C / C++ / MFC

15-Apr-04 5:13

Hi,

Currently i am working on single document interface MFC to create a small update program to the database to change the values store in the fields.

However, in order to let the program run "automatically", i have to used thread. But I know nuts about threading.

I have attached the main part of the updating of the program below. pls kindly help..I have read up on books about C++ on the thread function. the book says, to create and start, i have to use AfxBeginThread and have some arguements inside. and a function UINT MyThreadFunction(LPVOID pParam).

Really need help on this as its very urgent to me... Thanks a million.

<br />
void CUpdateView::OnUpdatedb() <br />
{<br />
	// TODO: Add your control notification handler code here<br />
<br />
	double propa_update = 0.814;<br />
	double resp_update = 0.205;<br />
	double link_update = 1.19;<br />
<br />
	//get a pointer to the recordset<br />
	CUpdateDoc* pDoc = GetDocument();<br />
	UseRecordset* pUseRecordset	= &pDoc->m_UseRecordset;<br />
<br />
	do<br />
	{<br />
		//Allows the current record to be edited<br />
		pUseRecordset->Edit();<br />
			<br />
		//increment in the values from the database<br />
		pUseRecordset->m_propatime = pUseRecordset->m_propatime*propa_update;<br />
		pUseRecordset->m_respondtime = pUseRecordset->m_respondtime*resp_update;<br />
		pUseRecordset->m_link = pUseRecordset->m_link*link_update;<br />
		<br />
		//Saves the current changes to the database<br />
		pUseRecordset->Update();<br />
<br />
		//Reruns the current SQL query to refresh the recordset<br />
		pUseRecordset->Requery();<br />
<br />
		//Update the form<br />
		UpdateData(true);<br />
	}while(check_exit!=0);<br />
}<br />
<br />
void CUpdateView::OnExit() <br />
{<br />
	check_exit=0;<br />
	OnExit();<br />
}

David Crow15-Apr-04 7:16

15-Apr-04 7:16

Sounds like you need a worker thread (i.e., a thread with no message pump). If so, read this article. When it comes time to update the database, create the thread and put your update code in this thread. You might want to periodically post a message back to the main thread indicating progress.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

dreamerzz15-Apr-04 20:38

15-Apr-04 20:38

Hi,

I have read the article that you gave me and have tried implementing the methods into my program.. however, that are still one error which i hope u could help me..

<br />
void CUpdateView::OnUpdatedb() <br />
{<br />
        // TODO: Add your control notification handler code here<br />
        running = true;<br />
        AfxBeginThread(run, this);<br />
<br />
}<br />
<br />
UINT CUpdateView::run(LPVOID p)<br />
{<br />
	CUpdateView* pView = (CUpdateView*)p;<br />
	pView->run();<br />
<br />
	double propa_update = 0.814;<br />
	double resp_update = 0.205;<br />
	double link_update = 1.19;<br />
<br />
	do<br />
	{<br />
		//get a pointer to the recordset<br />
		CUpdateDoc* pDoc = GetDocument();		UseRecordset* pUseRecordset	= &pDoc->m_UseRecordset;<br />
<br />
		//Allows the current record to be edited<br />
		pUseRecordset->Edit();<br />
			<br />
		//increment in the values from the database<br />
		pUseRecordset->m_propatime = pUseRecordset->m_propatime*propa_update;<br />
		pUseRecordset->m_respondtime = pUseRecordset->m_respondtime*resp_update;<br />
		pUseRecordset->m_link = pUseRecordset->m_link*link_update;<br />
		<br />
		//Saves the current changes to the database<br />
		pUseRecordset->Update();<br />
<br />
		//Reruns the current SQL query to refresh the recordset<br />
		pUseRecordset->Requery();<br />
	}while(check_exit!=0);<br />
<br />
	return 0;<br />
}<br />
<br />
void CUpdateView::OnExit() <br />
{<br />
	running = false;<br />
}

The part that i have it bold is giving mi the error..

the error message is :

'CUpdateView::GetDocument' : illegal call of non-static member function
This problem is it because i have the UINT CUpdateView::run(LPVOID p) declare as static?

see declaration of 'GetDocument'
My declaration is CUpdateDoc* GetDocument(); in CUpdateView Class

David Crow19-Apr-04 2:28

19-Apr-04 2:28

See if this helps:

//get a pointer to the recordset
CUpdateDoc* pDoc = pView->GetDocument();

Keep in mind that what you have will not work if the primary thread is also accessing the document or the recordset.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

dreamerzz20-Apr-04 2:14

Visual Basic-like editor for VC++ 6.0?

20-Apr-04 2:14

Hi,

Thanks for ur help.

dReaMerzZ

AAntix15-Apr-04 4:55

AAntix

15-Apr-04 4:55

I can remember a tool a couple years back that provided a dialog editor similar to VB, where control colors, etc could be easily changed, but it was for VC++. Does anyone remember the exact product?

Jim
QTExtender - The OFFICIAL addon for QuoteTracker.

toxcct15-Apr-04 6:54

toxcct

15-Apr-04 6:54

wasn't it the "Borland C++" one ?

TOXCCT >>> GEII power

David Crow15-Apr-04 7:13

15-Apr-04 7:13

Yes, Borland had a very nice one called Resource Editor. Whether it's the one in question remains to be seen.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

AAntix15-Apr-04 7:21

AAntix

15-Apr-04 7:21

No, I don't believe it was Borland.

The interface was identical to VB's, with the obvious exception it generated the appropriate gui code on the backend.

Jim
QTExtender - The OFFICIAL addon for QuoteTracker.

Plug-in to read HTML page for IE?

Prakash Nadar15-Apr-04 17:55

Prakash Nadar

15-Apr-04 17:55

I think VS.NET has that feature.

Pauwll15-Apr-04 4:41

Pauwll

15-Apr-04 4:41

Hi,

I'd like to create a toolbar in IE, so that when a user clicks it, it can 'read' the current HTML page being displayed. Does anyone have a pointer where to look for some example code?

Sort of like clicking the "view source" menu option, but then with code of my own.

thanks.

Pauwl

void main

dreamerzz15-Apr-04 4:38

15-Apr-04 4:38

Hi,
For a normal Visual C++ program, we have a void main. But in creating a MFC single document interface, does anyone know which function is something similar to void main?

Thanks for ur help

jmkhael15-Apr-04 4:55

jmkhael

15-Apr-04 4:55

The main in MFC is a "WinMainX" and is somehow "invisible" to the eye, it was wrapped by MFC code,

What do you exactly need?

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

dreamerzz15-Apr-04 5:17

15-Apr-04 5:17

Hi,

I would like the program to start running once i compile the program.. so i was thinking if i could add my coding in the void main then i can get it start running the minute i compile it..

dreamerzz

jmkhael15-Apr-04 5:25

jmkhael

15-Apr-04 5:25

you mean while compiling it????
or you want a program to run while compiling another?
o you want to run the program as soon as it finish compiling and linking?

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

dreamerzz15-Apr-04 5:30

15-Apr-04 5:30

oh.. sorry for the unclear msg.. I want to run the program as soon as it finish compiling and linking.. whereby the program seems to be "automatically" running..

dreamerzz

David Crow15-Apr-04 7:11

15-Apr-04 7:11

Start it within the IDE using Ctrl+F5. That'll compile and link (if necessary), and then run.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

basementman15-Apr-04 5:29

basementman

15-Apr-04 5:29

See AppModul.cpp for specific implementation details of _tWinMain.

onwards and upwards...

Joan M15-Apr-04 5:47

Joan M

15-Apr-04 5:47

Argh... the internet connection failed just when I posted the first answer... Mad | :mad:

well...

lets do it again...

You can do it in three ways:

-> if you don't need to do anything to the GUI you can use the InitInstance function in the main class.

-> if you need to interact with the main frame (the SDI document view container) you can do it in the precreatewindow function in the mainframe class.

-> if you need to interact with the view you can do it in the precreatewindow of the view class.

hope this helps...

dreamerzz15-Apr-04 5:52