C / C++ / MFC Discussion Boards

Re: clistctrl row hilight

r00k1311-Apr-04 17:37

r00k13

11-Apr-04 17:37

thanks, found a great one here..thanks again

Re: clistctrl row hilight

Chris Richardson11-Apr-04 19:48

Chris Richardson

11-Apr-04 19:48

If you want to select the item like you would do with the mouse, but you want to do it programmatically, this should do it:

if ((nIndex = m_pParent->m_ListCtrl.FindItem(&info)) == -1)
{
   MessageBox("Word was not found.", "Find");
}
else
{
   // highlight row nIndex
   m_ListCtrl.SetItemState( nIndex, LVIS_SELECTED, LVIS_SELECTED );
   m_ListCtrl.SetSelectionMark( nIndex );
}

Good luck,

Chris Richardson

Security issue

tank102511-Apr-04 6:55

tank1025

11-Apr-04 6:55

hi,i'm studying Security issue,and i add the code in my prog:

#include "accctrl.h"
#include "aclapi.h"

...........................
CSecurityDescriptor sd;
sd.InitializeFromThreadToken();
hr = CoInitializeSecurity(sd, -1, NULL, NULL,
RPC_C_AUTHN_LEVEL_PKT, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE, NULL);
_ASSERTE(SUCCEEDED(hr));

but the prog compiled show:
C:\CommuServ.0411(wnd.err)\CommuServ.cpp(83) : error C2065: 'CSecurityDescriptor' : undeclared identifier
what is wrong?
appreciate any help!!

Re: Security issue

toxcct11-Apr-04 22:08

toxcct

11-Apr-04 22:08

did you added the correct header corresponding to your CSecurityDescriptor (like SecurityDescriptor.h) ?

TOXCCT >>> GEII power

Simple mathematical equations and graphs

shanhotmale11-Apr-04 5:58

shanhotmale

11-Apr-04 5:58

Hi,

I'm looking for some code that understands mathematical expressions presented as a string (e.g. "y=sin(x)+2x").

Have you seen any code that does this? This code seems so fundamental to me, it could even be provided within MFC but I can't find it.

I'm writing an MFC application that will plot a x-y graph of a mathematical equation.

So ideally code I am looking for will accept a string input (e.g. "y=x^2+5") and an x value will output the corresponding y value.

Thank you
Shan

Re: Simple mathematical equations and graphs

Ravi Bhavnani11-Apr-04 6:23

Ravi Bhavnani

11-Apr-04 6:23

This[^] (C#) article may provide a starting point.

/ravi

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Re: Simple mathematical equations and graphs

calius11-Apr-04 6:29

calius

11-Apr-04 6:29

For your application you need to first "compile" the expression into some quickly-evaluatble form, and then repeatedly assign values to the variables in it (in your case -- 'x' only) and get the result.

I did that a long long time with UCalc, which back then had a .lib version.

Alternatively, if you're feeling up to it, you can write an infix parser, and create an expression tree or a postfix expression from it.

EFG also has a page full of links for such programs and libraries. Search for "+Expression +Evaluate +Library +EFG" on Google.

I'll be glad to elaborate more if you need.

Re: Simple mathematical equations and graphs

toxcct11-Apr-04 22:06

toxcct

11-Apr-04 22:06

have a look at the book The C++ Language from Bjarne stroustrup. Inside, he gives an example of "mathematic calculator" (about p.120).

TOXCCT >>> GEII power

Re: Simple mathematical equations and graphs

John R. Shaw11-Apr-04 23:45

John R. Shaw

11-Apr-04 23:45

No code actualy understands a mathematical expression! What I think you are looking for is a "Recursive Descent Parser"; the best example I ever found was in "Advanced C Programming" (may be out of print), it is much easier to understand than the one in "Bjarne stroustrup" book.

INTP

Hiding my menu bar

yanuart11-Apr-04 5:57

yanuart

11-Apr-04 5:57

I want to hide my menu bar but I've read in msdn that a menu bar is always visible, but I think I've seen an application (running fullscreen, probably with WS_POPUP) has the ability to hide/unhide its menu bar.
Can we really do this using MFC ??

Re: Hiding my menu bar

Ravi Bhavnani11-Apr-04 6:25

Ravi Bhavnani

11-Apr-04 6:25

SetMenu (NULL);

/ravi

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CList class

packetlos11-Apr-04 5:01

packetlos

11-Apr-04 5:01

Hi,

What is the best way of using MFC's List to store data of this type?

typedef struct DATAGRAM
{
	UINT packetID;			// Sequence Number
	ip_header* ipHeader;		// IP header
	pcap_pkthdr* wpHeader;		// Winpcap header
	const UCHAR* pkt_data;		// Packet data
} DATAGRAM;

ipHeader* etc are pointers to further structs. I tried plain CList DATAGRAM, DATAGRAM& and are having problems with code like:

packetCapture.AddTail(filledStruct);

The addtail is in a fairly fast loop and added data is going in fine and coming out of the list corrupted (due to something going out of scope before the operation is completed perhaps?)

I am probably doing something extremely retarded, any ideas?

Re: CList class

Ravi Bhavnani11-Apr-04 6:29

Ravi Bhavnani

11-Apr-04 6:29

Did you mean to do this instead?

packetCapture.AddTail (&filledStruct);

Also remember that filledStruct must be in scope for its address to be valid when you access the list after populating it. You might want to consider new()ing instances of DATAGRAM and adding those instances to the list. They will be around as long as your application runs since they're created on the heap. Be sure to free up this memory before your app exits.

/ravi

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Gantt Chart Algorithm

ayman_fci11-Apr-04 4:42

ayman_fci

11-Apr-04 4:42

Hi all,
I would be pleased if any one have an algorithm for building a software program to make a Gantt Chart i need to know the steps thanx all .

More Creativity

Re: Gantt Chart Algorithm

cmk12-Apr-04 11:59

cmk

12-Apr-04 11:59

I'm writting my own Gantt control right now as i wasn't able to find anything suitable out on the web.

When i searched for existing Gantt related work the best (only) thing i found was :
http://ganttproject.sourceforge.net[^]
although this is all in Java it might provide a starting point.

I have tended to use MS Project as a guide to what kind of data needs to be stored and how to present the data in an interface. If you are going to have access to MS Project you may want to look at the database schema information provided with MSP. It can usually be found in the install directory e.g. C:\Program Files\Microsoft Office\Office\1033 and will be named OLE_DB.HTM, or PROJDB.HTM, or something similar depending on the version of MSP you have installed.

...cmk

Save the whales - collect the whole set

runtime error . please help

mloolm11-Apr-04 4:17

mloolm

11-Apr-04 4:17

hi,
I am trying to understand the Plot Grafhical Library (great library that plots grafhs that i downloaded from the PGL homepage and not the one you can download on the code project site) by programming a small example. but after i run the appliaction i find myself facing the next message : "Unhandled exception in try2.exe (MFCO42D.DLL): 0x0000005: Access Violation"
this violation occures while the program tries to call for a constructor of one of the PGL classes (CPGLRegion), and the debugger brings me to GetThreaterMode() function (from viewhtml.cpp).
if someone knows what is the problem, please help.

mloolm

what is "Default IME"

tank102511-Apr-04 2:19

tank1025

11-Apr-04 2:19

hi,all:
when i use spy to trace my windows prog,the trace show that there is a window which the caption is "Default IME".
who can tell me:what is the "Default IME"?
another question:who can tell me the "winsta0" in function OpenWindowStation("winsta0",......)?

appreciate any help!!!!

Rich text Control - HOW to set that user cannot copy text?

GirlsCanProgram11-Apr-04 2:17

GirlsCanProgram

11-Apr-04 2:17

Hello all,

please, does anybody know how to setup the RichTextControl (2.0) that it will appear only as the text on dialog box and not as edit field (e.g. that cursor changes and user can select it)?
I tried to set it as read only, but it doesn't help.

Thank to you all!
Katerina

Re: Rich text Control - HOW to set that user cannot copy text?

Renjith Ramachandran11-Apr-04 5:34

Renjith Ramachandran

11-Apr-04 5:34

i am not sure..just try
YourCtrlVariable.EnableWindow(FALSE);

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

Re: Rich text Control - HOW to set that user cannot copy text?

Anonymous11-Apr-04 6:58

Anonymous

11-Apr-04 6:58

Hi,
it is not realy nice solution because i have to use different font (normal is grayed then), but still better than nothink,
maybe somebody knows better solution?
Anyway thanks!

how can i help you to change your self?

Re: Rich text Control - HOW to set that user cannot copy text?

Ravi Bhavnani11-Apr-04 11:32

Ravi Bhavnani

11-Apr-04 11:32

GirlsCanProgram wrote:
I tried to set it as read only, but it doesn't help.

Strange. This should work.

// Make rich edit control read-only
VERIFY (myRichEditCtrl.SetReadOnly (TRUE));
ASSERT (myRichEditCtrl.GetStyle() & ES_READONLY);

/ravi

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Re: Rich text Control - HOW to set that user cannot copy text?

Anonynmous11-Apr-04 12:02

Anonynmous

11-Apr-04 12:02

Hi dear,
yes, sure setting it to read only works,
but then when you will move over control the cursor changes and and you can also select the text.
So it doesn't look like normal text.
Katerina

Re: Rich text Control - HOW to set that user cannot copy text?

gUrM33T11-Apr-04 15:40

gUrM33T

11-Apr-04 15:40

Hi Katerina, what you are doing is right according to me. But, there is one more thing that you need to add. Override the PreTranslateMessage and enter the code given below:

BOOL CMyDialog::PreTranslateMessage(MSG *pMsg)
{
  // don't allow user to select the text in the control
  if (pMsg->message == WM_MOUSEMOVE && pMsg->wParam == MK_LBUTTON)
    return (TRUE);

  return (CMyDialog::PreTranslateMessage(pMsg));
}

Don't remove the read-only setting.

Hope this proves useful.

Gurmeet S. Kochar

If you believe in God, it's because of the Devil

My CodeProject Articles: HTML Reader C++ Class Library, Numeric Edit Control

VC program compiled on XP Home does not run on XP Pro?!?!

Tony Westminster11-Apr-04 0:52

Tony Westminster

11-Apr-04 0:52

Hello,

I am experiencing a very strange "phenomenon":

When I compile a Visual C++ program in VS 2002
(no GUI, just console output) into
an exe on XP Home it runs smoothly. However,
when I give this to someone with an XP Pro
machine, it does not run but stops with an
exception error message box.
We have tested this on 3 different XPPro boxes now
and everywhere the same result.

When I compile the program with the same VS 2002
installed on a XPPro machine into an exe,
it runs BOTH on XPPro and XPHome.

I am really puzzled and have no clue why this happens.
Seems that in terms of OS at compilation time the exe's
are downward compatible but not upward.

Could anybody please help me and tell me what is going on?

Thank you so much in advance,
Tony

Re: VC program compiled on XP Home does not run on XP Pro?!?!

Michael P Butler11-Apr-04 1:05

Michael P Butler

11-Apr-04 1:05

Tony Westminster wrote:
Could anybody please help me and tell me what is going on?

A lot depends on what the exception error is. Is this an MFC app or a pure Win32 app. Do you use the CommonControls dlls.

Michael

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That you can get what you want or you can just get old,
Your're going to kick off before you even get halfway through.
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