How to reflect the variable changing in one class file to another class file..

Question

0.00/5 (No votes)

See more:

Hi Im writing socket appliction,where server is sending data for every two seconds.

At client side it is a SDI application where the data received need to be plotted as graph.

so Im receiving data at CSockEt_Client::OnReceive()

But how can i reflect on CClientView::OnDraw(CDC *pDC)
to Plot Graph..?
At Server

C++

while(1)
		{
			for(int i=0;i<col;i++)
			{
						Sleep(2000);
				
					fdata.w1=a[i][0];
					fdata.w2=a[i][1];
					fdata.w3=a[i][2];
					fdata.w4=a[i][3];
					                                  m_server.m_client.Send(&fdata,sizeof(fdata));

			}

At Client side

C++

void CClient_Socket::OnReceive(int nErrorCode) 
{	filedata fdata;
	
		int br=Receive(&fdata,sizeof(fdata));
                w[0]=fdata.w1;
		w[1]=fdata.w2;
		w[2]=fdata.w3;
		w[3]=fdata.w4;
CSocket::OnReceive(nErrorCode);
}

C++

void CClient_graphView::OnDraw(CDC* dc)
{
	CClient_graphDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	m_Graph->DrawGraph(dc);							          							     m_Graph->AddPoint(dc, w[0]);
}

so in what way i need to declare int w[i]... either static,extern...?

please help me out..

Thanks in advance..

Posted 5-Dec-12 0:33am

hiiakiia

Updated 5-Dec-12 0:53am

v3

Add a Solution

2 solutions

Solution 1

CDocument::UpdateAllViews()[^].

Posted 5-Dec-12 0:36am

Richard MacCutchan

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard MacCutchan · Accepted Answer · 2012-12-05T02:51:00

Solution 2

In a SDI application the document class should hold all your data, so the points of the graph will be stored there, probably as some sort of class variable (array, list, vector etc). Then in your drawing code you use that data to draw the part of your picture that fits the visible portion of your window (allowing for scrolling etc.). The call to CDocument::UpdateAllViews() ensures that your window is repainted after the document's contents have been modified.

Posted 5-Dec-12 2:51am

Richard MacCutchan

Comments

hiiakiia 5-Dec-12 23:57pm

Thank u for ur reply..
I tried it.. Declared a array in Doc Class using Document object i accessed that array.. in OnDraw i called UpdateAllViews (NULL);
But there is no change it is not reflecting the array changes that are being done on
Onreceive()
Here is sample bit of code:
d_var is Doc class object;
m_Graph->DrawGraph(dc);
m_Graph->AddPoint(dc, d_var.m_GValue[i]);
d_var.UpdateAllViews(NULL);

at OnReceive()

d_var.m_GValue[0]=fdata.w1;
d_var.m_GValue[1]=fdata.w2;
d_var.m_GValue[2]=fdata.w3;
d_var.m_GValue[3]fdata.w4;

can u give sample code as example ..

Richard MacCutchan 6-Dec-12 3:15am

You are only saving four points, and then overwriting them on the next receive. You need to save all the points that you receive; remember, every time OnDraw() is called it redraws the entire window.

hiiakiia 6-Dec-12 3:55am

Those four are values for four different graphs.. for each 2 sec a value is received from server and it need to be added to the previous.. so now i need to add each point and need to draw the graph...
is it right...!
will UpdateAllViews (NULL) will call OnDraw function again and again..?

hiiakiia 6-Dec-12 8:01am

Thank U Mr.Richard .. I Got the graph..
But after few sec it is crashing ...!

while debugging im unable to trace the reason .. is there other way to trace it...

Richard MacCutchan 6-Dec-12 8:42am

Without knowing what the code is doing or where the crash occurs it is impossible to make any guesses. You could try adding some simple debug statements and see how far it gets before crashing.

hiiakiia 10-Dec-12 0:30am

Thank u Mr. Richard.. I traced it.. Its a small mistake array limit exceeded..!
Once thing can we dynamically increase array size?
Since data is receiving for every minute.. so after some time it may exceed the limit and crashes so any solution for it..?

Richard MacCutchan 10-Dec-12 3:48am

You can dynamically resize arrays but it involves a bit of work copying the data around. It would be much easier to use a STL vector as described in: http://msdn.microsoft.com/en-us/library/9xd04bzs(VS.71).aspx.

hiiakiia 10-Dec-12 5:54am

Thank u Very much Mr.Richard . The application is working good...
Thanks for ur suggestion..