Re: Handling of window opening - C / C++ / MFC Discussion Boards

Johan Rosengren18-Jun-04 4:37

18-Jun-04 4:37

I'm doing stuff like this in http://www.codeproject.com/miscctrl/diagrameditor.asp[^] where I find the performance quite ok. I'm updating all of the screen, but I do use double buffering. So, this might be a solution for you - create a memory CDC, draw all objects to it, and blit the whole mess to the screen in a single BitBlt.

Re: How to refresh a particular region

John R. Shaw18-Jun-04 9:32

John R. Shaw

18-Jun-04 9:32

OnEraseBkgnd():
return TRUE; // do all drawing in OnDraw()

OnLButtonDown():
pointAnchor = point;
rectCurrent.Set(point.x,point.y,point.x+1,point.y+1);
InvalidateRect(rectCurrent);

OnMouseMove():
rectNew.Set(pointAnchor.x,pointAnchor.y,point.x,poin.y);
rectNew.NormalizeRect();
rectNew.bottom++;
rectNew.right++;
rectCurrent.UnionRect(rectCurrent,rectNew);
InvalidateRect(rectCurrent);
rectCurrent = rectNew;

OnDraw():
Normaly in the above you would have been drawing to a bitmap via a memory DC.
BitBlt(...);
ExcludeClipRect(bitmapRect); // area where you blited the bitmap
CRect rcClip;
pDC->GetClipBox(&rcClip);
pDC->FillSolidRect( // fill in background
rcClip.left,rcClip.top,rcClip.Width(),rcClip.Height(),
::GetSysColor(COLOR_WINDOW));

With that said check out the article CExBitmap, it was designed to be used in a paint program.

Good luck!

INTP

Urgent Named Pipe issue

A T I F18-Jun-04 1:48

A T I F

18-Jun-04 1:48

I am trying to use named pipe to transfer data between two process. I have called the following code

<br />
	HANDLE hPipe; <br />
	LPTSTR lpszPipename = "\\\\.\\pipe\\DataTransferPipe"; <br />
<br />
    hPipe = CreateNamedPipe( <br />
		lpszPipename,             // pipe name <br />
		PIPE_ACCESS_DUPLEX,       // read/write access <br />
		PIPE_TYPE_MESSAGE |       // message type pipe <br />
		PIPE_READMODE_MESSAGE |   // message-read mode <br />
		PIPE_WAIT,                // blocking mode <br />
		PIPE_UNLIMITED_INSTANCES, // max. instances  <br />
		1024,                  // output buffer size <br />
		1024,                  // input buffer size <br />
		18000,             // client time-out <br />
		NULL);                    // no security attribute <br />
	<br />
	if (hPipe == INVALID_HANDLE_VALUE) <br />
	{<br />
		MessageBox("Error creating named pipe", "Named Pipe Error"	, MB_OK);<br />
		return;<br />
	}<br />
	<br />
	bool bConnected = ConnectNamedPipe(hPipe, NULL) ? TRUE : (GetLastError() == ERROR_PIPE_CONNECTED); <br />

I want the system to be that if no client connect for say 3 sec the call ConnectNamedPipe should return false. Is this possible....how. In the above code it just locks on the ConnectNamedPipe call

Re: Urgent Named Pipe issue

vcplusplus18-Jun-04 3:35

vcplusplus

18-Jun-04 3:35

BOOL SetNamedPipeHandleState(
  HANDLE hNamedPipe,             // handle to named pipe
  LPDWORD lpMode,                // pointer to new pipe mode
  LPDWORD lpMaxCollectionCount,  // pointer to maximum collection count
  LPDWORD lpCollectDataTimeout   // pointer to time-out value
);

Removing Non-Client area of a window

alexei_p18-Jun-04 1:36

alexei_p

18-Jun-04 1:36

How can I remove non-client area of a window (border & title), which belongs to another process (separate application)? I have only HWND of that window, and cutting its DC using SetLayeredWindowAttributes() with LWA_COLORKEY, to get some specific shape, but all non-client area remains as an ugly frame. So I need to remove it somehow.
Note: the window is created by existing application, and I can’t change its code

Re: Removing Non-Client area of a window

Ravi Bhavnani18-Jun-04 2:43

Ravi Bhavnani

18-Jun-04 2:43

You might want to try hooking the window and handling WM_NCPAINT.

/ravi

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Handling of window opening

alexei_p18-Jun-04 1:33

alexei_p

18-Jun-04 1:33

1) How to handle opening of a window, which belongs to another process (separate application)? The window has unique title, but not unique class. I need more intelligent way, than just calling FindWindow() from infinite loop

2) How can I monitor and handle closing/terminating of that window, after I found it?

Re: Handling of window opening

Rodrigo Pinto Pereira de Souza18-Jun-04 1:48

Rodrigo Pinto Pereira de Souza

18-Jun-04 1:48

Hook mechanism.
I don't know properly how to program to detect window open, but I know that is the most efficently way to detect.
Look in codeproject for hook. I think that you will have success ...

regards Cool | :cool:

Rodrigo Pinho Pereira de Souza

free pointer problem

mufasa218-Jun-04 1:00

mufasa2

18-Jun-04 1:00

I have the following code:

typedef double* configPt;
configPt* configurations;
configurations = (configPt*)malloc(sizeof(configPt));

for(int i=0;i < max;i++)
{
configurations[i][0]=/*whatever*/
configurations[i][1]=/*whatever*/
}
/*Operations with the aid of configurations*/
free (configurations);

Well, when the program arrives to the free function, it crashes and i dont know why.

Re: free pointer problem

jmkhael18-Jun-04 1:15

jmkhael

18-Jun-04 1:15

double** configurations;
configurations = (double**)malloc(sizeof(double*));
Here you are allocating a pointer to a pointer to double

for(int i=0;i < max;i++)
{
configurations[i][0]=/*whatever*/
configurations[i][1]=/*whatever*/
}
Here you are writing to a non allocated memory.

I would go for:

double **ppdDoubleMatrix = (double **) calloc(iRows, sizeof(double *));
if(ppdDoubleMatrix)
{
for (iRowsCounter = 0; iRowsCounter < iRows; iRowsCounter++)
{
ppdDoubleMatrix[iRowsCounter] = (double *) calloc(iColumns, sizeof(double));
}
}

Freeing it like so:

for (iRowsCounter = 0; iRowsCounter < pxThis->iRows; iRowsCounter++)
{
if (ppdDoubleMatrix[iRowsCounter])
{
free(ppdDoubleMatrix[iRowsCounter]);
ppdDoubleMatrix[iRowsCounter] = NULL;
}
}

// Free the pointer
free(ppdDoubleMatrix);
ppdDoubleMatrix = NULL;

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: free pointer problem

Rodrigo Pinto Pereira de Souza18-Jun-04 1:54

Rodrigo Pinto Pereira de Souza

18-Jun-04 1:54

for(int i=0;i < max;i++)
{
free(configurations[i][0]);
free(configurations[i][1]);
}

Enjoy it Cool | :cool:

Rodrigo Pinho Pereira de Souza

Using VC++6 .dll and .lib in VC.NET

Freddie Code18-Jun-04 0:58

Freddie Code

18-Jun-04 0:58

I'm trying to use a .dll and .lib that was created in VC++6 with a new VC.NET project. I add the .dll and .lib to the linker options and #include the cooresponding .h file to the project. I can't get the program to recongnize the function in the .dll and .lib correctly. It seems that .NET does not like the way the functions in the .h file are declared, or something?

Is there something new in VC.NET that I need to know with regards to using .lib and .dll?

Help! Thanks...

Using dll...

uniqueworld18-Jun-04 0:40

uniqueworld

18-Jun-04 0:40

I have a dll port.dll .I don't know how to use them in VC++.
I use dumpbin tool but I can't use them. Help me doing this.
Please tell me in detail.

Re: Using dll...

irshad_bukhari18-Jun-04 3:45

irshad_bukhari

18-Jun-04 3:45

Hi,

Below link has a very useful tutorial related to
DLL implementation in VC++ 6.

http://www.codeproject.org/dll/XDllPt1.asp

Hope it will be useful to you.

Best Regards,
Irshad

general question about network traffic detection

SireNexus17-Jun-04 23:27

SireNexus

17-Jun-04 23:27

Hello,

i want to develop a tool for winXP that dynamically
limits Intenet (IP) bandwith on a LAN host (LAN connected to Internet via router).
the tool should run on all LAN clients and send
information about the current IP traffic on the client to the other clients. with this information it should limit the bandwith to a predefined value, if the other clients need full bandwith, too.
for example: if three clients need full bandwith all
get limited to 1/3 of the full bandwith available.
if just one client need full bandwith it should get all.

thats the theory.

to manage this, i need to detect the current ip traffic on a client.
searching the web brought me to MS IpHlpApi.lib
but it only detects IP datagram amounts, not the real size if an ip-packet.

next solution is ip-packet sniffing, but this need
as far as i now, developing a kernel mode driver.

i know about pcap library for packet sniffing task
but it doesnt allow packet manipulation.
i dont need packet manipulation for my task, but
ive got another project in mind that does, so i want to go the straight (maybe hard) way.

i thought about using MS Visual C++ with MFC and DDK

so my question:
what would you suggest for solving my problem?

best regards
Robert

Re: general question about network traffic detection

Trollslayer18-Jun-04 1:34

Trollslayer

18-Jun-04 1:34

This sounds like any firewall code would do that. Maybe there is somethnig on Sourceforge ?

Elaine Rose | [Rose]

The tigress is here Big Grin | :-D

Re: general question about network traffic detection

Antony M Kancidrowski18-Jun-04 4:12

Antony M Kancidrowski

18-Jun-04 4:12

Have a scout about for "Packet Shapers". You may find some useful articles.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fuity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)

Check for existing directory

Cedric Moonen17-Jun-04 23:22

Cedric Moonen

17-Jun-04 23:22

Hello !

I need to check if a specified directory exists. If not, I must create it (a complete path is specified).
How is the best way to do that ?

Thanks

Re: Check for existing directory

Arjan Schouten17-Jun-04 23:38

Arjan Schouten

17-Jun-04 23:38

I think this will work

CFile f;
CFileStatus fs;

if(f.GetStatus(lpszDirectoryPath, fs) == FALSE)
   MakeSureDirectoryPathExists(lpszDirectoryPath);

Arjan

Re: Check for existing directory

Cedric Moonen17-Jun-04 23:48

Cedric Moonen

17-Jun-04 23:48

Hi !
Thanks, that worked Wink | ;-)

Re: Check for existing directory

James R. Twine18-Jun-04 11:47

James R. Twine

18-Jun-04 11:47

   Why not just call CreateDirectory(...) and be done with it? If the directory does not exist, it will be created and if it does exist, you will get back an ERROR_EXISTS error code. Either way, you get want you want and will likely be faster than doing you own check(s) first.

   But the Shell LWAPI function PathFileExists(...) was designed for checking for the existance of files/directories...

   Peace!

-=- James
Tip for SUV winter driving survival: "Professional Driver on Closed Course" does not mean "your Dumb Ass on a Public Road"!
Articles -- Products: Delete FXP Files & Check Favorites

Rugular Expression State Diagram

John R. Shaw17-Jun-04 22:06

John R. Shaw

17-Jun-04 22:06

What I am looking for is a state machine diagram showing how to decipher a regular expression. I've searched the www and have half a dozen pieces of source code that process regular expressions, plus I've read more articles on NFA's and DFA's than I care to think about. None of them give me what I am looking for. I am working on developing my own diagram, but it is far more complicated than it appears on the surface. I've written DFA's to handle kown cases (keywords,numbers,etc..), but what I want is to allow the user to enter in a regular express that my code can use to generate a (specific) DFA in memory.

INTP

raw Ethernet packet using NDIS

poirouge17-Jun-04 22:05

poirouge

17-Jun-04 22:05

Hello,

I am using Borland C++ 6,
I need to read and send RAW Ethernet packet,

From few weeks I am trying to use winpcap, TjesComponenet and more programms to read and send Ethernet Data on the network. Any of these is working good !!! snif

Can any one tell me how to developp a raw ethernet packet using NDIS ???
I found a exemple of NDIS on C#, but none on C++.

Can anyone help me please ???

Re: raw Ethernet packet using NDIS

Antony M Kancidrowski18-Jun-04 4:16

Antony M Kancidrowski

18-Jun-04 4:16

What are your problems with using an existing NDIS driver i.e. winpcap?

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fuity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)

Re: raw Ethernet packet using NDIS

poirouge20-Jun-04 22:47

poirouge

20-Jun-04 22:47

I don't know how to use NDIS!!!
I can't find a single soucre code in C++ only using NDIS.

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