Re: Sending a packet using PostMessage - C / C++ / MFC Discussion Boards

Burl D4-Jan-04 6:24

4-Jan-04 6:24

I have a class derived from CToolBar in a CFrame window. My problem is that I don't know how to tell if the user has closed the toolbar with the close button while it is floating. I have tried providing a OnClose message handler but it never gets called.
Any help would be greatly appreciated.
Thanks in advance.

Re: ToolBar close

PJ Arends4-Jan-04 10:55

PJ Arends

4-Jan-04 10:55

Maybe handle the WM_SYSCOMMAND message, looking for the SC_CLOSE command.

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!

GDI drawing in layers

mirano4-Jan-04 5:52

mirano

4-Jan-04 5:52

Hi guys.

I want to draw in layers, so if anybody could give me a hint about that, I would really appreciate it. I want to be able to draw in multiple layers, so for instance if I am to erase a rectangle or any other more complex object, I would only discard a layer and repaint that object as altered, not having to redraw the background or anything else. It is something like in Photoshop when you draw on the layer and you bring it to the front, then you can delete the whole layer at any moment later.

I only need a general guidance, not the actual code.

Re: GDI drawing in layers

PJ Arends4-Jan-04 9:30

PJ Arends

4-Jan-04 9:30

Keep the layers in a vector of transparent bitmaps. draw the bitmaps on top of each other using TransparentBlt().

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!

Sending a packet using PostMessage

__Cerb4-Jan-04 4:38

__Cerb

4-Jan-04 4:38

Let's say I have this piece of code...

CString strWndName = "My wnd";<br />
CString strClassName = "Wnd class";<br />
HWND hwnd = ::FindWindow(strClassName,strWndName);

Would it be possible to send a packet to hwnd using PostMessage?
If yes, which type of message should I send?

Thanks for help,

~Mike

Re: Sending a packet using PostMessage

Stefan Pedersen4-Jan-04 4:46

Stefan Pedersen

4-Jan-04 4:46

WM_COPYDATA[^] might fit your needs.

And if the paths that I have followed/have tread against the flow/there is no need for sorrow
I am coming home
Return, Crüxshadows

Re: Sending a packet using PostMessage

__Cerb4-Jan-04 5:33

__Cerb

4-Jan-04 5:33

Ok thanks.

Let's say I want to send the 0x68 packet.

COPYDATASTRUCT cds;
cds.lpData = NULL;
cds.cbData = 1;
cds.dwData = 0x68;

Would this work?

And what should I send as WParam? 0?

Thanks a lot for your help

~Mike

Re: Sending a packet using PostMessage

Gary R. Wheeler4-Jan-04 5:30

Gary R. Wheeler

4-Jan-04 5:30

I'm going to assume you are asking how you should use PostMessage to send a packet of information. "Which type of message" you should send depends on what you are trying to accomplish, which you haven't described. I'm also going to assume you are using MFC, and that you are trying to send a packet to a window created by your application.

If you are using PostMessage(), the message is placed on the window's message queue, and PostMessage() returns immediately. The window that receives the message may take some time before it processes the message. This means that the message will have to persist until the window gets around to looking at it. The easiest way to do this is to allocate your 'packet' on the heap, and deallocate it in the message handler. Here's an example:

#define MY_MESSAGE (WM_APP + 1)

class Packet {
public:
    Packet();
    ~Packet();
    // ... data members
    int m1;
};

...

// allocate a packet, set its contents

Packet *packet = new Packet;
packet->m1 = 123456;

// here's how you post a message

CString strWndName = "My wnd";
CString strClassName = "Wnd class";
HWND hwnd = ::FindWindow(strClassName,strWndName);

::PostMessage(hwnd,MY_MESSAGE,0,(LPARAM)packet);

This code sends your user-defined message MY_MESSAGE to the window with handle hwnd. Your handler for this message should be declared as follows:

afx_msg LRESULT OnMyMessage(WPARAM wParam,LPARAM lParam);

and it's implementation will look like the following:

BEGIN_MESSAGE_MAP( MyWindowClass, <window base class> )
...
ON_MESSAGE(MY_MESSAGE,OnMyMessage)
END_MESSAGE_MAP()
...

LRESULT MyWindowClass::OnMyMessage(WPARAM wParam,LPARAM lParam)
{
    Packet *packet = (Packet *)lParam;

    // ... use information in packet

    delete packet;

    return (LRESULT)0;
}

I hope this helps. If you are trying to send messages between applications, there are other methods of interprocess communication (named pipes, sockets, and so on) that are simpler.

Software Zen: delete this;

Re: Sending a packet using PostMessage

__Cerb4-Jan-04 5:45

__Cerb

4-Jan-04 5:45

Actually I am trying to send a packet to an online game.

That's why both your codes didn't work.

Thanks anyway, I hope you can help me

~Mike

Re: Sending a packet using PostMessage

User 66584-Jan-04 6:21

User 6658

4-Jan-04 6:21

packet to an online game? You need to send such packets to the query port of the game per UDP. What do you want to do exactly?

modified 12-Sep-18 21:01pm.

Re: Sending a packet using PostMessage

__Cerb4-Jan-04 6:33

__Cerb

4-Jan-04 6:33

I want to send the 0x68 packet to my game.

I believe the client receives packets from the game server on port 6112, if this can help.

Thanks,
~Mike

Re: Sending a packet using PostMessage

User 66584-Jan-04 6:50

User 6658

4-Jan-04 6:50

Yes, read my posting above. Sending packets to game (servers) has nothing to do with PostMessage() or SendMessage().

You need to use UDP (most games use UDP, don't know which ones use TCP).

Take a look at this article and its links section.

regards

modified 12-Sep-18 21:01pm.

Re: Sending a packet using PostMessage

Gary R. Wheeler4-Jan-04 6:53

Gary R. Wheeler

4-Jan-04 6:53

WHOA

.

PostMessage() is used to send Windows messages to windows, those funny things on the screen you interactive with.

The phrases 'online game', '0x68 packet', 'game server', and 'port 6112' tell me that you are trying to send a specific packet to an online game, and that the game communicates using TCP/IP sockets. That is a whole 'nother kettle of fish.

For introductory articles on socket programming under Windows, try here[^], here[^], and here[^].

You will also need to know the format of the packets used by the game to communicate.

Software Zen: delete this;

Re: Sending a packet using PostMessage

__Cerb4-Jan-04 11:06

__Cerb

4-Jan-04 11:06

So basically I have to create a UDP socket on my game server's ip and write my packet onto it... Am I right?

Thanks,
~Mike

Re: Sending a packet using PostMessage

Gary R. Wheeler5-Jan-04 15:32

Gary R. Wheeler

5-Jan-04 15:32

That's right. Like I mentioned in my earlier message, you'll need to know the format of the packet (how many bytes, what each byte means, and so on). Good luck.

Software Zen: delete this;

How to drag from control to Explorer

Anonymous4-Jan-04 3:47

Anonymous

4-Jan-04 3:47

I have a Internet Shortcut in a control that I want to drag onto Explorer. I have looked at Michael Dunn's article and it almost works but it wants to copy the file to Explorer. Of course it is not a file, it is just data and I want to drag this data to Explorer and create a shortcut based on the data. In other words I have a list control of internet shortcuts and I want to drag one or more to Explorer. How can I do this? Thank you Smile | :)

Remotely starting and stopping a service programmatically

luyaz4-Jan-04 3:05

luyaz

4-Jan-04 3:05

I want to write a mini app (GUI) to start and stop my service remotely. I want to connect to the remote computer using this mini app(GUI) and start or stop or even querry the status of a service. I use c but i welcome c++ code.
thankx!

Re: Remotely starting and stopping a service programmatically

valikac4-Jan-04 6:28

valikac

4-Jan-04 6:28

One solution is winsock.

Kuphryn

Re: Remotely starting and stopping a service programmatically

Renjith Ramachandran4-Jan-04 8:05

Renjith Ramachandran

4-Jan-04 8:05

you can use WMI APIs.
MSDN contains a lots of examples

The returned pointer may be temporary and should not be stored for later use.

Windows Copy to Clipboard problem

impeham4-Jan-04 2:30

impeham

4-Jan-04 2:30

i'm using the following:

HGLOBAL hmem;
LPTSTR local_buf;

hmem = GlobalAlloc(GMEM_MOVEABLE,500);
local_buf = (LPTSTR)GlobalLock(hmem);
lstrcpy(local_buf,"My Test");
GlobalUnlock(hmem);

if (OpenClipboard(NULL)) // i don't have a window
{
EmptyClipboard();
SetClipboardData(CF_TEXT,hmem);
}

////////////

When debugging, the OpenClipboard,EmptyClipboard worked fine, but SetClipboardData returns NULL.
After formatting the message, i got "Thread does not have a clipboard open."
i need to generally copy a CF_TEXT string to the clipboard.

I checked MSDN, but everything looks fine. What is the problem?

Thanks.

Re: Windows Copy to Clipboard problem

valikac4-Jan-04 6:32

valikac

4-Jan-04 6:32

One solution is COleDataSource.

HANDLE hmem = ::GlobalAlloc(GMEM_MOVEABLE, 500);
PTSTR local_buf = static_cast<ptstr>(::GlobalLock(hmem));
_tcscpy(local_buf, "2004");
::GlobalUnlock(local_buf);
COleDataSource *pODS = new COleDataSource;
pODS->CacheGlobalData(CF_TEXT, hmem);
pODS->SetClipboard();

Kuphryn

Re: Windows Copy to Clipboard problem

impeham8-Jan-04 0:39

impeham

8-Jan-04 0:39

i'm not using MFC. can you send an example without using it?

Thanks.

help my project, please

IT student4-Jan-04 1:27

IT student

4-Jan-04 1:27

I'm an IT student University of Bina Nusantara, Indonesia. I need you help with my program about editorial using extended key. Please... this project will help me raise my grade.
Editor program C

Tulis program yang berfungsi sebagai editor teks program C. Keluaran editor ini adalah program C (fle teks, ASCII). Editor ini harus memiliki kemampuan menyunting program sampai 1000 (seribu) baris dan 255 kolom.

1 2 3 4 5 6 7 8

12345678901234567890123457689012345768901234576890123457689012345768901234576890

1

2

3

4

5

..

..

..

21

22

23

24
File Edit About

NONAME Line 99 Col 99 Insert ON

1 2 3 4 5 6 7 8

12345678901234567890123457689012345768901234576890123457689012345768901234576890

1

2

3

4

5

..

..

..

19

2021

22

23

24
File Edit About

*************

* New *

* Open *

* Close *

* Save *

* Save As *

* Print *

* Exit *

*************

NONAME Line 99 Col 99 Insert ON

1 2 3 4 5 6 7 8

12345678901234567890123457689012345768901234576890123457689012345768901234576890

1

2

3

4

5

..

..

..

21

22

23

24
File Edit About

*************

* Copy *

* Paste *

* Find *

* Replace *

*************

NONAME Line 99 Col 99 Insert ON

1 2 3 4 5 6 7 8

12345678901234567890123457689012345768901234576890123457689012345768901234576890

1

2

3

4

5

..

..

..

21

22

23

24
File Edit About

*************

* Version *

* Author *

*************

NONAME Line 99 Col 99 Insert ON

1 2 3 4 5 6 7 8

12345678901234567890123457689012345768901234576890123457689012345768901234576890

1

2

3

4

5

..

..

..

20

21

22

23

24
File Edit About

*******************

* Binus C Editor *

* Version 1.0 *

* 2003 *

* © UBiNus *

*******************

NONAME Line 99 Col 99 Insert ON

1 2 3 4 5 6 7 8

12345678901234567890123457689012345768901234576890123457689012345768901234576890

1

2

3

4

5

..

..

..

19

2021

22

23

24
File Edit About

*********************************

* 0700999999 Ahmad Wicaksono *

* 0700999999 Bong Wei Chen *

* 0700999999 Chandra Simatupang *

* 0700999999 Deryl Liem *

* TI UBiNus, 1PAT, 2003 *

*********************************

NONAME Line 99 Col 99 Insert ON

Every time you choose NEW then the monitor automaticlly adds #include and void main() {}

1 2 3 4 5 6 7 8

12345678901234567890123457689012345768901234576890123457689012345768901234576890

1

2

3

4

5

6

7

..

19

2021

22

23

24
File Edit About

# include <stdio.h>

# include <conio.h>

void main() {

_

}

NONAME Line 5 Col 1 Insert ON

If you write For, the monitor automaticlly add (; ; ) { } become

for (; ; ) {

}

If you write While, the monitor automaticlly add () { } become

while ( ) {

}

If you write Do, the monitor automaticlly add { } while (); become

do {

} while ( );

If you write If, the monitor automaticlly add () { } else { } become

if ( ) {

} else {

}

If you write Switch, the monitor automaticlly add () { case: brek; } become

switch () {

case: break;

}

please help my project... I'm in a dead end.

student

Re: help my project, please

Prakash Nadar4-Jan-04 4:21

Prakash Nadar

4-Jan-04 4:21

IT student wrote:
NONAME Line 5 Col 1 Insert ON

seems like you screen dumped you code on to code project forum...Another guy with xmas gift.

Programming is an art not a skill, every one can be a skilled programmer but not an artist.

Bug in CMonthCalCtrl class ??

Qadddd4-Jan-04 0:55

Qadddd

4-Jan-04 0:55

Hello,

I was trying to create a dialog containing a calendar, so I decided to use the Month Calendar proposed by VC++ in the control bar.
But during the execution, when I click the calendar and display the selected day, I remarked that the day was wrong, 12 days more than the day I effectively clicked ...
I search in the MSDN CD to find an example and install the CmnCtrl1 project.
The MSDN project calendar reacts in the same way, 12 days more as soon as you click on another day that the current day.

Do I miss something in the use of this control ? Is it bugged ? If yes, is there a solution/workaround ? Can I use it with Win2K ?

Thanks in advance
DD

PS : I use Visual Studio 6.0 with Win2K

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