C / C++ / MFC Discussion Boards

duggie28-Sep-01 8:09

28-Sep-01 8:09

Hi,

For data sensitivity reasons, I won't be able to send you the actual database. But I can give you a good feel for what is in the database. Some tables and a macro that has 2 steps. TransferText (this file xxx.txt that gets loaded into the database)and OpenQuery (opens a query and loads the result data into a table). I want to execute this Macro from VC++ through OleAutomation.

Your help is very much appreciated.

Thanks,

Re: OleAutomation

Carlos Antollini28-Sep-01 8:14

Carlos Antollini

28-Sep-01 8:14

I Understand, Don't worry for that, I will see your code in my home.

Best Regards!!!

Carlos Antollini.
Happy Friday!!!

Radio Btns

john john mackey20-Sep-01 7:08

john john mackey

20-Sep-01 7:08

Is there a trick to radio buttons where each button themselves may have a grouping of radio buttons? I want my sub-buttons to be disabled until the "parent" choice is selected.

Thanks.

Re: Radio Btns

Ravi Bhavnani20-Sep-01 7:55

Ravi Bhavnani

20-Sep-01 7:55

Will this help?

http://codeproject.com/staticctrl/ccheckstatic.asp

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Re: Radio Btns

Ravi Bhavnani20-Sep-01 11:21

Ravi Bhavnani

20-Sep-01 11:21

I think you want the "parent" buttons to belong to one group, and each collection of "sub-buttons" belong to individual groups.

Also, this seems like a good candidate for a mediator pattern. The sub-buttons would be listeners of the mediator. When a parent radio button is (un)checked, a message would be sent to the mediator, which would fire notifications to the sub-button. A sub-button would query the mediator for its enabled/disabled state.

You can also use the mediator to set focus to a specific group of sub-buttons when a parent is clicked. This makes the GUI user-friendly.

Finally, I would consider a different GUI approach. Choices within choices are easier to select when only ONE value of the parent is known at any time. For example, the parent radio buttons could be replaced by a single combo box which would cause a different set of sub-buttons to appear. You could also use one of these approaches:

http://codeproject.com/property/saprefs.asp
http://codeproject.com/dialog/ezoptionsdlg.asp

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Beginning whit ActiveX... How-To make an activeX control

Remi Morin20-Sep-01 5:43

Remi Morin

20-Sep-01 5:43

I've developped a good control, I want to do an active X whit it, I still don't know anything about it... someone know a good tutorial

thanks

Remi Morin
Rmorin@Operamail.com
Remi.Morin@Lyrtech.com

Unrecognised Database Format

sriram_mr19-Sep-01 23:45

sriram_mr

19-Sep-01 23:45

Hi ,I am trying to connect to an Access DB created using Access 2000.I am using VC6SP5.I keep on getting the CDaoException "Unrecognised Database Format".Even when trying to create a class out of class wizard , i get the same error.I have MDAC2.6 + Jet drivers installed.Am i doing something wrong???What do i need to do to make it work??

Thanks for your help.

Re: Unrecognised Database Format

Oscar Vazquez21-Sep-01 11:54

Oscar Vazquez

21-Sep-01 11:54

Visual C++ Wizard don't support Access 2000 database, but anyway you can access it from a Visual C++ app.

Add this code
CMyApp::InitInstance()
{
AfxGetModuleState()->m_dwVersion = 0x0601;

// ....... your needs
}
If you to create an Access 2000 Database
CDaoDatabase db;
db.Create("NewDatabase.mdb",dbLangGeneral,0x40); // 0x40 DB Version

For additional information, please see the following article in the Microsoft Knowledge Base:
236991 PRB: Unrecognized Database Format Error with Access 2000 Database

Explorer Like Resizing

Ray Kinsella19-Sep-01 23:13

Ray Kinsella

19-Sep-01 23:13

I have been building alot of 'Explorer' like apps lately in MFC. You know the type, TREEVIEW on the left and LISTVIEW on the right. Everytime he reviews what I have done, he sighs, and comments how great it would be to have the ability to move the border between the two controls (in an Explorer - esque) fashion.

Could some one point me in the direction of some MFC code to do this ?

Regards

Ray

"Je Suis Mort De Rire"

Re: Explorer Like Resizing

Christian Graus19-Sep-01 23:36

Christian Graus

19-Sep-01 23:36

I did something like that once by setting the cursor to an arrow in SetCursor if I was on the edge of the line, and simultaneously setting a bool to tell me if the user pressed the left button and started using the mouse I'd be repositioning controls. It's not hard to do, just call SetWindowPos or MoveWindow on the controls ( I like SetWindowPos because you can specify SWP_NOMOVE and just provide a size for the tree control ).

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

Re: Explorer Like Resizing

Ray Kinsella19-Sep-01 23:59

Ray Kinsella

19-Sep-01 23:59

I am developing in CE,
OnMouseMove doesn't seems to work doh!

Regards

Ray

"Je Suis Mort De Rire"

Re: Explorer Like Resizing

Michael P Butler20-Sep-01 0:38

Michael P Butler

20-Sep-01 0:38

Have a look a CSplitterWnd. There are a few articles on CodeProject.

http://www.codeproject.com/splitter/

Michael Smile | :)

Re: Explorer Like Resizing

Michael Dunn20-Sep-01 9:32

Michael Dunn

20-Sep-01 9:32

The MFC AppWizard can make an Explorer-style app, with two views in a splitter. You might want to make a dummy project with that wizard to see how it's done.

--Mike--
http://home.inreach.com/mdunn/
Ford: How would you react if I said that I'm not from Guildford after all, but from a small planet somewhere in the vicinity of Betelguese?
Arthur: I don't know. Why, do you think it's the sort of thing you're likely to say?

ADSI: CREATE ATTRIBUTE FAILED

19-Sep-01 22:11

HRESULT hr=ADsGetObject(L"WinNT://chenway",
IID_IADsContainer,
(void**)&pSchema);
LPOLESTR szBuffer = new OLECHAR[MAX_PATH*2];
wcscpy(szBuffer,L"cn=");
wcscat(szBuffer,L"TestAttrName");
if (!pSchema)
return E_POINTER;
hr = pSchema->Create(L"attributeSchema",szBuffer,&pDisp);

the pDisp pointer is returned NULL？why?

I want to add the user class a new attribute.

Creating DB #1

The_Server19-Sep-01 20:57

The_Server

19-Sep-01 20:57

Hi, all!!!
==========
I want to create my own DataBase.
new and improved DataBase,
fast and efficient DataBase,
source free Data Base...

But I have a little tiny problem:
Frown | :(

I don't know where to begin Frown | :(

please help

BTW: come to #CodeProject on DalNet (mIRC)

Re: Creating DB #1

Ray Kinsella19-Sep-01 23:16

Ray Kinsella

19-Sep-01 23:16

You could start with lookin at MySQL or PostgresSQL. Parictually MySQL its a widely used freee database implementation.

Regards

Ray

"Je Suis Mort De Rire"

Re: Creating DB #1

Tomasz Sowinski20-Sep-01 9:00

Tomasz Sowinski

20-Sep-01 9:00

source free Data Base

This will be the revolutionary product. Poke tongue | ;-P

Tomasz Sowinski -- http://www.shooltz.com

How to Convert CString to Char*

pathi19-Sep-01 18:29

pathi

19-Sep-01 18:29

Hi,
Iam getting problem with converting CString into Char* and vise versa.
If anyone helps me in this thanks for their help.
Regards
Pathi

bhikshapathi_g@semanticspace.com

Re: How to Convert CString to Char*

Nemanja Trifunovic19-Sep-01 19:08

Nemanja Trifunovic

19-Sep-01 19:08

<br />
CString str("Some string");<br />
char* chr = (char*)(const char*)str;<br />

I vote pro drink Beer | [beer]

Re: How to Convert CString to Char*

Michael Dunn19-Sep-01 19:43

Michael Dunn

19-Sep-01 19:43

That will break if the contents of str are modified. GetBuffer() is the right way to get a non-const pointer to the string.

--Mike--
http://home.inreach.com/mdunn/
Ford: How would you react if I said that I'm not from Guildford after all, but from a small planet somewhere in the vicinity of Betelguese?
Arthur: I don't know. Why, do you think it's the sort of thing you're likely to say?

Re: How to Convert CString to Char*

Christian Graus19-Sep-01 19:25

Christian Graus

19-Sep-01 19:25

You can create a CString from a char*, and to go back do this

CString s;
s.GetBuffer(s.GetLength()+1);
s.ReleaseBuffer();

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

Re: How to Convert CString to Char*

CodeGuy20-Sep-01 3:37

CodeGuy

20-Sep-01 3:37

Also, if you just need to pass a const char* to a CRT/WinAPI function, you can use

CString s = "a string";
CallMyCharFunction((LPCTSTR)s);

But if you really need a char* , use the methods above.

CodeGuy

The WTL newsgroup: 910 members and growing ... http://groups.yahoo.com/group/wtl

Re: How to Convert CString to Char*

Carlos Antollini20-Sep-01 5:40

Carlos Antollini

20-Sep-01 5:40

strcpy(szstr, str.GetBuffer()); //where str is a CString and szstr is a char*

Cheers!!!

Carlos Antollini.

Controlling deadlock

yccheok19-Sep-01 17:52

yccheok

19-Sep-01 17:52

I face some problem regarding the deadlock issues.

I am implementing a dining philosopher simulator and try to compare various algorithms. Some algorithm will cause deadlock as I expected.

However, is there any ways that I can explicitly release the thread from the deadlock (ie: like click on a "release philosopher from deadlock" button) after I am happy enough to see what deadlick look like.

One of my solution is using
WaitForSingleObject(chopstick_monitor, SOME_LONG_TIME);
instead of
WaitForSingleObject(chopstick_monitor, INFINITE);

However, is there any better way so that the philosopher will always remains at the deadlock state unless I command them to recover from deadlock.

thank you. if possible, pls e-mail the solution to yccheok@yahoo.com

regards
yccheok

Re: Controlling deadlock

Joaquín M López Muñoz19-Sep-01 20:15

Joaquín M López Muñoz

19-Sep-01 20:15

Have your philosophers wait for two events instead of one, and use the second to signal deadlock recovering:

HANDLE handles[2]={chopstick_monitor,deadlock_recover};
switch(WaitForMultipleObjects(2,handles,FALSE,INFINITE)){
  case WAIT_OBJECT_0: // chopstick_monitor
    ...
    break;
  case WAIT_OBJECT_0+1: // deadlock_recover
    ...
    break;
  ...
}

Better yet, have one deadlock recovering event for each philosopher so that you can control them individually.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

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