C / C++ / MFC Discussion Boards

Re: How to start Visual C++?

David Crow1-Nov-07 2:52

David Crow

1-Nov-07 2:52

xelontr wrote:
Where should i start?

By reading a good book on the subject. Petzold's book is always a respectable choice.

"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

Re: How to start Visual C++?

saravana0011-Nov-07 2:58

saravana001

1-Nov-07 2:58

u better go for SAMS "Teach urself VC++ in 21 days" book by Davis chapman.Very good book for all beginners in vc++..

Re: How to start Visual C++?

chandu0041-Nov-07 3:18

chandu004

1-Nov-07 3:18

13 essential skills in vc++ by steven holzner is also good for hte beginners.

Re: How to start Visual C++?

Nemanja Trifunovic1-Nov-07 3:36

Nemanja Trifunovic

1-Nov-07 3:36

For Win32, see the Petzold's book[^], and for MFC, the Prosise's one[^]

Programming Blog
utf8-cpp

Re: How to start Visual C++?

jp-mocs1-Nov-07 7:13

jp-mocs

1-Nov-07 7:13

Everyone was a newbie once...

There are MANY (legions) of books available... I wouldn't promote piracy (no, not me!), but several are even available in various places on the net, if you know where to look...

Teach Yourself Visual C++ in 21 Days (ambitious title)
Visual C++ Unleashed
etc...

Both take you step by step through different projects and teach you WHAT you can do so you can learn HOW to do it...

If you are like me, you would want a real-print version of the book so you can thumb through it...

Good luck!

=->Mocs<-=

problem showing while i m making the dialog

dobhal.mca1-Nov-07 0:50

dobhal.mca

1-Nov-07 0:50

HI.ALL
I M GETTING THIS PROBLEM......
c:\program files\microsoft visual studio\myprojects\dialog1\dialog1dlg.cpp(4) : fatal error C1083: Cannot open precompiled header file: 'Debug/dialog1.pch': No such file or directory

Clicking on error.it points to

#include "stdafx.h"

and my code is this.....

void CDialog1Dlg::OnAdd()
{
// TODO: Add your control notification handler code here

CString strTitle ;
int nIndex;

UpdateData(); // Transfer data from controls to variables

//get currently selected text
nIndex = GetDlgItemText(IDC_TITLE, strTitle); //assigning selected
m_strFullName = strTitle + " " + m_strFirstName + " " + m_strLastName;

m_NameList.AddString(m_strFullName); //Add string to list

UpdateData(FALSE); // Transfer data from variables to controls
}

SKDOBHAL

Re: problem showing while i m making the dialog

super_ttd1-Nov-07 1:10

super_ttd

1-Nov-07 1:10

#include "stdafx.h" must be the first include statement before the others

Re: problem showing while i m making the dialog

Hamid_RT1-Nov-07 1:20

Hamid_RT

1-Nov-07 1:20

See here[^].

Re: problem showing while i m making the dialog

David Crow1-Nov-07 2:54

David Crow

1-Nov-07 2:54

Does this error happen even with a Rebuild All?

how to cut a segment from an image?

King Tran1-Nov-07 0:49

King Tran

1-Nov-07 0:49

using VC++, how to cut a rectangle segment picture from an bmp format image?
and the cutting rectangle can has diffrent angle. my mean is that the cutted image is certainly rectangle, and the cutting segment is also rectangle, but the tow rectangles are not parallel, there is a rotated angle between them.

thanks

Re: how to cut a segment from an image?

Hamid_RT1-Nov-07 1:43

Hamid_RT

1-Nov-07 1:43

See this code

   CDC m_dc,m_dc2;

   m_dc.CreateCompatibleDC(GetDC());
   m_dc2.CreateCompatibleDC(GetDC());

   HBITMAP hbit=CreateCompatibleBitmap(GetDC()->m_hDC,800,600);
   HBITMAP hbit2=CreateCompatibleBitmap(GetDC()->m_hDC,800,600);
   hbit=(HBITMAP)m_dc.SelectObject(hbit);
   hbit2=(HBITMAP)m_dc2.SelectObject(hbit2);

   hbit=(HBITMAP)LoadImage(NULL, _T("c:\\1234.bmp"), IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
   hbit=(HBITMAP)m_dc.SelectObject(hbit);
   m_dc.TextOut(0,0,_T("And is this your answer"),23);

m_dc2.BitBlt(300,300,200,200,&m_dc,0,0,SRCCOPY);
   hbit2=(HBITMAP)m_dc2.SelectObject(hbit);

   CImage m_Image;
   m_Image.Attach(hbit2);
   m_Image.Save(_T("e:\\test.bmp"));
   m_Image.Destroy();
   m_dc.DeleteDC();
   m_dc2.DeleteDC();
   DeleteObject(hbit);
   DeleteObject(hbit2);

Re: how to cut a segment from an image?

Mark Salsbery1-Nov-07 5:47

Mark Salsbery

1-Nov-07 5:47

That leaky piece of code helps the OP how?

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

Re: how to cut a segment from an image?

Hamid_RT1-Nov-07 5:59

Hamid_RT

1-Nov-07 5:59

where the problem?

Re: how to cut a segment from an image?

Mark Salsbery1-Nov-07 6:49

Mark Salsbery

1-Nov-07 6:49

Besides the fact that it has nothing to do with the question asked?

Like I stated, it leaks. "Only" one GDI object - you get lucky - the system
cleans up most of the problems. Here's an analysis:

    CDC m_dc,m_dc2;
    
    m_dc.CreateCompatibleDC(GetDC());
    m_dc2.CreateCompatibleDC(GetDC());

    HBITMAP hbit=CreateCompatibleBitmap(GetDC()->m_hDC,800,600);
    HBITMAP hbit2=CreateCompatibleBitmap(GetDC()->m_hDC,800,600);
    hbit=(HBITMAP)m_dc.SelectObject(hbit);
    <font color="Red">// hbit is m_dc's original bitmap
    // m_dc has compatible bitmap 1</font>
    hbit2=(HBITMAP)m_dc2.SelectObject(hbit2);
    <font color="Red">// hbit2 is m_dc2's original bitmap
    // m_dc2 has compatible bitmap 2</font>

    hbit=(HBITMAP)LoadImage(NULL, _T("e:\\8bit.bmp"), IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
    <font color="Red">// hbit is loaded bitmap (m_dc's original bitmap is lost)</font>
    hbit=(HBITMAP)m_dc.SelectObject(hbit);
    <font color="Red">// hbit is compatible bitmap 1
    // m_dc has loaded bitmap</font>
    m_dc.TextOut(0,0,_T("And is this your answer"),23);

    m_dc2.BitBlt(300,300,200,200,&m_dc,0,0,SRCCOPY);
    hbit2=(HBITMAP)m_dc2.SelectObject(hbit);
    <font color="Red">// hbit2 is compatible bitmap 2 (m_dc2's original bitmap is lost)
    // m_dc2 has compatible bitmap 1</font>

    CImage m_Image;
    m_Image.Attach(hbit2);
    m_Image.Save(_T("e:\\8bit_test.bmp"));
    m_Image.Destroy();
    <font color="Red">// compatible bitmap 2 destroyed</font>
    m_dc.DeleteDC();
    m_dc2.DeleteDC();
    DeleteObject(hbit);
    <font color="Red">// compatible bitmap 1 destroyed</font>
    DeleteObject(hbit2);
    <font color="Red">// hbit2 was already destroyed above so this line was useless</font>

    <font color="Red">// loaded bitmap is lost - leak</font>

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

Re: how to cut a segment from an image?

Hamid_RT1-Nov-07 7:00

Hamid_RT

1-Nov-07 7:00

Hey Mark thanks for your help.

Modeless Dialog Box hangs... [modified]

GauranG Shah1-Nov-07 0:40

GauranG Shah

1-Nov-07 0:40

Hi..
Previously I was using Modal dialog box with Thread, to continue one process and showing the dialog box continuously. But as I am getting problem with thread I need to use Modeless dialog Box. But when I replace the code of Modal Dialog box with Modeless Dialog Box. It hangs when redrawn.
i.e. When it redrawns nothing displays in the dialog box.
The Code I am using is as follows
My application is such, that continuously check the data from the server and displys on the dialog.

hDisOwnDlg=CreateDialog( g_hInst, MAKEINTRESOURCE( IDD_DISOWN ), NULL, DisOwnDlgProc );	
ShowWindow(hDisOwnDlg,SW_SHOW);

Please Help me.

-- modified at 10:11 Thursday 1st November, 2007

[ Screen Capture ][ Tool Tip ]

Re: Modeless Dialog Box hangs...

Hamid_RT1-Nov-07 1:06

Hamid_RT

1-Nov-07 1:06

Did you use of any function or event like WM_SIZE on your project? does your previous problem solve?

Re: Modeless Dialog Box hangs...

GauranG Shah1-Nov-07 1:40

GauranG Shah

1-Nov-07 1:40

No i am not using WM_SIZE. and my previos problem hasn't been solved.

[ Screen Capture ][ Tool Tip ]

Re: Modeless Dialog Box hangs...

Mark Salsbery1-Nov-07 5:51

Mark Salsbery

1-Nov-07 5:51

What thread are you creating the dialog on?
What thread do you do the continuous checking on?

Mark

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

Re: Modeless Dialog Box hangs...

GauranG Shah1-Nov-07 18:10

GauranG Shah

1-Nov-07 18:10

I have function that retrives the data from Internet Server throught Socket after some interval and show it on the dialog box. Previously I was using Modal Dialog box, calling this function through thread before creating dialog and termination thread when Dialog Ends.

But I think if I will use the Modeless Dialog box the above thing will be much easy. And So replaced the code of modal dialog box with Modeless Dialog box. But as I told earlier it gets blank when it redrawns.

[ Screen Capture ][ Tool Tip ]

Re: Modeless Dialog Box hangs...

Mark Salsbery2-Nov-07 8:04

Mark Salsbery

2-Nov-07 8:04

Mark Salsbery wrote:
What thread are you creating the dialog on?
What thread do you do the continuous checking on?

Well if you're doing processing on the same thread the modeless dialog
was created on, then that can cause the dialog not to get its
WM_PAINT messages (and any others).

Mark

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

Problem working with Created Local User

narayanagvs1-Nov-07 0:04

narayanagvs

1-Nov-07 0:04

Hi,

I have created a Local User Account programmatically say "MyUser" and then Iam Creating a process as MyUser. From within this process( which means Iam working as "MyUser") I have created a Pdf file and then Iam trying to open it Programmatically using DOS command "cmd /c start myfile.pdf". But the Pdf file is not getting opened. Even when I click on it. It Says "Access denied". The Same file if I login using "MyUser" it is being opened.Then after If Iam trying to Open it Programmatically or Normally I could open the File from my current user Account.

So,Is it a must for me to login as "MyUser" atleast once to work with that user Programmatically?

What I observed is once I login as that user, In Documents and Settings a folder is created under the name "MyUser".

So Is there any thing more I need to do apart from creating a user Programmatically?

Any suggestions would be helpful.

Thanks in Advance.

Today is a gift, that's why it is called the present.

Re: Problem working with Created Local User

Iain Clarke, Warrior Programmer1-Nov-07 2:11

Iain Clarke, Warrior Programmer

1-Nov-07 2:11

Firstly, do you know the freshly created pdf exists?

If so, it probably was created so that only MyUser can open it.

Forgetting acrobat etc - can you copy the file using explorer? If not, then you may need to modify the CreateFile code that MyUser runs to use a security context (one of the params that's usually NULL) to create the file with "everyone can read this" privileges.

*Then* worry about whether the file is decent.

You may even want to start testing by creating a text file with "hello" in it, so you can use simpler software to check things out.

Iain.

Re: Problem working with Created Local User

David Crow1-Nov-07 3:03

David Crow

1-Nov-07 3:03

narayanagvs wrote:
Iam trying to open it Programmatically using DOS command "cmd /c start myfile.pdf".

Why not just use ShellExecute(hWnd, "open", "myfile.pdf", ...)?

Wake On LAN (WOL) Problem

joshiprashant31-Oct-07 23:39

joshiprashant

31-Oct-07 23:39

My application works as below.
Client sends its MAC address and Wait time(in seconds) to server and goes to sleep state.
Server receives them and sleeps for received no. of seconds. After that time period, server sends Magic Packet to client to wake it up.
Now the problem is, if Client sends Wait Time less than 120 seconds, server wakes up the client successfully. But if that time period is 120 or greater than 120, client does not wake up even if server sends magic packet successfully. What could be probable cause for the same.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.