C / C++ / MFC

17-Nov-04 0:05

You can not use any functions that rely on the hWnd been set within the constructor of a CWnd derived class.

If you look at the code you will see that the pWnd is set but the hWnd is NULL.

The hWnd is set as the control is created.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

command line switches?

Keck16-Nov-04 23:26

Keck

16-Nov-04 23:26

I'm running a C program in visual C++ which uses command line switches. How do I use these as I've never used them before, and don't know how to specify either the commands or the the underlying options.
TIA

Keck

Antony M Kancidrowski17-Nov-04 0:11

17-Nov-04 0:11

Without knowing what application you are attempting to run I doubt we will be able to help.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

Keck17-Nov-04 0:19

Keck

17-Nov-04 0:19

Hi - thanks for responding anyway. I think I've just made a breakthrough myself while looking for a way to explain it better.

Thank you

Keck

handle12317-Nov-04 1:50

handle123

17-Nov-04 1:50

project->settings->debug->programarguments (might be this is wat u r looking for)

VC++: How can i know the Document object is created or not?

shiraztk17-Nov-04 3:12

shiraztk

17-Nov-04 3:12

command line options can be found at

Project>Settings>C/C++

You can see the project option are set there.
For c programs use the /Tc key and for c++ programs use /Tp key.

You can get complete list of compiler options can be found in MSDN.

I believe most of these options can be set using GUI itself.

Regards

The Best Relligion is Science.
Once you understand it, you will know God.

hemagiriyb16-Nov-04 23:25

hemagiriyb

16-Nov-04 23:25

BOOL CDocument::OnNewDocument()
{
.............//in this place how can i know weather document object is
.............//created or not.
.............//
}

Hemagiri Y B
S/W Engg
INDIA

Re: VC++: How can i know the Document object is created or not?

John R. Shaw17-Nov-04 10:00

John R. Shaw

17-Nov-04 10:00

Both the CSingleDocTemplate and CMultiDocTemplate class contain this call:
AfxMessageBox(AFX_IDP_FAILED_TO_CREATE_DOC);
to inform the application user that it failed to create the document.

For development purposes (DEBUGING) they also produce messages in the Build results windows using:
TRACE0("CDocTemplate::CreateNewDocument returned NULL.\n");

The base CDocument::OnNewDocument() just does some intialization of existing variables. In a single document/view: this means you need to destroy any previous information your document is holding and reinitialize any needed variables. In a multiple document/view: this means you may need to initialize some data variables needed to store your data.

//Example in a very simple text ASCII editor
BOOL CMyEditDoc::OnNewDocument()
{
	if( !CDocument::OnNewDocument() )
		return FALSE;
	if( !MyInitFunction() )
        {
		// show my error message box here
		return FALSE;
	}
	return TRUE;
}

For both single and muli-doc application: The document object already exist before this member function is called, otherwize this function could not have been called ligaly. The document and the document object that holds it are 2 different things. Note: If this function fails (return FALSE) then any window created to view the data is automaticaly destroyed (the document object may also be destroyed).

A bit long winded, but I hope it helps a little.

INTP

Parse a XML from a CHttpFile object

Cris16-Nov-04 23:10

Cris

16-Nov-04 23:10

Hello,
How could i parse a XML from a CHttpFile object (response from a HTTP request)?
Which class or method can i use?

[]'
Cris

cgi

hou_12616-Nov-04 23:09

hou_126

16-Nov-04 23:09

a cgi acessing oracle which wrote by VC,HOW TO DO IT ?plese tell me about it or some source code about it .Thanks a lot !

coinstaller build - vc6 vs. vc7

calin_iaru16-Nov-04 22:33

calin_iaru

16-Nov-04 22:33

Hi,

I am trying to port a vc6 coinstaller project (basically a DLL) to vc7. It compiles and builds correctly. The difference is that the new vc7 DLL does not display the property page for a particular device. The vc6 build is doing it correctly. I have coded an exception in the CoInstallerFunc but I see that the device Manager is not calling it.

I also posted this message to some MS discussion forums and I keep getting errors like "Your Passport session has expired. You need to sign in again before you can post to this group." I sign in and no change. I delete cookies, still no change. Looked on Google without success. So how do I post a new question to an MS newsgroup when this message appears? (It's ironic that I ask a discussion board on how to post to a newsgroup, but anyway...)

access to the serial port

doneirik16-Nov-04 21:51

doneirik

16-Nov-04 21:51

Hi,
I want to access the serial port on my pc, programming with visual c++ .net under winNT.4. Can anyone suggest a good tutorial on this subject or give me a lead.

regards, donEirik

Re: access to the serial port

pubududilena16-Nov-04 23:12

pubududilena

16-Nov-04 23:12

hi you can find from here:
http://www.codeproject.com/system/#Hardware+programming[^]

Re: access to the serial port

Antony M Kancidrowski17-Nov-04 0:15

a device driver for windows 2000

17-Nov-04 0:15

Serial communication is the same as reading and writing files. The above mensioned tutorials / examples will help you out.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

snthomas16-Nov-04 20:44

snthomas

16-Nov-04 20:44

anyone can help in creating a device driver for windows 2000.I don't know even basics of device drivers.

Antony M Kancidrowski17-Nov-04 0:19

17-Nov-04 0:19

Have you looked at any DDK examples?

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

snthomas17-Nov-04 1:13

snthomas

17-Nov-04 1:13

I don't have a ddk.where can i get it.pls advise.

Antony M Kancidrowski17-Nov-04 10:25

17-Nov-04 10:25

The DDK is available from Microsoft. It comes as part of the MSDN subscription. I am not sure if you can download it without a subscription nor whether it is available alone. Try searching for DDK on www.microsoft.com[^]

Hope this helps you out.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)