C / C++ / MFC Discussion Boards

badal_akr4-Jul-05 20:26

4-Jul-05 20:26

Hi,
I guess you might be using the COM library.
Because some time back i too had the same problem when i was using COM library.
So what you need to do just go through the proper usage of the COM library and uninitialize it at some other place.
Hopefully it should work
Anil

Anil Kumar

Re: Memory could not be written

David Spain6-Jul-05 3:14

David Spain

6-Jul-05 3:14

It could also be that you are using a pointer to a heap object, 'delete' was called on the pointer, and then this pointer variable was used again a few lines later in the code. The compiler would not catch this I don't believe, but may have given a warning in the compilation if the warning level was set high enough.

Another thing that could be the cause is uninitialized memory. Release mode does not initialize the variables I believe. So you may be using a pointer somewhere that refers to a bogus address.

You may already know this, but one thing you could do is to build it in release mode and run it on your machine, trying exactly what the user did, and see if it breaks for you also. If it does, then you know approximately where in the code it crashed and can look into the code to fix it. You have to run it in release mode, for the reason in the previous paragraph. In fact, for this same reason, one should always test in release mode before shipping.

David Spain, C++ Applications Programmer

Re: Memory could not be written

David Spain6-Jul-05 3:44

David Spain

6-Jul-05 3:44

Also, about the addresses, they will most likely not be the same as what is on your machine, because it is the memory address used by that machine. These addresses could even differ between different 'runs' of the program. It would depend on where the user's operating system put the program in memory for that particular execution. So using the memory addresses to find the error will not work in this case.

One more possibility, which you probably already know about, is that you could have written past the end of an allocated buffer.

David Spain, C++ Applications Programmer

Deleting classes in C++ v7 (.NET)

mcgmil4-Jul-05 5:44

mcgmil

4-Jul-05 5:44

I am trying to delete an unwanted class. I am using C++.NET and I am having difficulties (to say the least).

I have “physically” deleted the files from the folder where they are stored and I have also “physically” deleted the .obj file. I have then cleaned the sln.

When I try to build the sln I get a LINKER error for unresolved external.

Can anybody please tell me what else I should do to get rid of this class that is haunting me?

Thanks in advance Smile | :)

Re: Deleting classes in C++ v7 (.NET)

RChin4-Jul-05 5:49

RChin

4-Jul-05 5:49

Remove the files (.cpp and .h) from the solutions browser tree. You should be ok after this.

I Dream of Absolute Zero

Re: Deleting classes in C++ v7 (.NET)

mcgmil4-Jul-05 20:55

mcgmil

4-Jul-05 20:55

Thanks, the Phantom has gone. Big Grin | :-D

how to format usbdisk under win2k?

yqzq4-Jul-05 5:32

yqzq

4-Jul-05 5:32

i found FormatEx on www.sysinternals.com
but it not working
could you give me advices or some code?

thanks

I love programming

How To Debug dll

4-Jul-05 4:23

How to debug the dll, one exe contains more that dll, now i am trying debug viewer by using outputDebugString function, but my application is fully Dialog based. While running debugviewer gives a message m_pMainWnd is set to NUll, and after that it goes to terminate. where i can change the m_pMainWnd variable, please tell me how to solve this problem. and how to debug the dlls.

Srinivasarao M

Re: How To Debug dll

Iain Clarke, Warrior Programmer4-Jul-05 5:03

Iain Clarke, Warrior Programmer

4-Jul-05 5:03

A DLL is nothing without an EXE to hang it off. In VC++6, select the DLL project. Press f5 to "run" the DLL.
VC++ asks for an exe to use, so select an EXE that would use your dll. If you are making a shell extension,
pick explorer. If you already have a build exe, use that.

Then let things run, and VC++ will attach itself to the process for debugging as normal.

Iain.

Re: How To Debug dll

2249174-Jul-05 17:39

224917

4-Jul-05 17:39

An additional tip to open the debugger in extreme situations is to place
AfxDebugBreak( )or
_asm int3; in your dll code.

suhredayan
There is no spoon.

connect to mysql 4.1.17 from VS.NET c++

__horus__4-Jul-05 4:06

__horus__

4-Jul-05 4:06

from what i get this is a question where more programmers need help, so again:
i'm a novice programmer on Visual studio.net c++ and i need to connect it to mysql 4.1.17, it can be done with myodbc, bytefx or oledb, or another one that results, to make the normal operations (insert, select, delete, update ).
please help fast, it's really importante, and a sample application would be great, send it to horus.cv@gmail.com, but the code and the explanation is also good. Frown | :(

thanks

sigh:

Re: connect to mysql 4.1.17 from VS.NET c++

2249174-Jul-05 6:00

224917

4-Jul-05 6:00

Why don't you start doing the expected sample application your self. And post the problems over here as you come accross.
Btw pls check this [^] list of articles

suhredayan
There is no spoon.

Re: connect to mysql 4.1.17 from VS.NET c++

__horus__4-Jul-05 6:36

__horus__

4-Jul-05 6:36

string MyConString = "DRIVER={MySQL ODBC 3.51 Driver};" + "SERVER=localhost;" + "DATABASE=projecto;" + "UID=root;" + "PASSWORD=123;" + "OPTION=3";
MessageBox::Show(MyConString);
System::Data::Odbc::OdbcConnection MyConnection = new OdbcConnection(MyConString);

MyConnection.Open();

DataSet dataset=new DataSet();

System::Data::Odbc::OdbcCommand MyCommand = new OdbcCommand("select * from contactos",MyConnection);
MyCommand.ExecuteNonQuery();

this is the code i have so far, and it's not working.
i get errors like mycommand cannot be destroied and c:\Documents and Settings\horus\Desktop\estagio\progs em c++\mysqlclient\Form1.h(92): error C3861: 'MyCommand': identifier not found, even with argument-dependent lookup
, and many others.

please help

Re: connect to mysql 4.1.17 from VS.NET c++

2249174-Jul-05 6:48

224917

4-Jul-05 6:48

I feel Discussions on Managed Extensions for Visual C++ .NET [^] is a more suitable forum for your problem.

suhredayan
There is no spoon.

displaying dialog box in sdi or mdi window?

sayup4-Jul-05 3:46

sayup

4-Jul-05 3:46

hello,
I am working on graph plotting and i need to know if it is possible to display a dialog box in the client area of an SDI or MDI window?And is it possible to display it a particular location in the client window;say at the bottom;along the frame.If it is possible what are the steps?
please reply urgently

sayali

Re: displaying dialog box in sdi or mdi window?

M.Mehrdad.M4-Jul-05 4:37

M.Mehrdad.M

4-Jul-05 4:37

Yes, It is very Simple
You Must Create Dialog Dynamically
i.e.
CMyDialog dlg = new CMyDialog();
.....
delete dlg;
You Can Pass Position Param to Dialog with Constructor
or By Another Func, Like CMyDialog::SetParams(....);

Re: displaying dialog box in sdi or mdi window?

Jose Lamas Rios4-Jul-05 6:14

Jose Lamas Rios

4-Jul-05 6:14

If you are working with MFC, take a look to CFormView, or better yet, CDialogBar

--
jlr
http://jlamas.blogspot.com/[^]

HELP: Visual studio .NET compilation error

Member 20930494-Jul-05 3:43

Member 2093049

4-Jul-05 3:43

Guys, I don't know if that's the right place to post but am in deep trouble. I've been trying to use windows sockets for sometime on visual studio .NET, but for some wierd reason my code won't compile. The compiler is always giving a C2065 error(undeclared identifier), I believe the reason may be that visual studio has a wierd macro definition which is getting some header files not declaring the SOCKET identifier. Any Help would be greatly appreciated, so would any other guidline or direction to some other forum... Thanks guys

Bashar

Re: HELP: Visual studio .NET compilation error

PJ Arends4-Jul-05 9:27

PJ Arends

4-Jul-05 9:27

Not enough info Frown | :(

What line causes the error? What is on that line (and the line before it)? Have you looked up C2065 in MSDN?

You will get better answers if you actually provide some information for us to use.

Within you lies the power for good - Use it.

question about macro define

HeartFriend4-Jul-05 2:41

HeartFriend

4-Jul-05 2:41

void func(UINT nOperation)
{
#if (nOperation == OPERATION_1)
#define OPERATION(spObj, nParam) fun1(spObj, nParam)
#elif (nOperation== OPERATION_2)
#define OPERATION(spObj, nParam) func2(spObj, nParam)
#elif (nOperation== OPERATION_3)
#define OPERATION(spObj, nParam) func3(spObj, nParam)
nFrameNo)
#else
#define OPERATION(spObj, nParam)
#endif

....
OPERATION(spObj, n) // whatever nOperation be, it always call fun1,why???

}

Re: question about macro define [edited]

Jose Lamas Rios4-Jul-05 3:11

Jose Lamas Rios

4-Jul-05 3:11

Macros don't work at runtime; they are processed before compilation. Try something like this instead:

void func (UINT nOperation)
{
   switch (nOperation)
   {
      // [edited - Thanks DavidCrow] case default:
      default:
         break;
 
      case OPERATION_1:
         fun1(spObj, nParam);
         break;
 
      case OPERATION_2:
         fun2(spObj, nParam);
         break;
 
      case OPERATION_3:
         fun3(spObj, nParam);
         break;
   }
}

--
jlr
http://jlamas.blogspot.com/[^]

Re: question about macro define

David Crow4-Jul-05 11:22

David Crow

4-Jul-05 11:22

Jose Lamas Rios wrote:
case default:

No case needed here.

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

Re: question about macro define

Jose Lamas Rios4-Jul-05 13:14

Jose Lamas Rios

4-Jul-05 13:14

DavidCrow wrote:
Jose Lamas Rios wrote:
case default:

No case needed here.

Yep, you are right.

--
jlr
http://jlamas.blogspot.com/[^]

Re: question about macro define

S. Senthil Kumar4-Jul-05 5:01

S. Senthil Kumar

4-Jul-05 5:01

You've mixed up precompiler directives with code. Macro expansion (and execution of other precompiler directives) happen before code is compiled.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

How to detect the dll or exe from the address(memory) of its function?

saravananvv4-Jul-05 2:32

saravananvv

4-Jul-05 2:32

Hi,
I need to know how i can detect a keylogger.
I've found some basic technique in doing the same.
The technique is
1.Get the image of the user32.dll
2.Disassemble the dll( traverse the user32.dll ie find the memory location of all the api in the user32.dll)
3.If the api is hooked means it will be having a jump instruction when the original api is called.
4.If this jump instruction points to a memory location outside the image of the user32.dll then the api is hooked otherwise it is not.
5.I've found the memory address of the hooked function.

My question how can i detect the dll or exe from the function pointer address which i got from the discrepancies i found when the api is hooked.

Pls provide a solution to that.

Regards
saravanan

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