Re: Converting CString to char* - C / C++ / MFC Discussion Boards

Re: Converting CString to char*

led mike10-Oct-08 9:09

led mike

10-Oct-08 9:09

Same ocean, different fish, same bait.

You have lunch yet? Poke tongue | ;-P

led mike

Re: Converting CString to char*

Mark Salsbery10-Oct-08 9:16

Mark Salsbery

10-Oct-08 9:16

led mike wrote:
You have lunch yet?

Heh. I'm going to HAVE to now Poke tongue | ;-P

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Converting CString to char*

DSPCottage10-Oct-08 9:21

DSPCottage

10-Oct-08 9:21

Thanks
It was great

Re: Converting CString to char*

DSPCottage10-Oct-08 9:39

DSPCottage

10-Oct-08 9:39

But it appears that VC2005 doesn't support (LPSTR) or (LPCTSTR) operator.
isn't it?
Regards

Re: Converting CString to char*

Cedric Moonen10-Oct-08 9:44

Cedric Moonen

10-Oct-08 9:44

Yes, it is simply because UNICODE is defined by default (which was not the case with VC6). I strongly suggest that you read the article given by Led Mike, things will be much more clear afterwards.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: Converting CString to char*

Mark Salsbery10-Oct-08 9:49

Mark Salsbery

10-Oct-08 9:49

The operator is a member of the CSimpleStringT class, which is the base
class of CStringT.

The actual operator is PCXSTR (the ATL type), which is the equivalent of LPCTSTR
(a Win32 type).

Here's your code using generic text types:

TCHAR buffer[MAX_PATH];
GetModuleFileName(NULL,buffer,MAX_PATH);
CString path = buffer;
path = path.Left(path.ReverseFind(_T('\\'))+1);
path += _T("result.mp3");
f = _tfopen( path , _T("wb"));  <code>// <-- implicitly uses CString's PCXSTR operator!</code>

See Generic-Text Mappings in Tchar.h[^]
and for Unicode info: International Programming[^]

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Converting CString to char*

Cedric Moonen10-Oct-08 9:34

Cedric Moonen

10-Oct-08 9:34

Read the documentation about CString::GetBuffer and you will see why you have to absolutely avoids it if you don't know exactly what you are doing.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: Converting CString to char*

DSPCottage10-Oct-08 9:37

DSPCottage

10-Oct-08 9:37

Visual C++ 2005 doesn't support (LPCTSTR) cast operator.
thus I need an interface to change a CString object to a char*
exactly now I am porting an project from VC6 to VC2005 and it is my problem
Regards
Mahdi

Re: Converting CString to char*

zafersavas10-Oct-08 8:25

zafersavas

10-Oct-08 8:25

There a various ways:
1)

CString str = "filename";

char charPtr[100];
sprintf(charPtr, "%s", str);

CString str = "filename";
char* charPtr = str.GetBuffer(str.GetLength());

Re: Converting CString to char*

super_ttd11-Oct-08 4:28

super_ttd

11-Oct-08 4:28

zafersavas wrote:
str.GetBuffer(str.GetLength());

Memory Leak here !

Why the hell do people use that dangerous GetBuffer() function when it's absolutely useless ? D'Oh! | :doh:

Re: Converting CString to char*

led mike10-Oct-08 8:52

led mike

10-Oct-08 8:52

Gut Mikh Tappe wrote:
Please let me know what to do

Ok I will try. What you need to do is read the documentation.[^]

Also reading this might help as well.[^]

In my experience not all authors match every reader. So if you find reading those sources don't supply your need 100% keep looking for more. The bottom line is what you need to do is read and study rather than type code and forum messages.

led mike

Re: Converting CString to char*

Cedric Moonen10-Oct-08 9:42

Cedric Moonen

10-Oct-08 9:42

led mike wrote:
Also reading this might help as well.[^]

I think that is the best choice to start with Smile | :)

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: Converting CString to char*

Mark Salsbery10-Oct-08 9:53

Mark Salsbery

10-Oct-08 9:53

led mike wrote:
Also reading this might help as well.[^]

That IS a good link. I bookmarked that to post in the future,

Thanks! Beer | [beer]

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Converting CString to char*

Mark Salsbery10-Oct-08 9:12

Mark Salsbery

10-Oct-08 9:12

In addition to super_ttd's reply...

If you must use fopen(), then you should probably use a CStringA.

CString has a generic internal character type, depending on whether
UNICODE or _UNICODE is defined.

If you want to use the generic text CString, then it will pair nicely
with the generic text version of fopen(), which is _tfopen().

Gut Mikh Tappe wrote:
char buffer[MAX_PATH];
GetModuleFileName(NULL,(LPWCH)buffer,MAX_PATH);

Bad cast!! GetModuleFileName takes a LPTSTR as its second parameter.
Your buffer, therefore, should be a TCHAR type, not char.

Mind your types.....if you need a cast to get something to compile, look at WHY.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Converting CString to char*

DSPCottage10-Oct-08 9:40

DSPCottage

10-Oct-08 9:40

May you please give me an article about UNICODE ?
Regards
Mahdi

Re: Converting CString to char*

Rick York10-Oct-08 12:30

Rick York

10-Oct-08 12:30

Here are a few : http://www.google.com/search?hl=en&q=UNICODE&btnG=Google+Search[^]

CStatic with a scrollbar

MrNyquist10-Oct-08 7:33

MrNyquist

10-Oct-08 7:33

Hello all together!
In my current project i am trying to add a scrollbar to a CStatic control. This CStatic control is placed dynamicaly on a CWnd using Create(...). The scrollbar is provided with the CScrollHelper class and the scrollbars are already visible. My problem is that the scrollbars can not be used...i think the events are not passed to the CStatic...
Has anyone an idea how to do it?

Re: CStatic with a scrollbar

led mike10-Oct-08 8:57

led mike

10-Oct-08 8:57

MrNyquist wrote:
Hello all together!

Hello singularly!

MrNyquist wrote:
Has anyone an idea how to do it?

Looks like this guy might.[^] Notice there is a forum at the bottom of the article for asking questions about using CScrollHelper

led mike

Re: CStatic with a scrollbar

MrNyquist10-Oct-08 22:12

MrNyquist

10-Oct-08 22:12

ok, i know this article and the forum at the bottom ...
but i did not find an approach for my problem. (scrolbars are not accessible on a static control)

Re: CStatic with a scrollbar

Hamid_RT11-Oct-08 19:13

Hamid_RT

11-Oct-08 19:13

See A static control with scrolling text[^].

Problem with custom controls in dialog bar

ilgale10-Oct-08 6:11

ilgale

10-Oct-08 6:11

I've implemented a custum control deriving a class from CStatic
and performing a custom drawing.
This controls works fine when I put it in a Dialog (calling
Mycontrol.Invalidate() - in MyDialog class - causes control redrawing).

If I put the same control in a DialogBar calling
Mycontrol.Invalidate() doesn't causes control redrawing, I've to
call MyDialog.Invalidate(): in this way the whole DialogBar
is redrawn and Mycontrol is redrawn within it.

Whats is this different behaviour due to ?

Thanks

Re: Problem with custom controls in dialog bar

Ștefan-Mihai MOGA10-Oct-08 21:21

Ștefan-Mihai MOGA

10-Oct-08 21:21

Hi, please try calling UpdateWindow after Invalidate. It should work in both cases.

Best regards,
Mihai Moga

Set BAckground Picture

Davitor10-Oct-08 2:52

Davitor

10-Oct-08 2:52

Hi All

How can i set background image on dailob box and button in vc++ 2005?Plz help me

Re: Set BAckground Picture

_AnsHUMAN_ 10-Oct-08 3:01

_AnsHUMAN_

10-Oct-08 3:01

Dialog Background[^] and Bitmap Button[^]

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: Set BAckground Picture

Roger Stoltz10-Oct-08 3:04

Roger Stoltz

10-Oct-08 3:04

Davitor wrote:
How can i set background image on dailob box and button in vc++ 2005?

At the top of my head two ways comes to mind:
1. override OnDraw() and draw the image youself
2. create a picture control behind the other controls in the dialog

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

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