C / C++ / MFC

Re: Retrieving image from Clipboard

11-Apr-04 10:31

How can I retrieving a image format ie CF_BITMAP from Clipboard in VC++ and write it to bmp of jpeg file

Jack

Anonymous11-Apr-04 10:32

Re: Retrieving image from Clipboard

11-Apr-04 10:32

How can I retrieving a image format ie CF_BITMAP from Clipboard in VC++ and write it to bmp or jpeg file

Jack

Ravi Bhavnani11-Apr-04 11:33

Iphlpapi and Divide by Zero Exception

11-Apr-04 11:33

Perhaps this article[^] will help.

/ravi

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User 1278211-Apr-04 9:40

User 12782

11-Apr-04 9:40

I have the following code in a preferences dialog in an MFC app, which isn't always called, and looks like this:

PIP_ADAPTER_INFO    pAdapterInfo;
PIP_ADAPTER_INFO    pAdapter        =NULL;
DWORD               dwReturn        =0;

pAdapterInfo=(IP_ADAPTER_INFO*)malloc(sizeof(IP_ADAPTER_INFO));
ULONG ulOutLen=sizeof(IP_ADAPTER_INFO);

if(GetAdaptersInfo(pAdapterInfo,&ulOutLen)==ERROR_BUFFER_OVERFLOW)
{
    GlobalFree(pAdapterInfo);
    pAdapterInfo=(IP_ADAPTER_INFO*)malloc(sizeof(ulOutLen));
}

if((dwReturn=GetAdaptersInfo(pAdapterInfo,&ulOutLen))==NO_ERROR)
{
    pAdapter=pAdapterInfo;
    while(pAdapter)
    {
        //do something with pAdapter

        pAdapter=pAdapter->Next;
    }
}

The first time I run the executable after compile, I get this error:

The exception Integer division by zero.
(0xc0000094) occurred in the application at location 0x0040124d

Everything after that I run the same executable, the program runs fine, and the code in question works fine. But when I close the app, I get this error about three times:

The instruction at "0xSOMEADDRESs" referenced memory at "0x00000000".  The memory could not be "read".

I've tried commenting out various bits of the code to see which line causes the problem, but I can't find anything consist.

Any idea what's wrong or what I could do?

Thanks,
Aaron Stubbendieck

modified 12-Jul-20 21:01pm.

Re: Iphlpapi and Divide by Zero Exception

Antti Keskinen11-Apr-04 11:36

Antti Keskinen

11-Apr-04 11:36

Are you using a property page dialog for the preferences ? If so, one of the exceptions is explained by that: when a property page is loaded by a property sheet object, an exception is raised. This functionality is discussed in the property sheet class.

Next, have you tried stepping though the code ? What point is it exactly that causes the exception "Division by zero" ?

-Antti Keskinen

----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.

Re: Iphlpapi and Divide by Zero Exception

User 1278213-Apr-04 11:11

User 12782

13-Apr-04 11:11

Currently I'm just using a CDialog derived class with some controls on it, though I may switch to property pages in the future.

I ran it through the debugger, and when I go to my options dialog (which requires me to hit alt after selecting it from the menu for some reason) and click the button (for testing purposes) that calls that piece of code, it works perfectly with no errors or anything. When I exit the application, I don't get any popup access violations, but there are some listed in the debug output window, and they're all in kernel32.dll and at the same memory address.

I have no idea what to do. Suggestions?

Thanks,
Aaron Stubbendieck

modified 12-Jul-20 21:01pm.

clistctrl row hilight

r00k1311-Apr-04 9:25

r00k13

11-Apr-04 9:25

im doing a find dialog, here's my code
void CWordFind::OnButtonFindNow()
{
// TODO: Add your control notification handler code here
// update from screen to var
UpdateData(TRUE);
LVFINDINFO info;
int nIndex;

info.flags = LVFI_STRING;
info.psz = m_sFindWord;

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

how can i highlight the row in CListCtrl?
the only thing that comes close as a member function is SetSelecteionMark, but it's not used for highlighting, i supposed..

thanks for your help

Anonymous11-Apr-04 12:11

11-Apr-04 12:11

you need to take own draw over list control and set different background (font, frame, whatever) for item you like to highlite.

Yours, Katerina

r00k1311-Apr-04 12:53

r00k13

11-Apr-04 12:53

any sample code for that? sorry im new at this

Anonymous11-Apr-04 15:29

11-Apr-04 15:29

i think it is in MSDN or somewhere here, try to search

r00k1311-Apr-04 17:37

r00k13

11-Apr-04 17:37

thanks, found a great one here..thanks again

Simple mathematical equations and graphs

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

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

Ravi Bhavnani11-Apr-04 6:23

11-Apr-04 6:23

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

/ravi

My new year's resolution: 2048 x 1536
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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.

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

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

11-Apr-04 6:25

SetMenu (NULL);

/ravi

My new year's resolution: 2048 x 1536
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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