Re: Threading - C / C++ / MFC Discussion Boards

Larsson2-Jul-05 6:09

2-Jul-05 6:09

What is wrong with this?, how can I use this to make it work?

CString sDriveLetter= (TCHAR) (i + ('A'));

This is the error I get;

cannot convert from 'TCHAR' to 'ATL::CStringT<basetype,stringtraits>'

Re: TCHAR error?

PJ Arends2-Jul-05 9:38

PJ Arends

2-Jul-05 9:38

What is the error number (C####) that the compiler gave you? If you look up that error number in MSDN you can usually figure out what the problem is by reading the explanation provided.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

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Re: TCHAR error?

Tom Archer2-Jul-05 9:39

Tom Archer

2-Jul-05 9:39

CString sDriveLetter;
sDriveLetter.Format("%c", (TCHAR) (i + ('A')));

Tom Archer
Visual C++ MVP

Re: TCHAR error?

John R. Shaw2-Jul-05 18:19

John R. Shaw

2-Jul-05 18:19

Unless MFC CString class varies from STL, that would be Illegal.

CString sDraveLetter = _T('A'); // illegal

CString sDraveLetter = _T("A"); // ok

CString sDraveLetter;
sDraveLetter = TCHAR(i+_T('A')); // ok

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

Threading

Umair Ahmad khan2-Jul-05 0:53

Umair Ahmad khan

2-Jul-05 0:53

I am having a little problem handling Threads. Problem is, there is a Thread that i want to Terminate when Destructor of a Class called. Thread function is Using some functions of that class. I have done bit reading on Threading(still learning concepts etc) and about terminating a thread the way i want to use is AfxEndThread. it must be called within the thread that has to be terminated. or can it be called outside that thread also. or is there any way to terminate that thread from outside by some other thread.

<br />
pThread = AfxBeginThread(run,&nCount,THREAD_PRIORITY_NORMAL, 0, CREATE_SUSPENDED);<br />
	pThread->m_bAutoDelete=false;<br />
	pThread->ResumeThread();

thats how i am initializing the Thread. Now what if i just delete pThread object will this terminate the thread.
**************************
bit more detail...
above code is placed in the constructor of same class .. now another class when makes object of this class thread should start working and when it delets the object thread must also be end. I am getting some assertion error while some where in terminating the thread. and don't know where

Re: Threading

Umair Ahmad khan2-Jul-05 1:02

Umair Ahmad khan

2-Jul-05 1:02

well the Error I am getting is
Debug Assertion Failed.
File: WinCore.cpp
Line: 1002

well is this problem of my thread. :s

Re: Threading

meinhard_risch2-Jul-05 6:59

meinhard_risch

2-Jul-05 6:59

Hallo, I had a simmilar problem and I solved the problem by using a shared bool var. if the var is set to true from outside the thread terminats its self. Try to use it.

Meinhard

Re: Threading

Umair Ahmad khan2-Jul-05 10:41

Umair Ahmad khan

2-Jul-05 10:41

thanks for your reply well my problem solved the problem was i was trying to access a class function when there was no class object .. i mean with empty pointer Big Grin | :-D

.. and there was one more problem that if i start the thread again before it ends up or the class object is destroyed this create problem because thread is still using the class and class object was deleted .. so i make 2 boolean when destructor call comes one goes to false and destructor goes in an empty loop and this false boolean tell thread ok end now. before thread ends it false the other one too .. to tell destructor ok i m finish now .. so destructor comes out of loop and object destroy. it is something like syncronization .. or what ever Smile | :)

but problem is solved

Re: Threading

David Crow2-Jul-05 12:12

David Crow

2-Jul-05 12:12

See http://flounder.com/workerthreads.htm for how to properly shutdown a thread.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

how to read the header row in excel file?

qqworm2-Jul-05 0:37

qqworm

2-Jul-05 0:37

I am working on an application, in which I need to transfer the data from excel file to the access. but I don't know how to read the header row in excel file, for help, with thanks.

qqwom

Folder Synchronization

M.Mehrdad.M1-Jul-05 22:47

M.Mehrdad.M

1-Jul-05 22:47

Hi, There
I have Problem with the right way that i can Sync. Files
in two folders. i.e. when a file added in one ,a copy will add in other folder.
Folders are in Two compuer Connected with
LAN,
Is there any Sevice, Program, utility, Source code For
This?
Thanks.

Re: Folder Synchronization

David Crow2-Jul-05 12:14

David Crow

2-Jul-05 12:14

Search CP for synchronization-type projects. Google is also a good source.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

drive size

sunit51-Jul-05 21:31

sunit5

1-Jul-05 21:31

pls tell me an API from which i can get the space of each drive and the space left in it.
thanks Smile | :)

Re: drive size

Jack Puppy1-Jul-05 21:44

Jack Puppy

1-Jul-05 21:44

INFO: Understanding and Using GetDiskFreeSpace and GetDiskFreeSpaceEx

Pssst. You see that little light on your monitor? That's actually a government installed spy camera. Smile and wave to big brother!

Re: drive size

sunit51-Jul-05 22:20

sunit5

1-Jul-05 22:20

iReturnValue = ::GetDiskFreeSpaceEx(drives,
(PULARGE_INTEGER)&i64FreeBytesToCaller,
(PULARGE_INTEGER)&i64TotalBytes,
(PULARGE_INTEGER)&i64FreeBytes);

TCHAR *lptotalbyte=NULL;
TCHAR totalbyte[100];
lptotalbyte=_ui64toa(((PULARGE_INTEGER)&i64FreeBytesToCaller)->QuadPart,totalbyte,10);
i used this
in my system it is showing me wrong result
if i try in other sys it is showing 0

Re: drive size

ThatsAlok1-Jul-05 22:54

ThatsAlok

1-Jul-05 22:54

Mr. Sunit,
Use this class :-
http://www.codeproject.com/win32/harddiskspace.asp[^]

or check this article

http://www.codeproject.com/file/ngdiskspacemonitor.asp[^]

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Re: drive size

sunit51-Jul-05 23:07

sunit5

1-Jul-05 23:07

thanx Mr Alok

Re: drive size

Jack Puppy2-Jul-05 0:12

Jack Puppy

2-Jul-05 0:12

Works for me. I get zero if I try it on a CD drive with no CD - GetLastError() returns 21, Device not ready.

I'd check what GetLastError() returns after the call to GetDiskFreeSpaceEx to see what the problem is.

Pssst. You see that little light on your monitor? That's actually a government installed spy camera. Smile and wave to big brother!

Re: drive size

sunit53-Jul-05 20:28

sunit5

3-Jul-05 20:28

thanx a lot

Re: drive size

David Crow2-Jul-05 12:19

David Crow

2-Jul-05 12:19

sunit5 wrote:
lptotalbyte=_ui64toa(((PULARGE_INTEGER)&i64FreeBytesToCaller)->QuadPart,totalbyte,10);

Shouldn't this be:

_ui64toa(i64FreeBytesToCaller.QuadPart, totalbyte, 10);

sunit5 wrote:
...it is showing me wrong result

How are you verifying this "wrong result?"

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: drive size

sunit53-Jul-05 20:26

sunit5

3-Jul-05 20:26

thanx MR DAVID CROW I GOT THE CORRECT VALUE

Re: drive size

sunit53-Jul-05 20:27

sunit5

3-Jul-05 20:27

thanx to everyone

Re: drive size

Tom Archer2-Jul-05 11:38

Tom Archer

2-Jul-05 11:38

First call GetDriveTypeInfo and then GetDriveVolumeInfo. The latter will return data such as volume serial number, total disk space and free disk space

Cheers,
Tom Archer - Visual C++ MVP
Archer Consulting Group

"So look up ahead at times to come, despair is not for us. We have a world and more to see, while this remains behind." - James N. Rowe

Re: drive size

sunit53-Jul-05 20:28

sunit5

3-Jul-05 20:28

thanks a lot

How to write IMPLEMENT_SERIAL for this class

ComplexLifeForm1-Jul-05 20:11

ComplexLifeForm

1-Jul-05 20:11

Hi All,

I have a template class CustomList derived from MFC CList<ARG, ARG_TYPE> so that I can customize the serialization of the class

In .h file
// -------
template<typename T>
class CustomList : public CList<T,T>
{
DECLARE_SERIAL(CustomList)
public:
CustomList(): CList<T, T>()
{
}
virtual void Serialize(CArchive& ar);
};

In .cpp file
if I write
IMPLEMENT_SERIAL(CustomList, CList, 1)

I get a compiler error saying use of class template requires template argument list.

My question is how do I write IMPLEMENT_SERIAL macro so that my class is compiled correctly

Thanks

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