Re: Strange error - C / C++ / MFC Discussion Boards

Bob Stanneveld4-Aug-03 22:23

4-Aug-03 22:23

If you press other bottons on the dialog, do you get the same error?

jij bent trouwens de eerste nederlander die ik hier tegenkom Smile | :)

A student knows little about a lot.
A professor knows a lot about little.
I know everything about nothing.

Re: Strange error

BoudewijnEctor4-Aug-03 22:25

BoudewijnEctor

4-Aug-03 22:25

No, i don't get the same error : it's unique

Nee hoor, ik krijg niet dezelfde error, dit gebeurt alleen bij die specfieke knop.

Re: Strange error

Bob Stanneveld4-Aug-03 22:27

Bob Stanneveld

4-Aug-03 22:27

Post the code for the OnCancel() method, the problem probably lies there

A student knows little about a lot.
A professor knows a lot about little.
I know everything about nothing.

Re: Strange error

Bob Stanneveld4-Aug-03 22:32

Bob Stanneveld

4-Aug-03 22:32

I mean the OnBnClickedCancel() method,...

A student knows little about a lot.
A professor knows a lot about little.
I know everything about nothing.

Re: Strange error

BoudewijnEctor4-Aug-03 22:33

BoudewijnEctor

4-Aug-03 22:33

it's just EndDialog(IDCANCEL);

Re: Strange error

Bob Stanneveld4-Aug-03 22:45

Bob Stanneveld

4-Aug-03 22:45

When I look at the declaration of EndDialog, you are missing a parameter! (from the msdn library: BOOL EndDialog(HWND hDlg, INT_PTR nResult);)

but let's get something straight:
When you press the cancel button, OnBnClickedCancel() is called.
From there you call EndDialog().

Assuming this, maybe you should call CDialog::OnCancel(). The EndDialog function just ends the message loop returning control to the system, maybe something goes wrong there.

A student knows little about a lot.
A professor knows a lot about little.
I know everything about nothing.

Re: Strange error

BoudewijnEctor4-Aug-03 23:00

BoudewijnEctor

4-Aug-03 23:00

OK,

I'll try: wait a moment

Re: Strange error

BoudewijnEctor4-Aug-03 23:06

BoudewijnEctor

4-Aug-03 23:06

I'm sorry, doesn't work

DO you have got some other idea's

I'll put the code of my first window, wich will have to receive the message, below this text.

void CF2FDlg::ga_naar_IOscherm(Cmodeprop C)<br />
{	<br />
	IOschermclass *iosclass;<br />
	iosclass=new IOschermclass();<br />
	iosclass->set_properties(C);<br />
	//IOschermclass *ios=new IOschermclass();<br />
	//ios->set_properties(C);		//Pass the selected filter\option\converter<br />
	//ios->set_hoofdscherm(this); //send this Dialog, to make sure we can press the cancel button in the next screen<br />
	<br />
	INT_PTR nRet = -1;<br />
	//nRet=ios->DoModal();<br />
	nRet=iosclass->DoModal();<br />
<br />
<br />
<br />
	switch(nRet)<br />
	{<br />
		case IDCANCEL:<br />
		{<br />
			return;<br />
		}<br />
		case IDC_stop:<br />
		{<br />
			break;<br />
		}<br />
		<br />
		case 1:<br />
		{<br />
			return;<br />
		}<br />
		default:<br />
		{<br />
			return;<br />
		}<br />
	};<br />
	<br />
	<br />
	return;<br />
}<br />

Re: Strange error

BoudewijnEctor4-Aug-03 23:08

BoudewijnEctor

4-Aug-03 23:08

I'm sorry, doen't work

DO you have got some other idea's<br />
<br />
I'll put the code of my first window, wich will have to receive the message, below this text.<br />
<br />
<br />
void CF2FDlg::ga_naar_IOscherm(Cmodeprop C)<br />
{ <br />
IOschermclass *iosclass;<br />
iosclass=new IOschermclass();<br />
iosclass->set_properties(C);<br />
//IOschermclass *ios=new IOschermclass();<br />
//ios->set_properties(C); //Pass the selected filter\option\converter<br />
//ios->set_hoofdscherm(this); //send this Dialog, to make sure we can press the cancel button in the next screen<br />
<br />
INT_PTR nRet = -1;<br />
//nRet=ios->DoModal();<br />
nRet=iosclass->DoModal();<br />
<br />
<br />
<br />
switch(nRet)<br />
{<br />
case IDCANCEL:<br />
{<br />
return;<br />
}<br />
case IDC_stop:<br />
{<br />
break;<br />
}<br />
<br />
case 1:<br />
{<br />
return;<br />
}<br />
default:<br />
{<br />
return;<br />
}<br />
};<br />
<br />
<br />
return;<br />
}<br />

Re: Strange error

BoudewijnEctor5-Aug-03 1:33

BoudewijnEctor

5-Aug-03 1:33

I just solved the problem... I thought you might like to know how I did it,, but I don't understand it myself --> when I removed the setproperties call, everything worked okay.
The program must have had the problems because of that crash, although it is just a very simple function:

Th second screen has an own object of type Cmodeprop, with setproperties you povide an object to get passed to the second window. It is something like this:

set_properties (Cmodeprop C)<br />
{<br />
  own_props=C;<br />
return;<br />
}

This is really strange (microsoft!!!)

Re: Strange error

Bob Stanneveld5-Aug-03 4:40

Bob Stanneveld

5-Aug-03 4:40

That sure is strange! Well, At least you solved it! Smile | :)

.
I once had a strange assertion in my program. It took me 3 days to solve it Dead | X|

!

(by the way, Cmodeprops is probaly a class, did you write a copy constructor? or overload the operator=? It might solve something!)

Good luck...

Re: Strange error

Vitali Halershtein4-Aug-03 2:37

Vitali Halershtein

4-Aug-03 2:37

Hello,

I had a similar error. Try "Rebuild All"

Re: Strange error

BoudewijnEctor4-Aug-03 2:43

BoudewijnEctor

4-Aug-03 2:43

Let me try........

No doesn't work:

I've pressed clean solution under BUILD, ad then Rebuild Solution. After trying again I got the same error Mad | :mad:

Re: Strange error

Vitali Halershtein4-Aug-03 2:56

Vitali Halershtein

4-Aug-03 2:56

It is strange Eek! | :eek:

Difficult say more without seeing project settings and code...

Vitali

Re: Strange error

BoudewijnEctor4-Aug-03 2:59

BoudewijnEctor

4-Aug-03 2:59

I've put some code on this forum (this thread at 8:37), please take a look

Re: Strange error

BoudewijnEctor4-Aug-03 3:24

BoudewijnEctor

4-Aug-03 3:24

Thakns, but I don't think this will make a change ?

Re: Strange error

Vitali Halershtein4-Aug-03 3:21

Vitali Halershtein

4-Aug-03 3:21

Normal code;)

Some comment:
Replace :
IOschermclass *iosclass= new IOschermclass();
INT_PTR nRet = -1;
nRet=iosclass->DoModal();
to
IOschermclass iosclass;
int nRet=iosclass.DoModal();

May be you doing "something artful" in this dialog?

Vitali

Creating a process and capturing output

Anonymous4-Aug-03 1:44

Anonymous

4-Aug-03 1:44

I am building a MFC based program that will first run a series of pings and then NET VIEW command to see which users are online. I have already been able to create a process to run ping.exe, but how can I run NET VIEW and capture the output? I've been digging information, and my head is spinning. Not even coffee helped :P How to capture output from CreateProcess()?

Re: Creating a process and capturing output

Anonymous4-Aug-03 1:51

Anonymous

4-Aug-03 1:51

Поцелуй свой поток в зад!!!

Re: Creating a process and capturing output

Arjan Schouten4-Aug-03 2:08

Arjan Schouten

4-Aug-03 2:08

Use a Pipe to redirect the output to your window;

See CreatePipe, STARTUPINFO and CreateProcess.

Arjan.

Re: Creating a process and capturing output

Anonymous4-Aug-03 3:39

Anonymous

4-Aug-03 3:39

Thank you for the reply. It led me to find an article named "Creating a child process with redirected input and output", which is exactly what I wanna do Smile | :)

any suggestion?

zeki yugnak4-Aug-03 1:07

zeki yugnak

4-Aug-03 1:07

Hi,

I'm studying C++, VC++, COM. I would like to know real world examples of various assignments programmers have worked on. Confused | :confused:

For example, what the application did what role did they play. The examples would be using these kinds of technologies. If any programmers could provide some insight into their "real world VC++, MFC, COM experiences it would be very helpful. Any one who has worked on large scale apps, developing controls, database interfaces, or anything else they have done using these technologines, who can lend some insight into how they real world of programming is.

Re: any suggestion?

David Chamberlain4-Aug-03 4:01

David Chamberlain

4-Aug-03 4:01

My first "real" job was in a manufacturing environment, (before C++ and MFC was even a smile on someone's face), where numerically controlled machine tools produced parts for larger assemblies. Since each machine had a special set of codes that caused it to perform specific actions, there was a compiler that would translate the commands to create a part into the machine codes to control the machine.

My job as a programmer was to "update" the compiler and make it work on the new computing platform that was being installed as part of the shop floor overhaul. The legacy code was written in FORTRAN IV, and we were also updating it to F77 on the new computer, in addition to cleaning up as much of the "bad" software as we could. Ever done string processing in FORTRAN? Ouch!!

Since the new computer was much newer than the computer that ran the legacy code, there were some new options available for producing graphics, so I also developed a graphical display of the paths that the machines would follow given the codes that were produced from the compiler for the parts that were being made. Reviewing the graphics output saved the time and trouble of setting the machines up to create a test piece, to see if the part program was really correct.

That was only my first job, and it lasted several years. Much of the experience, though, wasn't so much about programming as it was about manufacturing. The compiler and graphics software never stood on its own, but was an integral part of the manufacturing process. That process had to be understood to make the software fit in.

Very good question, too, and I hope you get some good stories and insights.

Dave

"You can say that again." -- Dept. of Redundancy Dept.

CRecentFileList

Anonymous4-Aug-03 0:18

Anonymous

4-Aug-03 0:18

I want to use CRecentFileList as a convenient way of storing some data for my program. As a test, I wrote a console app that creates a CRecentFileList object. I add some strings to it using the Add() method and then use the [] operator to read the strings. Everything works OK until I try to save the data to the registry using the WriteList() method. I get an access violation.

Is there something I'm doing wrong? Must I write my own class to do it? Using CRecentFileList is easier and quicker but I do not think I am really using it as it was intended. It is a shame it isn't a specialization of a class that I could use for my intended purpose.

Re: CRecentFileList

HPSI4-Aug-03 0:36

HPSI

4-Aug-03 0:36

The WriteList() method requires a CWinApp object, as you can see from the code:

void CRecentFileList::WriteList()
{
    ASSERT(m_arrNames != NULL);
    ASSERT(!m_strSectionName.IsEmpty());
    ASSERT(!m_strEntryFormat.IsEmpty());
    LPTSTR pszEntry = new TCHAR[m_strEntryFormat.GetLength()+5];
    CWinApp* pApp = AfxGetApp();
    pApp->WriteProfileString(m_strSectionName, NULL, NULL);
    for (int iMRU = 0; iMRU < m_nSize; iMRU++)
    {
        wsprintf(pszEntry, m_strEntryFormat, iMRU + 1);
        if (!m_arrNames[iMRU].IsEmpty())
        {
        	pApp->WriteProfileString(m_strSectionName, pszEntry,
        		m_arrNames[iMRU]);
        }
    }
    delete[] pszEntry;
}

The good news is that WriteList() is virtual, so you could probably just rewrite this one method to make it work.

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