C / C++ / MFC Discussion Boards

karnal3-Oct-05 19:42

3-Oct-05 19:42

hey...
i am wrirtng data to a text file...including large values like 3000000...how to write these values to a file in form of exponents
thanks

karnal

Re: Exponents

Jose Lamas Rios3-Oct-05 21:02

Jose Lamas Rios

3-Oct-05 21:02

Use printf with e, E, g, or G as the type field[^]

--
jlr
http://jlamas.blogspot.com/[^]

Re: Exponents

dima_kdl4-Oct-05 1:45

dima_kdl

4-Oct-05 1:45

FILE *f;
f = fopen("1.txt", "w");
if( f )
{
float fNumber= 3000000.0f;
fprintf( f, "%e", fNumber );
fclose( f );
}

c++;

how do i typecast a CString to TCHAR type?

Anonymous3-Oct-05 19:30

Anonymous

3-Oct-05 19:30

how do i typecast a CString to TCHAR type?

Re: how do i typecast a CString to TCHAR type?

ThatsAlok3-Oct-05 19:39

ThatsAlok

3-Oct-05 19:39

Anonymous wrote:
how do i typecast a CString to TCHAR type?

there are many ways:-
#1 By TypeCast
(LPSTR)(LPCTSTR)CString Variable //return Char*
#2 By Using GetBuffer()..
CStringVar::GetBuffer() //return Char*
..............
Do your Work
..............
CStringVar::RelaseBuffer()

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Re: how do i typecast a CString to TCHAR type?

Anonymous3-Oct-05 20:04

Anonymous

3-Oct-05 20:04

i dont think the first one works!?
u see,
here is my code:
strcpy((char *)cFilePath, ( LPCSTR )( LPCTSTR )RawFile.GetPathName() ) ;

where cFilePath is TCHAR type

anyideas?

Re: how do i typecast a CString to TCHAR type?

Anonymous3-Oct-05 20:19

Anonymous

3-Oct-05 20:19

i forgot to put up one more point,that is ,
in teh above 'strcpy' does compile,but only the first letter of the whole word gets copied!

the declaration for cFilePath is
TCHAR cFilePath[_MAX_PATH]

Re: how do i typecast a CString to TCHAR type?

Jose Lamas Rios3-Oct-05 20:40

Jose Lamas Rios

3-Oct-05 20:40

TCHAR is a char in ANSI/MBCS but wchar_t for Unicode. You are probably compiling for a Unicode build. The following would work fine in either configuration (that's what TCHAR macros are for):

// Use TCHAR, LPCTSTR and _tcsncpy instead
// of char/wchar_t, LPCSTR/LPWSTR and strncpy/wcsncpy
// so that the same code compiles both for
// MBCS and Unicode
 
TCHAR cFilePath[_MAX_PATH];
 
// Use _tcsncpy to make sure you don't write past
// the end of the buffer
_tcsncpy(cFilePath, (LPCTSTR) RawFile.GetPathName(), _MAX_PATH);
 
// Then make sure the buffer gets NULL terminated
cFilePath[_MAX_PATH-1] = _T('\0');

--
jlr
http://jlamas.blogspot.com/[^]

Re: how do i typecast a CString to TCHAR type?

Anonymous3-Oct-05 22:17

Anonymous

3-Oct-05 22:17

thank u sir .....
brilliant!!!!!
Smile | :)

Re: how do i typecast a CString to TCHAR type?

Lane Yu4-Oct-05 3:59

Lane Yu

4-Oct-05 3:59

ThatsAlok wrote:
#1 By TypeCast
(LPSTR)(LPCTSTR)CString Variable //return Char*

This way is only for a const TCHAR*. That is, this address can only be read. It's not safe to write.

ThatsAlok wrote:
#2 By Using GetBuffer()..
CStringVar::GetBuffer() //return Char*
..............
Do your Work
..............
CStringVar::RelaseBuffer()

This is the standard way to get the address of the buffer. You should pass a max length for the buffer in GetBuffer(), and then the pointer can be written.

Re: how do i typecast a CString to TCHAR type?

Jose Lamas Rios3-Oct-05 20:29

Jose Lamas Rios

3-Oct-05 20:29

If you mean LPCTSTR or const TCHAR* (i.e., a pointer to a read-only string of TCHARs):

CString sText = _T("This is a test");
LPCTSTR p = sText;

If you mean LPTSTR or TCHAR* (i.e., a pointer to a string of TCHARs that you are allowed to modify):

CString sText = _T("This is a test");
LPTSTR p = sText.GetBuffer();
_tcscpy(p, _T("end of test");
sText.ReleaseBuffer(-1);

--
jlr
http://jlamas.blogspot.com/[^]

how to clear browse info

Anonymous3-Oct-05 18:30

Anonymous

3-Oct-05 18:30

I use VS6. As I type in an object variable, VS6 provides me with a list of member variables and functions for autocompletion. But this list is outdated and doesnt take into account any new items added to the class. Is there any way to fix this?

Re: how to clear browse info

ThatsAlok3-Oct-05 19:18

ThatsAlok

3-Oct-05 19:18

Anonymous wrote:
Is there any way to fix this?

delete project.bsc file from you DEBUG and RELEASE folder

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Re: how to clear browse info

Prakash Nadar3-Oct-05 22:15

Prakash Nadar

3-Oct-05 22:15

full rebuild can help.

-prakash

Using GDI+ in View

The NULL Developer3-Oct-05 18:23

The NULL Developer

3-Oct-05 18:23

i'm using the following code in my SDI application:

void CMyView::OnDraw(CDC* /*pDC*/)
{
	CMyDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	if (!pDoc)
		return;

	// TODO: add draw code for native data here
	Graphics    graphics(m_hWnd);
	SolidBrush  brush(Color(255, 0, 0, 0));
	FontFamily  fontFamily(L"Times New Roman");
	Font        font(&fontFamily, 20, FontStyleRegular, UnitPixel);
	RectF		rectF(0.0f, 5.0f, 140.0f, 40.0f);
	StringFormat stringFormat;

	stringFormat.SetAlignment(StringAlignmentCenter);
	graphics.SetSmoothingMode(SmoothingModeAntiAlias);
	
	graphics.DrawString(L"Text", -1, &font, rectF, &stringFormat, &brush);
}

but when i run the application, the following message is displayed and application does not contiues furter:

Unhandled exception at 0x7c918fea in Dxf.exe: 0xC0000005: Access violation writing location 0x00000010.

the above code works fine for dialog classes. what might possibly be wrong?

Do first things first, and second things not at all. —Peter Drucker.

Re: Using GDI+ in View

The NULL Developer3-Oct-05 20:59

The NULL Developer

3-Oct-05 20:59

Alright, I got the solution.

I was being stupid...now dont ask me more...

"Do first things first, and second things not at all."
— Peter Drucker.

Re: Using GDI+ in View

Prakash Nadar3-Oct-05 22:55

Prakash Nadar

3-Oct-05 22:55

It would be nice if you post the solution too. I Suspect the constant string that you provided to the funtion, not sure if thats rite.

-prakash

Re: Using GDI+ in View

The NULL Developer3-Oct-05 23:20

The NULL Developer

3-Oct-05 23:20

Well..if you say so...

I was wrongly calling GdiplusShutdown(m_gdiplusToken) here:

BOOL CMyApp::InitInstance()
{
...

// The one and only window has been initialized, so show and update it
	m_pMainWnd->ShowWindow(SW_SHOW);
	m_pMainWnd->UpdateWindow();
	// call DragAcceptFiles only if there's a suffix
	//  In an SDI app, this should occur after ProcessShellCommand
	GdiplusShutdown(m_gdiplusToken);

	return TRUE;
}

instead of here:

int CMyApp::ExitInstance()
{
	// TODO: Add your specialized code here and/or call the base class
	GdiplusShutdown(m_gdiplusToken);

	return CWinApp::ExitInstance();
}

"Do first things first, and second things not at all."
— Peter Drucker.

Accessing the Store procedure in c++

Anonymous3-Oct-05 17:15

Anonymous

3-Oct-05 17:15

Hi,
I want to access sql store procedure.It has 3 input parameter and 8 output parameters. store procedure also retun the result set. Can you please give me reference of sample code to access store procedure. I am totally new to DB.

Thanks

Pocket PC emulator

fjlv20053-Oct-05 15:58

fjlv2005

3-Oct-05 15:58

Good day,

Im posting this up here bec. there is not much interaction on Embedded/Mobile section but here on Visual C++ a lot of good people come.

Anyway,I'm using Embedded Visual C++ 3.0 on my development. I'am given so LITTLE TIME to do my task, so I'm planning to bring my task at home. Unfurtunately my pc at home is stand-along(doesnt have network -thou I have network card but can't afford yet to have an internet con.). I wanted to run the emulator(Pocket PC 2002) at home but the protocol used is TCP/IP. My Emulator cant connect to the Platform manager do I cant transfer files and debug my program. I've search here in the office on how to connect emulator with active sync (see site below).
.(http://msdn.microsoft.com/library/default.asp?url=/library/en-us/devguidesp/html/sp_intro_to_the_ce_emulator_zjht.asp)
However, I dont have that null modem cable nor serial cable at home. Can anybody help me how I could communicate my emulator with EVC3.0? Cry | :((

Any suggestion would be a great Help.

Thanks

Re: Pocket PC emulator

Ghasrfakhri3-Oct-05 21:12

Ghasrfakhri

3-Oct-05 21:12

I have no experience in Mobile programming, but if you need network connection you can install Microsoft Loopback driver.
it work like a NIC.

Iman Ghasrfakhri

Re: Pocket PC emulator

fjlv20054-Oct-05 15:29

fjlv2005

4-Oct-05 15:29

Good day,

I have tried to install MS Loopback and yes I do have network connection, however, when I ran the emulator, EVC3 emulator platform manager could not connect.
Anyway thanks Iman, I've learn something.

have a nice day.

Simplifying debug traces in the Output window

srev3-Oct-05 14:07

srev

3-Oct-05 14:07

Hi,

I know it's bad practice to disable warnings but I'm fighting my way through lines and lines of irrelevant information in the Output window to find my TRACE output.

Is it possible to temporarily switch off DLL loading messages such as:
'XYZ.exe': Loaded 'C:\WINDOWS\system32\abcdefg.dll', No symbols loaded.

Thanks,

Simon

Re: Simplifying debug traces in the Output window

David Crow4-Oct-05 3:18

David Crow

4-Oct-05 3:18

I preface my debug statements with asterisks, something like:

***** This is my debug message

That way it stands out above all the other noise.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

ActiveX and NM_CUSTOMDRAW

levaey3-Oct-05 12:50

levaey

3-Oct-05 12:50

I have an ATL Composite Control (DLL) that that includes my own control (CMySlider) derived from CSliderCtrl.

Here is the message map of this control.
BEGIN_MESSAGE_MAP(CMySlider, CSliderCtrl)
//{{AFX_MSG_MAP(CPlayerSlider)
ON_NOTIFY_REFLECT(NM_CUSTOMDRAW, OnCustomdraw)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

When Composite Control is embedded in the Dialog or FormView, CMyControl receives notification, OnCustomdraw gets called and everything draws/works perfectly.

The problem is that when the Composite Control is embedded in HTML page, I’m not receiving notification at all and instead of custom slider I’m getting the standard windows control.
Does anybody know what should I do to make it work on the web page?
Any help would be greatly appreciated.

Thanks,
Lev

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