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How to check if a thread is Alive or not?.. ie CWinThread *cwt;
cwt->isAlive()?? nothing like that? . plz help
V
-- modifed at 13:01 Thursday 25th August, 2005
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You can pass the thread handle to GetExitCodeThread - it will return STILL_ACTIVE if the thread is alive.
He is smart. He will make our Windows go.
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See here.
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
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What I really like to do is using events. I usually create 3 handles, hStartup, hStopNow, hShutdown. I use hStartup for the thread to signify the thread started, hStopNow to signal the thread to stop (if it's needed) and hShutdown as the signal to acknowledge and that the thread has indeed stopped. I don't know if this is helpful or not depending on how you are actually using threads. This method lets me have more control in synchronizing the thread to my function. If data needs to be passed to the thread to be done, more handles are used to handoff data to and from the thread. I'll be willing to elaborate further here if you want, simply reply and ask for more information here.
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what does the method ExitInstance()'d actually do?
Thanks ,
V
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Hi,
I am working on an MDI application, and I want to add a progress dialog box to a member function of a class (which is generic). I used the ProgressDlg automatically created by Visual C++ components. It has a Create function (btw, it is not overwriting the CDialog Create), that looks like this:
<br />
BOOL CProgressDlg::Create(CWnd *pParent)<br />
{<br />
m_pParentWnd = CWnd::GetSafeOwner(pParent);<br />
<br />
<br />
if((m_pParentWnd!=NULL) && m_pParentWnd->IsWindowEnabled())<br />
{<br />
m_pParentWnd->EnableWindow(FALSE);<br />
m_bParentDisabled = TRUE;<br />
}<br />
<br />
if(!CDialog::Create(CG_IDS_PROGRESS_CAPTION,pParent))<br />
{<br />
ReEnableParent();<br />
return FALSE;<br />
}<br />
<br />
return TRUE;<br />
}<br />
I thought that it was fair to create this dialog with a NULL parent window. But its weird that the call to CWnd::GetSafeOwner(NULL) returns a valid parent window, and then the CDialog::Create crashes.
So, I tried passing AfxGetMainWnd() but that crashes too. Is it because I am in an MDI app??
Does anyone know how to successfully create an object of this derived CDialog class?
I would appreciate any help.
Thanks
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Have you stepped into CDialog::Create() to see exactly which statement is "crashing?"
When I make a modeless dialog, I use:
class CProgressDlg : public CDialog
{
public:
enum { IDD = IDD_PROGRESS_DIALOG };
virtual void PostNcDestroy();
};
CProgressDlg::CProgressDlg(CWnd* pParent)
: CDialog(CProgressDlg::IDD, pParent)
{
Create(IDD);
}
void CProgressDlg::PostNcDestroy()
{
delete this;
CDialog::PostNcDestroy();
}To use it:
CProgressDlg *pDlg = new CProgressDialog;
pDlg->ShowWindow(SW_SHOW);
pDlg->DestroyWindow(); Does that help?
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
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The assertion is caused when CWnd::CreateDlgIndirect(LPCDLGTEMPLATE lpDialogTemplate,
CWnd* pParentWnd, HINSTANCE hInst) is called and lpDialogTemplate is NULL.
<br />
CDialog::Create(LPCTSTR lpszTemplateName, CWnd* pParentWnd)<br />
{<br />
.....<br />
BOOL bResult = CreateIndirect(hTemplate, pParentWnd, hInst);<br />
<br />
}<br />
<br />
<br />
BOOL CDialog::CreateIndirect(HGLOBAL hDialogTemplate, CWnd* pParentWnd,<br />
HINSTANCE hInst)<br />
{<br />
ASSERT(hDialogTemplate != NULL);
<br />
LPCDLGTEMPLATE lpDialogTemplate = (LPCDLGTEMPLATE)LockResource(hDialogTemplate);<br />
BOOL bResult = CreateIndirect(lpDialogTemplate, pParentWnd, NULL, hInst);
UnlockResource(hDialogTemplate);<br />
<br />
return bResult;<br />
}<br />
<br />
<br />
BOOL CDialog::CreateIndirect(LPCDLGTEMPLATE lpDialogTemplate, CWnd* pParentWnd,<br />
void* lpDialogInit, HINSTANCE hInst)<br />
{<br />
ASSERT(lpDialogTemplate != NULL);<br />
<br />
if (pParentWnd == NULL)<br />
pParentWnd = AfxGetMainWnd();
m_lpDialogInit = lpDialogInit;
<br />
return CreateDlgIndirect(lpDialogTemplate, pParentWnd, hInst);<br />
}<br />
<br />
BOOL CWnd::CreateDlgIndirect(LPCDLGTEMPLATE lpDialogTemplate,<br />
CWnd* pParentWnd, HINSTANCE hInst)<br />
{<br />
ASSERT(lpDialogTemplate != NULL);<br />
....<br />
hWnd = ::CreateDialogIndirect(hInst, lpDialogTemplate,<br />
pParentWnd->GetSafeHwnd(), AfxDlgProc);
<br />
<br />
<br />
}<br />
<br />
Swati
-- modifed at 14:43 Thursday 25th August, 2005
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Further to your message, I'll restate the problem:
I am using a class CProgressDlg which is derived from CDialog. I am creating a modeless dialog in a generic class, so I use something like this:
CProgressDlg dlg;
dlg.Create(NULL);
where the Create function is as shown in the first email. This function throws an ASSERT failure. I think the problem is due to the fact that CDialog creates a dialog with parent wnd as AfxGetMainWnd() which returns a CMDIFrameWnd() as opposed to CMainFrame() in an SDI app. I have used this CProgressDlg class before in an SDI app and had no problems, and the only difference I can see is this.
Am I clearer now?
Swati
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C
swati24 wrote:
BOOL CWnd::CreateDlgIndirect(LPCDLGTEMPLATE lpDialogTemplate,
CWnd* pParentWnd, HINSTANCE hInst)
{
ASSERT(lpDialogTemplate != NULL);//ASSERTION FAILURE
....
}
Sorry I misquoted the above, lpDialogTemplate is not NULL.
BOOL CWnd::CreateDlgIndirect(LPCDLGTEMPLATE lpDialogTemplate,
CWnd* pParentWnd, HINSTANCE hInst)
{
....
hWnd = ::CreateDialogIndirect(hInst, lpDialogTemplate,
pParentWnd->GetSafeHwnd(), AfxDlgProc); //CAUSES ASSERTION FAILURE
//pParentWnd is not NULL
...
}
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Hi,
Firstly, yes it helps.
You see earlier I had this function called:
<br />
BOOL CProgressDlg::Create(CWnd* pParent)<br />
{<br />
CDialog::Create(CProgressDlg::IDD, pParent);<br />
}<br />
and this crashed when I did:
<br />
CProgressDlg* pDlg = new CProgressDlg();<br />
pDlg->Create(NULL);<br />
But now I got rid of Create function and added Create(IDD) in the constructor and it works. Do you know why?
Swati
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Hi,
The user have an ability to change a Windows font size and type(Display Properties/Apperance/Font Size: Normal, Extra Large, Large), and those changes affect my application fonts, dialog boxes, some controls, etc...
I just need an advice, what the best way to handle it in the GUI.
And another question.
Can I some how to preserve my application's default font(MS Sans Serif size 8) from overriding by Windows?
Thanks.
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Hi,
Does anyone know which sytem colour is used for the background of the task pane shown on the left hand edge of Windows Explorer windows in XP?
Thanks
Joel Holdsworth
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Not exactly. But you can use the Display applet's Appearance tab (rundll32 shell32.dll,Control_RunDLL desk.cpl,,2) in Control Panel and GetSysColor() to figure it out.
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
-- modifed at 14:02 Thursday 25th August, 2005
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Yeah that's the funny thing... I can't figure it out. I don't think I'm being stupid, but I can't find where this colour comes from! I think it comes from the theme itself somehow, but I'm not sure!
Joel Holdsworth
-- modified at 3:53 Friday 26th August, 2005
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Hello,
I am trying to build a download accelarator (a program which downloads a file through several connections to increase the speed).
I have created four threads. Each thread downloads the file from diffrent offset and finallly I join al this parts.
The problem is that when I use one thread( without changing the thread's code) it much faster. It like the additional threads are slowing one another.
In each thread I initialize the connection (CInternetSession->CHttpSession) and later in the thread I have put a loop which downloads the files.
The initialization part is in a critical section.
Can anyone tell whats wrong. Did anyone encountered similar problem?
Sincerely yours
Y.R.
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Y_R wrote:
It like the additional threads are slowing one another.
how many CPUs does your computer have ?
( for that matter, how many internet connections does it have ? )
Cleek | Image Toolkits | Thumbnail maker
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I have one cpu and one internet connection (750 k). But it should not matter because when one is downloading file from a server that is slow multiple http connections to this server will raise the overall speed like many existing download accelators(e.g. Get Right, DAP, etc..)
I think the problem is in my multithreading part.
Sincerely yours
Y.R.
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Hi there,
Does ne1 know what type of control is used in Skype chat for the Contacts?
How can i mimick it? ie. There is a name and when i click on it it expands revealing more details?
Thanks a million 
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Hey,
I'd like to print out a line create with
<br />
CPen pen(PS_DASHDOT,1,RGB(0,0,0))<br />
and MM_LOMETRIC MapMode.
When I look at the preview all works fine, but after printing there is a solid line on the paper.
What can I do?
Greetings
AnTri
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Hello All,
Does anybody know how to find out interfaces exposed by a driver (.sys file)?
Thanks in advance
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Hi all,
I am doing a project for uni which basically get images from a logitech quickcam pro 4000 camera, and the guy in our group who compiled our current software has stopped doing the subject and left us with a server/client package that streams the video fine, but encodes using H.263 mpeg encryption not MJPEG and i have absolutely no idea how to convert from one to the other. I found the library used for encryption that he wrote/borrowed and i was wondering if i could email this library to someone, then they tell me which parts to change and i could post the parts that need changing so others can see it as well, as i know that is the policy here, there is just too much code to display in the one message. Any help would be appreciated as I have been left in the deep end here.
regards,
Jordan
If you eat porridge every day you will get sick of it.
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Would it be of any benefit to look at the MJPEG format at www.wotsit.org[^]?
"One must learn from the bite of the fire to leave it alone." - Native American Proverb
-- modified at 10:42 Sunday 28th August, 2005
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I had a look at witsit.org and it said the page is under construction so i couldnt get any MJPEG information from there. Are there any other sites where i can see sample code of MJPEG implementations?
If you eat porridge every day you will get sick of it.
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