CAsyncSocket usage - C / C++ / MFC Discussion Boards

Re: Inline Assembler Macros?

Ryan Binns15-Jul-03 0:48

Ryan Binns

15-Jul-03 0:48

The __asm is its own separator, so __asm mov ax,0 __asm mov bx,0 is perfectly valid code.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: Inline Assembler Macros?

TheSurrealist15-Jul-03 0:00

TheSurrealist

15-Jul-03 0:00

Hi,

Did you try:

#define TestMacro2(x) { _asm mov eax, 0 _asm mov ebx, 0 }

or even

#define TestMacro2(x) { \
_asm mov eax, 0 \
_asm mov ebx, 0 \
}

Both of the above should work - note the surrounding braces {} are not necessary but are there to make the code look prettier. Smile | :)

HTH

--------------------------------------------

"The mere act of drinking beer in an attempt to measure your tolerance is likely to affect your impression of how many beers you've drunk."

-- The Heineken uncertainty principle.

about using OpenDriver()

gdzfy14-Jul-03 16:27

gdzfy

14-Jul-03 16:27

see:
http://www.codeproject.com/script/comments/forums.asp?msg=550923&forumid=1647#xx550923xx

and

http://www.codeproject.com/script/comments/forums.asp?msg=549039&forumid=1647#xx549039xx
now my test result is :
the clean app works, but the clean DLL does not.

a good man

CPropertySheet Apply button disabled

haritadala14-Jul-03 13:55

haritadala

14-Jul-03 13:55

Hello all

I'm coding an application using CPropertySheet and adding some property pages to this property sheet. The problem the Apply button by default is disabled, is there any way to enable it for all the property pages contained in the property sheet.

If any one knows how to do it, pls help me.

thanks for your time.
Hari.

Re: CPropertySheet Apply button disabled

Andrew Walker14-Jul-03 15:03

Andrew Walker

14-Jul-03 15:03

From my copy of MSDN

CPropertyPage::SetModified() Call to activate or deactivate the Apply Now button.

If you can keep you head when all about you
Are losing theirs and blaming it on you;
If you can dream - and not make dreams your master;
If you can think - and not make thoughts you aim;
Yours is the Earth and everything that's in it.

Rudyard Kipling

Re: CPropertySheet Apply button disabled

haritadala15-Jul-03 2:30

haritadala

15-Jul-03 2:30

Hi Andrew

Thanks for the reply. Now the Apply button is activated whenever I change any of the Page properties.

Thanks for answering my question.

Hari.

Re: CPropertySheet Apply button disabled

Andrew Walker15-Jul-03 2:32

Andrew Walker

15-Jul-03 2:32

That's ok.

Smile | :)

CAsyncSocket usage

caustiK14-Jul-03 11:50

caustiK

14-Jul-03 11:50

i need to send a UDP broadcast message to a network of sensors, and i'm trying to use the CAsyncSocket class. the sensors are accepting text string commands on port 7000. here's the code:

<br />
int errorCode;<br />
<br />
if (!m_udpSocket.Create(0, SOCK_DGRAM))<br />
{<br />
     AfxMessageBox("Create Error");<br />
     errorCode = GetLastError();<br />
}<br />
<br />
// xxxxx is the command<br />
if (m_udpSocket.SendTo("xxxxx", sizeof("xxxxx"), 7000) == SOCKET_ERROR)<br />
{<br />
     AfxMessageBox("Send Error");<br />
     errorCode = GetLastError();<br />
}<br />
<br />
m_udpSocket.Close();<br />

the Create() function is working, but SendTo() gives me an error. the errorCode is 0, but this doesn't seem to match any of the winsock codes on MSDN. am i missing something or leaving something out? i don't know much about networking, but i have to use UDP and the sensors don't support CArchives so i can't use CSocket. any help is greatly appreciated!
(p.s. -- if there is a syntax error or something, it's probably just my typing - i don't have my hands on the actual code atm.)

Re: CAsyncSocket usage

User 665814-Jul-03 12:41

User 6658

14-Jul-03 12:41

replace sizeof("xxxxx") with strlen("xxxxx"), and if it still doesn't work try to put this line before SendTo().

int on = 1, optlen = sizeof(on);
m_udpSocket.SetSockOpt(SO_BROADCAST,&on,optlen);

regards

modified 12-Sep-18 21:01pm.

Re: CAsyncSocket usage

caustiK15-Jul-03 3:02

caustiK

15-Jul-03 3:02

thanks, that answered my question perfectly! Smile | :)

Re: Another Question

caustiK15-Jul-03 10:56

caustiK

15-Jul-03 10:56

i'm having the same problem now with a tcp send.

<br />
if (Connect(host, 9000) == SOCKET_ERROR)<br />
{<br />
AfxMessageBox("Error Connecting");<br />
errorCode = GetLastError();<br />
}<br />
if (Send(command, command.GetLength()) == SOCKET_ERROR)<br />
{<br />
AfxMessageBox("Error Sending Packet");<br />
errorCode = GetLastError();<br />
}<br />

the Connect() seems to work, but i get an error sending. again, the errorCode is 0. is there another option i need to set? thanks, again.

A dll question

dzenan14-Jul-03 11:35

dzenan

14-Jul-03 11:35

Hi,
i'm developing this app using MFC now i want to store some functions(MFC),controls(MFC) ect. in a dll,
i have 2 options
Regular DLL using shared MFC or MFC extension DLL

wich is better to use and what is the difference beetwen them,
thanks

~dzenan~

Re: A dll question

Cambalindo14-Jul-03 17:52

Cambalindo

14-Jul-03 17:52

Hi:
Regular DLL: Allows you to use any MFC classes and functions, but you can only exports "C" functions.
MFC extension DLL: Allows you to export Classes that you can derive from in your client app.
hope it helps
regards

Daniel Cespedes

"There are 10 types of people, those who understand binary and those who do not"
"Santa Cruz de la Sierra Paraiso Terrenal!"

daniel.cespedes@ieee.org

Re: A dll question

dzenan14-Jul-03 23:35

dzenan

14-Jul-03 23:35

Thanks, that's the answer i was lookig for. Smile | :)

~dzenan~

WaitForSingleObject

act_x14-Jul-03 9:59

act_x

14-Jul-03 9:59

I have a COm framework where I have two classes A and B that service requests based on their respective queues .

for e.g life Sequence for Class A is as follows :

1.Class A object created

2.AddedToQueue_A event created as nonSignalled .

3.Worker thread within Class A created .

4.CLass A QUEUE is empty hence Worker thread is blocked with the call:

ResetEvent(AddedToQueue_A)<br />
WaitForSingleObject(AddedToQueue_A,INFINITE);

5. When a request is added to Queue(Enqueue) a call is made to awaken the thread like :
SetEvent(AddedtoQueue_A);

6. Thread A is awakened and the request is serviced .

Similar is the case of Class B object

Observations :
1. With Class A object present and when there is no Class B object the thread is awakened properly and the queue is serviced .

2. With Class A and CLass B objects present , the observation is that though an entry is added to the Queue of class A , Class A thread is not getting awakened everytime for some reason .the thread gets awakened every alternated time when the Queue size =2;
My question is that is the blocking statement
WaitForsingleObject() associated with the thread priority . Why isnt Class A's thread being called everytime I Set the event while enqueuing ?

Re: WaitForSingleObject

Joaquín M López Muñoz14-Jul-03 10:14

Joaquín M López Muñoz

14-Jul-03 10:14

I don't entirely get your design, but I guess it doesn't matter, because:

ResetEvent(AddedToQueue_A)
WaitForSingleObject(AddedToQueue_A,INFINITE);

is fundamentally flawed. Let me explain. Suppose a request is enqueued into A when worker thread A is servicing a prior request and before it has completed to do so. When the worker thread fininshes, it resumes waiting, but before that it calls ResetEvent(AddedToQueue_A): the signal is lost and the thread sits here waiting for ever (or until another request with more lucky timing gets in).
Instead, create AddedtoQueue_A as automatic (see the docs for CreateEvent) and do not use ResetEvent. Good luck.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: WaitForSingleObject

act_x14-Jul-03 10:29

act_x

14-Jul-03 10:29

Thank you for your insight .
I made the modification but still find that my thread (Class A)gets awakened every alternate request (i.e Queuesize=2) . This behaviour is absent when the other thread of class B is absent .

here is a snippet of my thread operation

while(threadNeedstorun){<br />
       if(queueSize>0){<br />
       //Service Queue<br />
       }<br />
       // Block <br />
       WaitForSingleObject(AddedtoQueue_A,INFINITE)<br />
       // Awake <br />
  }<br />
<br />
here is the snippet of my Enqueue operation <br />
<br />
    if(queueSize<MAX_QUE_SIZE){<br />
<br />
       array[(head+queueSize)%MAX_QUE_SIZE]=newVal;<br />
       queueSize++;<br />
<br />
      SetEvent(AddedtoQueue_A) <br />
    }<br />

Re: WaitForSingleObject

Joaquín M López Muñoz14-Jul-03 11:22

Joaquín M López Muñoz

14-Jul-03 11:22

OK, this kind of stuff is always somewhat messy. Try this. Define a CRITICAL_SECTION, say CS_A (don't forget to initialize it with InitializeCriticalSection), create AddedtoQueue_A as manual and use the following for incrementing and decrementing the number of elements in the queue:

void DecrementElementsInA()
{
  EnterCriticalSection(CS_A);
  --queueSize;
  if(queueSize==0){
    ResetEvent(AddedtoQueue_A);
  }
  LeaveCriticalSection(CS_A);
}

IncrementElementsInA()
{
  EnterCriticalSection(CS_A);
  ++queueSize;
  if(queueSize>0){
    SetEvent(AddedtoQueue_A);
  }
  LeaveCriticalSection(CS_A);
}

Think this sould do. Please report back, regards,

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: WaitForSingleObject

JT Anderson15-Jul-03 7:54

JT Anderson

15-Jul-03 7:54

I may be making a rash statement here, but this looks like a job for a semaphore, rather than an event.

Create a semaphore with an initial count of 0 and a huge max count (LONG_MAX or something like that). Each time a writer puts something in the queue, it calls ReleaseSemaphore. The reader(s) wait on the semaphore and remove one item from the queue each time they wake up.

--------
There are 10 types of people in this world. Those who know binary and those who don't.

How to pop up a window

Shay Harel14-Jul-03 9:49

Shay Harel

14-Jul-03 9:49

Hi,

I was told to run these lines of code in order to instantiate a class I have that is derived from CFrameWnd (CLogViewFrame):

<br />
	CRuntimeClass* pRuntimeClass = RUNTIME_CLASS( CLogViewFrame );<br />
	CObject* pObject = pRuntimeClass->CreateObject();<br />
	ASSERT( pObject->IsKindOf( RUNTIME_CLASS( CLogViewFrame ) ) );<br />

It compiles nice, but now, how do I access my class, how do I reach it's methods ? Non of the pointer created, can lead me to my class.

Shay

Re: How to pop up a window

PJ Arends14-Jul-03 10:04

PJ Arends

14-Jul-03 10:04

pObject points to your class, you just have to type cast it.

CLogViewFrame *pLogViewFrame = dynamic_cast<CLogViewFrame *>(pObject);
ASSERT (pLogViewFrame);

Untested code.

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

Re: How to pop up a window

Shay Harel14-Jul-03 10:07

Shay Harel

14-Jul-03 10:07

Cooooooolllllllll !!!

thanks !

How to add dll to a VC++.NET project?

mr200314-Jul-03 9:33

mr2003

14-Jul-03 9:33

Hi,
I have a VB ActiveX DLL, how can I add it to my VC++ project?

Its very easy in the 6.0 version, but I have trouble with .NET !!

Ehsan Behboudi

List box won't scroll ......

Shay Harel14-Jul-03 8:22

Shay Harel

14-Jul-03 8:22

Hi,

Whe I used my CListBox on a dialog and wanted to scroll it programatically, I used:

<br />
//pivot is the index of the line I want to show in the middle<br />
list_box.SetAnchorIndex (pivot+18);//18 line forward from the top<br />
list_box.SetSel (pivot-1);<br />
<br />
<br />

But when I used CListBox as a view inside a CFrameWnd it does not work anymore, it always shows the selected line at the top.

???????????/

Shay

Re: List box won't scroll ......

Shay Harel14-Jul-03 8:29

Shay Harel

14-Jul-03 8:29

OK OK
I found it alone,

Apperantly the SetSel, scroll the view back to the top.
So what I did was to swap between the commands and now it all works

Good for me

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.