Re: Scrolling Woes. - ATL / WTL / STL Discussion Boards

Monty²29-Jul-06 21:36

29-Jul-06 21:36

USES_CONVERSION;
CComBSTR *pBString;
...
...
char *pString = OLE2T(pBString);

This should work. Unsure | :~

The original point and click interface was a Smith & Wesson.

Re: How to CComBSTR convert to char *?

Jörgen Sigvardsson30-Jul-06 9:21

Jörgen Sigvardsson

30-Jul-06 9:21

You're far better off with CW2A() et al (ATL7 and later). USES_CONVERSION is a biiiiiiig cludge. (Take a peek under the hood, and you'll see...)

--
Mr. Bender's Wardrobe by ROBOTANY 500

Re: How to CComBSTR convert to char *?

Michael Dunn29-Jul-06 23:24

Michael Dunn

29-Jul-06 23:24

The Complete Guide to C++ Strings, Part II - String Wrapper Classes[^]

--Mike--
Visual C++ MVP Cool | :cool:

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Re: How to CComBSTR convert to char *?

Zac Howland31-Jul-06 8:37

Zac Howland

31-Jul-06 8:37

Do you have to use CComBSTR? If not, why are you using it? _bstr_t is a much more complete wrapper for BSTRs.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Re: How to CComBSTR convert to char *?

Jörgen Sigvardsson1-Aug-06 12:27

Jörgen Sigvardsson

1-Aug-06 12:27

If you want to eliminate CRT dependencies, CComBSTR is the way to go.

--
Broadcast simultaneously one year in the future

Scrolling Woes.

HakunaMatada28-Jul-06 23:21

HakunaMatada

28-Jul-06 23:21

I have created a Child Window with its style set to WS_VSCROLL. This child window houses some CEdit and CStatic Windows. Now I have set up the Vertical Scroll bar, but when I scroll the child Window, the controls on it do not get repainted properly. Can anyone explain why?

I am using WTL 7.1. Thanks.

---

Hakuna-Matada Beer | [beer]

It means no worries for the rest of your days...
It's our problem free, Philosophy
<marquee behavior="alternate" scrollamount="5" scrolldelay="50"> Jig | [Dance]

Re: Scrolling Woes.

Monty²29-Jul-06 21:38

Monty²

29-Jul-06 21:38

Did you try to set clipchildrens style bit (forgot the actual name), if that doesn't work try calling UpdateWindow for all the controls after scrolling.

My sins are bloody red, my coffee is a black hole.

Re: Scrolling Woes.

HakunaMatada30-Jul-06 18:40

HakunaMatada

30-Jul-06 18:40

Thank You for taking the time to reply to my woe. Well, I have set the WS_CLIPCHILDREN and WS_CLIPSIBLINGS styles to my control and UpdateWindow() also doesn't work. In the End, I tried Invalidate on all the child controls and it worked. although the scrolling is not smooth as expected, but it scrolls. Any other way that I can make the scrolling experience better?

Thank You once again.

---

Hakuna-Matada Beer | [beer]

It means no worries for the rest of your days...
It's our problem free, Philosophy
<marquee behavior="alternate" scrollamount="5" scrolldelay="50"> Jig | [Dance]

About IE 7 Tabs

JaydeepB26-Jul-06 21:46

JaydeepB

26-Jul-06 21:46

how to trap tab change event in IE7 or how to get active tab ?

Re: About IE 7 Tabs

JaydeepB27-Jul-06 21:25

JaydeepB

27-Jul-06 21:25

i found the way to get tab change event and get the active tab.

Re: About IE 7 Tabs

HunterNet19-Aug-06 5:16

HunterNet

19-Aug-06 5:16

Would you mind sharing it with us?

CoCreateInstance() return E_OUTOFMEMORY

chenxiujie26-Jul-06 19:43

chenxiujie

26-Jul-06 19:43

Hello,
I create a COM componet with ATL, but when I test it , by CoCreateInstance(),
the result value is always E_OUTOFMEMORY, who can tell me why? Thanks a lot!

Re: CoCreateInstance() return E_OUTOFMEMORY

Anonymuos28-Jul-06 12:06

Anonymuos

28-Jul-06 12:06

chenxiujie wrote:
I create a COM componet with ATL, but when I test it , by CoCreateInstance(),
the result value is always E_OUTOFMEMORY

Search the Support Knowledge Base[^]

How to convert *string to _bstr_t and *BSTR

agarunk26-Jul-06 4:38

agarunk

26-Jul-06 4:38

Hi,
I'm creating dll using VS2005 ATL project. I'm using third party SDK API's which extracts data into a *string variable. Now I'm facing problem with converting the *string to _bstr_t and *BSTR.

Please guide me whether is it possible to convert *string to _bstr_t and *BSTR, if so how to do it. If possible with a sample piece of code.

thanking you,
Arun

Re: How to convert *string to _bstr_t and *BSTR

Lim Bio Liong27-Jul-06 8:00

Lim Bio Liong

27-Jul-06 8:00

Hello agarunk,

By "*string", do you mean a pointer to a STL string ?

By "*BSTR", do you mean a pointer to a BSTR ?

- Bio.

Re: How to convert *string to _bstr_t and *BSTR

agarunk27-Jul-06 19:43

agarunk

27-Jul-06 19:43

Hi Bio,

Its "std::string*", i.e., pointer to std string.
and yes "BSTR*" is pointer to a BSTR.

-Arun

Re: How to convert *string to _bstr_t and *BSTR

Steve S27-Jul-06 21:55

Steve S

27-Jul-06 21:55

Both the _bstr_t wrapper class and BSTR expect the text to be UNICODE, rather than ANSI or MBCS. While _bstr_t can convert from LPCSTR, BSTR on it's own can't.

You will need to use the c_str() member function of the std::string to get your LPCSTR in the first place (unlike MFC/ATL/WTL CString class, there's no LPCTSTR operator). Like I say, you can then use this pointer with something like A2W or MultiByteToWideChar.

Steve S
Developer for hire

Re: How to convert *string to _bstr_t and *BSTR

agarunk27-Jul-06 22:07

agarunk

27-Jul-06 22:07

Hi Steve,
Below is the implementation which I'm using now....

BSTR* TargetBSTR ;<br />
string *SourceStr=new string;<br />
string StrBuff;<br />
const char *CharBuff;<br />
<br />
StrBuff=*SourceStr;<br />
CharBuff=StrBuff.c_str();<br />
*TargetBSTR = _com_util::ConvertStringToBSTR(CharBuff);

Is this what you are asking me to do???
It is working fine for me for time being... I would like to know if I'm doing any mistake.
Is there any issues with it???

-Arun

Re: How to convert *string to _bstr_t and *BSTR

Zac Howland28-Jul-06 10:01

Zac Howland

28-Jul-06 10:01

agarunk wrote:
BSTR* TargetBSTR ;
string *SourceStr=new string;
string StrBuff;
const char *CharBuff;

StrBuff=*SourceStr;
CharBuff=StrBuff.c_str();
*TargetBSTR = _com_util::ConvertStringToBSTR(CharBuff);

That is far more code than you need to do for this. See my response below.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Re: How to convert *string to _bstr_t and *BSTR

Zac Howland28-Jul-06 9:59

Zac Howland

28-Jul-06 9:59

Steve S wrote:
Both the _bstr_t wrapper class and BSTR expect the text to be UNICODE, rather than ANSI or MBCS. While _bstr_t can convert from LPCSTR, BSTR on it's own can't.

This isn't completely accurate. _bstr_t has a constructor that takes a const char*. It will do the conversion for you.

Basically, if you need to convert std::string* to a _bstr_t* (or even to a BSTR*), here is a simple way to do it:

std::string* pStlString = new string("my stuff");
_bstr_t* pBstrWrapper = new _bstr_t(pStlString->c_str());
BSTR* pBstr = pBstrWrapper->GetAddress();

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Re: How to convert *string to _bstr_t and *BSTR

Steve S2-Aug-06 3:57

Steve S

2-Aug-06 3:57

I sit corrected Smile | :)

I confess that these days I very rarely use ANSI/MBCS, since I no longer do stuff for Win9x/ME platforms. Lucky me, my end-customers all use W2K or later...

Steve S
Developer for hire

Re: How to convert *string to _bstr_t and *BSTR

Zac Howland2-Aug-06 4:22

Zac Howland

2-Aug-06 4:22

Since I'm in the Linux world at my new job, I'm a bit rusty myself. I do find that using the T-functions (along with classes that can use both char* and wchar_t*) alleviates much of those headaches.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Re: How to convert *string to _bstr_t and *BSTR

Michael Dunn28-Jul-06 6:22

Michael Dunn

28-Jul-06 6:22

Check out The Complete Guide to C++ Strings, Part II - String Wrapper Classes[^]

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Returning Class Pointer From ATL component.. [modified]

Mahesh Kulkarni24-Jul-06 2:29

Mahesh Kulkarni

24-Jul-06 2:29

Hi All,

I want to return a Class pointer from ATL Dll.Currently I am trying method using IDispatch * but giving problem, return pointer is invalid . Please give me a solution for this.

Thanks in Advance.

The secret of life is not enjoyment
but education through experience.
- Swami Vivekananda.

-- modified at 8:30 Monday 24th July, 2006

Re: Returning Class Pointer From ATL component.

Stephen Hewitt24-Jul-06 23:50

Stephen Hewitt

24-Jul-06 23:50

You don't return class pointers in COM: It violates the whole concept of COM. COM components are meant to be (programming) language neutral so you can't be returning classes from COM objects: What good is a C++ class to VB, for example? Can you be more specific with what (exactly) you're trying to achieve?

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