C / C++ / MFC Discussion Boards

Zizilamoroso5-Sep-02 21:43

5-Sep-02 21:43

I've created an mfc-dll and everything works fine when invoked on my computer.

When we try it on another one, it fails and says that it can't find things like MFC...d.dll. I guess the d stands for dutch.

How can I compile and link that dll so it doesn't use those other anymore?

And another question: If we put the dll in the windows/system -directory, do we still have to provide the path to it when trying to load?

[VISUAL STUDIO 6.0] [MFC] [WIN98/2]

Bluute tette! Dead | X|

Re: dll without language

Nish Nishant5-Sep-02 21:52

Nish Nishant

5-Sep-02 21:52

Grote Smurf (aka frisco) wrote:
When we try it on another one, it fails and says that it can't find things like MFC...d.dll. I guess the d stands for dutch.

The 'd' stands for debug.
You must distribute release builds and not debug builds.

Grote Smurf (aka frisco) wrote:
How can I compile and link that dll so it doesn't use those other anymore?

You can build it statically. Usually most people have the release MFC DLLs, but just in case...

Grote Smurf (aka frisco) wrote:
And another question: If we put the dll in the windows/system -directory, do we still have to provide the path to it when trying to load?

Nope, you don't have to!

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: dll without language

Zizilamoroso5-Sep-02 22:21

Zizilamoroso

5-Sep-02 22:21

Verry quick response! Thanks Smile | :)

[VISUAL STUDIO 6.0] [MFC] [WIN98/2]

Bluute tette! Dead | X|

Quesion about Trim and Mmap operations of memory.

George Ma5-Sep-02 20:03

George Ma

5-Sep-02 20:03

Hi, everyone!

I have read some source codes about Trim and Mmap operation
of memory. But I still do not understand what means Trim and
Mmap opeartions of memory. Where can I find docuemnts about
details on what means Trim and Mmap?

Cheers,
George

Re: Quesion about Trim and Mmap operations of memory.

Christian Graus5-Sep-02 20:19

Christian Graus

5-Sep-02 20:19

I'm lost - neither of these are C++ keywords as far as I know. trim presumably trims, for example, a string to be a subset of what it was, but what does mmap stand for ? A multimap is an STL container, but I doubt that is what you're after.

Christian

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002

Re: Quesion about Trim and Mmap operations of memory.

George Ma5-Sep-02 21:38

George Ma

5-Sep-02 21:38

Hi, Christian pal!

I am reading the source codes of a project that
deals with memory management. It can run both
on Windows and Linux. I just know that the two
functions are used to release unused memory back
to the system. But I do not know the details. Frown | :-(

Do you know where can I find detailed document about
the two functions?

Have a nice day,
George

CWnd based class problem

Anonymous5-Sep-02 19:33

Anonymous

5-Sep-02 19:33

I implemented a base class CMyViewBase, there's a function CreateMyChild(xxxxx ... ) which has to put in a CWnd * as the parent.

However, it can only be known in the derived class only, such that my classes are derived from CTabCtrl, CView also. How can a child know that ??

Can my derived class using "virtual" CMyViewBase in declare inheritance, and my base class using public CWnd ?

I dont know...

Coremn5-Sep-02 19:27

Coremn

5-Sep-02 19:27

Sorry about this, does anyone know what the following code does

<br />
<br />
DWORD Thing::GetDiviceFreeSpace(LPCTSTR lpszPath)<br />
{<br />
        struct statfs sStats;<br />
        if(statfs(lpszPath,&sStats)== -1)<br />
                return 0;<br />
        return sStats.f_bsize * sStats.f_bavail;<br />
<br />
}<br />

I found it in some project I am working on, confusing

---
Why are all the good signitures taken already? Roll eyes | :rolleyes:

Re: I dont know...

Christian Graus5-Sep-02 20:17

Christian Graus

5-Sep-02 20:17

You need to know what the struct is in order to know what it does. the statfs struct must be defined somewhere else for this to do anything. Search MSDN, if it's not there, search your code.

Christian

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002

Re: I dont know...

markkuk5-Sep-02 23:03

markkuk

5-Sep-02 23:03

Is the code from an Unix/Linux program? statfs() appears to be a Linux or BSD Unix syscall, on Linux the documentation says:

       int statfs(const char *path, struct statfs *buf);
       int fstatfs(int fd, struct statfs *buf);

DESCRIPTION
       statfs  returns  information  about a mounted file system.  path is the
       path name of any file within the mounted filesystem.  buf is a  pointer
       to a statfs structure defined as follows:

              struct statfs {
                 long    f_type;     /* type of filesystem (see below) */
                 long    f_bsize;    /* optimal transfer block size */
                 long    f_blocks;   /* total data blocks in file system */
                 long    f_bfree;    /* free blocks in fs */
                 long    f_bavail;   /* free blocks avail to non-superuser */
                 long    f_files;    /* total file nodes in file system */
                 long    f_ffree;    /* free file nodes in fs */
                 fsid_t  f_fsid;     /* file system id */
                 long    f_namelen;  /* maximum length of filenames */
                 long    f_spare[6]; /* spare for later */
              };

Re: I dont know...

jhwurmbach5-Sep-02 20:15

jhwurmbach

5-Sep-02 20:15

Coremn wrote:
Sorry about this, does anyone know what the following code does

DWORD Thing::GetDiviceFreeSpace(LPCTSTR lpszPath)<br />

may very well get a devices free space.
statfs() sounds very much like "STATatus of FileSystem", so this would also fit in.
Third, a search in MSDN showed statfs() to be a "NFS Version 2 RPC Call", the description being 'Get file system attributes'.

Hope this helped

PS. I charge you 30 Dollar for information retrieval service. Poke tongue | ;-P

Re: I dont know...

Coremn5-Sep-02 20:56

Coremn

5-Sep-02 20:56

Thanks dudes - it will help
The cheque is in the mail. Smile | :)

---

How to access C++ Lib by using Java?

blongtq5-Sep-02 19:00

blongtq

5-Sep-02 19:00

Hello all,
Is there anyway to access C++ Library by using Java (Pure Java)? If yes, please give me some instructions.
Thank you very much.
Long Truong

Re: How to access C++ Lib by using Java?

Stephane Rodriguez.5-Sep-02 21:17

Stephane Rodriguez.

5-Sep-02 21:17

Aren't you a little bit offtopic here ?

Try this one.

God luck,

And I swallow a small raisin.

I doubt in CRichEditCtrl

sonshiro5-Sep-02 18:52

sonshiro

5-Sep-02 18:52

I know that CRichEditCtrl::SetSel(0,-1) will select all text in richedit control. But I don't understand about GetSel(). When I call CRichEditCtrl::GetSel(nStart, nEnd) to get selection range (after I called CRichEditCtrl::SetSel(0,-1)). Why the range is greater than text length.
Example:
- current text is "Hello". (text length = 5)
- then I call CRichEditCtrl::SetSel(0,-1).
- and then I call CRichEditCtrl::GetSel(nStart, nEnd).
- the result is nStart=0 and nEnd=7.
?? Why nEnd is not equal 5? What is the two addition?

Re: I doubt in CRichEditCtrl

.dan.g.5-Sep-02 19:45

.dan.g.

5-Sep-02 19:45

maybe its a 'carriage return\linefeed' pair on the end.

Multithreading

pankajdaga5-Sep-02 17:11

pankajdaga

5-Sep-02 17:11

I have the following encapsulation of a CriticalSection and Lock (out of my school textbook)

class Mutex
{
friend class Lock;
public:
Mutex () { InitializeCriticalSection (& _critSection); }
~Mutex () { DeleteCriticalSection (& _critSection); }
private:
void Acquire ()
{
EnterCriticalSection (& _critSection);
}
void Release ()
{
LeaveCriticalSection (& _critSection);
}

CRITICAL_SECTION _critSection;
};

class Lock
{
public:
// Acquire the state of the semaphore
Lock ( Mutex & mutex )
: _mutex(mutex)
{
_mutex.Acquire();
}
// Release the state of the semaphore
~Lock ()
{
_mutex.Release();
}
private:
Mutex & _mutex;
};

In the mutex class, why is the private member stored by reference? That is the line Mutex & _mutex;

I am asking, coz I used the classes for a school project and missed the &. My program crashed windows and it took me 6 hours to find the missing &! Why is it necessary to store it by reference?

Pankaj

Without struggle, there is no progress

Re: Multithreading

C^hris L^osinger5-Sep-02 18:12

C^hris L^osinger

5-Sep-02 18:12

when you pass an object by value, a copy of the object is created and passed to the function. this object will go out of scope and its destructor will be called, when the function exits.

when you pass by reference, the function uses the original object (via a pointer) and, so the object doesn't go out of scope when the function exits (and the destructor is not called).

a quick glance at your code...

the Mutex destructor deletes the critical section, possibly while some code is using it.

-c

Argue for your limitations, and sure enough, they're yours.

Re: Multithreading

Todd Smith6-Sep-02 18:46

Todd Smith

6-Sep-02 18:46

You should probably add a flag to your Mutex class indicating whether or not the cs has been acquired:

<br />
void Acquire ()<br />
{<br />
    if (!bAcquired) <br />
        EnterCriticalSection (& _critSection);<br />
    else<br />
        assert(!"Something is fishy!");<br />
    bAcquired = true;<br />
}<br />
<br />
void Release ()<br />
{<br />
    if (bAcquired)<br />
        LeaveCriticalSection (& _critSection);<br />
    else<br />
        assert(!"Something is fishy!");<br />
    bAcquired = false;<br />
}<br />

Todd Smith

procompile question

Year5-Sep-02 17:09

Year

5-Sep-02 17:09

Build output message "Build : warning : failed to (or don't know how to) build 'D:\SFS\Debug\NMSV3r1.pch'"

I already configure my project correctly, and rebuild all the project,
but still can't complile my project, why?

thanks.

Re: procompile question

Christian Graus5-Sep-02 17:21

Christian Graus

5-Sep-02 17:21

your pch file should not be part of your project, there is no reason to tell the compiler to try to compile a precompiled header.

Christian

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002

Accessing the Internet

Nay205-Sep-02 16:21

Nay20

5-Sep-02 16:21

How do I access the web with a CButton? Confused | :confused:

Out
Nay20

Re: Accessing the Internet

Jason Henderson5-Sep-02 16:25

Jason Henderson

5-Sep-02 16:25

Huh?

I think you need to be more clear with your question.
Do you want to just open a web page or what?

Jason Henderson
_{start page}
^articles
^{"If you are going through hell, keep going." - Sir Winston Churchill}

CTime and CString

monrobot135-Sep-02 16:02

monrobot13

5-Sep-02 16:02

Does anyone know if there's an easy (or even possible way) to convert a CString object to a CTime object?

Any help would be much appreciated.

Monrobot13

Re: CTime and CString

Jason Henderson5-Sep-02 16:28

Jason Henderson

5-Sep-02 16:28

Use COleDateTime::ParseDateTime() then construct a CTime using the hours, minutes, and seconds.

Jason Henderson
_{start page}
^articles
^{"If you are going through hell, keep going." - Sir Winston Churchill}

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