C / C++ / MFC Discussion Boards

Re: basic string question

C^hris L^osinger3-Jul-06 4:02

C^hris L^osinger

3-Jul-06 4:02

strncpy(Arr, lpcstr, 255);
Arr[254] = 0; // just to be safe

Cleek | Image Toolkits | Thumbnail maker

Re: basic string question

Zac Howland3-Jul-06 6:37

Zac Howland

3-Jul-06 6:37

If you can modify the function (that is, you control it), you can make the return value part of the function arguments:

void getMyString(char[255]& retString)
{
   memset(retString, 0, 255);
   // do stuff here
   // declare and initialize srcString somewhere
   strncpy(retString, srcString, 254);
}

If you don't have access, or are not allowed to change the interface, here are some alternatives:

char buffer[255] = {0};
strncpy(buffer, myFunction(), 254);

std::string myString = myFunction();

Note that both of those can be sketchy if the returning function is allocating memory on the heap and expecting you to handle cleanup (very poor design, but not too uncommon, sadly). Just keep that in mind when dealing with this kind of thing.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Re: basic string question

Roland Pibinger3-Jul-06 9:01

Roland Pibinger

3-Jul-06 9:01

Zac Howland wrote:
void getMyString(char[255]& retString)

That won't work.

Re: basic string question

Zac Howland3-Jul-06 9:12

Zac Howland

3-Jul-06 9:12

You are correct. Sorry, it should have been:

void getMyString(char retString[255])

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

creating file, path name more than 300 characters

Lokesh Murthy3-Jul-06 3:44

Lokesh Murthy

3-Jul-06 3:44

MSDN document says.
-------------------
Maximum Path Length

In the Windows API, the maximum length for a path is MAX_PATH, which is defined as 260 characters. A path is structured in the following order: drive letter, colon, backslash, components separated by backslashes, and a null-terminating character, for example, the maximum path on the D drive is D:\<256 chars>NUL.

The Unicode versions of several functions permit a maximum path length of approximately 32,000 characters composed of components up to 255 characters in length. To specify that kind of path, use the "\\?\" prefix.

How do we create a file with path name more 260 characters ?.
============================================================

Lokesh
HP

move data to sql db

PhilWalker3-Jul-06 3:27

PhilWalker

3-Jul-06 3:27

I need to write the code to move data inputted by the user, to a SQL database... can anyone help me start this.... i'm not too familiar with visual studio yet

Cheers .. Phil

TOOLTIP

ashish dogra3-Jul-06 3:24

ashish dogra

3-Jul-06 3:24

i want to know that CTTListBox is not in the listbox type as i want to declare a variable of this type.
when i decalare this directly or by changing CListBox type then it gives error
plz tell me how can i use this

Ashish Dogra
MCA
Noida

Re: TOOLTIP

C^hris L^osinger3-Jul-06 3:46

C^hris L^osinger

3-Jul-06 3:46

try asking on the page for CTTListBox[^].

Cleek | Image Toolkits | Thumbnail maker

how to create a Splitter Window

Uday Janaswamy3-Jul-06 3:13

Uday Janaswamy

3-Jul-06 3:13

hi all,

i wantto create a Splitter View Please help me out.

thanks and regards,
uday.

Re: how to create a Splitter Window

Tara143-Jul-06 3:46

Tara14

3-Jul-06 3:46

Call OnCreateClient in you CMainFrame class and make the changes approprialtely.

BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext) 
{
	// TODO: Add your specialized code here and/or call the base class

	// create a splitter with 1 row, 2 columns
	if (!m_wndSplitter.CreateStatic(this, 1, 2))
	{
		TRACE0("Failed to CreateStaticSplitter\n");
		return FALSE;
	}


	// add the second splitter pane - an input view in column 1
	if (!m_wndSplitter.CreateView(0, 1,
		pContext->m_pNewViewClass, CSize(0, 0), pContext))
	{
		TRACE0("Failed to create first pane\n");
		return FALSE;
	}

	// add the first splitter pane - the default view in column 0
	if (!m_wndSplitter.CreateView(0, 0,
		pContext->m_pNewViewClass, CSize(200, 0), pContext))
	{
		TRACE0("Failed to create second pane\n");
		return FALSE;
	}

	// activate the input view
	SetActiveView((CScrollView*)m_wndSplitter.GetPane(0,1));

	return true;
//	return CFrameWnd::OnCreateClient(lpcs, pContext);
}

Hope that helps.

Fortitudine Vincimus!

Processing 'X' buttons message

Tara143-Jul-06 3:12

Tara14

3-Jul-06 3:12

Hi,

I want to add some code when the 'X' button on the top right of a dialog box is pressed. For example if the window size is changed, maximises/minimised we add the code in OnSize() function (WM_SIZE).

Please can you tell me how to know when the 'X ' button is pressed.

Thanks,
Tara

Fortitudine Vincimus!

Re: Processing 'X' buttons message

Don Box3-Jul-06 3:33

Don Box

3-Jul-06 3:33

Handle WM_CLOSE Message.

Jubin Chawda
braindrain1@rediffmail.com
-----------------------------
Come online at:-
fitiyal@yahoo.com

Re: Processing 'X' buttons message

Tara143-Jul-06 3:35

Tara14

3-Jul-06 3:35

Yes, of course!! Silly of me. I did not see properly.

Thank you.

Fortitudine Vincimus!

Re: Processing 'X' buttons message

Hamid_RT3-Jul-06 3:39

Hamid_RT

3-Jul-06 3:39

yes you can useWM_CLOSE if this is your question or you want to write your button instead Close button

whitesky

Re: Processing 'X' buttons message

Tara143-Jul-06 3:43

Tara14

3-Jul-06 3:43

I want a message box to appear asking the user if he wants to save his work when he closes the dialog box.

Fortitudine Vincimus!

Re: Processing 'X' buttons message

Hamid_RT3-Jul-06 3:53

Hamid_RT

3-Jul-06 3:53

int int nIndex=MessageBox("Are your sure to exit,"Question",MB_YESNO); and check return value

whitesky

Re: Processing 'X' buttons message

Tara143-Jul-06 5:01

Tara14

3-Jul-06 5:01

Yes. Thank you.

Fortitudine Vincimus!

Problem with CreateProcess

rajeevktripathi3-Jul-06 2:13

rajeevktripathi

3-Jul-06 2:13

Hi All
I am having a problem in my application, what I am doing is:
Calling a function SaveKeys(TCHAR *) within a loop and this function save the specified registry key to a .reg file,
for this using CreateProcess( ) for calling regedit.exe from command line and WaitForSingleObject( ) function.
code looks like this

<br />
for (int i = 0; i < 10; i++)<br />
{<br />
    // some code here<br />
   SaveKeys(cRegistryKey );  // for specified Registry Key<br />
}<br />
<br />
void MyClass::SaveKeys(TCHAR *cRegistryKey)<br />
{<br />
        STARTUPINFO			StartupInfo;<br />
	PROCESS_INFORMATION ProcessInformation;<br />
  <br />
        CreateProcess(NULL, cCommand,NULL,NULL,FALSE,CREATE_DEFAULT_ERROR_MODE|CREATE_SUSPENDED,NULL, NULL, &StartupInfo, &ProcessInformation);<br />
WaitForSingleObject( ProcessInformation.hProcess, INFINITE );<br />
<br />
}<br />
//e.g. Here cCommand  = regedit /e C:\File.reg HKEY_CURRENT_USER\MyKey<br />

Now what is my problem is that here WaitForSingleObject( ) function is not working. and only a single reg file is created.
and when use Sleep(1000) then all the 10 reg file are created.

So please tell me that how should I overcome this problem.

Please reply
Thanks

Re: Problem with CreateProcess

Garth J Lancaster3-Jul-06 2:23

Garth J Lancaster

3-Jul-06 2:23

why bother shelling an external process when you can use something like

http://www.codeproject.com/system/NtRegistry.asp[^]

to do it directly from your program - if you look under http://www.codeproject.com/system[^] you'll find lots more goodies to help you

'g'

Re: Problem with CreateProcess

Viorel.3-Jul-06 2:30

Viorel.

3-Jul-06 2:30

Uninitialized STARTUPINFO structure is one of the problems of your code. It can be fixed like this:

STARTUPINFO StartupInfo = { sizeof(STARTUPINFO) };

Re: Problem with CreateProcess

Viorel.3-Jul-06 2:47

Viorel.

3-Jul-06 2:47

In addition, it seems that the invoked regedit tools cannot work in multi-instance mode. For example, I cannot start more then one regedit application from Windows menu or command line. That's why only some of your calls work.

This probably means that you cannot do multi-threaded export using regedit tool.

Re: Problem with CreateProcess

valikac3-Jul-06 6:44

valikac

3-Jul-06 6:44

CREATE_SUSPENDED

ResumeThread()

Kuphryn

about timer

happy_ram3-Jul-06 1:53

happy_ram

3-Jul-06 1:53

iam calling the function from another class.in that function i have SetTimer(0,1000,NULL).
but it will no work.
ONTimer is not calling.
ram.

Re: about timer

Maximilien3-Jul-06 1:57

Maximilien

3-Jul-06 1:57

do you have an HANDLER ( ON_WM_TIMER ) for the timer ?

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: about timer

happy_ram3-Jul-06 2:00

happy_ram

3-Jul-06 2:00

yah

void CMPEGPlayerDlg::OnPlay() 
{

	// TODO: Add your control notification handler code here


     
	 Onstop();
	
	  int k = m_list7.GetCurSel();
	
	  	 m_list7.GetText(k,m_SongName);
		if(!m_SongName.IsEmpty()) 
	 {
			  OpenNew(m_SongName);
			 MessageBox(m_SongName);
	 }
	 if(m_Player.PlayerMode() == pmReady) 
	 {
	  MessageBox("bye");
		 m_Player.Play();
	 }
			SetTimer(0, 1000, NULL);
}

here it is working because it is in the same class
where as

void CMPEGPlayerDlg::OnPlay(CString string)
{
Onstop();
	
	/*  int k = m_list7.GetCurSel();
	  CString str;
	  str.Format("%d",k);
	  MessageBox(str);
	  	 m_list7.GetText(k,m_SongName);*/
	 m_SongName=string;
		if(!m_SongName.IsEmpty()) 
	 {
			  OpenNew(m_SongName);
			  MessageBox(m_SongName);
	 }
	 if(m_Player.PlayerMode() == pmReady) 
	 {
	  MessageBox("hi");
		 m_Player.Play();
	 }	
SetTimer(ID_TIMER, 1000,NULL);
	
}

herer not working because this fuction is calling from different class.
ram

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