C / C++ / MFC Discussion Boards

read data from digital camera

includeh1030-Jun-03 2:39

includeh10

30-Jun-03 2:39

how to read data from digital camera?

includeh10

Re: read data from digital camera

basementman30-Jun-03 4:39

basementman

30-Jun-03 4:39

Typically, the CF card is exposed as a disk drive. When your camera is attached to your computer, see if you can browse to it in explorer. On mine, I have full read/write access and can drag and drop files from the camera to the hard disk using explorer. Assuming that this works the same on yours, simply use the standard file functions to read the files from the CF card.

onwards and upwards...

Serial Comms TimeOut Formula

louis30-Jun-03 2:27

louis

30-Jun-03 2:27

Hi all,

Does anyone perhaps know what the CommTimeOuts formula is for determining ReadIntervalTimeout or where can I find it?

How do I determine what value to assign when receiving total bits of 10 per character, at 9600 baud?

Any help/advise would be appreciated.

Thanks

Louis

Re: Serial Comms TimeOut Formula

louis30-Jun-03 3:26

louis

30-Jun-03 3:26

Thanks.

Is there a minimum Asynch Timeout value.

Cheers

Louis

MFC Edit Ctrl

frackasse30-Jun-03 2:24

frackasse

30-Jun-03 2:24

I ve got a DialogBox with one ComboBox and 2 EditBox.

If the user choose for example : "dog"in the combobow i want that one of the edit can not be edited (set read only)..

Fot that i use that :

void CDialogBoxClass::OnSelchangeComboEvent()
{ UpdateData(true);
if(m_combo=="dog")
m_editctrl.EnableWindow(FALSE);
else
m_editctrl.EnableWindow(TRUE);
}

The problem is that this function start before the new value of m_combo would be assigned in the comboBOx.... if someone could help me

Frackasse

Re: MFC Edit Ctrl

David Crow30-Jun-03 2:40

David Crow

30-Jun-03 2:40

I'm guessing that you are calling SetCurSel() in the dialog's OnInitDialog() method. Add a variable m_bInitializing of type bool to your dialog class and set it to false in the constructor. At the beginning of OnInitDialog(), set it to true, and at the end of OnInitDialog(), right before the return statement, set it to false.

void CDialogBoxClass::OnSelchangeComboEvent() 
{
    CString str;

    if (! m_bInitializing)
    {
        m_comboctrl.GetWindowText(str);
        if ("dog" == str)
            m_editctrl.EnableWindow(FALSE);
        else
            m_editctrl.EnableWindow(TRUE);
    }
}

Re: MFC Edit Ctrl

frackasse30-Jun-03 3:04

frackasse

30-Jun-03 3:04

i tried what u write but it is exactly the same result... maybe u don t understand my question : if i use this :

void CAddEvent::OnSelchangeComboEvent()
{ CString str;
m_eventcontrol.GetWindowText(str);
MessageBox(str);
}
The messageBox returns me the old value of the CString in the comboBox (means not the new value the user has choosen but the value he wants to change) so the problem is when i want to know if(str=="dog") str is not the right CString....

Frackasse

Re: MFC Edit Ctrl

David Crow30-Jun-03 3:22

David Crow

30-Jun-03 3:22

The CBN_SELCHANGE notification message is sent when the user changes (note the past tense here) the current selection in the list box of a combo box. Not seeing the rest of your code, I can only hypothesize. Another solution might be:

CString str;<br />
int nIndex = m_comboctrl.GetCurSel();<br />
m_comboctrl.GetLBText(nIndex, str);

,Serial Comms TimeOut Formula

louis30-Jun-03 2:23

louis

30-Jun-03 2:23

Hi all

How to covert CString to TCHAR and CString to LPCWSTR?

julych30-Jun-03 1:26

julych

30-Jun-03 1:26

How to covert CString to TCHAR and CString to LPCWSTR?
Where can I read about this?

Re: How to covert CString to TCHAR and CString to LPCWSTR?

RChin30-Jun-03 1:39

RChin

30-Jun-03 1:39

If you need to copy a CString object to an array of TCHAR you could do:

<font color="green">
// assume strText is your CString ...
</font>

TCHAR *czArray = NULL; 

<font color="green">// allocate character array</font>
czArray = new TCHAR[strText.GetLength() + 1]; 
_tcscpy(czArray, (LPCTSTR)strText);

<font color="green">// DO WHATEVERR

// Cleanup</font>
delete [] czArray;

The CString object has the LPCTSTR operator cast, so you can just cast your CString object to a LPCWSTR (LPCSTR if not unicode). Note that this is used in the above example for the _tcscpy function

For further reading, have a look at the strings section of Codeproject, there are a few good articles that is a must-read.

"..Even my comments have bugs!"

Inspired by Toni78

Re: How to covert CString to TCHAR and CString to LPCWSTR?

Peter Weyzen30-Jun-03 8:45

Peter Weyzen

30-Jun-03 8:45

the easy way:

<br />
USES_CONVERSION;<br />
<br />
CString Str(_T("This is my string"));<br />
<br />
// explicit copy as single byte chars (LCPSTR)<br />
char charBuf[255];<br />
strcpy( charbuf, T2CA(Str) );<br />
<br />
// explicit copy as wide chars (LPCWSTR)<br />
wchar_t wcharBuf[255];<br />
wsccpy( wcharBuf, T2CW(Str) );<br />
<br />
// generic TCHAR copy (LPCTSTR)<br />
TCHAR tcharBuf[255];<br />
_tcscpy( tcharBuf, Str );<br />

this works in UNICODE and non-UNICODE.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
Santa Cruz Networks

pointer to the app

andyg.10130-Jun-03 1:16

andyg.101

30-Jun-03 1:16

Hi i've got an object that I want to use with a number of dialogues, so I declared it in my App class, and I was then going to use a pointer to the app object to acess it in all my dialogues.

How do I get the pointer to the app to access the object?

At the moment I have something like
CtheApp* m_pApp;

but how do I initialise the pointer to point at the app?

I tried something like
m_pApp = &theApp;
but I just get the compiler saying that theApp is an undeclared variable but I thought it was a global. Can someone enlighten me as to the way to proceed?
Thanks
Andy

Re: pointer to the app

RChin30-Jun-03 1:43

RChin

30-Jun-03 1:43

<br />
CMyApp* theApp = static_cast<CMyApp*>(AfxGetApp());<br />

"..Even my comments have bugs!"

Inspired by Toni78

Re: pointer to the app

andyg.10130-Jun-03 2:21

andyg.101

30-Jun-03 2:21

nice one, thanks, but what is the
static_cast for can't I just use AfxGetApp on its own?
Andy

Re: pointer to the app

David Crow30-Jun-03 2:43

David Crow

30-Jun-03 2:43

Yes, but it will return you a CWinApp pointer, not a CtheApp pointer. That's why it must be cast to the appropriate type.

Re: pointer to the app

RChin30-Jun-03 3:23

RChin

30-Jun-03 3:23

DavidCrow wrote:
Yes, but it will return you a CWinApp pointer, not a CtheApp pointer

Exactly.
AfxGetApp() Returns a CWinApp class pointer. If you want to reference your specific class, you have to cast the returned pointer to your application class. This will allow you to access your member functions. The olden way of casting used to be of the form:

CMyClass* pClass = (CMyClass*)(ParentClass);
<pre>
</code>

But the (now) standard way of casting C++ classes take the form:
<pre>
<code>
CMyClass* pClass = static_cast<CMyClass*>(ParentClass);
</code>

"..Even my comments have bugs!"

Inspired by Toni78

Visual Studio 6.0

Bernhard30-Jun-03 1:13

Bernhard

30-Jun-03 1:13

okay.. i don't know if this is the right forum..
can anybody explain me the regular expression search & replace utility?
(or is there any documentation on this topic.. i couldn't find any)..
e.g. i want to change all the occurences of char XXX[] to const char* XXX
it would be something like
char(.*)?\[\] (at least as much as i know)
now i would have to replace this with const char* $1
how to do this with the find / replace dialog.

would be very handy if it worked..

bernhard

"I'm from the South Bronx, and I don't care what you say: those cows look dangerous."
U.S. Secretary of State Colin Powell at George Bush's ranch in Texas

Re: Visual Studio 6.0

Ryan Binns30-Jun-03 2:27

Ryan Binns

30-Jun-03 2:27

Find: char $.*$\[\]
Replace: const char *\1

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"

Got problems with COptionTree

mike :D30-Jun-03 0:16

mike :D

30-Jun-03 0:16

Hi!
I tryed to use http://www.codeproject.com/treectrl/coptiontree.asp
During the compilation i got following error

MainFrm.obj : error LNK2001: unresolved external symbol Symbol "public: virtual __thiscall COptionTree::~COptionTree(void)" (??1COptionTree@@UAE@XZ)
MainFrm.obj : error LNK2001: unresolved external symbol "public: __thiscall COptionTree::COptionTree(void)" (??0COptionTree@@QAE@XZ)
MainFrm.obj : error LNK2001: unresolved external symbol "public: int __thiscall COptionTree::Create(unsigned long,struct tagRECT,class CWnd *,unsigned long,unsigned int)" (?Create@COptionTree@@QAEHKUtagRECT@@PAVCWnd@@KI@Z)

I've added the lib from COptionTree in my Project and put the DLL in my Debug folder.
What have i done wrong?
Thx mike

Re: Got problems with COptionTree

Dominik Reichl30-Jun-03 0:41

Dominik Reichl

30-Jun-03 0:41

Do you include the header file for the lib?

-Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??

Re: Got problems with COptionTree

mike :D30-Jun-03 2:00

mike :D

30-Jun-03 2:00

Hi!
Yes, I have added #include "OptionTree.h" to my *.h were the Instance of COptionTree is declared.

mike

Re: Got problems with COptionTree

mike :D30-Jun-03 4:01

mike :D

30-Jun-03 4:01

Hi!
Where can i get a sample build with a DLL? Can somebody send it to me?
pleeaazzze Smile | :)

mvodep@gmx.net

thx mike

about disable or enable Network card

BensonCHUANG30-Jun-03 0:06

BensonCHUANG

30-Jun-03 0:06

hi..
Please tell me How disable or enable a NIC using MFC class.
like on widows system to double-click My Computer, Control Panel, and System.
then Click the Hardware tab and Device Manager.
Under Network Adapters, desable or enable the Network card.
can u help me?!

thank a lot.
Confused | :confused:

/neil

SADAS

Disassembler for IBM PC (SoftIce)

BhaskarBora29-Jun-03 23:45

BhaskarBora

29-Jun-03 23:45

Can anyone tell me where can I find a dis-assembler for pc? I have heard of a popular software called SoftIce. If any one can tell me about SoftIce then it would be great ! thanks in advance

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