C / C++ / MFC Discussion Boards

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", ...)?

"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

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.

ExecuteQuery of CDatabase not working

prithaa31-Oct-07 22:09

prithaa

31-Oct-07 22:09

Hello,

I have a CDatabase object.But the following ExecuteQuery doesn't work.It gives an error "Syntax error in field definition"

CDatabase CurrentDatabase;
CurrentDatabase.ExecuteSQL("Create Table Purchase (Amt decimal(10,2))");

but
the following works
CurrentDatabase.ExecuteSQL("Create Table Purchase (Amt int)");

I have checked with SQL both the statements have right syntax.
What must be the problem?

Prithaa

Re: ExecuteQuery of CDatabase not working

David Crow1-Nov-07 3:10

David Crow

1-Nov-07 3:10

prithaa wrote:
CurrentDatabase.ExecuteSQL("Create Table Purchase (Amt decimal(10,2))");

Can you execute this statement from within SQL itself? Have you tried:

CurrentDatabase.ExecuteSQL("Create Table Purchase (Amt decimal(10))");

CurrentDatabase.ExecuteSQL("Create Table Purchase (Amt decimal)");

Re: ExecuteQuery of CDatabase not working

prithaa1-Nov-07 23:06

prithaa

1-Nov-07 23:06

Hello,

Thanks for your reply.

I tried te syntax with Access it did not work in Access.
I want to create a table with a float field.I checked the SQL Create command which says decimal(10,2) for decimal values.
But it doesn't seem to work .
What should I do for decimal vlues?

Prithaa

Re: ExecuteQuery of CDatabase not working

David Crow2-Nov-07 2:35

David Crow

2-Nov-07 2:35

prithaa wrote:
I checked the SQL Create command which says decimal(10,2) for decimal values.

It matters not what SQL says about the syntax, as you are creating the table within Access. Check its documents instead.

prithaa wrote:
What should I do for decimal vlues?

Have you tried:

CurrentDatabase.ExecuteSQL("Create Table Purchase (Amt double)");

Updating resource in yourself

LiveShell31-Oct-07 22:06

LiveShell

31-Oct-07 22:06

Hi all,
I am facing strange problem. I am executing A.exe and i wrote code in that binary to update the resource of itself ( that is A.exe itself).. But i am not able to update the resource..Is it permitted ?? I think its not ...even its not giving ny error... whats the problem with it ??

Thnx
LiveShell

Re: Updating resource in yourself

Paresh Chitte31-Oct-07 22:39

Paresh Chitte

31-Oct-07 22:39

Are you using BeginUpdateResource UpdateResource and EndUpdateResource ?

If possible could you please share your code ?

Regards,
Paresh.

Re: Updating resource in yourself

LiveShell31-Oct-07 23:10

LiveShell

31-Oct-07 23:10

yeah m using all these apis.. n even call to api returns successful...so i am amazed..
following is the code snippet

HANDLE hResource = BeginUpdateResource(szCVCreatorFile.c_str(), FALSE);

if(hResource == NULL)
{
return false;
}

if (UpdateResource( hResource,
"LICINFO",
MAKEINTRESOURCE(IDR_LICINFO),
MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL),
pcEncodedData,
uiOutLen) == FALSE)
{
return false;
}

if(EndUpdateResource(hResource, FALSE) == FALSE)
{
return false;
}

Noob need help in c pro..

cue_ball31-Oct-07 21:54

cue_ball

31-Oct-07 21:54

Hi guys.. wanna ask abt a question on c programming.. no c++ or c# but didnt find the right place to post this.. so here goes..

Currently doing a project on c,
aim is to retrived certain field from a .txt file..
my question is do i need to create a structure for that txt file..
if not.. how do i skip a field when readin from a .txt file.??

etc of what in the .txt file
[clientA] [id] [password]
[clientB] [id] [password]

i wanna retrieve the id and password only..

so far i only wanna to opent eh file and print all the info out..
can i use fscanf to do it.

tks guys

the problem i face nw is that the info in the txt file is of different length.
etc.. the clientA name can be 10char n b is 15 char.

i manage to read the strinf from the .txt file and store it into a array[200];
i was tinkin to try to seprate the id and password and store them into different array and use strcmp to check with the user input.

etc from .txt
peter 1111 abcdef
michard 1112 cccbefj

so im tryin to get the id ( 1111 and 1112) out and password abcdef and cccbefj

but im really having a hard time doing so..

Re: Noob need help in c pro..

cue_ball31-Oct-07 21:58

cue_ball

31-Oct-07 21:58

this is what i wrote.. pardon me for such stupid programmin..

#include<stdlib.h>
#include<stdio.h>
#include<io.h>
#include<fcntl.h>
#define EOF (-1)

char passwordchk(char id[],char pw[]);

main()
{
char pw[10];
char id[10];
printf("id:");
gets(id);
printf("\npassword:");
gets(pw);
printf("\nThis if for testing purpose..id=%s\tpw=%s",id,pw);
passwordchk(id,pw);
getchar();
}

char passwordchk(char id[],char pw[])
{
FILE *f;
int i;
int c,count=0;
char buffer[200];
char checker[200];
char id_one[3];
char id_two[3];
char id_three[3];
char one_pw[6];
char two_pw[6];
char three_pw[6];

printf("\nstuff that is pass over to pw function %s,%s\n",id,pw);

f = fopen("passwd.txt", "rt");
while((c=fgetc(f))!=EOF)
{
buffer[count]=c;
count++;
}
printf("\nFrom buffer\n%s",buffer);

fclose(f);
}

Re: Noob need help in c pro..

John R. Shaw31-Oct-07 22:20

John R. Shaw

31-Oct-07 22:20

I love C, it is so simple.

If the file was written using structures, then read it using structures of the same size. Now writing it and reading it does involve structure alignment, but that is no different than any other object/record reading. If the file was created specifically to be read as ‘.txt’ then you sill need to know the format and then read it a line at a time

Look at the problem and do not try to over complicate it. The simplest solution is usually the best solutions.

INTP
"Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra

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