C / C++ / MFC

Re: How to check whether particular thread is running or not

11-Apr-07 21:29

You can use GetExitCodeThread[^]. If the value returned by the thread is STILL_ACTIVE, then your thread is still running.

Cédric Moonen
Software developer

Charting control [v1.1]

neha.agarwal2711-Apr-07 21:54

neha.agarwal27

11-Apr-07 21:54

i have made a sdi application in that i have made a listctrl.

Now i have made ui thread, for checking out that particular thread is running or not i have written this code

std::map<int, CPingThread*>  assocsping;
void CHttp::StopThread(int key)
{
std::map<int, CPingThread*>::iterator pos = assocsping.find(pingkey);
if(pos != assocsping.end())
{
pos->second
CPingThread* pThread = pos->second;
pThread->PostThreadMessage(WM_QUIT,NULL,NULL);
}
}

now how can i do this thing when using worker thread

please help me

Re: How to check whether particular thread is running or not

Cedric Moonen11-Apr-07 23:01

Re: How to check whether particular thread is running or not

11-Apr-07 23:01

I suppose (but it was not clear) that CPingThread is a class that inherits from CWinThread and that it implements the thread function ?
CWinThread has a public member m_hThread (see here[^] ). You can pass this handle to the function (as explained in my previous post)

Cédric Moonen
Software developer

Charting control [v1.1]

Stephen Hewitt12-Apr-07 1:55

Stephen Hewitt

12-Apr-07 1:55

This is not a good way to check if a thread has exited. Here’s what MSDN has to say on this issue:

Warning: If a thread happens to return STILL_ACTIVE (259) as an error code, applications that test for this value could end up in an infinite loop.

Here's how you do it without such dangers:

if (WaitForSingleObject(hThread, 0)==WAIT_OBJECT_0)
{
	// Thread has exited.
}

Don't forget to close the thread handle when you're done with it.

Steve

programing for usb port

mahdiehIR11-Apr-07 21:17

mahdiehIR

11-Apr-07 21:17

i need some information about programing for usb port

Re: programing for usb port

Hamid_RT11-Apr-07 21:32

Re: programing for usb port

11-Apr-07 21:32

Ok see here[^] for some info and also wikipedia has some good info here[^]

WhiteSky

Cedric Moonen11-Apr-07 21:33

11-Apr-07 21:33

mahieh wrote:
i need some information about programing for usb port

Open the driver associated with the USB device withe the CreateFile function and then you can use ReadFile or WriteFile to read or write data. You can also use DeviceIOControl to exchange driver specific commands.

Cédric Moonen
Software developer

Charting control [v1.1]

Visual C++

PREETIGUPTA11-Apr-07 21:08

PREETIGUPTA

11-Apr-07 21:08

I want to calculate the mode(statistics) of the data items stored in vector

Re: Visual C++

Cedric Moonen11-Apr-07 21:19

11-Apr-07 21:19

PREETIGUPTA wrote:
the mode(statistics)

What do you mean by mode exactly ? (I don't remember having learned something like that in statistic...)

PREETIGUPTA wrote:
data items

What kind of data ?

PREETIGUPTA wrote:
in vector

A std::vector ? Or a plain C++ array ?

Also, try to use a relevant title. I don't really see how your question is related to Visual C++ (or, yes, I see but in that case ALL questions could have the same title).

Cédric Moonen
Software developer

Charting control [v1.1]

Re: Visual C++

markkuk11-Apr-07 23:09

markkuk

11-Apr-07 23:09

Cedric Moonen wrote:
PREETIGUPTA wrote:
the mode(statistics)

What do you mean by mode exactly ? (I don't remember having learned something like that in statistic...)

He means this:
Mode (statistics)[^]
If the vector contains discrete values (integers), then the problem is just to find the most commonly occurring value.

color

p_11-Apr-07 20:49

11-Apr-07 20:49

hi all good day Rose | [Rose]

can anybody tell me how to change the color of dialog box in MFC
using menu option
thnaks
Rose | [Rose]

Re: color

Hamid_RT11-Apr-07 21:09

11-Apr-07 21:09

See WM_CTLCOLOR message

WhiteSky

Re: color

p_11-Apr-07 22:05

11-Apr-07 22:05

thanks a lot sir

Re: color

Hamid_RT12-Apr-07 0:03

Regarding Linking error Please Help me. It's a bit urgent

12-Apr-07 0:03

You're welcome.;)

WhiteSky

Nikhil Trivedi11-Apr-07 20:16

Nikhil Trivedi

11-Apr-07 20:16

Hello all,

When I tried to compile my program, I am having following error. If you know how to resolve please help me.

Linking...
mfcs42d.lib(stdafx.obj) : error : Internal error during Pass2
ExceptionCode = C0000005
ExceptionFlags = 00000000
ExceptionAddress = 1030C9DE
NumberParameters = 00000002
ExceptionInformation[ 0] = 00000000
ExceptionInformation[ 1] = 00000014
CONTEXT:
Eax = 00000000 Esp = 0012F0B0
Ebx = 00377DD0 Ebp = 0012F0C0
Ecx = 00000000 Esi = 00377DD0
Edx = 00001003 Edi = 00001003
Eip = 1030C9DE EFlags = 00010256
SegCs = 0000001B SegDs = 00000023
SegSs = 00000023 SegEs = 00000023
SegFs = 0000003B SegGs = 00000000
Dr0 = 0012F0B0 Dr3 = 00377DD0
Dr1 = 0012F0C0 Dr6 = 00000000
Dr2 = 00000000 Dr7 = 00000000
Error executing link.exe.
Tool execution canceled by user.

Thanks for ur prompt reply.

Regards,

Nikhs

Nikhil Trivedi

Re: Regarding Linking error Please Help me. It's a bit urgent

sthotakura11-Apr-07 21:30

sthotakura

11-Apr-07 21:30

If you are using VS.NET 2002, there is a fix available in Microsoft website @ http://support.microsoft.com/kb/826326[^]

if you are using a later version, then try complete clean build

Re: Regarding Linking error Please Help me. It's a bit urgent

Nikhil Trivedi11-Apr-07 21:37

Nikhil Trivedi

11-Apr-07 21:37

I am using Visual Studio 6.0. Can I use the link you provided for VS.net 2002 ? Let me know at the earliest please.

Thanks for the reply.

Regards,

Nikhs

Nikhil Trivedi

Re: Regarding Linking error Please Help me. It's a bit urgent

sthotakura11-Apr-07 21:50

sthotakura

11-Apr-07 21:50

I dont think you can use that, but you can give a try.

You can try other things like - make sure you dont have any whitespaces in yout temp/tmp directory names.
- make sure that you dont have any whitespaces in your object(.obj) file names
- make sure you are using link.exe that you think you are using

Cheers

Saving text files

cyn811-Apr-07 19:07

cyn8

11-Apr-07 19:07

Hi,
I've have a file which is written during a program and it is written by using myfile.write(string,string.GetLength()+1);
myfile is a temporary file where user may attempt to save it by clicking 'Save' button. However, i got one example on 'OnSave() function which i don't quite understand to use it.

void MyDlg::OnSave()
{
UpdateData();

GetBufferSize();
OPENFILENAME openfile;
openfile.lStructSize=sizeof(OPENFILENAME) ;
openfile.hwndOwner=AfxGetApp()->m_pMainWnd->m_hWnd;
openfile.lpstrFilter="Text Files (.txt)\0*.txt\0";
openfile.lpstrInitialDir=m_binfile;
openfile.lpstrTitle="Save Buffer";
openfile.lpstrCustomFilter=NULL;

// Set default file type in open file dialog
CString ext=m_binfile.Right(3);
ext.MakeUpper();
openfile.nFilterIndex=1;

CString filename="Result File";
filename=filename.Mid(filename.ReverseFind('\\')+1);
filename=filename.Left(filename.ReverseFind('.'));
char file[MAX_PATH];
file[0]=0;
strcpy(file,filename);
openfile.lpstrFile=file;
openfile.nMaxFile=MAX_PATH;
openfile.lpstrFileTitle=NULL;
openfile.Flags=OFN_HIDEREADONLY;
openfile.nFileOffset=0;
openfile.nFileExtension=0;
openfile.lpstrDefExt=ext;
openfile.lCustData=0;

if (!GetSaveFileName(&openfile))
return;

filename=file;

// Update file type selection
ext=filename.Right(3);
ext.MakeUpper();

// Saving buffer as binary file
HANDLE hFile=CreateFile(filename,GENERIC_WRITE,
FILE_SHARE_WRITE,
NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);

if (hFile==INVALID_HANDLE_VALUE)
{
m_status.Format(_T("Failed to save buffer!"));
UpdateData(FALSE);
MessageBox(_T("Failed to save buffer!"));
return;
}

// Save file
DWORD bytewrite;
SetFilePointer(hFile,0,0,FILE_BEGIN);
WriteFile(hFile,m_buffer,m_filesize,&bytewrite,NULL);
SetEndOfFile(hFile);

CloseHandle(hFile);

m_status.Format(_T("Buffer saved successfully."));
UpdateData(FALSE);
}

However is there any example that i can refer that allows myfile.txt to be saved in the chosen location after clicking 'Save'?

Thanks for any replies

Arman S.11-Apr-07 19:37

Arman S.

11-Apr-07 19:37

It's simple;

<br />
CString str = "... this is the file content to be saved ...";<br />
<br />
CFile f;<br />
if (f.Open("C:\\myFile.txt", CFile::modeCreate | CFile::modeWrite))<br />
{<br />
    f.Write(str, str .GetLength());<br />
}<br />

--
======
Arman

vimarsh puneet11-Apr-07 19:46

vimarsh puneet

11-Apr-07 19:46

void CfilelistDlg::OnBnClickedCancel()<br />
{<br />
	CString col1,col2;<br />
	CString str,load;<br />
        load="cool.xls";<br />
        CFile myFile1(load, CFile::modeReadWrite);<br />
        CArchive arStore(&myFile1, CArchive::store);<br />
        myFile1.SeekToBegin();<br />
        count=m_ctrlfile.GetItemCount();<br />
	while(count!=0)<br />
	{<br />
		col1=m_ctrlfile.GetItemText(count-1,0);<br />
		col2=m_ctrlfile.GetItemText(count-1,1);<br />
		arStore.WriteString(col1);<br />
		load="\t";<br />
		arStore.WriteString(load);<br />
<br />
		arStore.WriteString(col2);<br />
		load="\n";<br />
		arStore.WriteString(load);<br />
		count--;<br />
	}<br />
	arStore.Close();<br />
	OnCancel();<br />
}

see this article

here an excel file is used you can change it to txt.
as the data is loaded on the list control you can load it on a edit box or on any thing else. And when the user clicks the save button you can load the data again on the file, replacing the previous data

Hamid_RT11-Apr-07 21:15

11-Apr-07 21:15

You can use of

void CfilelistDlg::OnBnClickedCancel()
{
...
...

instead

<br />
void CfilelistDlg::OnBnClickedCancel()<br />
{<br />
...<br />
...<br />

Chris Maunder said :
"If you are posting source code with your question, place it inside pre /pre tags"

WhiteSky

vimarsh puneet11-Apr-07 22:36

vimarsh puneet

11-Apr-07 22:36

thanx will do it next time

Hamid_RT12-Apr-07 0:02