C / C++ / MFC

JohnnyG30-May-02 10:58

JohnnyG

30-May-02 10:58

You lost me. I don't see where basic_ostringstream's constructor takes a TCHAR pointer. And, if you meant char pointer, I still have to convert from ANSI to Unicode and would still need the #ifdef _UNICODE so that I can convert for NT but not for Win 9x. Could you clarify, please? Thanks.

Rama Krishna Vavilala30-May-02 11:04

Rama Krishna Vavilala

30-May-02 11:04

It was a typo Frown | :(

Here is the complete code

TCHAR* TRadar::GetString(TCHAR *buff)
{
_tostringstream os;
os << radarTag.GetString() << " " << maxRange << " " << scanTime;

_tcscpy(buff, os.str().c_str());

return buff;
}

(It is not as efficient as strstream but strstream is not in the Standard C++ lib anymore.)

JohnnyG31-May-02 3:44

JohnnyG

31-May-02 3:44

I must be missing something. I get what you are saying about using _tcscpy() but the second parameter in the code you posted would be an ANSI string which would work if _UNICODE is not defined. But if it is, then I would get a compile error: cannot convert parameter 2 from 'const char *' to 'const unsigned short *'

I have researched that there is a "wide char" version of this ostringstream class called, wostringstream. But, I would run into the same problem when it comes to converting it in the _tcscpy(). That is, if I am using .c_str(). How do I convert properly?

Rama Krishna Vavilala31-May-02 3:43

Rama Krishna Vavilala

31-May-02 3:43

JohnnyG wrote:
I must be missing something

I lost the <> in HTML conversions so my code which typedefs actually looks like

typedef std::basic_ostringstream<TCHAR> _tostringstream;

setting text inside CHtmlView

JohnnyG31-May-02 3:54

JohnnyG

31-May-02 3:54

Oh-h-h-h! Now, I get it. That makes sense. It works now. Thanks alot for your help Rama!

Current time

esapp42030-May-02 8:49

esapp420

30-May-02 8:49

Anybody out there know how can I get the current GMT from a website such as worldtimeserver.com using CInternetSession?? I need a reliable timestamp that is not attached to the user's system time.
Any tips would be appreciated!

Its always 4:20 somewhere!

Re: Current time

Ravi Bhavnani30-May-02 9:18

Ravi Bhavnani

30-May-02 9:18

This would be an excellent example of a web resource provider! You can use this framework to write it.

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Re: Current time

Bill Wilson30-May-02 11:56

Bill Wilson

30-May-02 11:56

try this

http://www.time.gov/timezone.cgi?GMT/d/0/

When I did this from their web page, it looked like the GMT is simply used for display purposes. the 0 is used as an offset from GMT. E.G. PDT is -8.

Hope this helps,
Bill

Big B30-May-02 8:34

Big B

30-May-02 8:34

I would like to set the HTML inside a CHtmlView without browsing to a site or reading a file. So far the best bet is using GetHtmlDocument and then using the write method of the IHtmlDocument interface, but I have not been too successful since I havent much experience with MFC and OLE.

If there is a better way too do it or if you would be kind enough to post some code it would be much appreciated.

Thanks in advance.

Re: setting text inside CHtmlView

S Fewings30-May-02 20:30

S Fewings

30-May-02 20:30

Try using the write and writeln methods on teh IHTMLDocument2 interface
Here is some code I got from an MS sample somewhere
// Get the pDoc interface from the CHtmlView
IHTMLDocument2 *pDoc; // Declared earlier in the code
IDispatch* pDisp = GetHtmlDocument();
HRESULT hr;
hr = pDisp->QueryInterface( IID_IHTMLDocument2, (void**)&pDoc );

if( pDoc )
{
HRESULT hresult = S_OK;
VARIANT *param;
SAFEARRAY *sfArray;
BSTR bstr = csText.AllocSysString();

// Creates a new one-dimensional array
sfArray = SafeArrayCreateVector(VT_VARIANT, 0, 1);

if (sfArray == NULL || pDoc == NULL)
{
goto cleanup;
}
hresult = SafeArrayAccessData(sfArray,(LPVOID*) & param);
param->vt = VT_BSTR;
param->bstrVal = bstr;
hresult = SafeArrayUnaccessData(sfArray);
hresult = pDoc->writeln(sfArray);
cleanup:
SysFreeString(bstr);
if (sfArray != NULL)
{
SafeArrayDestroy(sfArray);
}
}

Also have a look at the tutorial by Philip Patrick
http://www.codeproject.com/internet/parse_html.asp

User draw Combobox - MeasureItem doesn't get called!?

30-May-02 6:57

As the title says, MeasureItem just doesn't get called except for couple times at the beginning (I found that out with a debugger). It doesn't matter what height I make MeasureItem set, the effect never shows. Also ownderdraw fixed is UNset and ownerdraw variable is SET, and this class was working correctly in another application.

Here is some codes:
BOOL CMultiLineComboBox::PreCreateWindow (CREATESTRUCT& cs)
{
if (!CComboBox::PreCreateWindow (cs))
return FALSE;

cs.dwExStyle |= WS_EX_CLIENTEDGE;
cs.style &= ~( CBS_OWNERDRAWFIXED | CBS_SORT );
cs.style |= ( CBS_OWNERDRAWVARIABLE | CBS_DROPDOWNLIST | CBS_HASSTRINGS );
return TRUE;
}

It is used like this:
m_pcomboGap[i] = new CMultiLineComboBox();
m_pcomboGap[i]->Create (WS_CHILD | WS_BORDER | CBS_NOINTEGRALHEIGHT,
rect, this, IDC_COMBO1 + i);

void CMultiLineComboBox::DrawItem(LPDRAWITEMSTRUCT lpdis) is written and
working.

Any help is appreciated, thanks.

Re: User draw Combobox - MeasureItem doesn't get called!?

Tomasz Sowinski30-May-02 13:01

Tomasz Sowinski

30-May-02 13:01

If your combo located on the dialog box or property page?

Tomasz Sowinski -- http://www.shooltz.com

- It's for protection
- Protection from what? Zee Germans?

Re: User draw Combobox - MeasureItem doesn't get called!?

30-May-02 13:51

I assume you meant "Is."
It's in a class derived from CFormView.

What do you have in mind?

I abandoned using MeasureItem and set sizes in AddString. But I still can't control the total height of the drop down list... Sometimes it displays all entries that are, say, 100 pixels; but sometimes it will cut off the last entry and displayed a total of 80 pixels.

I'd still appreciate it if someone can help me get MeasureItem to be used.

Can someone recommend some on-line MFC documents? This book I'm using doesn't list the specifics.

Components and Controls in VC7

Le centriste30-May-02 6:42

Le centriste

30-May-02 6:42

In VC6, when I wanted to add, for instance, the Microsoft DataGrid Control 6.0 (OLEDB) control, I went to Project | Add to Project | Components and Controls....

I can't find equivalent in VC7. Can you help me?

tx

Michel

It is a lovely language, but it takes a very long time to say anything in it, because we do not say anything in it, unless it is worth taking a very long time to say, and to listen to.

- TreeBeard

Rama Krishna Vavilala30-May-02 7:23

Rama Krishna Vavilala

30-May-02 7:23

1. Select the menu Project->Add Class

2. In the dialog box that appears. Select MFC class From ActiveX control

3. In the next dialog select the ActiveX control you want.

BTW, I don't think using MFC Wrappers around ActiveX controls is a good idea. I much rather recommend using #import the typelibrary.

Mazdak30-May-02 9:20

Mazdak

30-May-02 9:20

Michel Prévost wrote:
Microsoft DataGrid Control 6.0 (OLEDB)

I don't think this component exist in VC7.

Mazy

"The more I search, the more my need
For you,
The more I bless, the more I bleed
For you."The Outlaw Torn-Metallica

Le centriste30-May-02 9:28

Le centriste

30-May-02 9:28

Yes, it does. I followed Rama's instructions and I found it.

Michel

It is a lovely language, but it takes a very long time to say anything in it, because we do not say anything in it, unless it is worth taking a very long time to say, and to listen to.

- TreeBeard

Worker Threads and GetExitCodeThread()

Mazdak30-May-02 21:16

Mazdak

30-May-02 21:16

Michel Prévost wrote:
I followed Rama's instructions and I found it.

But it does not exist in my computer.I don't think its thr part of default installation in VS.Net.

Chris Meech30-May-02 6:36

Chris Meech

30-May-02 6:36

If I am using some code as follows

aThreads[iArrayIndex] = AfxBeginThread(ClientExtractThread, (LPARAM)pExtractor);
...
...
iArrayIndex = WaitForMultipleObjects(MAX_CONCURRENT_THREADS,aThreads,FALSE,INFINITE);
...
...
GetExitCodeThread(aThreads[iArrayIndex]->m_hHandle, &nRetVal);

I'm concerned that the member variable m_bAutoDelete of the CWinThread object created by AfxBeginThread, which defaults to TRUE, will cause the GetExitCodeThread call to not function correctly. Alternatively I can set this member to FALSE, but then I don't know what I have to clean up? Should I just call delete after the GetExitCodeThread has finished.

delete (CWinThread*)aThreads[iArrayIndex];

Thanks for any suggestions.

Chris

Prem Kumar30-May-02 7:11

Prem Kumar

30-May-02 7:11

As you have said you can delete the CWinThread object safely
after you have got the Exit Code.

Chris Meech30-May-02 7:25

Chris Meech

30-May-02 7:25

Thanks Prem.

Tomasz Sowinski30-May-02 13:16

Tomasz Sowinski

30-May-02 13:16

If you set m_bAutoDelete to TRUE, your thread will delete yourself. The value of 'aThreads[iArrayIndex]' in GetExitCodeThread call points to freed memory block and there's absolutely no guarantee that m_Handle contains valid value.

In short, you shouldn't use m_bAutoDelete --or-- you should store thread handles in other location.

Tomasz Sowinski -- http://www.shooltz.com

- It's for protection
- Protection from what? Zee Germans?