C / C++ / MFC Discussion Boards

Re: waiting for a thread to finish creating

Daniel Turini20-Mar-02 1:49

20-Mar-02 1:49

As a rule of thumb, I would use an event object to signal the thread creation at start of ThreadProc, remove the Sleep and use a WaitForSingleObject.

750 ms is too much time to spend in some ocasions. But, if the machine is at 100% CPU, with lots of processes running in a slow machine, it may not be sufficient.

Crivo
Automated Credit Assessment

Re: waiting for a thread to finish creating

Carlos Antollini20-Mar-02 2:20

Carlos Antollini

20-Mar-02 2:20

Use waitforsingleobject or with the threadID you can Know the status of the Thread, of is is running or not....
But if CreateThread returns valid Handle is because the Thread was created.... Wink | ;)

Regards...

Carlos Antollini.
Sonork ID 100.10529 cantollini

Re: waiting for a thread to finish creating

Christopher Duncan20-Mar-02 3:18

Christopher Duncan

20-Mar-02 3:18

Carlos' comment is the way I'd approach it as well - if it returns a valid handle the thread is up and you can post the thread message. Sleep is an extremely bad idea because it's arbitrary timing that leaves you wide open to race conditions in multithreaded apps (and debugging race conditions is less fun than you ever want to have).

If you want to wait until other processing takes place in your thread proc before you post the thread message, then you can use the other technique suggested here of setting an event in the thread proc when you're ready, and using a call of WaitForSingleObject() after your call to CreateThread().

Chistopher Duncan
Author - The Career Programmer: Guerilla Tactics for an Imperfect World (Apress)

Re: waiting for a thread to finish creating

Tim Smith20-Mar-02 3:29

Tim Smith

20-Mar-02 3:29

The handle isn't signaled until the thread is terminated, not started.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Re: waiting for a thread to finish creating

Christopher Duncan20-Mar-02 3:34

Christopher Duncan

20-Mar-02 3:34

Tim Smith wrote:
The handle isn't signaled until the thread is terminated, not started.

Absolutely. I probably didn't word things properly - I had meant that, as Carlos mentioned, that if beginthread returned a valid handle (instead of 0) then the thread proc had started, not that you should block on the handle. In the second example I meant to indicate that you signalled an event in the thread proc (that you created via CreateEvent(), etc.) and blocked on this after creating the thread if you wanted more control.

It's early here, I clearly need more caffeine...

Chistopher Duncan
Author - The Career Programmer: Guerilla Tactics for an Imperfect World (Apress)

Re: waiting for a thread to finish creating

Tim Smith20-Mar-02 4:26

Tim Smith

20-Mar-02 4:26

It's early here, I clearly need more caffeine...

LOL, been there, done that. Smile | :)

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

how to add printer from VC++ ???

mits20-Mar-02 0:36

mits

20-Mar-02 0:36

Hi,
How do i can add printer like "add printer " from "control panel", i already have my own print driver, print processor. But i don't know how to add printer automatic ???
Please help me !!

Best regards,
mits

Never say "it's to late"

Re: how to add printer from VC++ ???

jerry0davis20-Mar-02 1:51

jerry0davis

20-Mar-02 1:51

I've never used this command before, so iI may be completely wrong but there is an AddPrinter command. Look for it on MSDN. Perhaps this is what you're looking for?

Jeremy Davis
http://www.astad.org

Re: how to add printer from VC++ ???

Carlos Antollini20-Mar-02 2:14

Carlos Antollini

20-Mar-02 2:14

Use the function

HANDLE AddPrinter(
  LPTSTR pName,     // pointer to server name
  DWORD Level,      // printer info. structure level
  LPBYTE pPrinter   // pointer to structure
);

Best Regards

Carlos Antollini.
Sonork ID 100.10529 cantollini

setting ole-object in focus(word/excel)

Atila20-Mar-02 0:02

Atila

20-Mar-02 0:02

I can't make my object get focus after clicking it while using normal view in word/excel.
Unlike in design view ,where u can resize the object....

OnInitDialog in VC7

Jason Hooper19-Mar-02 23:56

Jason Hooper

19-Mar-02 23:56

So. Like I was saying, the powers that be took away my precious, precious ClassWizard. It used to be quite easy to add an OnInitDialog to my About box, just by going to the message map in the ClassWizard and adding a functino for the predefined OnInitDialog.

What are the steps to take to add one now, with the VC7 MDE?

- Jason
Do you have a Pulse?
SonorkID: 100.611 Jason

Re: OnInitDialog in VC7

mits20-Mar-02 0:45

mits

20-Mar-02 0:45

In vc7, there's no class wizard !!! Vc7 manage classes, files... by properties. To handle message, override method, virtual method, simple right click in your classes then select properties. the properties dialog should appear and then you can select message tab, attribute tab, or method tab and select what you need !!!
Hope this helpful !!
Good luck !

Re: OnInitDialog in VC7

Christopher Duncan20-Mar-02 3:21

Christopher Duncan

20-Mar-02 3:21

mits wrote:
In vc7, there's no class wizard !!! Vc7 manage classes, files... by properties.

I haven't moved to VC7 yet, and I've heard a lot of noise about no class wizard, but from what you're saying, it sounds like we didn't lose any functionality in this regard - they just moved it to a different UI.

Would this be a correct statement?

Chistopher Duncan
Author - The Career Programmer: Guerilla Tactics for an Imperfect World (Apress)

Re: OnInitDialog in VC7

Tom Archer20-Mar-02 4:34

Tom Archer

20-Mar-02 4:34

Hmm. Yes and now. There are wizards for most things like creating classes and projects. Creating methods or event handlers however, is much easier without the wizard interface and a welcome change.

Cheers,
Tom Archer
Author, Inside C#
Best mini-putt score = 22

Re: OnInitDialog in VC7

Jason Hooper20-Mar-02 22:23

Jason Hooper

20-Mar-02 22:23

I've found this MSDN page* that helps us with the transition.

* opens in new win

- Jason
Do you have a Pulse?
SonorkID: 100.611 Jason

Veni, vidi, VC
- I came, I saw, Visual C

Re: OnInitDialog in VC7

Tom Archer21-Mar-02 2:18

Tom Archer

21-Mar-02 2:18

Great page, Jason. Thanks!

Cheers,
Tom Archer
Author, Inside C#

Re: OnInitDialog in VC7

mits21-Mar-02 2:36

mits

21-Mar-02 2:36

Yeah, you're right !!!
they just moved it to a diffrent UI.
I'm sorry !

Dead | X|

ISAPI Debugging

Tili19-Mar-02 23:52

Tili

19-Mar-02 23:52

I have been trying to debug my ISAPI extensions on Windows XP pro. But i cant get it work. When I try to use a method from a book it gives me error you dont have required previliges on Internet Explorer but if i use extension without debugging it works fine. Also I cannot get the attach to process method t odebug. Can someone help me out what is wrong. Attach to process just closes my project and opens inetinfo.opt. Can someone guide me step by step.

In my dream, I was dorwning my §orrow§
But my §orrow§, they learned to §wim

My own ListCtrl into CListView

19-Mar-02 23:17

How do you make to use a CListCtrlEx (my CListCtrl) with GetListCtrl into CListView?

Re: My own ListCtrl into CListView

Joaquín M López Muñoz19-Mar-02 23:41

Joaquín M López Muñoz

19-Mar-02 23:41

Something along m_yourListCtrlEx.SubclassWindow(GetListCtrl.Detach()) might work. Not 100% sure, though.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Need to remove buttons from a propertysheet

Hans Ruck19-Mar-02 23:20

Hans Ruck

19-Mar-02 23:20

i need to remove some buttons and to change some others from the predefined of a propertysheet mfc dialog.
it's possible by hooking somehow, but i think that it should exist an easyer way to accomplish this.

need some advice.

rechi

Re: Need to remove buttons from a propertysheet

Joaquín M López Muñoz19-Mar-02 23:30

Joaquín M López Muñoz

19-Mar-02 23:30

In CYourPropertySheet::OnInitDialog, GetDlgItem(IDOK) will give you a CWnd * you can use to manipulate the "Accept" button in any manner you please (similarly for IDCANCEL).

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Need to remove buttons from a propertysheet

Hans Ruck19-Mar-02 23:55

Hans Ruck

19-Mar-02 23:55

this is true, but i would like to change the dialog by simply setting some flags; for example, you can remove the 'accept' button this way:
dlgPropertySheet.m_psh.dwFlags |= PSH_NOAPPLYNOW
otherwise, the remaining buttons need to be rearranged and this sucks.

anyway, thanks!

rechi

gen. a HASH from MAC address

peterchen19-Mar-02 23:09

peterchen

19-Mar-02 23:09

Hi!
I need to create a 22-bit-Hash of some PC-specific ID. I though of UuidCreateSequential, and hash the MAC part of the generated ID.

Now I absolutely don't know what makes a good hash function. It doesn't need to be very fast, and not overly sensitive. Any suggestions or links?

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

From Hash functions I've seen, I've come up with the following:

take the last six bytes of the ID, and

long hash = 0;
for(i=10..15) {
  hash <<= 2;
  hash |= id_byte[i];
}

(which creates only 20 bits, but that's ok...)

TIA
Peter

Help with probably basic ASSERT

Jason Hooper19-Mar-02 22:59

Jason Hooper

19-Mar-02 22:59

I'm trying to fetch the user of this program's handle from a file when my SDI application loads. I have the following at the end of my CPuppyView::OnInitialUpdate():

if (!pDoc->LoadHandle())
{
	CHandleDlg dlgHandle;

	if (dlgHandle.DoModal() == IDOK)
	{
		CString h;

		dlgHandle.m_cHandle.GetWindowText(h.GetBuffer(65), 65);

		h.ReleaseBuffer();

		strncpy(pDoc->handle, h, 63);
	}
	else 
		return;

	pDoc->SaveHandle();
}

GetDlgItem(IDC_HANDLE)->SetWindowText(pDoc->handle);

Something about this code is ASSERTing, and it's rdiving me nuts. I'm pretty sure it's something to do with the CEdit control I'm using for CHandleDlg::m_cHandle (I know, I know, it sounds a bit like m_cHammer, but I'm pretty sure it's not that). I'm using the VC7 MDE which very sadistically doesn't have the ClassWizard I'm used to. So maybe I've added the CEdit control wrong? Or maybe I'm just missing something in that code that is very obviously wrong.

- Jason
Do you have a Pulse?
SonorkID: 100.611 Jason

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