Re: On selection a word in CEdit, which messages windows return? - C / C++ / MFC Discussion Boards

Re: Can I pass through a variable number of arguments to another function?

Luc Pattyn1-Nov-07 7:12

1-Nov-07 7:12

there is documentation and Google; among them they know the answer.
And you got some of the keywords already: va_list, va_start, stdarg, vsprintf, ...

Luc Pattyn [Forum Guidelines] [My Articles]

this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
- before you ask a question here, search CodeProject, then Google

Re: Can I pass through a variable number of arguments to another function?

C^hris L^osinger1-Nov-07 7:50

C^hris L^osinger

1-Nov-07 7:50

you can pass that va_list to other functions and iterate over the args there.

image processing toolkits | batch image processing

Re: Can I pass through a variable number of arguments to another function?

jp-mocs1-Nov-07 12:17

jp-mocs

1-Nov-07 12:17

Ok, I modified the csPrintf (the first one that passes the vars to the second) to look like this:

void cScreen::csPrintf(char *format, ...){
va_list argp;
char buffer[1024] = { 0 };

va_start( argp, format );

vsprintf_s( buffer, sizeof( buffer ), format, argp );

va_end(argp);

cScreenWindow tempWin = getWin(printWin);
tempWin.cswPrintf(buffer);

} // end of cScreen::csPrintf

This seems to work fine in most instances... curiously enough, it fails on one... calling csr.csPrintf(...) from the main routine looks like this:

csr.csPrintf("this is to test string function passthrough");
csr.csPrintf("char %c and int %d see if it works!", 'v', 10);
csr.csPrintf("string %s and hex %x see if it works!", "<test>", '\x00');
csr.csPrintf("test non-valid %y", 9);

The new routine above successfully calls tempWin.cswPrintf(buffer) in all instances except, curiously, the last. I have to think that the problem therefore lies in cswPrintf, except the debug keeps telling me it's in csPrintf. Oh well... wouldn't be the first time a computer lied to me...

Anyway, this (for the most part) works, and THAT was the main thing...

Thanks for the assist... I wanted to post to let you know it helped, and so anyone else reading could see how it wound out...

=->Mocs<-=

Re: Can I pass through a variable number of arguments to another function?

jp-mocs2-Nov-07 5:44

jp-mocs

2-Nov-07 5:44

Oh.. duh.. the vsprintf is integrating the args into the string, which isn't exactly what I was trying to do... I was TRYING to pass them streight through... but the overall goal was to have the cScreenWindow.cswPrintf print a formatted string called from the main program, so THAT is done.... overall, does what I want it to do, but doesn't answer how to pass the args along (should that ever become necessary)

But that's why it's failing on cScreen.csPrintf (which is where it is trying to integrate the bad token) and not in my routine (where I thought it was)

=->Mocs<-=

On selection a word in CEdit, which messages windows return?

Gofur Halmurat1-Nov-07 6:19

Gofur Halmurat

1-Nov-07 6:19

Hello,

On selection(Hignlighted, selected) a word in CEdit, does WINDOWS OS return any message? like Onselect or somethingelse?. How do we know which message WINDOWS OS return on any control? is there a tool to know them?

thanks

Re: On selection a word in CEdit, which messages windows return?

Maximilien1-Nov-07 6:23

Maximilien

1-Nov-07 6:23

Have a look at Spy++, it's a tool that should be installed with Visual Studio; it's used to spy messages (and other things) in an application.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: On selection a word in CEdit, which messages windows return?

Gofur Halmurat1-Nov-07 6:34

Gofur Halmurat

1-Nov-07 6:34

The Spy tool does not show what messages windows return on any control on a dialog,
it shows only window's messages,
is there a tool that i can see window's controls messages?

Re: On selection a word in CEdit, which messages windows return?

Mark Salsbery1-Nov-07 7:01

Mark Salsbery

1-Nov-07 7:01

Gofur Halmurat wrote:
How do we know which message WINDOWS OS return on any control?

I always keep a handy link to the control library documentation[^] (in
my online docs).

For each common control, there's a list of the messages and notifications.
For most controls, there's descriptions of how the control handles windows
messages as well.

For example, here's Edit Controls[^]

I wish I had them all memorized Smile | :)

Mark

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

Re: On selection a word in CEdit, which messages windows return?

Gofur Halmurat1-Nov-07 7:24

Gofur Halmurat

1-Nov-07 7:24

can i use like this?

<br />
BOOL CGetSelectedIETextDlg::PreTranslateMessage(MSG* pMsg) 	<br />
{<br />
if (pMsg->hwnd == GetDlgItem(IDC_EDIT1)->GetSafeHwnd() && pMsg->message == EN_CHANGE )<br />
{<br />
// some code <br />
}<br />
	return CDialog::PreTranslateMessage(pMsg);<br />
}<br />

or pMsg->message must be windows message, like WM_something?

Re: On selection a word in CEdit, which messages windows return?

Mark Salsbery1-Nov-07 7:54

Mark Salsbery

1-Nov-07 7:54

Gofur Halmurat wrote:
or pMsg->message must be windows message, like WM_something?

Yes. Edit control notifications are sent in WM_COMMAND messages.

When using MFC, I recommend using MFC event handling whenever possible.
That's a big benefit of MFC Smile | :)

You should generally only need to override
PreTranslateMessage() in special circumstances, when you absolutely have to
catch a message before it gets dispatched through MFC's message handling.

// add this to the class' message map
ON_EN_CHANGE(IDC_EDIT1, OnEditCtrlChange)
...
// add a handler method
void CGetSelectedIETextDlg::OnEditCtrlChange() 
{
    // do something when edit control text changes
}

I don't think EN_CHANGE is going to get sent when text is selected.
I could be wrong.

Mark

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

Re: On selection a word in CEdit, which messages windows return?

Gofur Halmurat1-Nov-07 9:29

Gofur Halmurat

1-Nov-07 9:29

Hello, I found out that it must be like this,
thanks for everyone

	if (pMsg->hwnd == GetDlgItem(IDC_EDIT1)->GetSafeHwnd() && pMsg->message == EN_KILLFOCUS  )<br />
	{<br />
<br />
<br />
// EN_CHANGE<br />
	int mm,nn;<br />
	CEdit *myedit;<br />
	CString sBuff;<br />
	myedit = (CEdit*)GetDlgItem(IDC_EDIT1);<br />
	myedit->GetSel(mm, nn); <br />
	myedit->GetWindowText(sBuff);<br />
	sBuff = sBuff.Mid(mm, nn - mm);<br />
	AfxMessage(sBuff)<br />
}<br />

Re: On selection a word in CEdit, which messages windows return?

Mark Salsbery1-Nov-07 10:51

Mark Salsbery

1-Nov-07 10:51

I guess as long as you get the desired result...

I just thought I'd mention...

EN_KILLFOCUS == WM_MOUSEMOVE == 0x0200

That means you're actually doing your processing (shown) on every
WM_MOUSEMOVE message.

Again, EN_xxx notifications come wrapped in WM_COMMAND messages.
They aren't messages themselves.

I also still wonder why bother using MFC if you're processing all messages
in PreTranslateMessage()...

Mark

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

Bandwidth Monitor

Alisdair Piercy1-Nov-07 5:25

Alisdair Piercy

1-Nov-07 5:25

I am currently writing a downloading application and I was wondering if anyone had come accross a simple example of monitoring the user apps connection to the network.

I am looking to show something like the bandwidth monitor in limewire in the bottom left corner of their download window.

Any help would be fantastic, I am writing my app in Visual C++.

Kind Regards.

Alisdair Piercy

Re: Bandwidth Monitor

led mike1-Nov-07 6:06

led mike

1-Nov-07 6:06

I have no idea what the limewire thing is or does, but if it's your application and you want to know what download rate you are getting and you have the number of bytes you received and the length of time to receive them then..... or am I missing something?

Re: Bandwidth Monitor

Alisdair Piercy1-Nov-07 6:10

Alisdair Piercy

1-Nov-07 6:10

Yeah I am already doing this calculation to see the download rate, the question I am looking into is to see what the actuall bandwidth connection is like.

E.G.

If the network is 10 Mbps connection how much of that does the app actually have etc to show current network connection strength.

Alisdair

Re: Bandwidth Monitor

led mike1-Nov-07 6:36

led mike

1-Nov-07 6:36

Alisdair Piercy wrote:
If the network is 10 Mbps connection

Well I am still not sure I understand what you want but may this[^] will be a lucky guess

unresolved external ... CInvalidArgException

bruccutler1-Nov-07 5:05

bruccutler

1-Nov-07 5:05

I'm adding exception handling to a C++ application and I get this error when I link.

What do I need to link with to resolve this external?

- BC

Re: unresolved external ... CInvalidArgException

led mike1-Nov-07 5:34

led mike

1-Nov-07 5:34

bruccutler wrote:
What do I need to link with to resolve this external?

I don't know, but if I was in your situation the first thing I would do is read the documentation for CInvalidArgException

Re: unresolved external ... CInvalidArgException

Chris Meech1-Nov-07 7:28

Chris Meech

1-Nov-07 7:28

Is it an MFC application?

Chris Meech
I am Canadian. [heard in a local bar]
Donate to help Conquer Cancer[^]

Re: unresolved external ... CInvalidArgException

bruccutler12-Nov-07 15:29

bruccutler

12-Nov-07 15:29

Yes, it is a C++/MFC application. There used to be an option to turn on Exception handling in the project file, but I can't find it.

a little code need to explain

youbo1-Nov-07 3:37

youbo

1-Nov-07 3:37

last time,one administrator of this forum tell me study C++ need to work by myself.i know.....and i can taste your angry gas.but some problem need to be solved,although it is a little problem.also i can't find a answer in the MSDN.
if you don't have time,please don't be care at me.if someone have love and time,please help me.the question is :
((WORD)(((BYTE)(a)) | ((WORD)((BYTE)(b))) << 8)) how do i understand it?

Re: a little code need to explain

chandu0041-Nov-07 3:50

chandu004

1-Nov-07 3:50

putting the byte b in msb and a in lsb of a word.
is not it?

Re: a little code need to explain

Matthew Faithfull1-Nov-07 4:11

Matthew Faithfull

1-Nov-07 4:11

The best way to understand code is usually to break it into smaller parts until they're simple enough to understand.

Let's see

<br />
( (WORD) ( <br />
( (BYTE)(a) ) | ( (WORD) ( (BYTE)(b) ) ) << 8 <br />
) ) <br />

which is like ((WORD)( x )) meaning cast x to a WORD (usually 2 byte integer type, check with sizeof(WORD); )
where x is
y | z << 8
where y is (a) cast to a BYTE (usually 8 bit unsigned) and z is b cast to a BYTE and then cast to a WORD.
Basically pair up the brakets and break down the expression into its parts, good luck Smile | :)

Nothing is exactly what it seems but everything with seems can be unpicked.

Re: a little code need to explain

youbo1-Nov-07 4:14

youbo

1-Nov-07 4:14

thanks for your chariness

Re: a little code need to explain

Chris Meech1-Nov-07 7:24

Chris Meech

1-Nov-07 7:24

youbo wrote:
chariness

I don't even want to know what that could mean. Smile | :)

Chris Meech
I am Canadian. [heard in a local bar]
Donate to help Conquer Cancer[^]

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