Re: class std::basic_ofstream errors - C / C++ / MFC Discussion Boards

Re: non XP visual style when using chtmlview in VC6/VC7 ??

karmafx10-Mar-04 21:45

karmafx

10-Mar-04 21:45

Thanks Neville,

for some reason your post didn't appear until after I posted mine Smile | :)

But thanks for the tip!! It works great.... However I'm still thinking this isn't
the "correct" way of solving it since I cannot browse internet pages that
dont contain that line (e.g. www.google.com).
But these pages still use visual styles in internet explorer?!
anyway...I dont need it...just curious?! Smile | :)

- KarmaFX

CHange Gradient Colors in WIndow Caption

doctorpi10-Mar-04 7:13

doctorpi

10-Mar-04 7:13

Do you know an easy way to change the caption gradient colors to others programatically?
Do you know an already done class?
Best Regards
Doc

Re: CHange Gradient Colors in WIndow Caption

Robert A. T. Káldy11-Mar-04 1:34

Robert A. T. Káldy

11-Mar-04 1:34

Look at this article.

Robert-Antonio

"Science is a differerntial equation.
Religion is a boundary condition."

FileWriting -> Arrays

nsaddock10-Mar-04 6:02

nsaddock

10-Mar-04 6:02

Greetings:

First time (and most definetly not the last time) posting. I did spend about fifteen minutes trying to find a discussion about this with no luck so here it is:

New to Programming and am using Visual Studio's C++ and Deitel's 'how to program C++ .NET' to learn. I have come to a cross roads, here is my dilema:

I am trying to write a 2D int __gc array[,] to a .txt file. The context is that I have written a simulation (for Diffusion) and need to save the simulation save every nth time steps to a text file (n = 1 == file0001.txt). I have tried multiple techniques with no success, I am not sure if it is best to write a class specifically for saving 2D arrays (where I pass the filename and a pointer to the array), if I need to convert the int array to a string before saving. Like everyone I am under a time line otherwise I would continue to systemattically try new approaches until I was successful. File access has been completely new, with in the last week so even simple calls like how to open and close the file would be appreciated. I am unsure on File::Open or FileMode::OpenOrCreate, FileAcess::Write?? and when to use Serializable versus BinaryFormatter. I hope this is enough information to show my level of competence and issue without over embellishing.

Many thanks
Nick
naddock@hotmail.com

Re: FileWriting -> Arrays

David Crow10-Mar-04 10:06

David Crow

10-Mar-04 10:06

To output the array as one big lump of data, try:

int n2DArray[5][6];
CFile file(..., CFile::modeWrite);
file.Write(n2DArray, sizeof(n2DArray));
file.Close();

Or if you want to output the numbers in a formatted manner, try:

int n2DArray[5][6];
CStdioFile file(..., CFile::modeWrite);
for (int x = 0; x < 5; x++)
{
    for (int y = 0; y < 6; y++)  
    {
        CString str;
        str.Format("%d ", n2DArray[x][y]);
        file.Write(str, str.Length());
    }
}
file.Close();

There's probably a few other ways of doing this, too.

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

class std::basic_ofstream errors

Andrew Hoole10-Mar-04 5:19

Andrew Hoole

10-Mar-04 5:19

Hi

Can anyone help me. I have a large project that I have compiled many times before no problem but today it is suddenly throwing all sorts of errors. They appear to be connected to the standard C++ library. One of the errors is:

error C2678: binary '<<' : no operator defined which takes a left-hand operand of type 'class std::basic_ofstream<char,struct std::char_traits<char=""> >' (or there is no acceptable conversion)

This is thrown on trying to compile the following code

void C3DPoint::Save(ofstream & s)
{
s << x <<" " << y << " " << z << endl;
}

where the header file has the following includes

#include <iostream>
#include <fstream>
using namespace std;

class C3DPoint : public CObject
{
DECLARE_DYNCREATE(C3DPoint)
public:
.
.
.
. int x;
int y;
int z;
.
.
.
};

Does anyone know the reason for these types of errors.

Many thanks in advance for any help.

Andrew Hoole

Re: class std::basic_ofstream errors

Neville Franks10-Mar-04 10:43

Neville Franks

10-Mar-04 10:43

It is very difficult to comment as your code sample isn't showing < >. You should select code you post and use the pre and code and < > Formatting options below the edit area.

Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com

Re: class std::basic_ofstream errors

Andrew Hoole10-Mar-04 22:20

Andrew Hoole

10-Mar-04 22:20

Oops. Sorry about that. Let me try again.

Error message was

error C2678: binary '<<' : no operator defined which takes a left-hand operand of type 'class std::basic_ofstream<char,struct std::char_traits<char> >' (or there is no acceptable conversion)

Thrown by code

void C3DPoint::Save(ofstream & s)
{
s << x <<" " << y << " " << z << endl;
}

With header

#include <iostream>
#include <fstream>
using namespace std;

class C3DPoint : public CObject
{
DECLARE_DYNCREATE(C3DPoint)
public:
.
.
.
.

int x;
int y;
int z;

.
.
.

};

Another error in a different source file is

error C2079: 'file' uses undefined class 'basic_ifstream<char,struct std::char_traits<char> >'

associated with code line

ifstream file(dlg.GetPathName(),ios::in);

Many thanks for any help.

Andrew Hoole

Calling ReadDirectoryChangesW from DLL causes error

Deian10-Mar-04 5:11

Deian

10-Mar-04 5:11

Hello, when calling ReadDirectoryChangesW from a worker thread in DLL I get the following error:
FileMonDlg.cpp(254) : error C2065: 'ReadDirectoryChangesW' : undeclared identifier

Any ideas why this occures?

Thanks.

Re: Calling ReadDirectoryChangesW from DLL causes error

Ravi Bhavnani10-Mar-04 6:17

Ravi Bhavnani

10-Mar-04 6:17

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

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

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

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

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

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

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