C / C++ / MFC Discussion Boards

meirav13-Apr-02 2:50

13-Apr-02 2:50

Hello Tim,

Thank you for your answer , I looked at this function and still didn't understand how to do that ( Set an Event automaticly every 100 milisecond),
I will appriciate if you can specify more or send me an example.

Bye Smile | :)

ON_WM_ERASEBKGND() never gets called?

dazinith12-Apr-02 5:18

dazinith

12-Apr-02 5:18

In my CFormView derived class my message map looks like (in .cpp):

BEGIN_MESSAGE_MAP(CMyFormView, CFormView)
ON_WM_ERASEBKGND()
ON_COMMAND(ID_PRINT_SELECTED,CFormView::OnFilePrint)
END_MESSAGE_MAP()

in my .h file i have:

afx_msg BOOL OnERASEBKGND(CDC* pDC); // also have tried virtual BOOL ...

and in my .cpp i have:

BOOL CMyFormView::OnERASEBKGND(CDC* pDC)
{
AfxMessageBox("erase");
return (TRUE);
}

why does my function for OnERASEBKGND never get called? i never get the messagebox.. any ideas?
obviously the point isn't to get a messagebox Smile | :)

im just checkin to see if it ever gets called..

-dz

Re: ON_WM_ERASEBKGND() never gets called?

lucy12-Apr-02 5:23

lucy

12-Apr-02 5:23

Seems you can only catch the WM_ERASEBKGND message in WindowProc of your CView.
snip:
LRESULT CMyView::WindowProc(UINT message, WPARAM wParam, LPARAM)
{
if ( message == WM_ERASEBKGND )
MessageBox("erase");
return CFormView::WindowProc(message, wParam, lParam);
}

Re: ON_WM_ERASEBKGND() never gets called?

dazinith12-Apr-02 5:52

dazinith

12-Apr-02 5:52

that does work, i then have it call OnERASEBKGND(GetDC()), but it seems to call the erasing after the drawing.. as my background gets drawn over the data.. thanks for the help tho!

Re: ON_WM_ERASEBKGND() never gets called?

lucy12-Apr-02 6:41

lucy

12-Apr-02 6:41

LRESULT CMyView::WindowProc(UINT message, WPARAM wParam, LPARAM)
{
   if ( message == WM_ERASEBKGND )
   {
      MessageBox("erase");
      return TRUE; /// <<<<  
   }
   return CFormView::WindowProc(message, wParam, lParam);
} 
<pre>

Re: ON_WM_ERASEBKGND() never gets called?

Shog⁹12-Apr-02 5:58

Shog⁹

12-Apr-02 5:58

It's OnEraseBkgnd() not OnERASEBKGND().

Developers that like shiny objects also dig case mods and scratch-and-sniff stickers.

Klaus Probst, The Lounge

Re: ON_WM_ERASEBKGND() never gets called?

dazinith12-Apr-02 5:57

dazinith

12-Apr-02 5:57

thanks a bunch Smile | :)

-dz

Tabs and List Control Box??

Aoife12-Apr-02 4:54

Aoife

12-Apr-02 4:54

The following code to populate a List Control Box with data from a database when a button is pressed works successfully when the List Control Box is placed on the main IDD_DIALOG. However when the List Control Box and button is placed on a tab, eg IDD_TAB1 the program hangs when the button is pressed.
(The header files "afxdb.h" and "odbcinst.h" are included in both the mainDlg.cpp and Tab1Dlg.cpp)

Any ideas as to why this is happening?
Any help is greatly appreciated.
Aoife

***********************************************************

void CInterfaceDlg::OnMainRead()
{

CDatabase database;
CString SqlString;
CString sNumber, sSender, sDate, sMessage;
CString sDriver = "MICROSOFT ACCESS DRIVER (*.mdb)";
CString sDsn;
CString sFile = "c:\\THE PROJECT\\Interface\\Project_Databases.mdb";
int iRec =0;

//Build ODBC connection string
sDsn.Format("ODBC;DRIVER={%s};DSN='';DBQ=%s",sDriver,sFile);

TRY
{
//Open the Database
database.Open(NULL,false,false,sDsn);

//Allocte the Record set
CRecordset recset (&database);

//Build the SQL statement
SqlString = "SELECT Number, Sender, Date, Message "
"FROM pc_Inbox";

//Execute the query
recset.Open(CRecordset::forwardOnly,SqlString,CRecordset::readOnly);

//Populate the Grids
ListView_SetExtendedListViewStyle(m_listControl,LVS_EX_GRIDLINES);

//Column width and heading
m_listControl.InsertColumn(0, "SMS No.", LVCFMT_LEFT, -1,0);
m_listControl.InsertColumn(1, "Sender", LVCFMT_LEFT, -1,1);
m_listControl.InsertColumn(2, "Date", LVCFMT_LEFT, -1,2);
m_listControl.InsertColumn(3, "Message", LVCFMT_LEFT, -1,3);

m_listControl.SetColumnWidth(0, 100);
m_listControl.SetColumnWidth(1, 100);
m_listControl.SetColumnWidth(2, 100);
m_listControl.SetColumnWidth(3, 200);

//Loop through each record
while (!recset.IsEOF())
{
//Copy each column into a variable
recset.GetFieldValue("Number",sNumber);
recset.GetFieldValue("Sender",sSender);
recset.GetFieldValue("Date",sDate);
recset.GetFieldValue("Message",sMessage);

//Insert values into the list control
iRec = m_listControl.InsertItem(0,sNumber,0);
m_listControl.SetItemText(0,1,sSender);
m_listControl.SetItemText(0,2,sDate);
m_listControl.SetItemText(0,3,sMessage);

//Go to the next record
recset.MoveNext();
}

//Close the Database
database.Close();
}

CATCH(CDBException, e)
{
//If a database exception occured, show an error message
AfxMessageBox("Database error: "+e->m_strError);
}
END_CATCH;

}

Re: Tabs and List Control Box??

wangyiming12-Apr-02 18:10

wangyiming

12-Apr-02 18:10

I try it. no problems!

maybe you should look:
1. use IsBOF before while ( oracle happen error when the recordset is empty)
2. sure Close Database at any condition

An interesing problem with CDialogBar

User 988512-Apr-02 4:42

User 9885

12-Apr-02 4:42

I have a CDialogBar instance docked on CFrameWnd derived class. If I undock the dialog bar and close it, then the 'x' on the right top of the FrameWnd does not close the window. It has no effect. Infact, it seems that the whole title bar gets disabled.

Interestingly this does not happen, when I hide the dialogbar through a menu item using the 'ShowControlBar' API.

Have you guys come across this before?

Thanks for any help

Thomas

modified 29-Aug-18 21:01pm.

HELP - Program crashes in Release Mode

Eldon Zacek12-Apr-02 4:30

Eldon Zacek

12-Apr-02 4:30

After recompiling program for release mode, the program crashes on startup
in Kernel32.DLL. I get the following error message:

First-chance exception in tachmate.exe (KERNEL32.DLL): 0xC0000005: Access Violation.

Any clue as how to attack this would be appreciated!

Thanks.

Eldon Zacek
Czech-Mate Enterprises, LLC

Re: HELP - Program crashes in Release Mode

Jeremy Falcon12-Apr-02 4:39

Jeremy Falcon

12-Apr-02 4:39

Debug it.

Jeremy L. Falcon
"The One Who Said, 'The One Who Said...'"
<nobr>
Homepage : Sonork = 100.16311
01000010011011110110001000100000011101110110000101110011
00100000011010000110010101110010011001010010111000000000

Re: HELP - Program crashes in Release Mode

12-Apr-02 4:36

did you verify that the arguments and compiling options are the same in debug and in release mode?

if yes, it's perhaps because release mode is faster than debug, so if you have a multithreaded app, it could crash because a threads are not launch at the same times.

wish that would help

Re: HELP - Program crashes in Release Mode

Tim Smith12-Apr-02 4:36

Tim Smith

12-Apr-02 4:36

Turn on debugging information in release mode. However, make sure you keep optimizations turned on.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Re: HELP - Program crashes in Release Mode

C^hris L^osinger12-Apr-02 4:37

C^hris L^osinger

12-Apr-02 4:37

the slow way: sprinkle file writes through out your program that say things like "I'm in function CFoo::DoFoo with params X, Y and Z". have these all go to the same file (appending to the file). you can use one of the many file logging classes here on CP for this.

the fast way: go to Project / Settings. in the C/C++ section, General category, change optimizations to Disabel (Debug); change Debug info to "Program Database for Edit and Continue" or "C7 Compatible". On the Link tab, check "Generate Debug Info". now, rebuild your app and debug it as you would a "Debug" build. be sure to change everything back, for your real release.

-c

Conscience is what hurts when everything else feels good.

Smaller Animals Software, Inc.

Re: HELP - Program crashes in Release Mode

Le centriste12-Apr-02 4:39

Le centriste

12-Apr-02 4:39

Configure your release build with debugging symbols, then run it through the debugger. I suggest:

1- After compiling the release version, run it outside the debugger. When it crashes, choose <Cancel> in the window in order to start the debugger. The debugger will point you at the point it crashes. Use the drop-down to navigate in the call stack.

2- If you didn't figure out right away what went wrong, you at least have a better idea of where to put your break points. Now you can run it inside the debugger.

AS a side note, this happens probably because the debug version of malloc puts guard bytes before and after the memory allocated, which it does not do for the non-debug version.

Michel

If I am wrong or said something stupid, I apologize in advance Wink | ;)

Re: HELP - Program crashes in Release Mode

James R. Twine12-Apr-02 9:29

James R. Twine

12-Apr-02 9:29

Tim Smith wrote:
However, make sure you keep optimizations turned on

Hmmm.... I was always under the impression (and experience) that the VC++ optimizer could do some strange things, so would it not make sense to have them turned off when trying to debug a release-only problem? Just to be sure that optimizations are not causing the problem?

Peace!

-=- James.

Re: HELP - Program crashes in Release Mode

Eldon Zacek12-Apr-02 5:13

Eldon Zacek

12-Apr-02 5:13

To all that have answered so far, Thanks.

Let me clarify a little more. The program is crashing during loading
of "Kernel32.DLL" before it is even getting to "WinApp". There is no
source code except assembly for this level of code. Something has
probably been screwed up in the environment; ie, from the program
crashing the AP-Studio.

Thanks again.

Eldon Zacek
Czech-Mate Enterprises, LLC

Re: HELP - Program crashes in Release Mode

Tim Smith12-Apr-02 8:17

Tim Smith

12-Apr-02 8:17

Then I bet you have global instances of some classes that are causing the crash when the application starts.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Re: HELP - Program crashes in Release Mode

Le centriste12-Apr-02 9:12

Le centriste

12-Apr-02 9:12

Yeah, check for their constructors.

Michel

If I am wrong or said something stupid, I apologize in advance Wink | ;)

Console questions

Jon Hulatt12-Apr-02 4:22

Jon Hulatt

12-Apr-02 4:22

Hi.

My MFC dialog app is using a console for dumping some boring status info. I AllocConsole() to get it.

Is there a way I can capture the user clicking the close [X] button on the console? and handle it?

Thanks

Jon

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Re: Console questions

lucy12-Apr-02 4:39

lucy

12-Apr-02 4:39

You might find your answer by looking at these help from MSDN:
AllocConsole (the console you allocated for your process)
GetStdHandle (get the handle of the above console) ( STD_INPUT_HANDLE)
Reading Input Buffer Event
mouse_event
and the MOUSEEVENT_XDOWN should be the event you interested in.
good luck!

Inhibe the ENTER and ESC KEYS ?

youssef12-Apr-02 4:03

youssef

12-Apr-02 4:03

Hi,
I created a project. I deleted the OK and CANCEL buttons. But when I execute my project and I press the ESC or ENTER KEYS, the project is stopped.

How can I do for inhibe this KEYS?

Best Regards

youssef

Re: Inhibe the ENTER and ESC KEYS ?

lucy12-Apr-02 4:05

lucy

12-Apr-02 4:05

I have this problem before as well. Although the button is not there, but you still have invisible OnOK() and OnCancel() function working for you! would you say it a feature or a bug? Wink | ;)

what I did is to overwrite the above two functions, and say if these two buttons don't have input focus, just return. Something like this:
if ( GetFocus() != GetDlgItem(IDOK))
return;
else
CDialog::OnOK();

Re: Inhibe the ENTER and ESC KEYS ?

wangyiming12-Apr-02 4:11

wangyiming

12-Apr-02 4:11

void CMyDialog::OnOk()
{
}

void CMyDialog::OnCancel()
{
}

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