Thread is needed - C / C++ / MFC Discussion Boards

why does CreateInstance("ADODB.Connection") bring out exception?

liuyue22-Jun-05 23:31

22-Jun-05 23:31

before long, the program can run without error,but today it don't run.
m_pConnection.CreateInstance("ADODB.Connection") return 0, and there is the exception----First-chance exception in GIS.exe (KERNEL32.DLL): 0xE06D7363: Microsoft C++ Exception.
i write it in mfc.
how can figure it out ?

Re: why does CreateInstance("ADODB.Connection") bring out exception?

David Crow23-Jun-05 4:05

David Crow

23-Jun-05 4:05

Is m_pConnection a pointer? Is it a valid object?

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

broland c++ source code to visual c++

formula_200222-Jun-05 23:16

formula_2002

22-Jun-05 23:16

I have a source code written in borland c++.
How do I get it to run with visual c++

Thanks
Joe M

Re: broland c++ source code to visual c++

Cedric Moonen22-Jun-05 23:24

Cedric Moonen

22-Jun-05 23:24

It depends of what you want to do... If these are simple classes that only use the standard C++ libraries, then you can just import them in your project.

Re: broland c++ source code to visual c++

formula_200222-Jun-05 23:53

formula_2002

22-Jun-05 23:53

when I run the code in visual c++, it's looking for
include file fstream.h.

How can I get that file/

Thanks

Re: broland c++ source code to visual c++

toxcct23-Jun-05 0:40

toxcct

23-Jun-05 0:40

fstream.h is a header from the standard library...

is your program a console application, or windows ?

if it is a windowed apps, you'll have to learn from OWL to MFC or Win32...

one question, why do need to do such a thing ?

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Toggle Buttons

Extreme_Coder22-Jun-05 23:02

Extreme_Coder

22-Jun-05 23:02

Hi all,
I am making a small tool, which scans a specific file on the whole hard drive. I am making this application via a small Dialog based application. My dialog window will have three buttons "Scan", "Exit" and "About". I have a doubt

1) When user clicks the "Scan" button, the "Exit" button should change to "Stop" so the user can click this "Stop" button to stop the scan, while my tool is scanning the hard drive. Basically this "Exit" should act like TOGGLE style.

How to do this ?

K.K.Senthil Velan
Information Assurance Engineer

Thread is needed

Ghasrfakhri22-Jun-05 23:16

Ghasrfakhri

22-Jun-05 23:16

Hello
You need to use threads to handle messages while your project scan hard disk

Iman Ghasrfakhri

Re: Toggle Buttons

khan++23-Jun-05 0:06

khan++

23-Jun-05 0:06

Do it like this:
In header:
private:
BOOL m_bWorking;
public:
void DoScan();
static DWORD __stdcall ThreadScanner(LPVOID lpVoid);
-----
In OnInitDialog()...
m_bWorking = FALSE;
-----
In OnStartScan()...
DWORD id;
CreateThread(NULL,0,ThreadScanner,this,0,&id);
CButton* pButton = (CButton*)GetDlgItem(IDC_BTN_EXIT);//IDC_BTN_EXIT is the id for your Exit Button.
pButton->SetWindowText("Stop Scan");
m_bWorking = TRUE;
-----
DWORD __stdcall CScanDlg::ThreadScanner(LPVOID lpVoid)//where CScanDlg is you dialog class.
{
CScanDlg* pParent = (CScanDlg*)lpVoid;
pParent->DoScan();
return 0;
}
-----
In OnScan()...
while (m_bWorking)
{
Do the scanning here...
}
-----
in OnExit()...
if (m_bWorking == FALSE)
CDialog::OnCancel();
else
{
m_bWorking = FALSE;
CButton* pButton = (CButton*)GetDlgItem(IDC_BTN_EXIT);
pButton->SetWindowText("Exit");
}
Any problems understanding the code?
Please say if it does not work.
Happy Coding.

this is this.

Re: Toggle Buttons

David Crow23-Jun-05 4:07

David Crow

23-Jun-05 4:07

khan++ wrote:
CreateThread(NULL,0,ThreadScanner,this,0,&id);

Since this is an MFC application, AfxBeginThread() must be used.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

How can i change color of a specific word in a sentence

emmatty22-Jun-05 22:19

emmatty

22-Jun-05 22:19

Hello,
I am writing an application in which user can type sentences.I need to change colors some keywords in that sentence into blue. How can i accomplish this task in VC++.

Thanks in advance Big Grin | :-D

,
John.

Re: How can i change color of a specific word in a sentence

Cedric Moonen22-Jun-05 22:25

Cedric Moonen

22-Jun-05 22:25

You don't give us a lot of useful informations ! What kind of application are you doing ? Console, Win32 ? With or without MFC ? And where is this text written ? In a control or what ?

Re: How can i change color of a specific word in a sentence

emmatty22-Jun-05 22:30

emmatty

22-Jun-05 22:30

Thanks for the fastest reply.

I am developing a SDI application using MFC and the text will be written in the SDI's views . I am currently not using any kind of special controls.

Once again,Thanks.

John.

Re: How can i change color of a specific word in a sentence

ThatsAlok22-Jun-05 22:51

ThatsAlok

22-Jun-05 22:51

emmatty wrote:
I am developing a SDI application using MFC and the text will be written in the SDI's views

Easiest way to Get above would be use CRichEditView instead of CView!.

And Cedric -I am back in race Smile | :)

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Re: How can i change color of a specific word in a sentence

Cedric Moonen22-Jun-05 22:53

Cedric Moonen

22-Jun-05 22:53

Is CDC::SetTextColor of any help ?

Re: How can i change color of a specific word in a sentence

ThatsAlok22-Jun-05 23:27

ThatsAlok

22-Jun-05 23:27

Long time no see Bro Smile | :)

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Re: How can i change color of a specific word in a sentence

Cedric Moonen22-Jun-05 23:29

Cedric Moonen

22-Jun-05 23:29

Yep

. You were in hollidays ? Wink | ;)

Re: How can i change color of a specific word in a sentence

ThatsAlok22-Jun-05 23:36

ThatsAlok

22-Jun-05 23:36

cedric moonen wrote:
You were in hollidays ?

Yeap, celebrating holiday in hospital since last thursday due to intestine infection Smile | :)

. Now All ok!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Re: How can i change color of a specific word in a sentence

Cedric Moonen22-Jun-05 23:41

Cedric Moonen

22-Jun-05 23:41

Ouch.... Not so funny holidays Dead | X|

OPen GL in Dialog

itsvirtual22-Jun-05 22:14

itsvirtual

22-Jun-05 22:14

Hi
Please i want some information related to OpenGL and win32 Dialog
Actually i want to show open Gl window in the right corner of my dialog.
i want to create so that animation remains runninig in its own openGL window and i can give other controls on the left side
If anybody knows please help me.
Give me some link of tutorial or some link of sample code or if you have any such application you can send me or if you have any idea please let me know
i Will be very thankful to you;

Always be Happy When things done

Re: OPen GL in Dialog

Cedric Moonen22-Jun-05 22:20

Cedric Moonen

22-Jun-05 22:20

Does any article here[^] help ?

Re: OPen GL in Dialog

swati2423-Jun-05 2:43

swati24

23-Jun-05 2:43

There are a two main steps involved in this:

(1) You derive a CWnd class and overwrite its OnPaint(..) function to draw a GL window. You'll also need to setup pixel format, create a context using wglCreateContext(..). All this fairly generic and there are several examples on the net that combine MFC and GL. You must create this window using CWnd::Create(...) function in the CDlg::OnCreate().

(2) Now, the trick is that you position this window on the dialog where you want to draw. In order to do this you must call the OnSize(..) function of the dialog and then do MoveWindow on the derived CWnd class. In order to correct positioning for the top left corner, you can place a static resource on the dialog roughly where you wish to draw, and then use GetWindowRect(..) to find the coordinates. Bottom right coordinates are easy to find if you know the width and height of the window. Perhaps you can use the OnSize() params.

This is pretty much it. Please let me know if you face any problem.

Swati

TRACE clone

Weiye Chen22-Jun-05 22:11

Weiye Chen

22-Jun-05 22:11

I need to create a macro like TRACE to handle variable arguments but i can't seem to find it in vs folders. Any ideas?

<font=arial>Weiye Chen
Life is hard, yet we are made of flesh...

Re: TRACE clone

Mike Dimmick22-Jun-05 23:23

Mike Dimmick

22-Jun-05 23:23

IIRC TRACE simply expands to AfxTrace in Debug builds using MFC. AfxTrace is a function which takes a variable number of parameters.

Visual C++ does not support vararg macros, which are a new feature in C99 but not yet in the C++ standard.

Stability. What an interesting concept. -- Chris Maunder

Re: TRACE clone

C^hris L^osinger23-Jun-05 4:19

C^hris L^osinger

23-Jun-05 4:19

this is basically what TRACE does:

void MyTrace(const char* fmt, ...)
{
  char buffer[1024];
  va_list argptr;
  va_start(argptr, fmt);
  _vsnprintf(buffer, 1024, fmt, argptr);
  va_end(argptr); 
  OutputDebugString(buffer);
}

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