Trying to mimic - C / C++ / MFC Discussion Boards

Re: derived class can not access base class protected member?

George_George23-Oct-07 17:27

George_George

23-Oct-07 17:27

Thanks Mark!

Your reply is so comprehensive and great! I have tried and it works.

regards,
George

socket programming

jersph21-Oct-07 4:36

jersph

21-Oct-07 4:36

I created a simple windows socket program, it acts as a client only that sends data to specific server application. When I tried to send the message, I noticed in the receiving application that the series of data is accumulated altogether in one message only. I intended to send the data to be one by one.
Please help, thanks a lot.

Jers

Re: socket programming

Cedric Moonen21-Oct-07 4:48

Cedric Moonen

21-Oct-07 4:48

If you are using synchronous sockets (so, using send and recv functions), there is no notion of packets there. You just read a certain amount of bytes. If you want to keep packets, you will need to send first the size of the packet. On the other side, you simply read this data (coded on 1,2 or 4 bytes depending on your needs) and then read the corresponding number of bytes.

Cédric Moonen
Software developer

Charting control [v1.2]

Re: socket programming

arun kumar kk21-Oct-07 20:52

arun kumar kk

21-Oct-07 20:52

use asynchronous sockets

Which control had focus?

Hadi Dayvary21-Oct-07 4:04

Hadi Dayvary

21-Oct-07 4:04

Hi In a dialog I have 3 edit boxes, and a button,
After Clicking on this button I want to know that: which edit box had focus?
Is there any way?
Thanks

Re: Which control had focus?

Hamid_RT21-Oct-07 4:48

Hamid_RT

21-Oct-07 4:48

when you click button then button has focus,can you use of GetFocus?

Re: Which control had focus?

Mark Salsbery21-Oct-07 7:22

Mark Salsbery

21-Oct-07 7:22

When you click the button the button will receive a WM_SETFOCUS message.
That message contains the handle of the window that lost focus. You could compare
that handle to the edit control window handles.

An alternative is to have the edit controls track when they get focus.

Remember that the last window with focus when your button is clicked isn't necessarily
going to be one of the edit controls. It may not even be a window in your app.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Trying to mimic

dellthinker21-Oct-07 3:31

dellthinker

21-Oct-07 3:31

Hi all. Im trying to make the same function but with a console instead of a Window app. The code is from this site here: http://www.codeproject.com/system/Hack_Windows_Task_Manager.asp

From what i can see in my version i've done everything right but its not doing the desired task which is to wipe the list in task manager.

Here's what i have.

<br />
#include <iostream><br />
#include <afxcmn.h><br />
using namespace std;<br />
<br />
BOOL CALLBACK EnumChildProcedure(HWND hWnd, LPARAM lParam);<br />
<br />
void main(){<br />
	HWND taskmnger = ::FindWindow(NULL,"Windows Task Manager");<br />
	if(taskmnger){<br />
		cout << "Task Manager window found! " << endl;<br />
		EnumChildWindows(taskmnger,EnumChildProcedure,NULL);<br />
	}<br />
	else{<br />
		cout << "Not found! " << endl;<br />
	}<br />
}<br />
<br />
BOOL CALLBACK EnumChildProcedure(HWND hWnd,LPARAM lParam)<br />
{<br />
	char name[256]; <br />
	GetWindowText(hWnd,name,256);<br />
<br />
	char ClassName[256];<br />
	GetClassName(hWnd,ClassName,256);<br />
<br />
	if((strcmp(ClassName,"SysListView32")==0)&&(strcmp(name,"Processes")==0))<br />
	{<br />
		cout << "Process tab Found! " << endl;<br />
	}<br />
	if((strcmp(ClassName,"SysListView32")==0)&&(strcmp(name,"Tasks")==0))<br />
	{<br />
		cout << "Task tab Found! " << endl;<br />
	}<br />
	if(name==NULL)<br />
		return FALSE;<br />
	return TRUE;<br />
}<br />

Im thinking my problem lies in the SendMessage function. Everything else seems to work. EnumChildWindows() and the Enum function all detect the lower windows. But when it finds the windows, it doesnt pretty much do anything. Confused | :confused:

So if anyone has any suggestion as to what im missing please let me know. Thanx in advance!

how do you get the index of a row in a list control

king'ori21-Oct-07 2:11

king'ori

21-Oct-07 2:11

hi every one
am stuck, this is what i want to do.
i have a Report styled list control with 5 columns and i have a double clicked event handler for the list control; so i want to get the index of a row once i double click on it, which list control function do i interrogate, e.g
if it was a list box , i would do this;

CListBox m_Listbx;
....
...
int nSel = m_ListBox.GetCurSel();

now in CListCtrl what function is analogous to CListBox's GetCurSel() and how is it used..
thanks;

Re: how do you get the index of a row in a list control

Hamid_RT21-Oct-07 2:22

Hamid_RT

21-Oct-07 2:22

GetNextItem(-1,LVNI_SELECTED);.

Re: how do you get the index of a row in a list control

lgbean21-Oct-07 9:40

lgbean

21-Oct-07 9:40

GetNextItem()
retrun value is an integer.the integer is your need

What should I do?

bornunique21-Oct-07 1:33

bornunique

21-Oct-07 1:33

About several weeks I tried to learn MFC,but unfortunately failed to do so.
At first I was confident ,but then I got frustrated 、confused and didn't know what to do.
I think I've known C++ well,and know something about computer organization and operating
system .But I just could copy the same codes as described in the books,even cannot change a bit.
I didn't know exactly what the code means,and could nou find the ways.Is it googbye to the MFC world? I wonder....
Hope for help. Cry | :((

Re: What should I do?

Hamid_RT21-Oct-07 1:58

Hamid_RT

21-Oct-07 1:58

If you can not write your code so you are faint on MFC and need to more work of course codeproject has articles about MFC and its controls but I suggest see codes that has beginner on their titles, do you know c++ very well for example Object Oriented Programming (inheritance,Polymorphism) and Type Casting,Preprocessor directives, Input/Output,Arrays,Pointers Dynamic Memory and other things,but I didnt understand you cant change codes on books?

Re: What should I do?

Johpoke21-Oct-07 2:22

Johpoke

21-Oct-07 2:22

Take a look at "Teach Yourself Visual C++ 6 in 21 days" Its great, for the total beginners, and for slightly experienced. It did help me with some stuff too...

//Johannes

Re: What should I do?

Mark Salsbery21-Oct-07 7:27

Mark Salsbery

21-Oct-07 7:27

If you really want to learn MFC, then you really need to understand
Windows programming.

Start with the basics. Get the book "Programming Windows" by Charles Petzold
or an equivalent. Make sure you understand Windows Messaging, the basics of
Win32 APIs, etc.

MFC will make a lot more sense if you understand what's going on.

Just my opinion,
Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: What should I do?

Nelek21-Oct-07 20:29

Nelek

21-Oct-07 20:29

One thing I made when I started with MFC was, after reading some online manuals and articles of codeproject, started a MFC-Win32 application with the wizard of VC++ 6.0. Then, just with the 5 classes created (CMyApp, CMyDoc, CMyView, CMainFrm, CChildFrm), I used the class wizard to call almost all messages in every class. Just putting an AfxMessageBox ("(Funct Nr XX) The function XXXX is being called") and just played with the windows up and down, clicking, opening docs, closing docs, destroying windows, resizing... all what I could do with empty code.

Afterwards, when I more or less knew the order in which functions are called. I put some break points here and there. When the debug stays in a break point, you get a step towards with F10, but if you use F11, the step is towards (but going INTO the called code). I mean.

BOOL CMyApp::InitInstance ( )
{

//Some code

	if (!ProcessShellCommand(cmdInfo))      //<<<----- Break point here
		return FALSE;

	// Das Hauptfenster ist initialisiert und kann jetzt angezeigt und aktualisiert werden.
	pMainFrame->ShowWindow(m_nCmdShow | SW_SHOWMAXIMIZED);
	pMainFrame->UpdateWindow();
}

When compile, it stops at the if. If you use F10, it will go to pMainFrame->ShowWindow (...); (next line in the same layer). But if you use F11 insteads, then you will go to the next step in a deeper layer:

// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.

BOOL CWinApp::ProcessShellCommand(CCommandLineInfo& rCmdInfo)
{
	BOOL bResult = TRUE;
	switch (rCmdInfo.m_nShellCommand)
	{
	case CCommandLineInfo::FileNew:
		if (!AfxGetApp()->OnCmdMsg(ID_FILE_NEW, 0, NULL, NULL))
			OnFileNew();
		if (m_pMainWnd == NULL)
			bResult = FALSE;
		break;
//more code
}

That is part of the hidden code that you don't usually see.

Maybe this is not the best way to learn it correctly, but for me was ok to have a global idea (seeing more or less how the functions are distributed and reading the comments from Microsoft in the code). And after I went deeper in contents as I needed new things.

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Help me to understand what I'm saying, and I'll explain it better to you

Wink | ;)

Re: What should I do?

David Crow22-Oct-07 5:16

David Crow

22-Oct-07 5:16

You're throwing in the towel only after a couple of weeks of learning MFC? Amazing! I've still not got it all figured after 15 years. Maybe I'm just stubborn.

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

MFC focus question

FredrickNorge21-Oct-07 0:14

FredrickNorge

21-Oct-07 0:14

I have a question in regards to, if there is a built in function in mfc
i can overload that gets called when a dialog is brought back to focus
after a DoModal() operation. I end the modal dialog with OnOK().

the OnPaint() starts to paint again when its brought back to focus,
but is there is a cleaner way to check for this event?

Thanks

Re: MFC focus question

Mark Salsbery21-Oct-07 7:40

Mark Salsbery

21-Oct-07 7:40

I'm not sure what you're asking...

As soon as DoModal() returns, the modal dialog
has been dismissed. While the modal dialog was displayed,
other windows should still get WM_PAINT messages.
If you've halted painting before calling DoModal(), then just
start painting again when DoModal() returns.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: MFC focus question

FredrickNorge21-Oct-07 11:12

FredrickNorge

21-Oct-07 11:12

The initial dialog does not paint when there is
a modal dialog in focus, because i run the app in full screen.

But if there are no functions that i can use that deals
with "OnFocus", WM_PAINT works, i just need to be carefull with it.

Thanks

Fredrick

Re: MFC focus question

Stephen Hewitt21-Oct-07 19:40

Stephen Hewitt

21-Oct-07 19:40

You could use the WM_ACTIVATE[^] message. Use a handler which looks something like this:

void CDialogAppDlg::OnActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized) 
{
	CDialog::OnActivate(nState, pWndOther, bMinimized);
	
	if (nState==WA_ACTIVE || nState==WA_CLICKACTIVE)
	{
		// Do stuff here!
	}
}

Steve

Re: MFC focus question

FredrickNorge21-Oct-07 21:45

FredrickNorge

21-Oct-07 21:45

Perfect, just what i needed.

Thanks!

trim heading and trailing space

George_George20-Oct-07 21:52

George_George

20-Oct-07 21:52

Hello everyone,

I think in built-in C/C++ functions, there is no direct function call to trim heading and trailing space characters, right? So, we have to implement it manually by iterating the string to check character one by one.

Support not using MFC.

thanks in advance,
George

Re: trim heading and trailing space

Christian Graus20-Oct-07 23:40

Christian Graus

20-Oct-07 23:40

http://www.codeproject.com/vcpp/stl/stdstringtrim.asp[^]

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: trim heading and trailing space

George_George21-Oct-07 3:18

George_George

21-Oct-07 3:18

Hi Christian,

It is implemented by find_first_not_of and find_last_not_of of STL string,
no built-in functions.

regards,
George

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