbInQue,&nLength,NULL);

comState.cbInQue always return 0, so ReadFile reads nothing.

Does anyone know any reason to this problem? thanks

Re: Read serial port at high baud rate

KarstenK22-Nov-07 20:38

KarstenK

22-Nov-07 20:38

COM-Ports often are very "individual" in timing. Try wait funtion or change some settings.

Supports the PDA this data rate?

Greetings from Germany

Re: Read serial port at high baud rate

kakan22-Nov-07 21:30

kakan

22-Nov-07 21:30

You have to use overlapped IO when you are using serial ports. And handling overlapped IO can be rather difficult.
There are quite a few articles about serial comm here at CP.
Use the code from one of them, they all use overlapped IO.

Alcohol. The cause of, and the solution to, all of life's problems - Homer Simpson

Re: Read serial port at high baud rate

Roger Stoltz22-Nov-07 22:03

Roger Stoltz

22-Nov-07 22:03

First, you have to make sure that the PDA device supports the baudrate you're trying to use like KarstenK suggested.

Second, you should really use overlapped I/O (asynchronous), as kakan also suggested for many reasons.
One reason that may not be so obvious is that any code you post may seem all right at a glance, but suffers from timing issues since it is supposed to be synchronous which makes it hard for us to help you. When you're not using overlapped I/O, the serial port driver can only complete one IRP at a time, which means that while you're blocking on a read operation you cannot issue a write operation.
Read this article[^] to get started with overlapped I/O.

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

Re: Read serial port at high baud rate

Guo_yt25-Nov-07 0:29

Guo_yt

25-Nov-07 0:29

Thank you all.

Sorry I forgot to tell the target operating system is WM5.0, and as I know it doesn't support Overlapped IO for Serial port. Please inform me if it's not correct.

The parameters to Set up the com is right, and if i change my code like this, it works all right
if(ClearCommError(port->m_hComm,&errCode,&comState) == TRUE)
result = ReadFile(port->m_hComm,m_readbuf,512,&nLength,NULL);

So, I'm wondering why comState.cbInQue equals 0 while It is fine at low baud rate

Tabbing Order in Dialogs

Bram van Kampen22-Nov-07 15:50

Bram van Kampen

22-Nov-07 15:50

Is it possible to Dynamically change the Tabbing order in a Dialog When It is actually Excecuting.

D'Oh! | :doh:

Bram van Kampen

Re: Tabbing Order in Dialogs [modified]

Nibu babu thomas22-Nov-07 16:13

Nibu babu thomas

22-Nov-07 16:13

Bram van Kampen wrote:
Is it possible to Dynamically change the Tabbing order in a Dialog When It is actually Excecuting.

Use SetWindowPos without specifying SWP_NOZORDER. The hwndInsertAfter parameter decides which control precedes this control of yours in the tabbing order. Look up MSDN on SetWindowPos and hwndInsertAfter.

Nibu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http:\\nibuthomas.wordpress.com

Re: Tabbing Order in Dialogs

Bram van Kampen22-Nov-07 16:53

Bram van Kampen

22-Nov-07 16:53

Get the Gist, Could you give a Minuscule Example of what and where,

Regards Blush | :O

Bram van Kampen

Re: Tabbing Order in Dialogs

Nibu babu thomas22-Nov-07 17:33

Nibu babu thomas

22-Nov-07 17:33

Bram van Kampen wrote:
Could you give a Minuscule Example of what and where,

Sure!

Follow these steps...

Add two buttons to a fresh dialog in a sequencial order, IDC_BUTTON1 and IDC_BUTTON2

Goto OnInitDialog(you are not restricted to OnInitDialog, you can also do this on a button click) and paste this line of code

GetDlgItem( IDC_BUTTON1 )->SetWindowPos( GetDlgItem( IDC_BUTTON2 ), 
0, 0, 0, 0, 
SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE );

So now run the dialog and you will see that the focus is on the second button i.e. IDC_BUTTON2, I am invoking SetWindowPos on IDC_BUTTON1 and hwndInsertAfter is IDC_BUTTON2 hence IDC_BUTTON1 is moved down in the ZOrder after IDC_BUTTON2.

So this is how we dynamically change the Z-Order or tab order.

Nibu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http:\\nibuthomas.wordpress.com

Re: Tabbing Order in Dialogs

Bram van Kampen23-Nov-07 1:15

Bram van Kampen

23-Nov-07 1:15

Got it in One,

Thanx a Lot Smile | :)