MultiThreading - C / C++ / MFC Discussion Boards

p_196022-Mar-09 20:40

p_1960

22-Mar-09 20:40

Hi,

When im using the below code

SHFILEOPSTRUCTW sh;

sh.hwnd = GetSafeHwnd();
sh.wFunc = FO_DELETE;
sh.pFrom = L"C:\\Documents and Settings\\Myid\\Local Settings\\Temp\\Tester";
sh.pTo = NULL;
sh.fFlags = FOF_NOCONFIRMATION | FOF_SILENT;
sh.hNameMappings = 0;
sh.lpszProgressTitle = NULL;

SHFileOperationW (&sh);

im getting the error...
cannot delete file:Cannot read from the source file or disk...

and when im using the SHFILEOPSTRUCTA it is deleting.... can u plesase tell me what"s the difference in these two ....(SHFILEOPSTRUCTW and SHFILEOPSTRUCTW)...and i have to use unicode only.....

modified on Monday, March 23, 2009 4:23 AM

Re: SHFILEOPSTRUCT in unicode

Jijo.Raj22-Mar-09 20:53

Jijo.Raj

22-Mar-09 20:53

p_1960 wrote:
and when im using the SHFILEOPSTRUCTA it is deleting.... can u plesase tell me what"s the difference in these two ....(SHFILEOPSTRUCTW and SHFILEOPSTRUCTW)...and i have to use unicode only.....

both are same.

Well, Why do you choose unicode or Ansi version by yourself? just use SHFILEOPSTRUCT + SHFileOperation() and enclose strings in _T() macro. So that the unicode or ansi version will be selected automatically. For instance,

SHFILEOPSTRUCT sh;

sh.hwnd = GetSafeHwnd();
sh.wFunc = FO_DELETE;
sh.pFrom = _T( "C:\\Documents and Settings\\ICS400758\\Local Settings\\Temp\\Tester");
sh.pTo = NULL;
sh.fFlags = FOF_NOCONFIRMATION | FOF_SILENT;
sh.hNameMappings = 0;
sh.lpszProgressTitle = NULL;

SHFileOperation (&sh);

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: SHFILEOPSTRUCT in unicode

p_196022-Mar-09 22:07

p_1960

22-Mar-09 22:07

Thanks for ur reply.....

Even i used the code which u gave im getting the same error

cannot delete file:Cannot read from the source file or disk...

Please help me out...

Re: SHFILEOPSTRUCT in unicode

CPallini22-Mar-09 22:14

CPallini

22-Mar-09 22:14

Please show us the code that is working.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: SHFILEOPSTRUCT in unicode [modified]

Iain Clarke, Warrior Programmer22-Mar-09 23:45

Iain Clarke, Warrior Programmer

22-Mar-09 23:45

I think I may have found your issue...

MSDN wrote:
pFrom
Address of a buffer to specify one or more source file names. These names must be fully qualified paths. Standard DOS wild cards, such as "*", are permitted in the file-name position. Although this member is declared as a null-terminated string, it is used as a buffer to hold multiple file names. Each file name must be terminated by a single NULL character. An additional NULL character must be appended to the end of the final name to indicate the end of pFrom.

You don't give an additional NULL, so the shell operation carries on looking for the next string... which will be gobbledegook at best. I think the compiler is adding padding, which is why the next character stands a better chance of being NULL in the ansi version then the unicode version. This theory is very handwavy and untested, but you are not following the manual either way.

So, try:

sh.pFrom = T("C:\\Documents and Settings\\Myid\\Local Settings\\Temp\\Tester\0"); // Give it an extra NULL.

Less importantly, I'd write

sh.hNameMappings = NULL;

MSDN wrote:
...Treat hNameMappings as a pointer to a structure...

It's the same thing really, but it will help you in a years time and you come back to read the code...

Hope that helped,

Iain.

In the process of moving to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), give me a job!

modified on Monday, March 23, 2009 5:57 AM

Re: SHFILEOPSTRUCT in unicode

p_196023-Mar-09 0:05

p_1960

23-Mar-09 0:05

sh.hwnd =GetSafeHwnd();

Please let me know What exactly the above line of code indicates...

Re: SHFILEOPSTRUCT in unicode

Iain Clarke, Warrior Programmer23-Mar-09 0:13

Iain Clarke, Warrior Programmer

23-Mar-09 0:13

Erm...

If I'm not mistaken, didn't *you* write the code that you're now asking me about?

Shouldn't you be telling *me* what it means?

It's all well and good cutting and pasting code from other places, but you need to read the documentation first. I can forgive missing the extra NULL at the end of the string - it's a bit subtle, but I can't forgive not bothering to read the manual for a function you're having trouble using.

If you don't have MSDN installed on your PC... follow this link:
http://www.lmgtfy.com/?q=msdn+SHFILEOPSTRUCT[^]
and then read the hwnd part.

Good luck,

Iain.

In the process of moving to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), give me a job!

MultiThreading

NewVC++22-Mar-09 19:45

NewVC++

22-Mar-09 19:45

Hi All

How can i create and call multithreading?i am try to call a function through thread more than one time.Plz help me

Re: MultiThreading

_AnsHUMAN_ 22-Mar-09 20:00

_AnsHUMAN_

22-Mar-09 20:00

NewVC++ wrote:
How can i create and call multithreading

No you don't create something known as multithreading or neither call it. It's a concept where you instantiate multiple threads, allow them to run, synchronize them and blah blah....
You will find some excellent articles on multithreading on Code Project. Just use the search window
If you are calling the same function on the same thread than it is not multi threading.
You can use a while loop inside the thread function and call the required function as many times as you need.

You need to google first, if you have "It's urgent please" mentioned in your question.
Wink | ;-)

_AnShUmAn_

Re: MultiThreading

NewVC++22-Mar-09 20:17

NewVC++

22-Mar-09 20:17

Can you give me some code example?

Re: MultiThreading

_AnsHUMAN_ 22-Mar-09 20:22

_AnsHUMAN_

22-Mar-09 20:22

See here[^] and here[^]

You need to google first, if you have "It's urgent please" mentioned in your question.
Wink | ;-)

_AnShUmAn_

Re: MultiThreading

David Crow23-Mar-09 3:34

David Crow

23-Mar-09 3:34

NewVC++ wrote:
Plz help me

Read here and here.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Drag & drop between tree controls(Very Urgent........)

AnithaSubramani22-Mar-09 19:22

AnithaSubramani

22-Mar-09 19:22

Hi All,

I have 2 tree controls.Now i need to access Drag and Drop between them in Dialog based application.I need some idea or sample code for this.Its very urgent for me.

Plz help me.........

Thanks & Regards,
Anitha

Re: Drag & drop between tree controls(Very Urgent........)

Jijo.Raj22-Mar-09 19:45

Jijo.Raj

22-Mar-09 19:45

Hello Anitha,

Check out this tutorial series from catch22 -
OLE Drag and Drop[^].

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: Drag & drop between tree controls(Very Urgent........)

Iain Clarke, Warrior Programmer23-Mar-09 0:07

Iain Clarke, Warrior Programmer

23-Mar-09 0:07

Well, if it's so urgent, I won't type any code for you, I'd be too slow...

Instead, I'll point you at the http://www.codeproject.com/KB/tree/[^] section here on codeproject.

Do a search for drag, and this was the fourth entry (first was an advert!)
http://www.codeproject.com/KB/tree/shtree.aspx[^]
Also:
http://www.codeproject.com/KB/tree/treedragndropdemo.aspx[^]

I hope they help,

Iain.

In the process of moving to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), give me a job!

Re: Drag & drop between tree controls(Very Urgent........)

David Crow23-Mar-09 3:37

David Crow

23-Mar-09 3:37

Have you read up on DragAcceptFiles(), DragQueryFile(), and WM_DROPFILES?

Ole problem when using with Microsoft Power Point

Member 411184722-Mar-09 18:40

Member 4111847

22-Mar-09 18:40

Hello Sir/Mam,

I am working on Microsoft power point using Microsoft VC++ 2008 . I want to know ,when i create an instance of power point Application then no one can see the application or it should not be visible after activate a presentation.
When i use Setvisible(FALSE) function, there is exception occured.

Build Errors Using CString not CStringT

ForNow22-Mar-09 10:53

ForNow

22-Mar-09 10:53

Hi,

I am C++ newbie so.... I was trying to derive an Object from CString

Since Derived Classes can access protected members I tried to access

m_pchData

When I got an errors message that m_pchData was undefined I tried to

qualify it by using CString :: m_pchData

When I got the following error message

I dont get I am using CString in afx.H not CStringT in afxstr.h

Error 1 error C2039: 'm_pchData' : is not a member of 'ATL::CStringT<basetype,stringtraits>'

Re: Build Errors Using CString not CStringT

Joe Woodbury22-Mar-09 14:35

Joe Woodbury

22-Mar-09 14:35

m_pchData doesn't exist in MFC for VS 2005 or 2008. In these, m_pszData is private, but you have helper functions to access it.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Re: Build Errors Using CString not CStringT

ForNow22-Mar-09 14:51

ForNow

22-Mar-09 14:51

I understand but why does the compiler reference CStringT

When I used the CString object

Re: Build Errors Using CString not CStringT

Joe Woodbury22-Mar-09 14:59

Joe Woodbury

22-Mar-09 14:59

CString is simply a typedef of CStringT. CStringT is derived from CSimpleString. This combination allows various encoding methods to be used with the same code. Thus you have CStringA (using char) and CStringW (using wchar_t) as basic types. In theory you could create even more types by using the templates and adding you own helper classes.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Re: Build Errors Using CString not CStringT

ForNow22-Mar-09 15:12

ForNow

22-Mar-09 15:12

So ....CStringT is for regular excuse the term string char
as opposed to Unicode

The members of CString are really in AFX.H were Cstring is defined

Re: Build Errors Using CString not CStringT

Joe Woodbury22-Mar-09 15:25

Joe Woodbury

22-Mar-09 15:25

No, CStringT is a template class that allows you to instantiate a string class that uses ANSI, UNICODE or whatever encoding scheme you want to try.

CString is a typedef of CStringT. The typedef for CString is NOT defined in afx.h. As far as I can tell, you are confusing VC++ 6.0 and VS 2005/2008.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Re: Build Errors Using CString not CStringT

ForNow22-Mar-09 15:42

ForNow

22-Mar-09 15:42

You could be right thr AFX.H member where I found CString

Was in my Platfork SDK folder

Not in the VC folder (Part of Visual Studio SubDir)

Thankx

Re: Build Errors Using CString not CStringT

Joe Woodbury22-Mar-09 15:57

Joe Woodbury

22-Mar-09 15:57

Do NOT use any MFC from a platform SDK. You shouldn't even be referencing such an outdated SDK in VS 2005/2008 since it will cause other frustrations. (I rarely use the Platform SDK and when I do, I always install it in a Virtual PC, clean out the dross and then copy the directories out and then only use it by specific reference in the a project file.)

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.