Re: Problem with CComboBox::GetItemDataPtr - C / C++ / MFC Discussion Boards

how to convert comma delimited string to unsigned char[]

only_jack4-Aug-09 8:02

4-Aug-09 8:02

i have a byte array in a string that i read from a resource
i used CString for example , i can use any other string types

i want to convert a comma delimited byte array string

CString stringarr = "5,10,15,20,25";

to unsigned char[]

unsigned char myarray[]={5,10,15,20,25};

i tried some for loop but result is always different than actual data

maybe i am doing something wrong with that

can you help me please

thanks.

Re: how to convert comma delimited string to unsigned char[]

Cedric Moonen4-Aug-09 8:08

Cedric Moonen

4-Aug-09 8:08

You should take a look at the strtok_s[^] function. There's even a very similar example as yours.

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Re: how to convert comma delimited string to unsigned char[]

CPallini4-Aug-09 11:34

CPallini

4-Aug-09 11:34

Have also a look at CString::Tokenize method [^].
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Codepage 936

gothic_coder4-Aug-09 7:28

gothic_coder

4-Aug-09 7:28

How to add codepage 936 in VC++ ?

Re: Codepage 936

David Crow4-Aug-09 10:12

David Crow

4-Aug-09 10:12

How about _setmbcp(936)?

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Problem with CComboBox::GetItemDataPtr

Nitheesh George4-Aug-09 5:02

Nitheesh George

4-Aug-09 5:02

Hi,

I am getting a problem with the CComboBox::GetItemDataPtr function

i have the following code

TCHAR *szFilePath = new TCHAR[MAX_PATH + 1];
ZeroMemory(szFilePath ,MAX_PATH);
_tcscpy(szFilePath ,_T("C:\Documents and Settings\user\Desktop\Scrollbar.xml"));

int nIndex = m_Combo.AddString(_T("ScrollBar"));
m_Combo.SetItemDataPtr(n , szFilePath);

using the Above code am setting the ItemDataPtr to a Buffer.

On the Selection change event of ComboBox

i have the following code

void CRegDlg::OnCbnSelchangeCombo()
{
// TODO: Add your control notification handler code here
int nIndex = m_Combo.GetCurSel();
void *szFilePath = m_Combo.GetItemDataPtr(n);
}

but the GetItemDataPtr() in OnCbnSelchangeCombo always returns a Bad
pointer. I don't know what is the actual problem with my code. Is there anything i want to do to get the actual buffer from void*.

thanks

Nitheesh

Jose Jo Martin

http://www.simpletools.co.in

Re: Problem with CComboBox::GetItemDataPtr

David Crow4-Aug-09 5:33

David Crow

4-Aug-09 5:33

Nitheesh George wrote:
_tcscpy(szFilePath ,_T("C:\Documents and Settings\user\Desktop\Scrollbar.xml"));

Are you intentionally not using double backslashes?

Nitheesh George wrote:
m_Combo.SetItemDataPtr(n , szFilePath);

Shouldn't this be:

m_Combo.SetItemDataPtr(nIndex, szFilePath);

Nitheesh George wrote:
void *szFilePath = m_Combo.GetItemDataPtr(n);

Shouldn't this be:

TCHAR *szFilePath = m_Combo.GetItemDataPtr(nIndex);

Re: Problem with CComboBox::GetItemDataPtr

Nitheesh George4-Aug-09 5:48

Nitheesh George

4-Aug-09 5:48

Hi David,

thank you for your reply. Now i realize what is wrong with my code.

thanks

Nitheesh

Jose Jo Martin

http://www.simpletools.co.in

[Message Deleted]

neha_rai4-Aug-09 4:56

neha_rai

4-Aug-09 4:56

[Message Deleted]

Re: Simplification of code

David Crow4-Aug-09 5:37

David Crow

4-Aug-09 5:37

neha_rai wrote:
i have written this code that splits the number of cars T. to the number of paths R in all possible ways.

Sounds like you need to read up on combinations and permutations.

Copying only a sinlge dialog box from one application to other application

sunny_vc4-Aug-09 4:28

sunny_vc

4-Aug-09 4:28

Hi all,
I have two applications in VC6.
I have to copy only a single dialog box (not the entire RC file) from one application
to other.
I know we can copy the RC file , but I dont want the entire RC file.
I want to copy only one dialog box from the one RC file and paste in other RC file.
Please suggest.

Regards,
Sunil Kumar

Re: Copying only a sinlge dialog box from one application to other application

Nitheesh George4-Aug-09 5:10

Nitheesh George

4-Aug-09 5:10

Hi,
Open the rc file on a notepad or if u r using VS2005 or greater right click on the rc file -> View Code

copy the Dialog declaration's and paste it into your rc file.

thanks

Nitheesh

Jose Jo Martin

http://www.simpletools.co.in

A little further

EliottA4-Aug-09 4:14

EliottA

4-Aug-09 4:14

So I've taken it apon myself to finally get a better grasp on C++. I've had experience in C#, VB.Net and Java and decided, on my own time, to finish the jump into C++.

I've read a book entitled C++, How to program by Deitel, and it is by far way better then the C++ Primer Plus I went through and entirely better then the mistake that was "C++ in 21 days" which was a complete waste of time.

I think I have a handle on the basic concepts, syntax and whatever else the book went through and I think I'm ready to tackle a book that deals with C++ and the MFC. Anyone out there who's been at where I am, still a beginner ready to tackle new concepts (as I've been explained, MFC is where I should go) can please recommend a good reference / beginners book on C++/MFC? Any links on the internet? Anything at all to make a good jump?

A book / article that deals with C++/MFC and using Visual Studio as a compiler is a plus, and any help at all would be greatly recommended. Thanks for the read in advance,

Elie.

Check out the CodeProject forum Guidelines[^]
The original soapbox 1.0 is back![^]

Re: A little further

Rajesh R Subramanian4-Aug-09 5:24

Rajesh R Subramanian

4-Aug-09 5:24

Hi Elie,

I'm pleased to see a .NET programmer wanting to learn Visual C++. My MFC book recommendations are here[^]. I'm sure that others here will be able to provide you with more inputs on that.

Additionally, Thinking in C++ is an excellent, two part book by Bruce Eckel and is freely (and legally) available for download on his site. You can download it : here[^] (the link is actually a mirror, because Bruce's site seem to take too long to load). I did notice you saying that you've done the basics, but this book(s) is one of my favourite C++ books and is worth a read, if you haven't read it yet. Smile | :)

It is a crappy thing, but it's life -^ Carlo Pallini

How to compare a string output to a map where keys are also the same strings?

Waldemar Ork4-Aug-09 3:57

Waldemar Ork

4-Aug-09 3:57

I've been reading o lot on the topic of comparisons in the web lately and I can't find anything interesting. The question is how to compare string output to a map where keys are alike defined strings which represent vectors of integers. I guess I'll have to write a template or a class to do it and it isn't an easy task for the beginner. I would be very grateful for any kind of help!
Waldemar

Re: How to compare a string output to a map where keys are also the same strings?

«_Superman_»4-Aug-09 18:43

«_Superman_»

4-Aug-09 18:43

Not sure if I understand your question correctly.
But there is a map class in the C++ Standard Template Library.

You are probably looking for something like -
typedef std::map<std::string, std::vector<int>> StringIntVectorMap;

So you can create objects of this type -
StringIntVectorMap compare;

Read more about the map class here - map Class[^]

«_Superman_»
I love work. It gives me something to do between weekends.

Re: How to compare a string output to a map where keys are also the same strings?

Waldemar Ork4-Aug-09 21:48

Waldemar Ork

4-Aug-09 21:48

Thanks Superman
I'll have a look at it!

Re: How to compare a string output to a map where keys are also the same strings?

Waldemar Ork5-Aug-09 6:29

Waldemar Ork

5-Aug-09 6:29

Unfortunately, your hint won't work. I've just realized I've reached a stage that could be called 'advanced programming'. If you're interested in this particular case, I can quote the entire code. Just let me know, providing you've got time to look at it. Anyway, thanks a lot!

COM port CreateFile -> Close Handle Works great, unless the USB device is unplugged, then it can not be reopened without restarted computer

Greg Mort4-Aug-09 3:42

Greg Mort

4-Aug-09 3:42

COM port CreateFile -> Close Handle Works great, unless the USB device is unplugged, then it can not be reopened without restarted computer

If usb device is ever unplugged, i get a return of a ERROR_FILE_NOT_FOUND from Create handle, and cannot continue unless the computer is restarted

this happens when I am connected to the device and when I am not connected, just if it is unplugged and replugged in

(this works awesome, and can continue to create and close, until the device is unplugged from the computer and plugged back in)

hcomms[hcommcount-1] = CreateFile(com, 
 GENERIC_READ | GENERIC_WRITE,
 0,
 0,
 OPEN_EXISTING,
 FILE_ATTRIBUTE_NORMAL /*| FILE_FLAG_OVERLAPPED*/,
 0);

 if ( hcomms[hcommcount-1] == INVALID_HANDLE_VALUE)
 {
 DWORD error = GetLastError();
 return -1;
 }

if (!CloseHandle(hcomms[cindx]))
 {
 errorCode = GetLastError();
 }

Re: COM port CreateFile -> Close Handle Works great, unless the USB device is unplugged, then it can not be reopened without restarted computer

Randor 4-Aug-09 3:54

Randor

4-Aug-09 3:54

Greg Mort wrote:
COM port CreateFile -> Close Handle Works great, unless the USB device is unplugged

What kind of USB device? Is this a USB to Serial adaptor? Can we get a little more information?

Re: COM port CreateFile -> Close Handle Works great, unless the USB device is unplugged, then it can not be reopened without restarted computer

Greg Mort4-Aug-09 4:26

Greg Mort

4-Aug-09 4:26

its a custom made device, it uses the mchpcdc drivers

Re: COM port CreateFile -> Close Handle Works great, unless the USB device is unplugged, then it can not be reopened without restarted computer

Randor 4-Aug-09 4:41

Randor

4-Aug-09 4:41

Well Greg,

I would be willing to bet that each time you plug-in the USB device Microsoft Windows is assigning a new COM port.

Best Wishes,
-David Delaune

convert wchar* to byte*

Rakesh54-Aug-09 3:42

Rakesh5

4-Aug-09 3:42

hi,

can anyone suggest me how to convert wchar* to byte*...

Thanks,
Rakesh

Re: convert wchar* to byte*

Randor 4-Aug-09 3:50

Randor

4-Aug-09 3:50

You can simply cast the pointer to PBYTE or BYTE*

wchar_t buf[] = L"Hello World";
PBYTE pBytes = (PBYTE)buf;

Best Wishes,
-David Delaune

Re: convert wchar* to byte*

Rakesh54-Aug-09 4:12

Rakesh5

4-Aug-09 4:12

hey,

its not converting fully...

if i have wchar* q = "AJC";

when i convert it using ur method,

PBYTE pbytes = (PBYTE)q;

its giving pbytes as C alone...

can u shed some light on it?

Thanks,
Rakesh

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