Strange Debuggin Thing - C / C++ / MFC Discussion Boards

Cstring to char??

Larsson24-Aug-04 1:33

Larsson

24-Aug-04 1:33

How can I make a CString to a char?
I don't now how big the CString is so how can I do it?

Please help me.

Re: Cstring to char??

Cedric Moonen24-Aug-04 1:40

Cedric Moonen

24-Aug-04 1:40

CString YourString = "Blahblah";<br />
char* szString = new char[YourString.GetLength()+1];<br />
strcpy(szString,YourString.GetBuffer(YourString.GetLength()) );<br />
//<br />
//<br />
//<br />
//Don't forget to delete the string after use:<br />
delete[] szString;

Hope this helps

Re: Cstring to char??

Larsson24-Aug-04 2:18

Larsson

24-Aug-04 2:18

Thanks that works fine,
You are a life saver..

Re: Cstring to char??

Cedric Moonen24-Aug-04 2:24

Cedric Moonen

24-Aug-04 2:24

Larsson wrote:
You are a life saver..

D'Oh! | :doh:

... Ok, if you say so Laugh | :laugh:

Re: Cstring to char??

David Crow24-Aug-04 3:33

David Crow

24-Aug-04 3:33

cedric moonen wrote:
strcpy(szString,YourString.GetBuffer(YourString.GetLength()) );

While this does work, it would be much simpler with just:

strcpy(szString, YourString);

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Cstring to char??

V.24-Aug-04 3:50

24-Aug-04 3:50

Just to be complete:

I think
char* szString = new char[YourString.GetLength()+1];

doesn't need the +1; (a "\0" is already in the CString)

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

Re: Cstring to char??

jmkhael24-Aug-04 4:23

jmkhael

24-Aug-04 4:23

It does need it, cos the GetLength return the length of the string without the terminating \0

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Strange Debuggin Thing

Paolo Ponzano24-Aug-04 1:13

Paolo Ponzano

24-Aug-04 1:13

hello,
I've some strange problems while debugging, I've one solution with 4 project,2 are exe files, the other 2 are dll.
My problem is I can't see the value of variables while debugging outside the main file.
for example

<br />
case WM_INITDIALOG:<br />
		<br />
		SetWindowPos(hWnd, NULL, wi.rcWindow.left, wi.rcWindow.bottom, 300, 250,  NULL);<br />
		ShowWindow(hWnd,SW_NORMAL);<br />
		//hParser=LoadLibrary("parser.dll");<br />
		if(hParser == NULL)<br />
		{<br />
			MessageBox(hwndMain,"LoadLibrary failed on parser.dll", "Error", MB_ICONERROR|MB_OK);<br />
			break;<br />
		}<br />
		if(!AnalizeMMC(hWnd,NULL))<br />
		{<br />
			MessageBox(hwndMain,"Unable to process multi-media content file", "Error", MB_ICONERROR|MB_OK);<br />
			break;<br />
		}<br />

when I step into AnalizeMMC, that's defined into another .cpp file

<br />
bool AnalizeMMC(HWND hWndMMC,tag *ind)<br />
{<br />
	char temp[30]={0};<br />
	WIN32_FIND_DATA *wfd = new WIN32_FIND_DATA();<br />
	HANDLE hFirstFile=INVALID_HANDLE_VALUE;<br />
	HWND hList=NULL;<br />
	FILE *fd=NULL;<br />
	char test[50]={0};<br />
	hList=GetDlgItem(hWndMMC,IDC_LIST1);<br />
	hFirstFile=FindFirstFile("*.mmc",wfd);<br />
	if (hFirstFile == INVALID_HANDLE_VALUE) return false;<br />
.....<br />

I can't see the value of temp,wfd,hFirstFile and so on...

I receive
wfd CXX0017: Error: symbol "wfd" not found
.......why this happens???, how to fix it?????
the same happens if I refer to content of another project.
Thanks
Paolo

Re: Strange Debuggin Thing

Antony M Kancidrowski24-Aug-04 4:55

Antony M Kancidrowski

24-Aug-04 4:55

Have you tried just debugging the DLL in question?

That is set the DLL to active project / startup project then when prompted for the executable choise the appropriate executable that uses the DLL.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)

type conversion

CShoun24-Aug-04 1:07

CShoun

24-Aug-04 1:07

I want to post the number of recipes I have in a database but when i run the recipe count function i get giberish in the message box.

question: how can i post a interger in the message box?

info: MFC SDI with database support

int count=0;<br />
	CString post="";<br />
<br />
	m_pSet->MoveFirst();<br />
	<br />
	while(m_pSet->IsEOF == FALSE)<br />
	{<br />
		m_pSet->MoveNext();<br />
		count++;<br />
	}<br />
	<br />
	post=count;<br />
<br />
	MessageBox(post);

thanks

Re: type conversion

Antony M Kancidrowski24-Aug-04 1:21

Antony M Kancidrowski

24-Aug-04 1:21

CShoun wrote:
post=count;

MessageBox(post);

Change

post=count;

to

post.Format("%d", count);

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)

sdi

imajit24-Aug-04 0:53

imajit

24-Aug-04 0:53

I have placed a webcontrol on CFormView in a SDI application.I have assigned it a member variable m_webbrowser.
Also i have got a dilogbox derived from Cdialog in my application.
I need to access this m_webbrowser from my dialogbox.
Please let me know how to do it

Re: sdi

David Crow24-Aug-04 3:35

David Crow

24-Aug-04 3:35

When the dialog object is instantiated, pass it a pointer to the m_webbrowser variable.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

MFC and Windows API

SylL24-Aug-04 0:34

SylL

24-Aug-04 0:34

Since I've included a MFC-based dialog in the DLL I am developping, icons that were displayed in a toolbar have disappeared. These icons are managed with Windows API :

tbab.hInst = MaDLL::hInstance ;
tbab.nID = IDB_ICONE_OBM ; // icon id in ressources
val = SendMessage (hwndToolbar, TB_ADDBITMAP, 1, (LPARAM)&tbab) ;

This code worked fine until I have included my dialog box and MFC lib

Re: MFC and Windows API

Anthony_Yio24-Aug-04 0:54

Anthony_Yio

24-Aug-04 0:54

It could be that your IDB_ICONE_OBM is conflicting with other resource ID in resource.h. Remove the duplication if there is.

(You can also use the ResOrg , a small utility written by one of the CPians to resolve the ID conflict.)

Sonork 100.41263:Anthony_Yio

Using acceleraor keys in Dialog application

WesleyPipes24-Aug-04 0:03

WesleyPipes

24-Aug-04 0:03

Hi,

currently I’m migrating a VB program to VC++ 6.0. Some functions in the VB program are called by the function Keys (F2-F12). This function should be in the new program too. My problem is, that I don’t know how to do this. in VB its just the "OnKeykDown". Is there an easy possibility to route the messages from the control which has the focus to the Dialog???

Thx

btw: Sorry for bad english

Re: Using acceleraor keys in Dialog application

Cedric Moonen24-Aug-04 1:04

Cedric Moonen

24-Aug-04 1:04

Are you using the MFC ? If yes, go to the resources tab and there you have the accelerator resource. For each key you want to be used, create a new unique message id (if required) and then add the accelerator with it's associated Id.
Then with ClassWizzard, add a function for each message ID.

Hope this helps

Re: Using acceleraor keys in Dialog application

WesleyPipes24-Aug-04 3:34

WesleyPipes

24-Aug-04 3:34

This doesn't work if you have a Dialog App, but it works in SDI with FormView. So I do it so.

Thanks 4 help

Re: Using acceleraor keys in Dialog application

David Crow24-Aug-04 3:41

David Crow

24-Aug-04 3:41

In the dialog's constructor, you'll need to call LoadAccelerators(). Then you'll need to override the PreTranslateMessage() method like:

BOOL CMyDlg::PreTranslateMessage( LPMSG pMsg ) 
{
    if (NULL != m_hAccelTable) 
    {
        if (::TranslateAccelerator(m_hWnd, m_hAccelTable, pMsg)) 
            return(TRUE);
    }
 
    return CDialog::PreTranslateMessage(pMsg);
}

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Using acceleraor keys in Dialog application

WesleyPipes24-Aug-04 3:55

WesleyPipes

24-Aug-04 3:55

Thats it! Now it works even in a Dialog. Thanks!

Using the timer

wicked_guy24-Aug-04 0:03

wicked_guy

24-Aug-04 0:03

Hi I am controlling an electrical circuit using the computer through the computer ports. I am trying to capture a fast changing analog signal using sampling. So I am just enquiring about the maximum frequency that we could set the timer to using the following function:

SetTimer(1, 2000, 0);

I actually want the timer to interrupt every ten micro seconds (10uS). Is it possible with this type of timers. If not, can anyone guide me to a timer that is capable of doing so.

Thanx in advance

Re: Using the timer

Antony M Kancidrowski24-Aug-04 0:33

Antony M Kancidrowski

24-Aug-04 0:33

Timers are set in milliseconds and therefore do not have the resolution you require.

I suggest that you use another thread to do this work. You could then use the high-resolution performance counters QueryPerformanceCounter() and QueryPerformanceFrequency() to monitor the time.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)

Re: Using the timer

wicked_guy24-Aug-04 0:59

wicked_guy

24-Aug-04 0:59

Are these actually counters or are they functions that retrieve the frequeny and index of a counter?

Check out this link plz.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/timers/timerreference/timerfunctions/queryperformancefrequency.asp

Re: Using the timer

Antony M Kancidrowski24-Aug-04 1:24

Antony M Kancidrowski

24-Aug-04 1:24

I was suggesting that you uses the performance counter functions in order to write your own high-resolution timer.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)

Re: Using the timer

wicked_guy24-Aug-04 1:33

wicked_guy

24-Aug-04 1:33

Ahhaaa.. Ok then, but these are useful functions as well, Thanx Ant.;)

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