C / C++ / MFC Discussion Boards

Re: esy way to send email in win32 application

David Crow4-May-07 2:45

David Crow

4-May-07 2:45

See here and here.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Compile EVC++ 4.0 from command line [modified]

pri_skit3-May-07 21:41

pri_skit

3-May-07 21:41

I am new to eVC, I want to know how can I compile eVC++ project using NMAKE
or equivalent for eVC++ project.How can i write a batch file to do so?
thanks in advance.

-- modified at 3:50 Friday 4th May, 2007

priyank

SplitDialogTemplate() difference between VC6 and VC2005 Options

RaymondYounan3-May-07 20:54

RaymondYounan

3-May-07 20:54

Hello everybody,
I am actually migrating an existing project from VC6 to VC2005. I had a problem with an ActiveX component that wasn't loading at runtime, all other components were loading except the ActiveX. I dug in more and found out that the SplitDialogTemplate() function of the atlwin.h in VC6 differs a lot from the same function in VC2005.
In VC6 it copies all the components (OLE and non-OLE), while in VC2005 it only copies the non-OLE components. Does anyone know any turnaround that can help me load the ActiveX component?
This is the piece of the code that calls SplitDialogTemplate();

HGLOBAL hResource = LoadResource(hInstResource, hDlg); 
DLGTEMPLATE* pDlg = (DLGTEMPLATE*)LockResource(hResource); 

//Here it is only copying the non OLE components 
LPCDLGTEMPLATE lpDialogTemplate = SplitDialogTemplate(pDlg, pInitData); 

HINSTANCE hInst = _Module.GetModuleInstance(); 
nRet = ::DialogBoxIndirectParamA(hInst, lpDialogTemplate, hWndParent, 
pDialogProc, dwInitParam); 
if (lpDialogTemplate != pDlg) 
GlobalFree(GlobalHandle(lpDialogTemplate)); 
UnlockResource(hResource); 
FreeResource(hResource);

Thank you in advance,

Ray

Need little help in Worker threads [modified]

amitmistry_petlad 3-May-07 20:36

amitmistry_petlad

3-May-07 20:36

Hi!
In my application I am using multithreading.

for that I have used the loop.

HANDLE hThread[3];

<br />
for(int i=0;i<3;i++)<br />
{<br />
hThread[i]=(HANDLE)_beginthreadex(NULL, 0, &Thread ,l,NULL, &threadID);<br />
}<br />
<br />
<br />
unsigned __stdcall Thread(void* pArguments )<br />
{<br />
	HRESULT hr=NULL;<br />
	struct argument_list *Lparam= (argument_list *)pArguments ;<br />
	Package pkg;<br />
	threadID++;<br />
	<br />
	DWORD  dw=WaitForMultipleObjects(ListBoxItemCount,hThread,TRUE,5000 );									 <br />
							<br />
	switch (dw)<br />
	{	  						<br />
	  case WAIT_OBJECT_0 + 0:<br />
	  // a process with h[0] descriptor has exited							      								   <br />
	  hr=pkg.EncodeMediaContent(Lparam->pszInFile,Lparam->pszOutFil,Lparam->hwndParent,Lparam->Host,Lparam->UserID,Lparam->InitPackageRequest,Lparam->ScriptFile,Lparam->Port,Lparam->hList,Lparam->_ProtectSet,Lparam->hWndinoutfiledir,Lparam->hwndEncrypt);	<br />
	  break;<br />
<br />
	  case WAIT_OBJECT_0 + 1:<br />
	  // a process with h[1] descriptor has exited							      								   <br />
	  hr=pkg.EncodeMediaContent(Lparam->pszInFile,Lparam->pszOutFil,Lparam->hwndParent,Lparam->Host,Lparam->UserID,Lparam->InitPackageRequest,Lparam->ScriptFile,Lparam->Port,Lparam->hList,Lparam->_ProtectSet,Lparam->hWndinoutfiledir,Lparam->hwndEncrypt);	<br />
	  break;<br />
	<br />
	  case WAIT_OBJECT_0 + 2:<br />
	  // a process with h[2] descriptor has exited							      								   <br />
	  hr=pkg.EncodeMediaContent(Lparam->pszInFile,Lparam->pszOutFil,Lparam->hwndParent,Lparam->Host,Lparam->UserID,Lparam->InitPackageRequest,Lparam->ScriptFile,Lparam->Port,Lparam->hList,Lparam->_ProtectSet,Lparam->hWndinoutfiledir,Lparam->hwndEncrypt);	<br />
	  break;<br />
<br />
	  case WAIT_FAILED:<br />
	  // failure<br />
	  break;<br />
							<br />
	  case WAIT_TIMEOUT:<br />
	  // no processes exited during 5000ms<br />
	   break;<br />
	}	<br />
    //printf( "In second thread...\n" );    <br />
	if(hr==S_OK)<br />
	{	<br />
	MessageBox(0,L"thread gone finished" ,L"therad",0);<br />
	_endthreadex( 0 );    	<br />
	}<br />
	threadID--;<br />
	return 0;<br />
}

how these worker thread works and how they will run.

means ,how can i identified that which thread work at hThread[threadID/*it is Relevant with i */ ],

1)I have to wait/stop the main thread until the work threads finished his task.
2)when can all thread start. or will it start immidate at the loop time or first it will create all. then it start ?

becuse in my application when i debug some started with loop and some afterwards.

-- modified at 7:09 Friday 4th May, 2007

"Success lies not in the result , But in the efforts !!!!!"
Amit Mistry - petlad -Gujarat-India

Re: Need little help in Worker threads

Chilli714-May-07 0:52

Chilli71

4-May-07 0:52

Hi!

The threads are all created in the loop.
However they are created in a suspended state. The scheduler of the operating sytem will activate them (put them in running state) according to their priority and overall system load.
Usually this will be in the order you create the threads.

In prinzipal using a static (global) variable as a thread counter is a good idea.
But I strongly recommend to put the access to this variable into a critical section just for the case that the read and write operation (and whatever you will add in future) is not atomic.

Since the worker threads are identical clones it does not matter if the creation sequence would deviate from the sequence the threads start. However, if you want to know the creation sequence in the thread, you can just pass your loop index i as parameter.

kind regards
Leo

Re: Need little help in Worker threads

amitmistry_petlad 4-May-07 1:03

amitmistry_petlad

4-May-07 1:03

thanks !
but now i am in big confusion here.i have used array of handle right!
now runtime which handle will comes at which stage how can i know that?
becuse
hThread[0]=....
hThread[1]=....
hThread[2]=....
hThread[3]=....

and at WaitForMultipleObjects(ListBoxItemCount,hThread,TRUE,0);
we write only the base hThread address the how the thread identified. by system.

hThread[i], i think it was my wrong idea , because after then it gives me the constant handle error ,
anyways I just want to know why the above method fail.

"Success lies not in the result , But in the efforts !!!!!"
Amit Mistry - petlad -Gujarat-India

Re: Need little help in Worker threads

Chilli714-May-07 4:17

Chilli71

4-May-07 4:17

OK, I'm no specialist for WaitObject.
And I still do not understand what the code is intended for.
But lets start from the beginning.
You are creating 3 threads (thread 0 to thread 2)

While you have hardcoded the three in the loop index you use the variable ListBoxItemCount in the thread.
Looking at your previous answer you say hThread[0] ... hThread[3].
How much is ListBoxItemCount?
Because hThread[3] is never initialized.

In the way the code is now, it could happen that a task switch occurs in the thread starting loop, after one or two threads where created. In this case the Wait function must fail because not all thread handles in the list are initialized.

I understand that this is only a sample code to demonstrate your problem. But I have also doubts that you are going in the right direction. It is very likely, that if you change your design, the code that troubles you will disappear.

Greets
Leo

Re: Need little help in Worker threads

Roger Stoltz4-May-07 1:29

Roger Stoltz

4-May-07 1:29

Amit, please do not email me or anyone else directly asking for help.
I saw you've previously done so at least to brahmma earlier and twice to me today.

Chris Maunder wrote:

Everyone here helps because they enjoy helping others, not because it's their job.

in this[^] valuable post.

Regarding your threading problem, I have the following opinion:

amitmistry_petlad wrote:

1)I have to wait/stop the main thread until the work threads finished his task.

This implies that you've misunderstood the concept of multithreading since you're still doing things in serial. Spawning other threads is for doing things in parallel.
You have to re-evaluate your design.

I also suggest you read Joe Newcomer's article about worker threads here[^] before asking more questions. The article will help you understand the basics, asking the "right" questions in this forum and the answers you get will also make more sense to you.
The article refers to how to use MFC classes, but the concept of multithreading is still the same. You don't seem to be using MFC, but you haven't stated that clearly in any of your posts so I'm not really sure whether you use MFC or not.
I also advise you to read the other articles Joe refers to in his article about multithreading to get a more complete picture of the concept.
In my opinion, Newcomer's article explains the basics of multithreading better than any article I've found.

I really hope this helps you. Rose | [Rose]

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

Re: Need little help in Worker threads

amitmistry_petlad 4-May-07 1:38

amitmistry_petlad

4-May-07 1:38

Extremely Sorry ! Sigh | :sigh:

In future, I will take care .

"Success lies not in the result , But in the efforts !!!!!"
Amit Mistry - petlad -Gujarat-India

Finger print sensor with mfc

deeps_cute3-May-07 20:13

deeps_cute

3-May-07 20:13

i have to sense the finger print from a sensor and to generate a key for it. how to do this with mfc. pls help me

Arise Awake Stop Not Till ur Goal is Reached.