C / C++ / MFC Discussion Boards

Re: MFC CreateEx function crashes program

ChrisBuckley5-Oct-09 4:59

5-Oct-09 4:59

Tim Craig wrote:
Often when the debug version works and the release crashes and you're dealing with pointers, you might have an uninitialized pointer. The debug heap zeros data blocks before it returns them and the release version doesn't. The pointer value itself is nonNULL but contains garbage so when something dereferences it, the program crashes. If the function accepts NULL as a valid pointer, it obviously checks and doesn't try to dereference the pointer. Since it worked before, you may just have gotten lucky and the garbage in the pointer pointed to something that could be interpreted as a valid string.

Thanks, that's useful to know. I was imagining that it could be a memory problem somewhere. The code I inherited when I took this project over was awful; even the debug version was letting me know about numerous memory leaks. I wrapped most of the code in classes and cleaned up new/delete calls all over but it is possible there is a more subtle problem going on that the debugger isn't letting me know about.

Debug Error - Calling a class member function declared in another file

AntoineBab2-Oct-09 3:14

AntoineBab

2-Oct-09 3:14

I'm a french new MFC programmer, and at run-time (compiling is OK), I got a message from MSVC++. This message is a Debug Error(Value of ESP was not properly saved...Problem of convention function calling). It's seems I located the call function which generate this exception. Following a piece of my source code. I think it's a function declaration problem. Thank's if someone could help me.

// repository.h
class CRepository
{
{
	struct Server {
		struct AutomationModules { 
			int  nDataValid;
			char szFilename[20];
			char szDrawrow1[50];
			char szDrawrow2[50];
			char szDateModifier[10];
		};
		char szServerName[20];						// Individual Server name
		// array files of XXX element of type AutomationModules
		AutomationModules files [MAX_FILES];
		int nValid;									// validity
	};
//Défintion des éléments accesiblent à l'exterieur de la classe
public:
	CString RepositoryName;							// Repository name
	bool bModify;									// Repository state

	//// array server of XXX element of type Server
	Server server[MAX_SERVERS];

	CRepository() {} 
	virtual ~CRepository() {}


.....
public:
void InverseServer(CRepository::Server *Svr1,CRepository::Server *Svr2);
...
};

// heap object
CRepository *pRepository = new CRepository;


// calling from another file 
// xxx.cpp
...
extern CRepository *pRepository
...
pCrepository->InverseServer(&server[j],&server[j+1]);
...

Re: Debug Error - Calling a class member function declared in another file

David Crow2-Oct-09 8:56

David Crow

2-Oct-09 8:56

AntoineBab wrote:
...I got a message from MSVC++. This message is a Debug Error(Value of ESP was not properly saved...Problem of convention function calling).

Which statement is generating the error?

AntoineBab wrote:
pCrepository->InverseServer(&server[j],&server[j+1]);

What is the value of pCrepository at this point?

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Background Colour of TabControl

Deepak.Prahlad2-Oct-09 3:00

Deepak.Prahlad

2-Oct-09 3:00

Hi
How can I change the color of a Tab Control? I manged to change the color of a static text and dialog. I need to change the color of the Button control and Tab control from the default gray to a color matching my dialog. How to do this? Please help

Thanks in advance
Deepak

Re: Background Colour of TabControl

Deepak.Prahlad6-Nov-09 21:08

Deepak.Prahlad

6-Nov-09 21:08

I got a solution for Tab Controls. Atleast what I intended to do.

It is here CXTabCtrl: an easier tab control for dialogs and forms[^]
and
Ownerdraw Tab Controls - Borders and All[^]

I managed to club the functionality from these two and achieved my objective.

Thanks to http://www.codeproject.com/Members/xicoloko[^]
and
http://www.codeproject.com/Members/dan-g[^]

Deepak

how to pass arguments to createproces() function

WindowsVsLinux2-Oct-09 1:26

WindowsVsLinux

2-Oct-09 1:26

hi,
i have a C++ program which can open cmd using createprocess() function but i want to give command to cmd.means when i run my program it will open cmd and if i want to show the directory i ahve to write in cmd dir but i want that i write dir in my program and it will automatically execute in cmd.can i do this?

Re: how to pass arguments to createproces() function

CPallini2-Oct-09 1:57

CPallini

2-Oct-09 1:57

Do you have troubles adding "cmd " to the actual command typed in your application?
You may also use the system CTR function, for instance

void main()
{
  system("dir");
}

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: how to pass arguments to createproces() function

WindowsVsLinux2-Oct-09 2:34

WindowsVsLinux

2-Oct-09 2:34

no no actually i use there scanf function and if i use system() commmand and type command cd c:\ then it will not goes to c: drive.I simply want to write a program which can give command to cmd and show me the output in my C++ running window.means whatever cmd shows it will be shown on my screen

Re: how to pass arguments to createproces() function

Michael Schubert2-Oct-09 2:39

Michael Schubert

2-Oct-09 2:39

Are you talking about console input/output redirection?

Re: how to pass arguments to createproces() function

WindowsVsLinux2-Oct-09 2:44

WindowsVsLinux

2-Oct-09 2:44

ya ya Michael

Re: how to pass arguments to createproces() function

David Crow2-Oct-09 2:50

David Crow

2-Oct-09 2:50

See here and here.

Re: how to pass arguments to createproces() function

Michael Schubert2-Oct-09 2:52

Michael Schubert

2-Oct-09 2:52

Here are some articles:

Real-Time Console Output Redirection[^]

Redirecting an arbitrary Console's Input/Output[^]

Universal Console Redirector[^]

CaptureConsole.DLL - A Universal Console Output Redirector for all Compilers[^]

Re: how to pass arguments to createproces() function

CPallini2-Oct-09 2:44

CPallini

2-Oct-09 2:44

There are several articles about here [^] at Code Project.
Smile | :)

Re: how to pass arguments to createproces() function

David Crow2-Oct-09 2:21

David Crow

2-Oct-09 2:21

ravi 12 wrote:
...when i run my program it will open cmd and if i want to show the directory i ahve to write in cmd dir...

Why don't you use the FindFirstFile() and FindNextFile() pair?

Re: how to pass arguments to createproces() function

Michael Schubert2-Oct-09 2:33

Michael Schubert

2-Oct-09 2:33

I don't know how you guys decipher this gibberish. It looks like Liquid Nitrogen to me...

Re: how to pass arguments to createproces() function

Cedric Moonen2-Oct-09 2:51

Cedric Moonen

2-Oct-09 2:51

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Cloning Dialogs in VS2005

Grahamfff2-Oct-09 0:13

Grahamfff

2-Oct-09 0:13

In a C++ MFC application I have a Main dialog and several child dialogs. Now one of these child dialogs I used the Tabbed Dialog (CTabDialog - which had a main dialog and a dialog for each TAB). This worked greatand it has loads of code associated with the many controls on these tabs.

Now I would like to clone this dialog x2.

What is the best way to try and do this?

I am worried about the IDD/IDC etc in the resource.h file.

I can do global exchange for many items in the code.

Has anyone done this before or suggest the scheme to do this.

Many thanks,

Graham

grahamfff

Re: Cloning Dialogs in VS2005

Cedric Moonen2-Oct-09 1:00

Cedric Moonen

2-Oct-09 1:00

Why do you need to clone it ? Can't you simply reuse it ? D'Oh! | :doh:

Do you need different functionalities ? If yes, can't you simply make two classes inheriting from the same base class ?

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Re: Cloning Dialogs in VS2005

Grahamfff2-Oct-09 1:33

Grahamfff

2-Oct-09 1:33

The program controlled a hardware item, using a database and shared library. Now would like to control three items of hardware; which can be done OK. But need three instances of the GUI to control each h/w item.

If was starting the scratch then could design a class for this scheme, but too late now.

For ease and speed, clone the GUI and global change the code behind it.

Graham.

grahamfff

automation with excel want to save file

prithaa1-Oct-09 23:54

prithaa

1-Oct-09 23:54

Hello,

I have a code to open an excel file , add a chart and want to save the chart with the file. Opening file adding chart is done but for saving the file is not saved directly it asks for changes

_Workbook newBook;

newBook.Save(); // this save doesnt work
// i have to write the SaveAs
newBook.SaveAs(COleVariant("d:\\wip4.csv"),vOpt,vOpt,
vOpt,vOpt,vOpt,0,vOpt,vOpt,vOpt,vOpt,vOpt);

How should I save the changes to file ?

Pritha

Re: automation with excel want to save file

David Crow2-Oct-09 2:23

David Crow

2-Oct-09 2:23

prithaa wrote:
newBook.Save(); // this save doesnt work

Which means what exactly?

Re: automation with excel want to save file

prithaa2-Oct-09 7:41

prithaa

2-Oct-09 7:41

Hello,

newBook.Save() gives Unhandled exception in .exe Microsoft C++ exception.

Pritha

Re: automation with excel want to save file

enhzflep2-Oct-09 4:43

enhzflep

2-Oct-09 4:43

Granted, this is vba code - though I'm sure you'll work it out if you've come his far...

---------- 8< ----------------

Sometimes the application displays a messagebox asking if the user wants to continue,
if he/she wants to save a file before closing, or want some other verification from the user.
These messages can be turned off by using this command in a macro :

Application.DisplayAlerts = False
The warningmessages will remain turned off until you enable them again with this command:

Application.DisplayAlerts = True
If you just want to close a workbook without the user being prompted for any confirmations about saving
the workbook you can simply do this:

ActiveWorkbook.Close False ' closes the active workbook without saving any changes

ActiveWorkbook.Close True ' closes the active workbook and saves any changes

--------------------- >8 ------------------------

How to use message queue in CCmdTarget Derived class?

dehseth1-Oct-09 23:33

dehseth

1-Oct-09 23:33

Hey guys,

How can I enable my class, which is derived from CCmdTarget, to use message maps and message queues.

How to know which particular user has fired log-off?

Kushagra Tiwari1-Oct-09 20:57

Kushagra Tiwari

1-Oct-09 20:57

I have to make an application which will run on Servers like win 2k3 and Win 2k8. This application will run in system account with multiple instances each for one user logged on the machine. This application is designed to trap logoff event and stop logoff ..do some job and then progress ahead with logff.I am trapping WM_QUERYENDSESSION for this purpose, but unfortunately I donot get any information about which user has loggedd off. I am stuck here as all my applications running trap this message but I need to match them with the user name who actually wants to logg of depending upon that I will have to log off that particular user using his session ID.Please help me out in this.

Regards,
Kushagra

I hate coding but I luv to develop Smile | :)

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