Re: Task Manager - C / C++ / MFC Discussion Boards

David Crow30-Jul-04 4:24

30-Jul-04 4:24

sirtimid wrote:
db.Open(_T(""), FALSE, FALSE, "ODBC;DSN=MY_DSN");

I believe this should be (with added exception handling):

TRY
{
    db.Open(NULL, FALSE, FALSE, "ODBC;DSN=MY_DSN");
}
CATCH(CDBException, pDBException)
{
    ...
}
END_CATCH

But that's probably just a semantics thing.

sirtimid wrote:
Now I want to open the table "MyTable" from the database, how should I do this?

Derive a class from CRecordset using ClassWizard. It will ask you which table(s) the record set should operate on. After than, just instantiate an object of this new class, something like:

TRY
{
    CMyRecordset rs(&db);
    rs.Open();
    if (! set.IsBOF())
    {
        rs.MoveFirst();
        while (! rs.IsEOF())
            rs.MoveNext();
    }
}
CATCH(CDBException, pDBException)
{
    ...
}
END_CATCH

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: CRecordset open table

Manfred Staiger30-Jul-04 4:58

Manfred Staiger

30-Jul-04 4:58

1) The Class Wizard has a problem with MSAccess 2000 files. I you will need to make the same database with Access 97 and derive your classes with that.

2)
For MSAccess, using CDaoDatabase and CDaoRecordset are the better choice.

3)
Do like DavidCrow has written before.

MS

Task Manager

Jnewg530-Jul-04 4:08

Jnewg5

30-Jul-04 4:08

I have both Studio 6 and Studio .NET installed on one machine. I want to be able to attach to either debuggers via Task Manager right click "Debug" context menu item. I have figured out how to modify the "Debug" command for either studio (e.g. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug\Debugger). However, what I want is to add 2 items to the context menu of Task Manager so that I can choose which debugger I want. I haven't been able to find the location of Task Manager's context menu data in the registry which makes me think that it may not be alterable. Unless someone knows and I have overlooked - which I am hoping is the case.

Thanks!

Re: Task Manager

jmkhael30-Jul-04 4:26

jmkhael

30-Jul-04 4:26

Why not a simple EXE that acts as a proxy.
Once an attach has been requested, u pop up this exe and from it you have the various choices, and based on the choice, you invoke the correct debugger with the correct command line.

Something like :
"MSDEV -p procid -e procid"

I have to tell you that Studio .NET will nag that he aint the JIT debugger, so a workaround to this problem would be to set it as the JIT debugger then to reactivate yourself as the JIT debugger afterwards.

Good luck.

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Task Manager

Jnewg530-Jul-04 4:37

Jnewg5

30-Jul-04 4:37

Thanks for the response and suggestion, but I have successfully launched VC6 Debugger by altering the registry previously mentioned and haven't had a problem with the JIT debugger. If it turns out that I can't add to the context menu, I will pursue your suggestion.

Thanks!

Re: Task Manager

jmkhael30-Jul-04 4:45

jmkhael

30-Jul-04 4:45

Maybe i didnt make it clear, but VC6 would attach happily by just using the command line, VS.NET would nag if he finds out he's not the prefered JIT Smile | :)

Another choice is like it is suggested in the other post, to attach from within the interface.
For me i find it much easier to have a small exe where i can chose directly my debugger for the current problem, would it be VC6 VS.NET, WinDbg, OllyDbg or ... let it crash!

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Task Manager

Michael P Butler30-Jul-04 4:36

Michael P Butler

30-Jul-04 4:36

You can't modify task-manager but both VS.NET and VS6 allow you to attach to a running process. The option is on the debug menu of VS.NET and on the Build->Start Debug menu of VC6.

Michael

CP Blog [^]

Re: Task Manager

Jnewg530-Jul-04 5:07

Jnewg5

30-Jul-04 5:07

Thanks - I am aware of that, but I am falling in line with the adage that "Programmers are lazy." Smile | :)

Re: Task Manager

Michael P Butler30-Jul-04 6:29

Michael P Butler

30-Jul-04 6:29

Jnewg5 wrote:

Thanks - I am aware of that, but I am falling in line with the adage that "Programmers are lazy."

As a lazy programmer myself, I find using the VS.NET menu easier and quicker, but then again it is very rare that I need to debug an app built by VS6. Only got one supported product using it now.

Michael

CP Blog [^]

Re: Task Manager

jmkhael30-Jul-04 6:33

jmkhael

30-Jul-04 6:33

As a lazy programmer myself, i made a small utility that runs in the background, when i press CTRL + F1 it automatically attaches the application i preconfigure it with into the debugger of my choice.
This utility also records some macros and send some keystrokes.
Smile | :)

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Task Manager

Michael P Butler30-Jul-04 6:36

Michael P Butler

30-Jul-04 6:36

Papa wrote:
i made a small utility that runs in the background, when i press CTRL + F1 it automatically attaches the application i preconfigure it with into the debugger of my choice.
This utility also records some macros and send some keystrokes.

Cool. Have you posted it as an article? Sounds like it might be a useful tool for your fellow CPians. I don't debug many running processes, so it probably wouldn't save me much time but it might help some others.

Michael

CP Blog [^]

Re: Task Manager

jmkhael30-Jul-04 6:40

jmkhael

30-Jul-04 6:40

Not yet.
I guess i will in the near future, but i know it can make my daily tasks easier, cos in order to test our system, we should enter a username password, so just imagine the number of times you enter those Dead | X|

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

CRecordset open table

sirtimid30-Jul-04 3:39

sirtimid

30-Jul-04 3:39

I want to open and edit a Microsoft Access 2000 (mdb) file by using the CDatabase and CRecordset classes in Microsoft Visual C++ 6.0.
I open the database using the following command:
db.Open(_T(""), FALSE, FALSE, "ODBC;DSN=MY_DSN");
Now I want to open the table "MyTable" from the database, how should I do this?
I tried the following code, but it threw me an exception at file "dbcore.cpp" at line 66.
CRecordset rs(&db);
rs.Open(CRecordset::dynaset,"MyTable",CRecordset::none);

Does anyone know why this error occured and how can I open that table correctly?

Thanks in advance

Yet another class hierarchy problem...

vmaltsev30-Jul-04 3:22

vmaltsev

30-Jul-04 3:22

Hello everyone,
I'm still struggling with my classes hierarchy. Now, what I have is pure abstract interfaces classes and correspondent to them objects classes, which are actually hidden inside dll.

API.h

<br />
// Unique ID class<br />
class __declspec(dllexport/dllimport) CxID {<br />
public:<br />
  // C-tor, D-tor, some other methods.<br />
  static const int GetID();<br />
private:<br />
  static int iID;<br />
};<br />
// Interfaces<br />
class IxA {<br />
  virtual int GetA() = 0;<br />
};<br />
class IxB_Only {<br />
  virtual int GetB() = 0;<br />
};<br />
class IxB: public IxA, public IxB_Only {<br />
};<br />
<br />
extern __declspec(dllexport/dllimport) IxB *GetObject(); // Just a test function<br />

DLL.h

<br />
#include "API.h"<br />
class CxA: public CxID, public IxA {<br />
public:<br />
  // C-tor, D-tor, some methods.<br />
  int GetA() { return 0xAA; }<br />
private:<br />
  ID m_ID;<br />
};<br />
class CxB: public CxA, public IxB_Only {<br />
  // C-tor, D-tor, some methods.<br />
  int GetB() { return 0xBB; }<br />
};<br />

DLL.cpp

<br />
CxB *g_pObj;<br />
BOOL APIENTRY DllMain(...) {<br />
   ...<br />
   case DLL_PROCESS_ATTACH:<br />
     g_pObj = new CxB();<br />
   break;<br />
   ...<br />
}<br />
<br />
// Just a global function to return pointer on global object created in DLL<br />
__declspec(dllexport/dllimport) IxB *GetObject() {<br />
  return (IxB*)g_pObj;<br />
};<br />

Now, in application:

<br />
IxB *pObj = GetObj();<br />

So, what I want to achive by doing that is to be able to cast B object, which is hidded in dll and not known to user, to public ifaces iB and iA.
But, I have a problem. (Sorry for such long introduction)
When I debug my app I see this:

pObj
  |--[CxB]
  |    |--CxA
  |    |   |--IxA __vfptr with good address and fuctions
  |    |--IxB_Only __vfptr with good address and functions
  |--IxA __vfptr with good address and functions
  |--IxB_Only __vfptr with... 0xcdcdcdcd and error CXX0030: expression cannot be evaluated

It's obvious when I do pObj->GetB() I get "Access violation".

I have no idea what is wrong. It must work, I know it. But I can't see the flaw.
Please, plase, plase, somebody, any clue?

Thanks in advance.

Re: Yet another class hierarchy problem...

darkbyte30-Jul-04 6:17

darkbyte

30-Jul-04 6:17

Is it possible that the problem lies within your constructors ?

Re: Yet another class hierarchy problem...

vmaltsev30-Jul-04 12:27

vmaltsev

30-Jul-04 12:27

Hail Darkbyte,

No, simply because I don't have anything in C-tors except zeroing a couple of integers.

Thanks for the answer though. Smile | :)

Serial Port Communication

ciitpk30-Jul-04 3:05

ciitpk

30-Jul-04 3:05

Salam From Hafiz Rose | [Rose]

Serial Port Communication is my
interresting topic,I want to
work at it if some one know
about it tell me to create
(establish) serial connection
Rose | [Rose]

thanks From Hafiz Rose | [Rose]

Re: Serial Port Communication

ThatsAlok30-Jul-04 3:26

ThatsAlok

30-Jul-04 3:26

Hain buddy,
just Search CSerialPort Class in Codeproject,that will really help you in you cause.

khuda hafiz

-----------------------------
"I Think It will Work"
Formerly Known As "Alok The Programmer" at CP
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk

Re: Serial Port Communication

valikac30-Jul-04 5:10

valikac

30-Jul-04 5:10

Check out MSDN.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnfiles/html/msdn_serial.asp

Kuphryn

capturing frame and manipulate image

milos++30-Jul-04 2:29

milos++

30-Jul-04 2:29

I am doing realtime video manipulation software... so far, I am capturing frame from a camera, saving it to a disk and then retriveing it, converting to array of integers, and then do the manipulation.
Here I get about 2fps which is not acceptable.
Is there way to grab a frame and point where the image is the RAM and change pixels there?

in VC++ or VB6

thanks

Re: capturing frame and manipulate image

normanS1-Aug-04 20:26

normanS

1-Aug-04 20:26

More information on what you are using would help people answer the question.

The solution depends on how you are grabbing the image.

I have used Imagenation and National Instruments frame grabber cards - both of these come with sample applications in VC++ / VB, which let you allocate frame buffers in main memory, capture images to these buffers, access and process the image, and display the frame.

Re: capturing frame and manipulate image

milos++2-Aug-04 3:58

milos++

2-Aug-04 3:58

thanks for the reply...

I want to be able to use WDM (i think it's called that way) so I can use any camera. Currently I am using it with video in on Elsa Erasor 3 graphic card and with some cheap webcams...

I'm not sure how that really works but in my head I am supposed to find out address of the frame buffer in memory and take each captured pixel, change RGB value and put it back...

No idea

normanS2-Aug-04 19:26

normanS

2-Aug-04 19:26

Sorry - my experience was using drivers which came with grabber cards, not WDM drivers. I wish I could help you!

Re: No idea

milos++2-Aug-04 23:43

milos++

2-Aug-04 23:43

thanks anyway...

Ive foung cFrameGrabber ehich is supposed to be a warper for AviCap which manipulates image directly in memory... the example application is so huge and complicated and maybe only 2fps faster then in Visual Basic with saving to file...
I guess I will wait a few years till computers gets stronger Smile | :)

Print Preview appears microscopic

JHAKAS30-Jul-04 2:28

JHAKAS

30-Jul-04 2:28

Well the printing is dangerous task i do not know why in MFC. I am in fix for this problem.

Problem Statement:
1.0 If i am using default mapping mode i.e. MM_TEXT or explicitly mentioning
mapping mode as MM_TEXT here then circle is drawn on view. But on the
Print Previewing the image turns out to be microscopic.
2.0 If i am using mapping mode MM_LOENGLISH, then on menu item clicking it
draws but on OnDraw it doesnot shows again. and every thing is
blank. Even in print preview.

I had attaching sample code and application on the codeguru forum which illustrates the problem.

http://www.codeguru.com/forum/showthread.php?t=304420

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