C / C++ / MFC Discussion Boards

Re: Counting characters from a text file

Big Art9-Apr-03 6:36

9-Apr-03 6:36

I really don't have the time to go through your code right now. But if it were my project I would simply put the contents of your text file in a CString variable and use the CString::GetLength() fn to get the character count and use the CString::Find(..) fn in a loop counting the spaces to get the word count.

Art

Removing directories

Brian Delahunty9-Apr-03 4:07

Brian Delahunty

9-Apr-03 4:07

Hey Lads

I'm using SHFileOperation to remove a directory.. code below. Not sure if I'm using it correctly. Just trying to completely remove a directory and all the contents.

SHFILEOPSTRUCT FileOp = {0};
FileOp.hwnd = m_hWnd;
FileOp.wFunc = FO_DELETE;
FileOp.pFrom = "d:\\test";
SHFileOperation(&FileOp);

It isn't working.. any ideas?
So.. Please save me from my own stupidity...

Regards,
Brian Dela Smile | :)

Re: Removing directories

Rickard Andersson²⁰9-Apr-03 5:26

Rickard Andersson²⁰

9-Apr-03 5:26

What error do you get?

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: Removing directories

Brian Delahunty9-Apr-03 5:31

Brian Delahunty

9-Apr-03 5:31

None.. Just doesn't work... as far as I know it should work.. At one stage I got a "Cannot read form the source file or disk". I haven't got that error since but it still doesn't work.

Regards,
Brian Dela Smile | :)

Html Edit Control Notification

Atlence9-Apr-03 3:50

Atlence

9-Apr-03 3:50

Hi!

Does anyone know the way to be notified when the content of a Html Edit Control (CHtmlEditCtrl) has been modified. I want this because I would prevent the user from changing some parts of the content (for example deleting a cell from a table, ...).

Thks in advance!
Appstmd
http://www.appstmd.com

Re: Html Edit Control Notification

Atlence19-Apr-03 8:25

Atlence

19-Apr-03 8:25

I know how to do this with a RichEdit control (use the SetEventMask member function).... But I don't know to do the same with an HtmlEdit control !!!!

Could anyone help me?

Thks in advance!
Appstmd
http://www.appstmd.com

MFC

frackasse9-Apr-03 2:30

frackasse

9-Apr-03 2:30

In an MFC application,

I use dialog window in which user give infotmations i store as variable member in the class of the dialog window.

How can I use this variable in an other window ( in the classView for exemple)
It seems that the #include "dialogs.h" is not sufficient

Re: MFC

Cedric Moonen9-Apr-03 2:41

Cedric Moonen

9-Apr-03 2:41

If it's a private member (I always use private variable members), you have to write a public function that returns the value:

For example if the variable is an int (says int Value) (place it in your header file):

public:<br />
int GetValue()  { return Value; }<br />
<br />
private:<br />
int Value;

You can then get your Value in the calling class by calling this function!

Hope this helps

winpcap handle problem

summo9-Apr-03 2:15

summo

9-Apr-03 2:15

In the code below packet_handler function is not the member of the
class I want to display the data generating from this function to be displayed on the list box. But handle to the list box is not there as is not the member of the class.
Is there any way I can get handle of listbox into the function p_h
below.
It is important the funtion declaration of "paket_handler" is defined in the library file so the return type or parameter cannot change.

//defined in winpcap library

void sniff::OnButton1() {
pcap_loop(adhandle, 0, packet_handler, NULL);//call to the call back //packet_handler function
}

void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data)
{
ih = (ip_header *) (pkt_data + 14); //length of ethernet header

ip_len = (ih->ver_ihl & 0xf) * 4;
......//more code
......
/* print ip addresses and udp ports */
printf("%d.%d.%d.%d -> %d.%d.%d.%d\n",
ih->saddr.byte1,ih->saddr.byte2,ih->saddr.byte3,ih->saddr.byte4,

ih->daddr.byte1,ih->daddr.byte2,ih->daddr.byte3,ih->daddr.byte4);

}

Reply me soon

CreateThread / ExitThread

Paul Farry9-Apr-03 2:03

Paul Farry

9-Apr-03 2:03

I've got some threads I've created ... mm nice Wink | ;-)

In the thread function should I ExitThread or should I just return?
If I ExitThread, what should I specify for the value if everything is fine?

hThread = CreateThread(
NULL, // no security attributes
0, // 0 = use default stack size
CopyFileFunction, // thread function
this, // argument to thread function
0, // use default creation flags
&dwThreadId); // returns the thread identifier

//
//.............
//

DWORD WINAPI CopyFileFunction(LPVOID lpParam)
{
ExitThread(1);

return 0;

)

Re: CreateThread / ExitThread

Zdeslav Vojkovic9-Apr-03 2:35

Zdeslav Vojkovic

9-Apr-03 2:35

you don't have to call ExitThread() explicitly, but if you use C-runtime functions inside the thread function, you should use _beginthreadex() instead of CreateThread() (otherwise some stack data for certain methods won't be initialized and you might have memory leaks)

Transfer of a SDI application to MDI

Claude Gagnon9-Apr-03 1:38

Claude Gagnon

9-Apr-03 1:38

Hi,

I utilize Visual C++ 6.0.

I have develop an application with menus and dialogs in SDI.

I want to transfert it to a MDI application.

There is a way to keep my dialogs and menus and transfer it to the MDI
project ?

Thanks,

Claude

Dao problem

naradaji9-Apr-03 1:27

naradaji

9-Apr-03 1:27

Hi all,

I'm creating a small application that uses DAO (I know, it's old-fashioned!).
I need to store in a field a text with more than 255 characters. So far I have used:

dbTable.CreateField("Error",dbText,255);

with success, but with the 255 limitation. I tried:

dbTable.CreateField("Error",dbMemo,2048);

but it's still 255-limited.

How can I create a field for a long text?

I'd appreciate any ideas.

Thanks a lot.

-- narada

Confused | :confused:

Re: Dao problem

G. Steudtel9-Apr-03 23:43

G. Steudtel

9-Apr-03 23:43

Hi,
first of all memo fields do have an initial length of zero.
Then check your UpdateData function, if there is a length restriction.
This can be done by explicitly setting the text length of the control or by DDV_MaxChar(....).

G. Steudtel

Re: Dao problem

naradaji9-Apr-03 23:58

naradaji

9-Apr-03 23:58

So you don't think this is an Access restriction?

type cast problem when going from VS6->VS.NET

Mathias S.9-Apr-03 0:43

Mathias S.

9-Apr-03 0:43

Visual Studio.NET refuse to compile this. get type cast error
in VS 6 it works.

CGridItem* CMyGridCtrl::GetNextItem( DWORD h )<br />
{<br />
	std::vector<CGridItem*>::iterator it;<br />
<br />
	// ERROR C2440<br />
	it = ( std::vector<CGridItem*>::iterator )h;<br />
	// Also tried <br />
	// it = static_cast< std::vector<CGridItem*>::iterator >( h);<br />
<br />
	it++;<br />
	if( isItemValid( it ) )<br />
		return (*it);<br />
	return NULL;<br />
}

Re: type cast problem when going from VS6->VS.NET

jhwurmbach9-Apr-03 1:13

jhwurmbach

9-Apr-03 1:13

Try
it = reinterpret_cast< std::vector::iterator >( h)
as the two types are totally unrelated.

[edit]Or did you try
it = static_cast< std::vector< whatever >::iterator >( h)
with whatever being the type of your vectors datatype.
[/edit]

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

Re: type cast problem when going from VS6->VS.NET

Mathias S.9-Apr-03 1:26

Mathias S.

9-Apr-03 1:26

reinterpret_cast didn't work..

The interator is casted to DWORD becouse some of the classes are also used in other projects and types is not known there.
Properly some bad design somewhere. But I don't want and have the time to rewrite tons of code.

This is just one of many type cast problem. But it looks like most of the problem are handles/DWORDs getting casted to interators.

Re: type cast problem when going from VS6->VS.NET

Mathias S.9-Apr-03 1:29

Mathias S.

9-Apr-03 1:29

yes
Cut and Paste Error..
it should say
it = static_cast< std::vector< CGridItem* >::iterator >( h)

nothing works. strange..

Re: type cast problem when going from VS6->VS.NET : Solved . maybe

Mathias S.9-Apr-03 1:53

Mathias S.

9-Apr-03 1:53

Problem has been solved. I think..

On VS6 I'm using SGi STL instead of the one included by MS in VS6..
But in VS.NET I was using the provided.

But when I changed so SGI STL is used in VS.NET those compile error went away
But I get some strange warnings instead on other stuff. But I think I can ignore them. Looks like the program is working now.

Blinking Object

SatyaDY9-Apr-03 0:31

SatyaDY

9-Apr-03 0:31

Hi,
In one of my project, I am plotting the line for some trajectory, in addition to this I want to show a blinking object at the beginning of the trajectory. I tried creating a bitmap (8 x 8) and tried to put it on the screen with BitBlt function in VC, but it's disturbing the line plotted. It should not distrub the plotted things, How to do it?? Can anybody give some idea or some code??
Regards
Satya

Re: Blinking Object

Roger Allen9-Apr-03 3:05

Roger Allen

9-Apr-03 3:05

Could you use an OS caret to do this? Use CreateCaret() and set the height/width of it and position at the start of your tradjectory.

May so what you need and then the OS can handle all the drawing stuff for you.

Roger Allen
Sonork 100.10016

Were you different as a kid? Did you ever say "Ooohhh, shiny red" even once? - Paul Watson 11-February-2003

Asynchronously inserting large number of items into TreeView

henchook8-Apr-03 23:44

henchook

8-Apr-03 23:44

I need to insert a very large number of items into a CTreeView derived control. This insertion takes a long time, so I am doing is asynchronously.

My problem is: whenever I call InsertItem, the tree selection jumps to the newly inserted item. I want to prevent this, so that my user sees the tree being built, but is able to select an item in the tree and have the selection remain on that item.

How would I go about doing this? I tried looking for and using different window styles, and I tried intercepting the TVN_SELCHANGED and TVN_SELCHANGING messages, but wasn't quite able to achieve anything...

I want it to behave sort of like IE does when you open a huge (and I mean HUGE, as in 1MB) XML file.... IE parses the file in the background, and keeps adding new nodes to it, but you are able to view whichever part of the document (that has already been loaded you want).

Thanks,
-CD

Re: Asynchronously inserting large number of items into TreeView

valikac9-Apr-03 11:35

valikac

9-Apr-03 11:35

One solution is to keep a reference of the current selected item. Upon inserting new items, call TreeView_Select().

Kuphryn

Re: Asynchronously inserting large number of items into TreeView

henchook9-Apr-03 20:29

henchook

9-Apr-03 20:29

The problem was that after inserting each item, there was a call to Expand(), which caused the treeview to scroll to the newly expanded icon. This did not have any visible effect when the tree was being populated off-screen, but once I started doing this in a separate thread after showing the treeview, it was apparent in the tree jumping all over the place.

It turns out (this is code I inherited from someone else at my company) that the proper thing to do, instead of calling Expand() after inserting each item, is to set the State bits (and the mask bits) in the TVINSERTSTRUCT before inserting the item, this causes it to be expanded when it is inserted, without the tree scrolling to it.

Thanks anyway for your help.

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