C / C++ / MFC Discussion Boards

Anonymous22-Dec-03 21:56

22-Dec-03 21:56

Do anyone know how to link a Visual C++ program to a interface which is created by Visual basic 6?

i use visual C++ to create a random letter, then i need it to be able to output in my visual basic 6's interface..

Re: Visual C++ link with Visual basic 6?

jhwurmbach22-Dec-03 22:43

jhwurmbach

22-Dec-03 22:43

You could always man that massive gun named COM and aim it at your problem...

Who is 'General Failure'? And why is he reading my harddisk?!?

Re: Visual C++ link with Visual basic 6?

Anthony_Yio23-Dec-03 1:09

Anthony_Yio

23-Dec-03 1:09

Write your VC app as dynamic link library (DLL)
and export the function u want.

Sonork 100.41263:Anthony_Yio

Please help on how to update my Platform SDK!

twing22-Dec-03 21:32

twing

22-Dec-03 21:32

when i compiled some program,
the output in debug show :
"You are not using the latest Platform SDK header/library "
"files. This may prevent the project from building correctly."

failed to compile it.

and the origin code is:

#ifndef WT_EXECUTEINPERSISTENTIOTHREAD
#pragma message("You are not using the latest Platform SDK header/library ")
#pragma message("files. This may prevent the project from buildingcorrectly.")
#endif

could u tell me how to solve my problem and explain what it's in?
Thank u!

Hello World!

Re: Please help on how to update my Platform SDK!

Michael P Butler23-Dec-03 1:01

Michael P Butler

23-Dec-03 1:01

http://www.microsoft.com/msdownload/platformsdk/sdkupdate/[^]

Michael

Snow is lying on the ground, and in the air the sleigh bells sound,
The frosted patterned window panes, it's British summer time again.
No, it's not, It's Christmas - Santa Claus in on the Dole (Spitting Image 1986)

Retreive the conent MFC Active Document Server

Member 52603722-Dec-03 19:33

Member 526037

22-Dec-03 19:33

How can I retrieve the content of MFC Active Document Server?

I create my own editor using rich textbox. The editor is also an Activex container.
I can insert one Active Document Server in the rtf documnet. After saving the file as rtf format. I can not retrieve the content of rtf file for conversion to other format.

Can any one help on this regard..
Thanks in advance.

Retreive the conent MFC Active Document Server

Member 52603722-Dec-03 19:09

Member 526037

22-Dec-03 19:09

DllExport Function crashing

Kishor Morkhandikar22-Dec-03 18:54

Kishor Morkhandikar

22-Dec-03 18:54

I am exporting a function something like show below:
extern "C" DllExport const char* ActivatePlot(CString szPlot);

When I call this function from another DLL or module, the application crashes while returning from the function "ActivatePlot".
From the call-stack I found that the control is in the destructor of CString object and is trying to free the memory using FreeStore().

Can you explain whether we can use CString object in a DllExport functions? And if not, why?

Re: DllExport Function crashing

Roger Allen23-Dec-03 2:45

Roger Allen

23-Dec-03 2:45

CString uses dynamic memory allocation to store its strings. When you pass a CString object about, if it needs to re-allocate at any point, it will make use of the current heap manager to allocate the memory. If your doing this in MFC with the MFC library as a shared DLL, you should only have the one heap manager. If your not, then you will find that you are trying to de-allocate an allocation from one heap manager with an allocation from the other - which is probably the problem here. In such cases as this, can you not just pass in the szPlot as a const char * pointer? You need to avoid passing about objects that will do this.

Roger Allen - Sonork 100.10016
If your dead and reading this, then you have no life!

DDV functions

Dinesh Ahuja22-Dec-03 17:38

Dinesh Ahuja

22-Dec-03 17:38

Hi Everybody,
I have a class which is being derived from CDialog class.
class CEventDialog : public CDialog {
private:
CString m_sEventDesc;
int m_iHours;
int m_iMin;
// Other implementation has been removed from the class.
};

The deifination for DoDataExchange is as follows:

void CEventDialog::DoDataExchange(CDataExchange* pDX) {

CDialog::DoDataExchange(pDX);
DDX_Text(pDX,IDC_ADDSTRHR,this->m_iHours);
DDV_MinMaxInt(pDX,this->m_iHours,1,24);
DDX_Text(pDX,IDC_EDITDESC,this->m_sEventDesc);
DDV_MaxChars(pDX,this->m_sEventDesc,20);
DDX_Text(pDX,IDC_ADDSTRMIN,this->m_iMin);
DDV_MinMaxInt(pDX,this->m_iMin,1,59);
}

The problem which i am facing is that if i enter an invalid value for iMin data variable , the DDV_MinMaxInt function displays a message box without any message in it. How should i display the used defined message in the Message Nox which is being created by DDV_MinMaxInt function?

Regards
Dinesh

Re: DDV functions

David Crow23-Dec-03 4:33

David Crow

23-Dec-03 4:33

Have you stepped into DDV_MinMaxInt() to see why it is failing to retrieve the text?

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Re: DDV functions

Dinesh Ahuja23-Dec-03 17:16

Dinesh Ahuja

23-Dec-03 17:16

I did that :
DDV_MinMaxInt internally calls _AfxFailMinMaxWithFormat function

AFX_STATIC void AFXAPI _AfxFailMinMaxWithFormat(CDataExchange* pDX,
long minVal, long maxVal, LPCTSTR lpszFormat, UINT nIDPrompt)
{
ASSERT(lpszFormat != NULL);
if (!pDX->m_bSaveAndValidate)
{
TRACE0("Warning: initial dialog data is out of range.\n");
return; // don't stop now
}
TCHAR szMin[32];
TCHAR szMax[32];
wsprintf(szMin, lpszFormat, minVal);
wsprintf(szMax, lpszFormat, maxVal);
CString prompt;
AfxFormatString2(prompt, nIDPrompt, szMin, szMax);
AfxMessageBox(prompt, MB_ICONEXCLAMATION, nIDPrompt);
prompt.Empty(); // exception prep
pDX->Fail();
}
The prompt variable comes out to be empty. Do I have to explicitly create a String Resource and pass that resource in one of these functions ?

Regards
Dinesh

Re: DDV functions

David Crow29-Dec-03 2:51

David Crow

29-Dec-03 2:51

So what is the value of CEventDialog::iMin, minVal, and maxVal at this point?

A rich person is not the one who has the most, but the one that needs the least.

Re: DDV functions

Lanka Maheshwar12-Jan-09 18:04

Lanka Maheshwar

12-Jan-09 18:04

Hello,

You can try the following in the OnInitDialog:
CEdit* pEditControl = (CEdit*)GetDlgItem(IDC_EDIT1);
if(pEditControl)
{
pEditControl->SetLimitText(6) ;
}

Hope this works..

Regards,
Maheshwar.

Does STL supports Unicode ???

Prakash Nadar22-Dec-03 17:36

Prakash Nadar

22-Dec-03 17:36

Does STL string support unicode, if so how do i use it.

My God is more powerfull Than Your God. (the line that divides the world)

Re: Does STL supports Unicode ???

Mike Beckerleg22-Dec-03 22:29

Mike Beckerleg

22-Dec-03 22:29

You need to use wstring.

Mike

Re: Does STL supports Unicode ???

jhwurmbach22-Dec-03 22:48

jhwurmbach

22-Dec-03 22:48

std::string is a typedef for std::basic_string<char>
The typedef for wchat_t is called std::wstring.

Who is 'General Failure'? And why is he reading my harddisk?!?

ERROR_ACCESS_DENIED and openprocesstoken()

dp522-Dec-03 17:01

dp5

22-Dec-03 17:01

I am trying to get process status information(cpu time, mem usage, etc) on all processes running on my Win XP system using C.

I have elevated the privilege of the current process to SE_DEBUG_NAME, but I get ERROR_ACCES_DENIED when I call OpenProcessToken() for the the following processes:

alg.exe
svchost.exe
svchost.exe

Task Manager reports that the user names for these processes are LOCAL SERVICE, LOCAL SERVICE, and NETWORK SERVICE respectively.

My goal is to extract the user sid from the process token so that I can display the user name like Task Manager does.

My program works for all other processes (except "idle").

1) What do I have to do to access the tokens for these processes?

It seems as if my current process is denied access to the process
token if the user name is either LOCAL SERVICE or NETWORK SERVICE.

2) How do I extract the same info for the idle process?

Thanks in advance

Daniel

OnkeyDown in dialog

satadru22-Dec-03 16:51

satadru

22-Dec-03 16:51

hi,
have a dialog based application in which i would like to capture the OnKetDown event...but inspite of mapping it thru the Class Wizard ...it doesnt seem to work... what is the reason.....
Satadru.

Re: onkeydown in dialog

Monty²22-Dec-03 17:59

Monty²

22-Dec-03 17:59

try PreTranslateMessage

Live as if your were to die tomorrow. Learn as if you were to live forever.
-Mahatma Gandhi

Re: onkeydown in dialog

satadru22-Dec-03 19:35

satadru

22-Dec-03 19:35

i tried thid but didnt work:
BOOL ControlDialog::PreTranslateMessage(MSG* pMsg)
{
if (pMsg->message==WM_KEYDOWN)
{
MessageBox("I did it!");
}
return CDialog::PreTranslateMessage(pMsg);
}

Re: onkeydown in dialog

zeki yugnak23-Dec-03 1:04

zeki yugnak

23-Dec-03 1:04

hi..

You can use like that..

BOOL CYourDlg::PreTranslateMessage(MSG* pMsg)
    {
    // TODO: Add your specialized code here and/or call the base class
      if(pMsg->message==WM_KEYDOWN)
      {
         UINT nChar=(UINT)pMsg->wParam;
          if(nChar==VK_UP )
          {
            //What you want to do......      
          }
       }
    return CDialog::PreTranslateMessage(pMsg);
    }

good luck.... Smile | :)

Virtual CListView page scrolling

ldaoust22-Dec-03 15:57

ldaoust

22-Dec-03 15:57

I am using a CListView derived class and using it as a virtual list control to display over 30,000 items from a database. Its all working very good, my only complaint is about the scrolling effect when doing a page down or page up. It looks like the whole page is scrolled (up or down) before the items are repainted and is very noticeable. I would like the view to be redrawn faster (avoiding the scroll effect). Just like when you go to the end or top, by pressing the End or Home keys.

I know that the scrolling effect is good when dragging the thumb of the scrollbar, but for page up and down, for an entire page it is not good.

Anyone knows how to get rid of the scrolling affect ?

thanks,
Louis.

Please help! the way using SetBitmap, no memory leak?

twing22-Dec-03 15:26

twing

22-Dec-03 15:26

when i use CStatic::SetBitmap, i don't know if memory leaks in my way.
could u suggest me a good way out of leaking?
Thank u very much!

my way:

CBitmap* pbmp = new CBitmap();
pbmp->LoadBitmap(someID);
pstatic->SetBitmap(*pbmp);
delete pbmp; //sometimes the line is ommitted

Hello World!

Re: Please help! the way using SetBitmap, no memory leak?

Monty²22-Dec-03 18:05

Monty²

22-Dec-03 18:05

if you allocate memory via new operator
then you have to delete it via delete operator
otherwise memory will be leaked

in ur case delete pbmp
would be done in OnDestroy

pbmp should not be a local variable (define it in class)

Live as if your were to die tomorrow. Learn as if you were to live forever.
-Mahatma Gandhi

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