C / C++ / MFC

10-May-06 23:34

Hello everyone!My first post so i\m kinda nervous Poke tongue | ;-P

What's my problem:just started visual c++ and i'm trying hard to make a child window for my app(a single document made with app wizard ). I have some stuff happening in the main window and i want to be able to pop up a new window showing the status of some parameters from the main window and also to be able to control them from that second window. I would really appreciate a link or something to help me with this

Russell^'10-May-06 23:57

10-May-06 23:57

v3r50r wrote:
My first post

Wellcome

Open a new window could be a big problem if you have to initialize it, but if you want to understand how create a standard new window (in an MDI app) follow the sample code used in
CMDIFrameWnd::OnWindowNew() in winMDI.cpp
that create a copy of the current window.

void CMDIFrameWnd::OnWindowNew()<br />
{<br />
	CMDIChildWnd* pActiveChild = MDIGetActive();<br />
	CDocument* pDocument;<br />
	if (pActiveChild == NULL ||<br />
	  (pDocument = pActiveChild->GetActiveDocument()) == NULL)<br />
	{<br />
		TRACE(traceAppMsg, 0, "Warning: No active document for WindowNew command.\n");<br />
		AfxMessageBox(AFX_IDP_COMMAND_FAILURE);<br />
		return;     // command failed<br />
	}<br />
<br />
	// otherwise we have a new frame !<br />
	CDocTemplate* pTemplate = pDocument->GetDocTemplate();<br />
	ASSERT_VALID(pTemplate);<br />
	CFrameWnd* pFrame = pTemplate->CreateNewFrame(pDocument, pActiveChild);<br />
	if (pFrame == NULL)<br />
	{<br />
		TRACE(traceAppMsg, 0, "Warning: failed to create new frame.\n");<br />
		return;     // command failed<br />
	}<br />
<br />
	pTemplate->InitialUpdateFrame(pFrame, pDocument);<br />
}

v3r50r11-May-06 0:01

11-May-06 0:01

well..it's like this:all i want to do is to press a control(button) on my app a dialog to appear saying:parameter1 is:...(from first form ).thank tou and i'll look the MDI up ( i suppose that's multi document something right? Big Grin | :-D

)

Cedric Moonen11-May-06 0:05

Cedric Moonen

11-May-06 0:05

v3r50r wrote:
all i want to do is to press a control(button) on my app a dialog to appear saying:parameter1 is

Then you should create a dialog template (through the resource editor), then create the associated class. Then, on the button function handler, create an instance of this class and call DoModal.
If you want to pass some parameters, then add a new function in the class (that receives the data) and use these parameters in OnInitdialog. This new function is called before you call DoModal.

v3r50r11-May-06 0:13

11-May-06 0:13

ok i thonk i got it thank you
btw,what does DoModal() do?
and how do i

Cedric Moonen wrote:
add a new function in the class (that receives the data)

receive the data? I mean, if say i have in the main frame's class an int data;
and then it's initializrd in the application by say data=10; how do i write the function on the new dialog that gives me data's value?

Cedric Moonen11-May-06 0:56

Cedric Moonen

11-May-06 0:56

You only need to show some parameters value in a string for example ? Then it is much easier to go for a simple MessageBox.

Here is how you can do that (let's say that you want to show the values of Param1 and Param2 wich are both integers):

char szString[255];
sprintf(szString,"Value of Param1: %i, Value of Param2: %i",Param1,Param2);
MessageBox(szString);

(I suppose you put this code in a class derived from CWnd).

Take a look at the doc of sprintf[^] for more details.

Russell^'11-May-06 0:05

11-May-06 0:05

mmm

then you need this:

<br />
CString String;<br />
int N=5;<br />
String.Format("parameter1 is: %d", N);<br />
AfxMessageBox(String);<br />

v3r50r11-May-06 0:07

11-May-06 0:07

wouldn't that print out : parameter 1 is=5 ?
i need the real value of param 1

Russell^'11-May-06 0:17

charset for the current language OS.

11-May-06 0:17

Take a look on this sample project
http://www.codeproject.com/editctrl/txtentry.asp[^]

Here the input value are strings, but you could understand the steps to build your input dialog.

Sandeep. Vaidya10-May-06 23:33

Sandeep. Vaidya

10-May-06 23:33

Do we have any SDK to get the charset for the current language OS?

I have an application which will dyanmically generate the html file and display. I have a requirement where if I am displaying the html in the Japanese OS, I should mention japanese charset in the content info of HTML file.
Thanks in advance.
Sandeep

Serial Port interrupt

aasstt10-May-06 22:55

aasstt

10-May-06 22:55

My application is reading data from serial port. But the data may arrive at any random time. So i want to interrupt the application when data arrives on the serial port. Can anybody suggest me some solution to this problem.

aasstt

Cedric Moonen10-May-06 23:02

Cedric Moonen

10-May-06 23:02

You won't be able to use hardware interruptions in your program (and it's bad design also Poke tongue | ;-P

). A better solution is in general to spawn a thread that will poll the serial port for data. A good design for doing that is starting this thread in a separate class that will send a message to your application when data is available (custom message). This may sound 'complicated' but if you don't want to freeze your GUI, it is the best way of doing that.

Maxwell Chen10-May-06 23:34

Maxwell Chen

10-May-06 23:34

Cedric Moonen wrote:
to spawn a thread that will poll the serial port for data.

From my experience in the past, polling eats processor resource even though we have added something in the loop in the thread like Sleep(1).

Personally I prefer to feed an event to the serial port API, and use WaitForMultipleObjects or WaitForSingleObject ... Big Grin | :-D

Cedric Moonen wrote:
This may sound 'complicated' but if you don't want to freeze your GUI, it is the best way of doing that.

Yes this is so true! Basically all those communication related applications have to be designed in multi-threading to prevent from GUI frozen.

Maxwell Chen

kakan11-May-06 0:37

kakan

11-May-06 0:37

Use Overlapped I/O and WaitForSingleObject

ThatsAlok11-May-06 19:52

ThatsAlok

11-May-06 19:52

http://www.codeproject.com/system/simpleserialcomm.asp
http://www.codeproject.com/system/cserialport.asp

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Russell^'10-May-06 23:03

10-May-06 23:03

Is pTmpl initialized? In your example there isn't any init.

if yes what about pTmpl->UpdateAllViews(NULL); ?;)

Hamid_RT11-May-06 0:16

Hamid_RT

11-May-06 0:16

Now again question is hide Smile | :)

Russell^'11-May-06 0:29

11-May-06 0:29

I hope that the author isn't desappeared like the message (and that my resp solved his problem;))

Hamid_RT11-May-06 0:34

Hamid_RT

11-May-06 0:34

me too

Get a child window?

see me10-May-06 22:33

see me

10-May-06 22:33

How can i understand the child window which i got is of child dialog?

i did this to get the child.
CWnd* pWnd = GetWindow( GW_CHILD );

i want to know if pWnd is of child dialog?

ajeesh c v

Russell^'10-May-06 23:09

10-May-06 23:09

I'm not sure that I understand your question, but I think that if you want to know what kind of object is pointing pWnd you could use
if(! pWnd ->IsKindOf(RUNTIME_CLASS(CChildClassName))){;)
//Error
}else{
...
}

Hamid_RT10-May-06 23:11

Hamid_RT

10-May-06 23:11

Hope I understood your question
see IsChild[^]
and CWnd::IsChild

see me11-May-06 0:45

see me

11-May-06 0:45

i got the child window using CWnd* pWnd = GetWindow( GW_CHILD );

but the pWnd i got is of the edit control of the parent dialog.

i need to get only the pWnd of child dialog and not of child controls.

ajeesh

Russell^'11-May-06 2:06