Splitting an Integer into 4 Bytes - C / C++ / MFC Discussion Boards

David Horner9-Apr-04 18:54

9-Apr-04 18:54

Hi,
I'm interested in writing a program that must keep track of the current active window.
I would like to get messages from the OS that tells me when the user switches from app to app.
What is the best way to do this?

Should I use a WM_TIMER and just check what process the current active window belongs to?
(actually, I don't know exactly what function I should use to find the current active window and process)
Or is there a way to hook into something that would notify me on changes?

Samples, comments would be wonderful!

Thanks,
Dave

Re: Active Window?

wuxianzhong9-Apr-04 21:26

wuxianzhong

9-Apr-04 21:26

To use SetWindowsHookEx() to get it!

when to use "AFX_IDP_COMMAND_FAILURE"?

vividtang9-Apr-04 18:03

vividtang

9-Apr-04 18:03

what are those commands whose type is similar to "AFX_IDP_COMMAND_FAILURE"?
When to use it?

PostMessage

sschilachi9-Apr-04 13:32

sschilachi

9-Apr-04 13:32

I have a function that responds to a message by incrementing a counter variable by 1:

OnAction(WPARAM wParam, LPARAM lParam)<br />
{<br />
m_nCounter += 1;<br />
}

The message that it responds to is posted twice using PostMessage, once immediately after the other (like so):

::PostMessage(GetSafeHwnd(),WM_ACTION,0,0);<br />
::PostMessage(GetSafeHwnd(),WM_ACTION,0,0);<br />

The strange thing is that if i modify the function to display a MessageBox with the value of the counter (like so):

OnAction(WPARAM wParam, LPARAM lParam)<br />
{<br />
CString string;<br />
m_nCounter += 1;<br />
string.Format("%d",m_nCounter);<br />
MessageBox(string);<br />
}

I get two message boxes, as I should; however the values in the message boxes are 2 then 1, not 1 then 2.

Howcome I am receiving 2 then 1, rather than 1 then 2 from the message boxes as you would expect?

Any help would be greatly appreciated.

Thanks

Re: PostMessage

Prakash Nadar9-Apr-04 15:13

Prakash Nadar

9-Apr-04 15:13

both the message box comes on together?

as far as i know, message boxes in certain events could be very tough way of debuging the app coz the message boxes starts pumping the messages, so other messages too gets executed.

try TRACE instead.

MSN Messenger.
prakashnadar@msn.com

"If history isn't good, just burn it." - Sidhuism.

Re: PostMessage

Empty198110-Apr-04 1:19

Empty1981

10-Apr-04 1:19

::SendMessage(GetSafeHwnd(),WM_ACTION,0,0);
::SendMessage(GetSafeHwnd(),WM_ACTION,0,0);
<made in="" china="">
if you want to get the result as you say,you should write like these.
when we use postmessage to send the message,the application
only send the message to CWnd,then return,the application does not
wait for the Command to be carried out.
when we use sendmessage to send the message,the appliation return
when the command be carried out.If we does not wait for the command
to be carried out.The message will be save in the message queue,
so the message is FILO,not FIFO
zhengyb@nanjing-fnst.com

EXE Header Info?

Timothy Grabrian9-Apr-04 12:46

Timothy Grabrian

9-Apr-04 12:46

I want to write something like the Sub7 Configure program, where it overwrites some of the values already in the seperate exe.

I've tried changing some of the constant data in the program and saving it but it doesn't work. I think it's because I need to change some of the info in the EXE header.

My problem is that I downloaded a EXE Header info checker and checked a program I made, them I changed some stuff in that program and checked it again and it was all the same!

Any ideas on how I can change what's already in the exe?

P.S. I don't want to use String Table Resources either.

wWw.KruncherInc.cOm - My cool programs

Splitting an Integer into 4 Bytes

sschilachi9-Apr-04 12:16

sschilachi

9-Apr-04 12:16

how do you split an integer variable into 4 byte variables, I'm looking for a function to achieve this.

int i;<br />
byte b1,b2,b3,b4;<br />
<br />
b1 = Byte1(i);<br />
b2 = Byte2(i);<br />
b3 = Byte3(i);<br />
b4 = Byte4(i);

Can anyone help?

Thanks

Re: Splitting an Integer into 4 Bytes

PJ Arends9-Apr-04 12:41

PJ Arends

9-Apr-04 12:41

Many way to do this.

One brute force way is:

b1 = i & 0x000000ff;
b2 = (i & 0x0000ff00) >> 8;
b3 = (i & 0x00ff0000) >> 16;
b3 = (i & 0xff000000) >> 24;

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

Re: Splitting an Integer into 4 Bytes

Roman Nurik9-Apr-04 12:50

Roman Nurik

9-Apr-04 12:50

not a very safe-cast method but who cares it works:

<br />
int i = 12345;<br />
unsigned char byte1 = ((unsigned char*)&i)[0];<br />
unsigned char byte2 = ((unsigned char*)&i)[1];<br />
unsigned char byte3 = ((unsigned char*)&i)[2];<br />
unsigned char byte4 = ((unsigned char*)&i)[3];<br />

r -€

Re: Splitting an Integer into 4 Bytes

grigsoft9-Apr-04 21:46

grigsoft

9-Apr-04 21:46

I will add this one:
int i=12345;
BYTE* ab = (BYTE*)&i;
// use ab[0-3]

Igor Green
http://www.grigsoft.com/ - files and folders comparison tools

Re: Splitting an Integer into 4 Bytes

Prakash Nadar9-Apr-04 22:00

Prakash Nadar

9-Apr-04 22:00

assume i is 2 bytes for simplicity.

int i = 0x1234;
byte c1,c2,

then according to your logic, the output would be like this.
c1 = 0x34; and
c2 = 0x12;
which is wrong.This is because the way it is stored in the memory. and if you consider for 32bit integer value, the error would just double.

and according to PJ
c1 = 0x12; &
c2 = 0x34;
here the output is correct,

hope you got the picture now.

Running my application when Windows starts

Anonymous9-Apr-04 10:56

Anonymous

9-Apr-04 10:56

Where should I place my exe so that it starts running when Windows starts

Re: Running my application when Windows starts

Brian Olej9-Apr-04 11:09

Brian Olej

9-Apr-04 11:09

With Windows XP:

C:\Documents and Settings\You User Name\Start Menu\Programs\Startup

Signature under construction.

Re: Running my application when Windows starts

toxcct9-Apr-04 11:14

toxcct

9-Apr-04 11:14

that depends on the language windows is running...

for the french version, copy you exe into C:\Documents and Settings\"your user name"\Démarrer\Programmes\Démarrage

there should have a way to get this folder directly...

TOXCCT >>> GEII power

Re: Running my application when Windows starts

Prakash Nadar9-Apr-04 15:18

Prakash Nadar

9-Apr-04 15:18

SHGetSpecialFolderLocation(..)

with csidl
CSIDL_DESKTOP

MSN Messenger.
prakashnadar@msn.com

"If history isn't good, just burn it." - Sidhuism.

Re: Running my application when Windows starts

2249179-Apr-04 19:04

224917

9-Apr-04 19:04

All these starts only when user logs in.

another way is to place exe path in

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
or
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

greatest thing is to do wot others think you cant
suhredayan@omniquad.com

messenger :suhredayan@hotmail.com

Re: Running my application when Windows starts

Renjith Ramachandran9-Apr-04 19:38

Renjith Ramachandran

9-Apr-04 19:38

the simplest method is
under the registry
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

create a String type key and put full path of your exe
like c:\YourFolder\YourExe.exe

I want to change Myself..Can u help me? Smile | :)

Re: Running my application when Windows starts

Anonymous10-Apr-04 0:01

Anonymous

10-Apr-04 0:01

By placing my exe in the given path, its not activated when Windows starts up

Re: Running my application when Windows starts

Anonymous10-Apr-04 0:02

Anonymous

10-Apr-04 0:02

By placing my exe in the following path(HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run), the exe does not starts running automaticaly when Windows starts up

Re: Running my application when Windows starts

Renjith Ramachandran10-Apr-04 0:44

Renjith Ramachandran

10-Apr-04 0:44

please once more verify the path you given in registry.
that will work..

I want to change Myself..Can u help me? Smile | :)

Right Solution from right person only

ThatsAlok10-Apr-04 0:58

ThatsAlok

10-Apr-04 0:58

Helloo
i think every body told you the registry value but how implement is still i think any body told
so here it is->
CRegKey a;
a.Create(HKEY_LOCAL_MACHINE,"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run");
a.SetValue("you project path","your project name");
a.Close();
Got it i think Smile | :)

Alok Gupta
visit me at http://alok.stormpages.com

Re: Right Solution from right person only

toxcct10-Apr-04 1:20

toxcct

10-Apr-04 1:20

and where should we write such code ???

in the main ?

and what does that topic mean ? you 'think u'r god ???? WTF | :WTF:

TOXCCT >>> GEII power

Re: Right Solution from right person only

Renjith Ramachandran10-Apr-04 2:45

Renjith Ramachandran

10-Apr-04 2:45

his problem is not in creating the registry value,
it can be created by manually or by program, the PROBLEM is that didnt work in his computer..!!!!!!!! Sleepy | :zzz:

I want to change Myself..Can u help me? Smile | :)

PreProcessor defines

The Bowman9-Apr-04 10:40

The Bowman

9-Apr-04 10:40

Does anyone know of a way to discover all of the preprocessor defines that are set before and during the VC++ compilation of a module? I just want to know the results after plowing through a morass of headers. GNU CPP has such an output. Does VC++? Thanks.

Chas L.

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