C / C++ / MFC

Re: Cannot access the file while one is accessing

6-Feb-08 22:27

Does this help?

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.

[my articles]

Iain Clarke, Warrior Programmer6-Feb-08 22:27

Re: Cannot access the file while one is accessing

6-Feb-08 22:27

Pardon?

You have created a program, and want it to only be run once at a time?

This is a little bit hard, but there are plenty of examples on codeproject. Just search for "singleton", or "run once"...

You have created a program, and it opens a file, and that file should not be openable by anybody else?

That;s the default - but don't take my word for it: look at the documentation for CreateFile, and the sharing flags like (eg) SHARE_DENY_WRITE etc.

------

Hi,
I am Iain, and I have not completed my Degree in psychic post-reading.
But I do realise that my sig is not the place for my CV - I have an about-me section on my member profil which anyone can see by clicking on my name.

Iain Clarke appearing in spite of being begged not to by ^CPallini.

David Crow7-Feb-08 2:33

David Crow

7-Feb-08 2:33

sharanu wrote:
which is better concept shall i use....

It all depends on how you are opening the file. In general, you want to open the file exclusively, or deny others read|write access.

insert text into notepad

<color>Aljechin 6-Feb-08 21:57

<color>Aljechin

6-Feb-08 21:57

i am trying to insert text into notepad.

CWnd *myWnd = FindWindow(_T("Notepad"), _T("Untitled - Notepad"));
if(myWnd)
{
::PostMessage(myWnd->GetSafeHwnd(),WM_CHAR,(BYTE)'a',0x000e0001);
//::PostMessage(myWnd->GetSafeHwnd(),WM_DESTROY,0,0);
}

if i enable the second line, notepad is quitting. how to insert a character? it is not working.

Iain Clarke, Warrior Programmer6-Feb-08 22:17

6-Feb-08 22:17

http://dictionary.reference.com/browse/destroy[^]
Destroy:

1.	to reduce (an object) to useless fragments, a useless form, or remains, as by rending, burning, or dissolving; injure beyond repair or renewal; demolish; ruin; annihilate.

You're getting the main window for notepad.exe - so it shouldn't come as a great shock that if you send a DESTROY! message, it closes. What did you expect?
Even if you actually had the text area for notepad, why on earth would you think WM_DESTROY would help you put a character there? I hope I'm missing out on something in your question that you didn't write down.

Your idea of sending a WM_CHAR isn't bad - but you're sending it to the main window for the application. If I use Spy++ on notepad, there are two child windows - a big edit one, and a status bar window. You could get the child window, and try sending the WM_CHAR to that. But that is implementation dependent. For all I know, notepad.exe under Vista is built completely differently. Maybe it uses a richedit window, rather than an edit one? Or Notepad under windows 2000 didn't have subwindows, it just worked as you expected.

I would have a look at WM_PASTE message. It's likely the notepad's parent window would pass it on to the child edit window to handle, and that would paste the contents of the clipboard into notepad. It is harder to set up some text on the clipboard - but there are samples on codeproject - and it would allow you to do more than one letter at a time.

I hope that helps,

Iain.

Iain Clarke appearing in spite of being begged not to by ^CPallini.

CPallini6-Feb-08 22:20

6-Feb-08 22:20

Iain Clarke wrote:
Iain Clarke appearing in spite of being begged not to by CPallini.

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.

[my articles]

Iain Clarke, Warrior Programmer6-Feb-08 22:30

6-Feb-08 22:30

I was wondering when you'd spot that... I'm going to have to change it now!

Iain.

Iain Clarke appearing in spite of being begged not to by ^CPallini.

<color>Aljechin 6-Feb-08 23:01

<color>Aljechin

6-Feb-08 23:01

can u please tell me how to get the handle of notepad's edit window/

CPallini6-Feb-08 23:23

6-Feb-08 23:23

What about EnumChildWindows [^]?
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.

[my articles]

<color>Aljechin 6-Feb-08 22:38

<color>Aljechin

6-Feb-08 22:38

Iain Clarke wrote:
I hope I'm missing out on something in your question that you didn't write down.

i mean the destroy msg is working and the wm keydown msg was not working. destroy is commented. paste is not working. any other alternative? thanks for the reply.

Mark Salsbery7-Feb-08 6:13

Mark Salsbery

7-Feb-08 6:13

Aljechin wrote:
i mean the destroy msg is working

WM_DESTROY is a notification message from the system.

Sending it to a window that actually isn't being destroyed
isn't going to do anything except possibly leave the target
application in an unstable state.

What are you expecting sending that message to do?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

baerten6-Feb-08 22:18

baerten

6-Feb-08 22:18

I'm not an expert on such operations but

do you have tried it already with a WM_KEY_DOWN?

CPallini6-Feb-08 22:22

Re: insert text into notepad [modified]

6-Feb-08 22:22

baerten wrote:
WM_KEY_DOWN

Uhmmm, are you sure the notepad is aware of such a message?
Big Grin | :-D

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.

[my articles]

Rajkumar R7-Feb-08 0:30

Rajkumar R

7-Feb-08 0:30

a plain dump solution, activate the notepad application and generate keyboard event
(keybd_event() API)

modified on Thursday, February 07, 2008 6:54:00 AM

from resource

josip cagalj6-Feb-08 21:55

josip cagalj

6-Feb-08 21:55

Hi to all.
I imported some files to resource (under ResourceView tab VC6). Main reason for this is so I don't need to distribute those files with application. In some time I need to load this files from resources and FTP transfer them away... How can I load them to say temp file?
Thanks in advance to all!

Iain Clarke, Warrior Programmer6-Feb-08 22:38

6-Feb-08 22:38

You can use FindResource to get an HRSRC handle to your resource.

Then SizeofResource to get it's size, and LoadResource / LockResource to get a handle on it.

Using that information, you can save the binary data to a temp file, then do whatever you like with it - including using APIs to FTP it somewhere.

Searching for those functions will give you their parameters.

Lastly, if you're using MFC, you may need AfxFindResourceHandle(?) to get the HINSTANCE the resource lives in in your app / dlls.

Good luck,

Iain.

Iain Clarke appearing regardless of ^CPallini.

josip cagalj7-Feb-08 0:28

josip cagalj

7-Feb-08 0:28

Thanks you very much. I'll try to do so now!

josip cagalj7-Feb-08 1:55

josip cagalj

7-Feb-08 1:55

Now when I loaded resource how I can save it to a file?
I created temp file but what api saves my loaded resource to a file?
THX

Iain Clarke, Warrior Programmer7-Feb-08 2:14

store and retrieve images from sql database

7-Feb-08 2:14

Using LockResource (as I said in my previous post), you can get a void pointer to the data (read only!), and using SizeofResource you get the amount of data.

So, you just need to save this lump of data to a file using WriteFile... Just as you would save any other lumps of data.

Have a look at GetTempFileName to get the filename for a throwaway file,
CreateFile to create it (oddly enough)
and WriteFile to save data into it.

If you look at the documentation for those, you should be good to go.

Iain.

Iain Clarke appearing in spite of being begged not to by ^CPallini.

Paulraj G6-Feb-08 21:45

Paulraj G

6-Feb-08 21:45

hi...

how can i store images to sql database?
how can i retreive image from sql database?

please help me. am trying this for last few days...

but still i didn't get...

thank you...

paulraj

Re: store and retrieve images from sql database

Iain Clarke, Warrior Programmer6-Feb-08 22:44