Re: Strange network speed question - C / C++ / MFC Discussion Boards

Michael Dunn13-Nov-03 8:09

13-Nov-03 8:09

Thread exit codes can be whatever you want. The fact that it's non-zero doesn't necessarily indicate an error, and in fact the return code of the main thread of a GUI app is generally not useful.

--Mike--
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WM_CTRLCOLOR

Alton Williams13-Nov-03 3:51

Alton Williams

13-Nov-03 3:51

Hi,
I've subclassed a an edit control from CEdit.
below is what's in the header file:

class CMyEdit: public CEdit<br />
{<br />
public:<br />
void ChangeColour(const unsigned long &bg, const unsigned long &fg);<br />
	// Generated message map functions<br />
protected:<br />
	//{{AFX_MSG(CEditEx)<br />
	afx_msg HBRUSH OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor);<br />
	//}}AFX_MSG<br />
<br />
	DECLARE_MESSAGE_MAP()<br />
private:<br />
	CBrush m_brush;<br />
	unsigned long TextColour;<br />
	unsigned long BKColour;<br />
	CFont m_TextFont;<br />
};<br />
<br />
}<br />

the methods in my C++ files are:

HBRUSH CMyEdit::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) <br />
{<br />
	HBRUSH hbr = CEdit::OnCtlColor(pDC, pWnd, nCtlColor);<br />
	<br />
	// TODO: Change any attributes of the DC here<br />
	pDC->SetTextColor(TextColour);<br />
	<br />
	// TODO: Return a different brush if the default is not desired<br />
	return m_brush;<br />
}<br />
<br />

void CMyEdit::ChangeColour(const unsigned long &fg, const unsigned long &bg)<br />
{<br />
	TextColour = fg;<br />
	BKColour = bg;<br />
	m_brush.DeleteObject();<br />
	m_brush.CreateSolidBrush(BKColour);<br />
	Invalidate();<br />

My problem is why the method OnCtlColor is NOT being called?
Any explanations

Thanks, Alton

Re: WM_CTRLCOLOR

Steve S13-Nov-03 4:29

Steve S

13-Nov-03 4:29

Have you set a reflection mapping up (ON_WM_CTLCOLOR_REFLECT) in the class's message map?

Steve S

positioning problem

ns13-Nov-03 3:45

13-Nov-03 3:45

In my Cdialog based class, I have three buttons arranged vertically and centered in the dialog at design time. I dont do anything special to the class when I run it. It shows up with the right side of the dialog larger than the left side, i.e. the buttons are no longer horizontally centered. I can I guess do a runtime positioning with MoveWindow etc but am wondering why this is happening. ANything short of runtime positioning I can do at designtime to fix this?
Thanks,
ns

Re: positioning problem

Ravi Bhavnani13-Nov-03 5:23

Ravi Bhavnani

13-Nov-03 5:23

ns wrote:
It shows up with the right side of the dialog larger than the left side,

That shouldn't happen. Windows won't move/align your controls by itself.

/ravi

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Re: How can I Enable Drag&Drop of IE URL's in my prog

Mike Dimmick13-Nov-03 3:34

Mike Dimmick

13-Nov-03 3:34

DragAcceptFiles is basically a legacy API - this is how Windows 3.1 File Manager used to indicate a file drop onto an application.

Explorer uses the full OLE drag-and-drop protocol. See Transferring Shell Objects with Drag-and-Drop and the Clipboard[^] for some basic information and pointers on how to register for OLE drag-and-drop.

Strange network speed question

Mathias S.13-Nov-03 3:09

Mathias S.

13-Nov-03 3:09

To start my internal net is 100mbit.

I need to read a lot of data ( couple of Gigs ) over the net very frequently.
So I need a program that copies the data and I want to go as fast as possible.

If I copy the files over FTP I get over 10MB/s in transfer speed and task manager shows network usage at 98-99% witch is really great. But I don’t want to use FTP.
I want to read the file from a network share.
And if I do, I only get like 6.5MB/sec so I made my test program to read/write threaded.
Triple buffers and read/write at the same time and stuff. And now I get like 7-7.5 MB (not much of a performance gain)
Anyway network usage only gets up to about 56-59% if I read from network share. I tried reading with different chunk sizes but did not make any difference.

If I copy the file with windows drag'n'drop I get also low speed but a little better, network usage of 62%

I understand that doing a lot of readfile(...) and stuff will generate more io request then receiving data over FTP. But should it really drop so much.

Anyone have any idea of why I can’t get close to 100% network usage when reading from a network share?

/Mathias

Re: Strange network speed question

valikac13-Nov-03 9:10

valikac

13-Nov-03 9:10

The problem depends on the design and implementation of the actual application.

Kuphryn

threads

snmail13-Nov-03 2:59

snmail

13-Nov-03 2:59

Hi.
The callback function is called when it receives some data. But it receives huge amount of data that requires a lot of time to copy. So I want to put this function to some thread. How to do this? I tried to inherit some class from CWinThread :
class MyThread : public CWinThread
{
.....
void SomeCallBack(...);
}

then MyThread m* = new MyThread; m->CreateThread();
but the thread creates and then completed. Why?
How to solwe my problem(how to create thread class that finished existence when I need)? Please, send example if it is possible.
Thankful in advance.

Re: threads

David Crow13-Nov-03 4:02

David Crow

13-Nov-03 4:02

snmail wrote:
but the thread creates and then completed. Why?

Does the newly created thread do anything? Just curious, but why aren't you using AfxBeginThread()?

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Re: threads

valikac13-Nov-03 9:11

valikac

13-Nov-03 9:11

There are several solutions including AfxBeginThread() and __beginthreadex(). Post the code in the thread. I suspect that the thread callback function does nothing and just returns.

Kuphryn

Automatic C++ class diagram generation?

Salvador Dali13-Nov-03 2:59

Salvador Dali

13-Nov-03 2:59

Is there a tool/software that will parse my existing C++ classes and produce a diagram (drawing) of the class/objects hierarchy?

Re: Automatic C++ class diagram generation?

FearlessBurner13-Nov-03 5:16

FearlessBurner

13-Nov-03 5:16

UML Studio from http://www.pragsoft.com/ is actually quite good. You are allowed to evaluate it before registering/paying too. However if I had VC7 with everything then I would use Visio.

Visio

dog_spawn13-Nov-03 5:17

dog_spawn

13-Nov-03 5:17

Visio does, but it's not free Smile | :)

Re: Automatic C++ class diagram generation?

Maximilien13-Nov-03 5:22

Maximilien

13-Nov-03 5:22

doxygen can do this.

http://www.stack.nl/~dimitri/doxygen/index.html[^]

Maximilien Lincourt
"Never underestimate the bandwidth of a station wagon filled with backup tapes." ("Computer Networks" by Andrew S Tannenbaum )

Re: Automatic C++ class diagram generation?

Ravi Bhavnani13-Nov-03 5:49

Ravi Bhavnani

13-Nov-03 5:49

Absolutely! Use Doxygen - it's fast, flexible, and free! It rocks! Cool | :cool:

/ravi

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Re: Automatic C++ class diagram generation?

Salvador Dali13-Nov-03 11:37

Salvador Dali

13-Nov-03 11:37

I was not very clear in my first post, so let me clarify here:

Say I have 4 classes, CBiggestObj, CBigObj, CSmallObj1 and CSmallObj2 and the code looks like this:

class CBiggestObj : public CDontCare
{
   CBigObj m_bigobj;
}

class CBigObj : public CWhatever
{
   CSmallObj1 m_obj1;
   CSmallObj2 *m_pobj2;
}

I need some software that will show me visually (with balloons and
arrows, like in a diagram) that CBiggestObj has a member CBigObj object and that CBigObj has 2 members, an object of CSmallObj1 and a pointer to a CSmallObj2. I don't need to know where the classes are inherited from.

Re: Automatic C++ class diagram generation?

Ravi Bhavnani13-Nov-03 12:50

Ravi Bhavnani

13-Nov-03 12:50

Yep, Doxygen will do that for you. Be sure to install the (free) Graphviz package that draws all the pretty diagrams.

/ravi

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Re: Automatic C++ class diagram generation?

Steve S13-Nov-03 22:06

Steve S

13-Nov-03 22:06

When you say Doxygen will do that for you, do you mean without any change to the source, so it can parse C++ declarations, or do you mean after you've manually inserted comments?

I suspect the original poster wants the former, rather than the latter.

Steve S

Re: Automatic C++ class diagram generation?

Ravi Bhavnani14-Nov-03 2:54

Ravi Bhavnani

14-Nov-03 2:54

Steve S wrote:
so it can parse C++ declarations,
Yep! It's tres cool!

We use it as part of our build process at work to generate class documentation (from manually inserted comments). Doxygen even generates a non-empty log file if it detects (to the best of its ability) invalid comments, which helps us keep our documentation honest.

/ravi

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ContextHelp button on dialog box

includeh1013-Nov-03 2:48

includeh10

13-Nov-03 2:48

i can't add context help button (WS_EX_CONTEXTHELP) on dialog box because min-box and max-box buttons have been added on the dialog.

do u known how to solve the request?
(that is: there are 4 buttons - close, min-box, max-box and context buttons - totally on the top-right corner of a dialog).

thx

includeh10

GDI+ // Newbie

Jorgen E.13-Nov-03 1:54

Jorgen E.

13-Nov-03 1:54

Hi,

I have a SDI app with a scrollview derived view class, which I try to paint using GDI+. So far so good. Previously, I used "old" GDI to draw, and simply took the scrolling into account by doing such as this:

<br />
CPoint where = GetDeviceScrollPosition();<br />
Pen penn(Color(0,0,0), REAL(width));<br />
pdc->DrawRectangle( &penn, rect.left - where.x, rect.top - where.y, rect.right - rect.left - where.x, rect.bottom - rect.top - where.y);<br />

Now, it seems like two things happen when I scroll. The old "drawing" moves up, like I want it to, and the view redraws itself, without regards to scrolling. In other words, as if I haven't scrolled anything yet.

If anyone can make any sense of this, please help me out!

newline in a buffer

styve13-Nov-03 1:46

styve

13-Nov-03 1:46

Hi!

I'm recieving a packet and saves it in my buffer. Then I will make i new line in the buffer so next packet information will be saved at a new line.

Can somebody help me please,
steve

Re: newline in a buffer

David Crow13-Nov-03 4:03

David Crow

13-Nov-03 4:03

styve wrote:
...saves it in my buffer.

How is the data being saved? What type is buffer?

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Reflection in c++

Ravi Jadhav13-Nov-03 1:33

Ravi Jadhav

13-Nov-03 1:33

Hi
I wanted to produce a mechanism like Reflection in c++ (without using dot net framework).can i do that..? How..? Is there any framework available to achieve this mechanism?

Or simple i will provide a class name in a string to a function that function will return me a new object of that class. is it possible in simple C++ (Not using MFC or dot net). If yes please let me know also.

Thanks in advance
Ravi

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