C / C++ / MFC Discussion Boards

Re: Changing text color in static text control

AJarrett6-Jun-03 10:49

AJarrett

6-Jun-03 10:49

Silly me, searching on just WM_CTLCOLOR. Blush | :O

I see COLORSTATIC is restricted to a thread, but I can work around that.

Many thanks, John. Between you and kuphryn I feel the Force may be with me again.

increasing sequence number on raw socket

Kuniva6-Jun-03 5:16

Kuniva

6-Jun-03 5:16

I have a raw socket and i construct its IP and TCP header myself. The TCP header is like the following:

#pragma pack(1)
struct tcpheader {
	unsigned short int th_sport;
	unsigned short int th_dport;
	unsigned int th_seq;
	unsigned int th_ack;
	unsigned char th_x2:4, th_off:4;
	unsigned char th_flags;
	unsigned short int th_win;
	unsigned short int th_sum;
	unsigned short int th_urp;
}; /* total tcp header length: 20 bytes (=160 bits) */

Now when i want to send a packet i fill in all the values and everything works great. I use a packet capturer to check if the values i filled in were actually the values transmitted. Now the problem is that i send packets in a while loop and everytime i increase the sequence number by one like this:

while (!kbhit())
{
    // Send The Packet
    if (sendto(s, datagram, 40, 0, (SOCKADDR *)&sin, sizeof(sin)) == SOCKET_ERROR)
    {
        printf("sendto() failed: %d\n", WSAGetLastError());
        return -1;
    }
    printf(".");
    Sleep(1000);
    tcph->th_seq++;
}

When i check the packets in my capture program i see that the first packet is in order if i set tcph->th_seq to 0. But if i use another value like 7000000 i see much larger number in my capture program, and also if the code increments from 0, the sequence number doesn't rise by 1 every packet but with A LOT more (the second packets sequence number is 16777216!). Could anyone explain why its not just incrementing by 1 each time, and how can i set the sequence number to the value i want?

Many thanks in advance

Kuniva
--------------------------------------------

Re: increasing sequence number on raw socket

Mike Nordell6-Jun-03 8:42

Mike Nordell

6-Jun-03 8:42

Kuniva wrote:
if the code increments from 0, the sequence number doesn't rise by 1 every packet but with A LOT more (the second packets sequence number is 16777216!).

Boy are you gonna feel stupid now. ;->

Have you checked what that number is in hex? Does 0x01000000 ring any bells? Network byte order and host byte order is a mismatch on IA32. Now start using htonl and ntohl.

Re: increasing sequence number on raw socket

Kuniva6-Jun-03 11:19

Kuniva

6-Jun-03 11:19

lol! I don't feel stupid actually, i figured it would be something like that hehe Smile | :)

Thanks a lot for the help Big Grin | :-D

Kuniva
--------------------------------------------

Zlib for Dos

WAQAS AHMED6-Jun-03 4:15

WAQAS AHMED

6-Jun-03 4:15

I have compiled ZLib source code in turbo c 3.0?
I want to use it on MSDOS for compressing and uncompressing the files.
My question is that
Is it possible to run ZLib code on MSDOS.

v
f
dssg
dsfg
dfsgsd
f

microsoft dialog with tabctrl wanted

Tibor Blazko6-Jun-03 3:59

Tibor Blazko

6-Jun-03 3:59

does anybody know any ms dialog with tabctrl?
(the best with more ones to be sure it is dialog and not property sheet)
f.e. i found word97/options but fantastic spy++ shows it like control-less (except one button and few scrollbars all own drawing?)
t!

(main problem: http://www.codeproject.com/script/comments/forums.asp?msg=516785&forumid=1647#xx516785xx[^])

how to use the srand function???

siong6-Jun-03 3:06

siong

6-Jun-03 3:06

I want to randomly generate a number for the certain range of number??? How?? Help me Confused | :confused:

Re: how to use the srand function???

David Chamberlain6-Jun-03 3:29

David Chamberlain

6-Jun-03 3:29

Most random number generators will provide a number between 0 and 1. If you want to produce numbers between 15 and 20, for example, the difference is 5 (20 - 15), and the offset is 15. So, generally, if you take rand()*5 + 15 you'll get numbers between 15 and 20.

rand() * range + offset

Dave

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

Re: how to use the srand function???

Anonymous6-Jun-03 4:00

Anonymous

6-Jun-03 4:00

better in this case will be

rand()%(range+1) + offset;

use srand to initial your randomgenerator

Heiko

Convert CString to char *

Vassili6-Jun-03 3:01

Vassili

6-Jun-03 3:01

How can I convert a CString to a char * variable?

CString str;
char *szBuffer;

//code
.
.
.
szBuffer = (const char *) str; //why does this not work, and what do I have to do?

Re: Convert CString to char *

Anonymous6-Jun-03 3:32

Anonymous

6-Jun-03 3:32

Use the getBuffer function.

Re: Convert CString to char *

Rage6-Jun-03 3:41

Rage

6-Jun-03 3:41

CString str;
TCHAR *szBuffer=(LPTSTR)(LPCTSTR)str;

~RaGE();

Re: Convert CString to char *

jhwurmbach6-Jun-03 4:35

jhwurmbach

6-Jun-03 4:35

Rage wrote:
TCHAR *szBuffer=(LPTSTR)(LPCTSTR)str;

This only works is you do not write into the CString.
If you really need to write into it, you have to use GetBuffer()/ReleaseBuffer().

My opinions may have changed, but not the fact that I am right.

Re: Convert CString to char *

Rage6-Jun-03 5:21

Rage

6-Jun-03 5:21

Yep, I know, but in his initial example he tried to typecaste in a const char *, so ...

~RaGE();

Re: Convert CString to char *

jhwurmbach6-Jun-03 5:27

jhwurmbach

6-Jun-03 5:27

Yeah, but that type of stuff IS really dangerous.
It works once you understood when to use it (at a InsertItem() with a LVITEM / TVITEM.pszText for example).
But IMHO it is nothing to tell beginners. Shhhh! Big Grin | :-D

My opinions may have changed, but not the fact that I am right.

Re: Convert CString to char *

Michael Dunn6-Jun-03 9:08

Michael Dunn

6-Jun-03 9:08

NO NO NO.

Please don't encourage people to throw casts in without understanding the initial cause of their problem. The GetBuffer() method exists for precisely this case.

--Mike--
Latest blog entry: *drool* (Alyson) [May 10]
Ericahist | Homepage | RightClick-Encrypt | 1ClickPicGrabber
"You have Erica on the brain" - Jon Sagara to me

Where to find common toolbar xp icons?

Nicolas Bonamy6-Jun-03 2:37

Nicolas Bonamy

6-Jun-03 2:37

Hello I am looking for a source to get the common toolbar xp icons as described here[^]. I am really looking for the source files because I want to use them with alpha blending so I really need the transparency channel and it won't work if I just screencap and crop. I have been looking for them in systems DLL without luck.

Does anyone know?

Regards,
Nicolas

?????CListCtrl????

Stefcos6-Jun-03 1:59

Stefcos

6-Jun-03 1:59

hey all,
i'm a beginner and have one problem.
I want to program a CListCtrl(report-view) object with the resource-editor within a non-modal dialog. Always when I declare a variable with the assistent for the object(CListCtrl variable), i get a DEBUG ASSERTION FAILED during carring out my application. Why?????
The same Project within a modal dialog works fine.
Can everybody help me???
thanks

Stefcos

Re: ?????CListCtrl????

David Crow6-Jun-03 2:27

David Crow

6-Jun-03 2:27

What is the file and line # of the fired assertion?

Move desktop icons

Jarek G6-Jun-03 1:58

Jarek G

6-Jun-03 1:58

Is there a easy way to acces desktop icons and move them around in x and y pos?
I think I saw a program that did that a while ago.

/Jarek

He believed the commercials that said drink beer, get laid
but at closin' time he was alone, he didn't get paid.
Last night his lover was a razorblade..
"Dan Reed song Mix it up"

What do you want to patch today?

Re: Move desktop icons

David Crow6-Jun-03 2:29

David Crow

6-Jun-03 2:29

How about getting a handle to the desktop window, and enumerating its child windows?

Re: Move desktop icons

Jarek G6-Jun-03 22:00

Jarek G

6-Jun-03 22:00

Okey sounds interessting but do you have some sample code or an example?
I never did it before!

/Jarek

He believed the commercials that said drink beer, get laid
but at closin' time he was alone, he didn't get paid.
Last night his lover was a razorblade..
"Dan Reed song Mix it up"

What do you want to patch today?

Re: Move desktop icons

David Crow9-Jun-03 2:39

David Crow

9-Jun-03 2:39

Something like:

HWND hDesktop = GetDesktopWindow();
EnumChildWindows(hDesktop, EnumProc, 0);

BOOL CALLBACK EnumProc( HWND hWnd, LPARAM lParam )
{
return TRUE; // to continue enumeration
}

I've not ever needed to do something like this before, but I suspect it will return more windows than just the icons. Top-level applications probably have the desktop as their parent window, too.

Re: Move desktop icons

Jarek G9-Jun-03 3:22

Jarek G

9-Jun-03 3:22

Thank you David!
I tryed that to Smile | :)

and its just like you said it return manny windows, to manny.
But the search goes on I found a VB program that doing this and I am on my way to disassamble the code!

I think I have something to learn here It started as an effort to make a funny program but now its a chalange!

/Jarek

He believed the commercials that said drink beer, get laid
but at closin' time he was alone, he didn't get paid.
Last night his lover was a razorblade..
"Dan Reed song Mix it up"

What do you want to patch today?

Re: Move desktop icons

David Crow9-Jun-03 5:36

David Crow

9-Jun-03 5:36

Try this:

LPMALLOC pMalloc;
LPSHELLFOLDER pDesktopFolder = NULL;
HRESULT hResult;
LPITEMIDLIST pidlItems = NULL;
LPENUMIDLIST ppenum = NULL;
ULONG celtFetched;
SHFILEINFO fi = {0};

hResult = SHGetMalloc(&pMalloc);
if (NOERROR == hResult)
{
hResult = SHGetDesktopFolder(&pDesktopFolder);
if (NOERROR == hResult)
{
hResult = pDesktopFolder->EnumObjects(NULL, SHCONTF_FOLDERS | SHCONTF_NONFOLDERS, &ppenum);
if (NOERROR == hResult)
{
while (hResult = ppenum->Next(1, &pidlItems, &celtFetched) == S_OK && (celtFetched) == 1)
{
SHGetFileInfo((const char *) pidlItems, 0, &fi, sizeof(fi), SHGFI_PIDL | SHGFI_ICON | SHGFI_DISPLAYNAME);

TRACE2("Icon handle for ]%s[ = %#x\n", fi.szDisplayName, fi.hIcon);

pMalloc->Free(pidlItems);
}

ppenum->Release();
}

pDesktopFolder->Release();
}
}

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