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Re: Calling ReadDirectoryChangesW from DLL causes error

Ravi Bhavnani10-Mar-04 6:17

10-Mar-04 6:17

Perhaps a Unicode/MBCS issue? Check your project settings. (It's only available for Unicode builds).

/ravi

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Re: Calling ReadDirectoryChangesW from DLL causes error

Deian10-Mar-04 6:42

Deian

10-Mar-04 6:42

How to set up a unicode build? Blush | :O

Re: Calling ReadDirectoryChangesW from DLL causes error

Ravi Bhavnani10-Mar-04 7:11

Ravi Bhavnani

10-Mar-04 7:11

In VC6, do Projects | Settings | C/C++ | Preprocessor. Select settings for "All configurations". In the "Preprocessor definitions" box, replace _MBCS with _UNICODE. This will likely require you to make your source code Unicode happy (i.e. by using TCHAR, _T and the _t C run time functions). You'll also need to add /entry:"wWinMainCRTStartup" to your linker options for debug and release builds.

If you're confused by all this, please read this[^] introductory article on Unicode first.

/ravi

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Re: Calling ReadDirectoryChangesW from DLL causes error

Nemanja Trifunovic10-Mar-04 7:22

Nemanja Trifunovic

10-Mar-04 7:22

Nope, the problem here is (from MSDN):

Client: Included in Windows XP, Windows 2000 Professional, and Windows NT Workstation 3.51 SP3 and later.
Server: Included in Windows Server 2003, Windows 2000 Server, and Windows NT Server 3.51 SP3 and later.

Look at this entry[^] in M. Dunn's FAQ to see how to resolve this problem.

Re: Calling ReadDirectoryChangesW from DLL causes error

Joel Lucsy10-Mar-04 7:17

Joel Lucsy

10-Mar-04 7:17

Why not try ReadDirectoryChangesA, better yet, let the compiler figure it out and use ReadDirectoryChanges.

--
Joel Lucsy

Re: Calling ReadDirectoryChangesW from DLL causes error

Nemanja Trifunovic10-Mar-04 7:24

Nemanja Trifunovic

10-Mar-04 7:24

Because there is no ReadDirectoryChanges or ReadDirectoryChangesA. Weird, huh? Poke tongue | ;-P

Re: Calling ReadDirectoryChangesW from DLL causes error

Ravi Bhavnani10-Mar-04 7:27

Ravi Bhavnani

10-Mar-04 7:27

Sorry, it's available for Unicode only. Frown | :(

/ravi

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Re: Calling ReadDirectoryChangesW from DLL causes error

Deian10-Mar-04 7:45

Deian

10-Mar-04 7:45

The weird thing is, that after setting the configuration to _UNICODE it still gives this error: undeclared identifier. May be it's something with the DLL?
I'dont have difficulties using this function in dialog based app, but as you can see, I do when I use it in DLL and inside a Thread.

Frown | :(

The answer :)

Deian10-Mar-04 8:01

Deian

10-Mar-04 8:01

The answer to the question is the following line in stdafx.h

#define _WIN32_WINNT 0x400

Thank you all for your attention, time and advices Smile | :)

))

Error at compiling virtual function call in constructor

vgrigor10-Mar-04 4:21

vgrigor

10-Mar-04 4:21

I want to call pure virtual function in constructor
of BASE class,
function will be defined in derived class.

<br />
<br />
class Derived: class Base<Derived><br />
{<br />
   firtual void f()<br />
   {};<br />
}<br />
<br />
template<class T><br />
class Base<br />
{<br />
    Base()<br />
     {<br />
          f();<br />
     };<br />
   firtual void f() =0;<br />
<br />
};<br />

Error at link;

How to correct?

Thanks

Re: Error at compiling virtual function call in constructor

toxcct10-Mar-04 4:25

toxcct

10-Mar-04 4:25

what error does it really give a link-time?

TOXCCT >>> GEII power

Re: Error at compiling virtual function call in constructor

Tomasz Sowinski10-Mar-04 4:45

Tomasz Sowinski

10-Mar-04 4:45

Check this:

http://www.parashift.com/c++-faq-lite/strange-inheritance.html#faq-23.3[^]

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

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Re: Error at compiling virtual function call in constructor

vgrigor10-Mar-04 4:55

vgrigor

10-Mar-04 4:55

as rarely as good reply.

Re: Error at compiling virtual function call in constructor

Nemanja Trifunovic10-Mar-04 6:23

Nemanja Trifunovic

10-Mar-04 6:23

Welcome back, Tomasz Cool | :cool:

Re: Error at compiling virtual function call in constructor

Tomasz Sowinski11-Mar-04 2:47

Tomasz Sowinski

11-Mar-04 2:47

Thanks, Nemanja. I was just passing by and had a look at good ol' VC board Smile | :)

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

InvertRect

Anthony988710-Mar-04 3:50

Anthony9887

10-Mar-04 3:50

Is there a way to change the black highlight to a different colour?

Thanks

BSTR Problem

Nick Parker10-Mar-04 3:34

Nick Parker

10-Mar-04 3:34

I have a function receiving a BSTR within an ATL project. I have placed a break point in the C++ code a added a watch to the incoming variable. When I create an instance of it within VB (don't start) to test it and pass it a directory path, I am only getting the first letter of the string that should be passed in. Any clues?

STDMETHODIMP CMoses::SetArguments(BSTR dir)
{
	AFX_MANAGE_STATE(AfxGetStaticModuleState())
	::AfxMessageBox((LPCTSTR)dir, MB_OK); // for debugging purposes.
	CString val;
	val = (LPCTSTR)dir;
	::AfxMessageBox(val, MB_OK);  // for debugging purposes.
	root.SetArguments(val);
	return S_OK;
}

- Nick Parker
My Blog

Re: BSTR Problem

David Crow10-Mar-04 3:39

David Crow

10-Mar-04 3:39

By default, strings in the Watch window use the ,s symbol. You need to use ,su for Unicode strings. So, if you have a breakpoint in the SetArguments() method, you should have dir,su in the Watch window.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: BSTR Problem

Nick Parker10-Mar-04 3:49

Nick Parker

10-Mar-04 3:49

David, thank you very much. Smile | :)

- Nick Parker
My Blog

Re: BSTR Problem

toxcct10-Mar-04 3:40

toxcct

10-Mar-04 3:40

that's very clear !!

you watch a variable that is a pointer...
what you want from this pointer is to show the string containig the caracters at th folowing addresses, until it encounters a '\0'... that is surely what happened. The second caracter of your string is very certainly a '\0'... watch this !

TOXCCT >>> GEII power

Re: BSTR Problem

Michael Dunn10-Mar-04 4:03

Michael Dunn

10-Mar-04 4:03

Nick Parker wrote:
val = (LPCTSTR)dir;

That's the bug. A BSTR points to a Unicode string, not a TCHAR string. Change it to:

val = (LPCWSTR)dir;

--Mike--
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Re: BSTR Problem

Nick Parker10-Mar-04 4:07

Nick Parker

10-Mar-04 4:07

Thank Mike, I just saw that too. The value has to be passed to a function that accepts a LPCTSTR. Should I expect any problems passing a CString to it instead (i.e.; val being of type CString)?

- Nick Parker
My Blog

Re: BSTR Problem

Prakash Nadar10-Mar-04 5:09

Prakash Nadar

10-Mar-04 5:09

Is it ok to assign BSTR to CString under non UNICODE compilation?

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prakashnadar@msn.com

Re: BSTR Problem

Michael Dunn10-Mar-04 6:35

Michael Dunn

10-Mar-04 6:35

Yes because CString has constructors that take LPCSTR and LPCWSTR.

--Mike--
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Problem when adding two wave files

Member 95034310-Mar-04 3:26

Member 950343

10-Mar-04 3:26

hello!

i wrote a program to combine two wave files into one.
for that i read wave file using CFile class according to
the file format.i am reading samples into vector<int>
variables.i am combininig two vectors and writing to the
file according to the wav format.its playing as three waves.
that i mean each wave as two.

if u know to solve pls help me!

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