Re: CreateFile problem - C / C++ / MFC Discussion Boards

Invoking an executable program from a remote machine

8-Jul-02 23:22

Hi all,
I'm working with a database application in which the data base is located in a remote machine(Machine 1).The application which makes use of that data base is running on a remote machine(Machine 2).Both computers are running under Windows 2000 and are connected in LAN.I would like to clear my database(The database located in machine 1) once in a month by running an exe in that machine.How can i invoke another executable program(program for backing up the data base) which is located in machine 2 when the data base clearing program in machine 1 is just started.Can any one help me?.
With regards.

Shibu K.V.
Senior Research Associate.
VLSI ASIC Hardware Design Group
Electronics R&D Centre,Trivandrum
India

Re: Invoking an executable program from a remote machine

Prem Kumar9-Jul-02 0:16

Prem Kumar

9-Jul-02 0:16

There is no existing infrastructure in place currently
to invoke a program at the remote machine.

Wait there is one way, Use the Task Schedular API.
But make sure that the remote exe is scheduled to
a future time and that it does not have a UI.

Or you could always use a Service and keep
listening on a specified port.

Re: Invoking an executable program from a remote machine

Ollie9-Jul-02 0:37

Ollie

9-Jul-02 0:37

Most database applications have ablility to schedule tasks and jobs, so why write an application to do it?

Re: Invoking an executable program from a remote machine

Renjith Ramachandran9-Jul-02 0:54

Renjith Ramachandran

9-Jul-02 0:54

use the Sheduletask API
or write a service

Renjith-CPian.

CreateFile problem

Senkwe Chanda8-Jul-02 23:04

Senkwe Chanda

8-Jul-02 23:04

Ok, this is a revisit to the problem that Chris Losinger tried to help me with. I had wrongly thought GetFileSize was the problem, he helped me determine that was not the case, thanks again Chris!!

I have an app associated with a certain file type. When I double click the file, it opens up my app. In this way the file name is passed to the app. This works fine and I have proved it by popping a message box with the filename on it. As you can see below m_EncryptedFilePath is the file name in question.

HANDLE hOriginal = ::CreateFile(m_EncryptedFilePath,           
               GENERIC_READ,              
               FILE_SHARE_READ,           
               NULL,                      
               OPEN_EXISTING,             
               FILE_ATTRIBUTE_NORMAL,     			   
               NULL);

Now, in DEBUG mode, all is dandy. hOriginal is not NULL. But in RELEASE mode, it is NULL even though the correct file name is passed through in each case.

Could it be file permissions?? Access rights?? The way I'm associating the file with the app??

By the way, release mode works fine if I hard code the file name like so

HANDLE hOriginal = ::CreateFile("c:\\myfile.abc",           
               GENERIC_READ,              
               FILE_SHARE_READ,           
               NULL,                      
               OPEN_EXISTING,             
               FILE_ATTRIBUTE_NORMAL,     			   
               NULL);

So I'm completely at my wits end over this at the moment. Any and all comments will be appreciated.

Senwe

And when God, who created the entire universe with all of its glories, decides to deliver a message to humanity, He WILL NOT use, as His messenger, a person on cable TV with a bad hairstyle.

Re: CreateFile problem

KarstenK8-Jul-02 23:12

KarstenK

8-Jul-02 23:12

What does GetLastError() return?

Re: CreateFile problem

Senkwe Chanda8-Jul-02 23:15

Senkwe Chanda

8-Jul-02 23:15

Good question, in DEBUG mode it returns 0, implying all is well. That's why when I'm debugging everything works. The release version of CreateFile returns a NULL handle.

Perhaps I should place a FormatMessage and populate a MessageBox to retrieve GetLastError in my release mode?

And when God, who created the entire universe with all of its glories, decides to deliver a message to humanity, He WILL NOT use, as His messenger, a person on cable TV with a bad hairstyle.

Re: CreateFile problem

KarstenK8-Jul-02 23:34

KarstenK

8-Jul-02 23:34

If you think, that to populate a MessageBox is the right answer, you have to do it. (If you know what I mean)

I also have these type of problems and I have to fix them. The first step is to get a "handle" to the problem.

You have there a member variable for the file name. I guess it is a CString -> (LPCSTR) cast is best practise.

Try also Release Output of it to check its ok. ( I Do a Findfile to check this). Unsure | :~

Re: CreateFile problem

Senkwe Chanda8-Jul-02 23:38

Senkwe Chanda

8-Jul-02 23:38

KarstenK wrote:
The first step is to get a "handle" to the problem.

Yep and my assumption was correct, the file isn't being recognised. GetLastError confirms this.

KarstenK wrote:
I guess it is a CString -> (LPCSTR) cast is best practise

Well yes, a WTL CString, not an MFC CString Smile | :)

And when God, who created the entire universe with all of its glories, decides to deliver a message to humanity, He WILL NOT use, as His messenger, a person on cable TV with a bad hairstyle.

Re: CreateFile problem

Senkwe Chanda8-Jul-02 23:23

Senkwe Chanda

8-Jul-02 23:23

GetLastError returns the following...

The filename, directoryname, or volume label syntax is incorrect

Which is what I assumed...but I just don't see how or why.

And when God, who created the entire universe with all of its glories, decides to deliver a message to humanity, He WILL NOT use, as His messenger, a person on cable TV with a bad hairstyle.

Re: CreateFile problem

Ollie8-Jul-02 23:29

Ollie

8-Jul-02 23:29

Hi,

Sounds like a memory allocation\deallocation problem with 'm_EncryptedFilePath' especially if the path is correct('\\' etc) and it works when you hard code the path.

What type of string is 'm_EncryptedFilePath'?

Re: CreateFile problem

Senkwe Chanda8-Jul-02 23:31

Senkwe Chanda

8-Jul-02 23:31

Hi Ollie, it's a WTL CString. I've always used it as a drop in replacement for MFC's CString in most cases.

And when God, who created the entire universe with all of its glories, decides to deliver a message to humanity, He WILL NOT use, as His messenger, a person on cable TV with a bad hairstyle.

Re: CreateFile problem

Ollie9-Jul-02 0:01

Ollie

9-Jul-02 0:01

have you tried making a local copy of the string and then using it, sorry not up to speed on WTL CString, what is the underlying type?

Re: CreateFile problem

Senkwe Chanda9-Jul-02 0:06

Senkwe Chanda

9-Jul-02 0:06

No prob Ollie, it's a great library as you already know I'm sure, please do explore it for your new win32 work Smile | :)

The underlying type is LPTSTR. I think you're onto something though. Let me explore the CString header file more carefully.

And when God, who created the entire universe with all of its glories, decides to deliver a message to humanity, He WILL NOT use, as His messenger, a person on cable TV with a bad hairstyle.

draw on a dialog

John Oliver8-Jul-02 22:56

John Oliver

8-Jul-02 22:56

Hello,
I'm trying to draw on a dialog but I'm having no luck with the following code. It's my first time doing any gdi/device context stuff. I know there's better ways to display info than writing directly to a dialog but it's a bit of a hack. If anybody can help, thank-you.
John

//in oninitdialog
CPaintDC dc(this); // device context for painting

CPen* oldPen;
CPen pen(PS_SOLID, 1, RGB(0,0,0));
oldPen = dc.SelectObject(&pen);

dc.TextOut(20,20,"Mean Flow Velocity (m/s)");
dc.SelectObject(oldPen);

Re: draw on a dialog

Prem Kumar8-Jul-02 23:30

Prem Kumar

8-Jul-02 23:30

Hi,

You r not supposed to use the drawing code in
OnInitDialog and more over CPaintDC should
be used only when processing the WM_PAINT msg
i.e only in OnPaint.(How abt brushing up a bit
on the documentation ?)

So move you code to OnPaint.

Re: draw on a dialog

John Oliver9-Jul-02 0:04

John Oliver

9-Jul-02 0:04

Thanks Prem
It works now.

I'm using the following in OnPaint...
CFont* pFont;
CFont* pOrigFont;

pFont= GetFont();
pOrigFont = pdc->SelectObject(pFont);

pdc->SetBkColor(GetSysColor(COLOR_BTNFACE));

pdc->TextOut(40,40,"Mean Flow Velocity (m/s)");

Mouse

8-Jul-02 21:30

hi to all,

do u know how to get message of "copy" from rt click of a mouse.
for getting mouse message we use getkeystate..

mmioRead,simple ..Please ..Helpme

8-Jul-02 20:48

hi all.
i have to Read the data for a Particular Portion of a wave file, as an Integer array or a Byte array.
how i can i use the mmioRead function for above.
Please help me very urgent
thanks in advance.
Rose | [Rose]

Custom captions with WM_NCPAINT

Michael Dunn8-Jul-02 20:21

Michael Dunn

8-Jul-02 20:21

Has anyone done a custom-drawn caption & border using WM_NCCALCSIZE, WM_NCACTIVATE, and WM_NCPAINT? I'm trying it this way in a WTL app (as opposed to removing WS_CAPTION, and just drawing the edges of the client area to look like a border) and there are two things I can't solve.

The standard min/max/close buttons get drawn by the system when the mouse moves in the border.
The buttons get drawn when you r-click in the caption area.

It seems no one has written about using those messages (aside from the neat MFC custom caption article, which alas only helped partway) so I'm stumped as to what to try next. Handling WM_NCMOUSEMOVE does work around problem 1, but I still have no solution to #2.

(Actually, Paul D. glossed over this problem in a C++ Q+A article, and said removing those buttons and the gray line at the bottom of the caption would take "a gazillion lines of code" Cry | :((

)

--Mike--
Just released - RightClick-Encrypt v1.3 - Adds fast & easy file encryption to Explorer
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Re: Custom captions with WM_NCPAINT

Roger Allen8-Jul-02 23:36

Roger Allen

8-Jul-02 23:36

Did you look at the custom caption aricle by David Lorde?

Roger Allen
Sonork 100.10016

If I had a quote, it would be a very good one.

Re: Custom captions with WM_NCPAINT

KaЯl9-Jul-02 5:15

KaЯl

9-Jul-02 5:15

I remember an article using these messages, written by Roger Onslow. It was about Flat toolbars, and WM_NCPAINT was used to draw grippers (in fact, no, but you will understand looking to the article).

The article may be found at codeguru.earthweb.com/toolbar/devstudio_like.shtml

Another implementation on WM_NCPAINT was the fantastic Cristi Posea's docking windows. At the time I've customized it to add a close button on it, drawn flat if mouse pointer wasn't over (the latest version of this article should have this functionnality to). If I remember well I used WM_NCHITTEST to know the mouse position and determin if it was over a "sensitive" area.

HTH,

We do not inherit the Earth from our ancestors. We borrow it from our children.

Antoine de Saint Exupéry (1900-1944)

Help!Change state in ListCtrl

8-Jul-02 19:36

Hi!
In my progect i use ListCtrl with multi selection items.If user select any items from ListCtrl and then press on button "Delete" i delete selected items from ListCtrl(i use GetFirstSelectedItem,GetNextSelectedItem).The problem is when ListCtrl lost focus.Because user after many action can again press button "Delete" and ListCtrl "Remember" selected items.I want to do if ListCtrl lost focus clear all selected items.And when ListCtrl recieve focus to do that user will can select again many items.Help me,please,how can i do this!!!
Ira.

Re: Help!Change state in ListCtrl

KaЯl9-Jul-02 4:25

KaЯl

9-Jul-02 4:25

Have you tried to call

CListCtrl::SetItemState(mySelectedItemIndex, !LVIS_SELECTED, LVIS_SELECTED); ?

where mySelectedItemIndex belongs to your selected items index ?

We do not inherit the Earth from our ancestors. We borrow it from our children.

Antoine de Saint Exupéry (1900-1944)

Please,Pleaseeeeeeeeeeeee..

8-Jul-02 19:01

hi all,
I am using "mciSendString" api function to record the wave audio through
microphone.
My question is how can i capture the audio data in Integer array while recording?
Because I have to Plot the line graph(spectrum) by using these values while recording(real Time)
Please help me.
Is there any other method to Plot the graph while recording(realTime)
Thank in advance.

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