C / C++ / MFC

Re: Getting what's been clicked in a CTreeCtrl

13-Jun-04 7:11

Hello
I've got a CTreeCtrl. When i double-click on one of the items, i want to get in a CString the string of where i doubleclicked.

the following code

CString temp;
HTREEITEM hItem = m_tree.GetSelectedItem();
            temp = m_tree.GetItemText(hItem);

gives me a runtime error.
any ideas?
thanks!!

Ravi Bhavnani13-Jun-04 7:56

Ravi Bhavnani

13-Jun-04 7:56

Perhaps hItem is NULL? What's the run-time error you're getting?

/ravi

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Re: Getting what's been clicked in a CTreeCtrl

kfaday13-Jun-04 9:45

Re: Getting what's been clicked in a CTreeCtrl

13-Jun-04 9:45

it was null
thanks!!

Sumit Kapoor13-Jun-04 20:32

Sumit Kapoor

13-Jun-04 20:32

HI..Dear..
You need to trap event selChanged & in that even you can get value.. e.g.: I'm traping tree in view by using following code..you can do simmilar
bye

void CLeftFirstTreeView::OnSelchanged(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;

CString aa;
aa.Format("%s", GetTreeCtrl( ).GetItemText(pNMTreeView->itemNew.hItem ));
MessageBox(aa);
}

Tha's it.. you can do this in tree control by traping same event...
bye again

---Sumit Kapoor---

Creating Access file with the password

Anonymous13-Jun-04 5:35

Anonymous

13-Jun-04 5:35

COuld anyone help me , please?!

I need to create an empty MS Access file with the password.
Assume that I create MS access file like that:

BOOL bl=SQLConfigDataSource(NULL, ODBC_ADD_DSN, _T("Microsoft Access Driver (*.mdb)"),"CREATE_DB=C:\\3\\_pwd.mdb\0PWD=123\0\0");

CREATE_DB - Creates a database file.
BUT how can I set up the password in that file ( _pwd.mdb) ?? That method of using SQLConfigDataSource doesn't work!!!!!!!!!!! The file has created, but there is no a password.
PLEEEAAASE SOMEBODY HELP ME!!!!

How can I use and compile my project that contain 16 bit API?

Behzad Ebrahimi13-Jun-04 4:26

Behzad Ebrahimi

13-Jun-04 4:26

Hi all.
I want to create a Device Installation application in Win98.

I have VC++ 6 and DDK98.
How can I use 16 bits function such as DiInstallDevice! Confused | :confused:

Re: How can I use and compile my project that contain 16 bit API?

John R. Shaw13-Jun-04 11:04

John R. Shaw

13-Jun-04 11:04

Results of search:
The argument to DiInstallDevice & DiInstallClass is compatible with 32-bit calling convention.

DDK98:
Extract Bin_Win98_ml.exe change name to ml.exe and copy it to VC98\BIN.
Extract Bin_Win98_ml.err change name to ml.err and copy it to VC98\BIN.

Looking at the USB examples that come with the DDK should help.

Note:
www.bluewartersystems.com has a DDK wizard that is supposed to ease the development of DDs.

MSDN:
1) Q222820 (and many other possible problems)
2) Implementing the New Win32 Driver Model for Windows 98 and Windows NT 5.0.
3) An Inside Look at Developing Applications Using the New Features of Visual C++ 6.0.

Well I hope that helps!

INTP

mfc: load a cursor resource

kfaday13-Jun-04 4:19

13-Jun-04 4:19

Hi!, i've created a cursor with the resource editor. i want to load it when i press a button. i've tried with this code, but it doesn't work:

HCURSOR hCursor;
hCursor = AfxGetApp()->LoadCursor(IDC_MYCURSOR);

any ideas?
thanks!

Dominik Reichl13-Jun-04 5:04

Dominik Reichl

13-Jun-04 5:04

This code looks well and should work nicely. Check what hCursor is, if it's something non-zero or NULL.

Of course, if you want to display the cursor, you must use the SetCursor API function, see MSDN for more.

Best regards,
Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

kfaday13-Jun-04 5:24

13-Jun-04 5:24

that's what i want to do.. to display it.
should i call SetCursor, or it is called automatically, like OnPaint or the like?

Dominik Reichl13-Jun-04 5:59

Dominik Reichl

13-Jun-04 5:59

The remarks section of SetCursor in MSDN:

The cursor is set only if the new cursor is different from the previous cursor; otherwise, the function returns immediately.

The cursor is a shared resource. A window should set the cursor shape only when the cursor is in its client area or when the window is capturing mouse input. In systems without a mouse, the window should restore the previous cursor before the cursor leaves the client area or before it relinquishes control to another window.

If your application must set the cursor while it is in a window, make sure the class cursor for the specified window's class is set to NULL. If the class cursor is not NULL, the system restores the class cursor each time the mouse is moved.

The cursor is not shown on the screen if the internal cursor display count is less than zero. This occurs if the application uses the ShowCursor function to hide the cursor more times than to show the cursor.

Windows CE: Use the cursor component when targeting a platform that does not support mouse cursors. The only cursor this component supports is the wait cursor. Use the following code to set the wait cursor:

SetCursor(LoadCursor(NULL, IDC_WAIT));
Use the mcursor component when targeting a platform that does support mouse cursors. This component does not support color cursors.

Best regards,
Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

kfaday13-Jun-04 7:08

13-Jun-04 7:08

I've read this kind of tutorial in msdn:
<url=http: msdn.microsoft.com="" library="" default.asp?url="/library/en-us/winui/WinUI/WindowsUserInterface/Resources/Cursors/UsingCursors.asp">http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/WinUI/WindowsUserInterface/Resources/Cursors/UsingCursors.asp

I'm doing an mfc app, and that seems winampi, but i tried to implement what's there anyways.

first of all, in my dialog class i've got these member variables

HINSTANCE hinst;
HCURSOR hCursor;

In the constructor of the dialog i've got:

hCursor = LoadCursor(hinst, MAKEINTRESOURCE(IDC_LAPIZ_CUR));

then i've got this:

BOOL CVentanaPizarra::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
{
	if (changecursor==true)
    { 
        SetCursor(hCursor); 
    } 
	return CDialog::OnSetCursor(pWnd, nHitTest, message);
}

so, when i press a button, the changecursor variable is set to true.

But it still doesn't show the cursor when i press that button
what am i doing wrong?

Johan Rosengren13-Jun-04 9:55

Johan Rosengren

13-Jun-04 9:55

kfaday wrote:
hCursor = LoadCursor(hinst, MAKEINTRESOURCE(IDC_LAPIZ_CUR));

Ouch. You are not initializing hinst to the application instance handle.
Rewrite to:

hCursor = LoadCursor(AfxGetResourceHandle(), MAKEINTRESOURCE(IDC_LAPIZ_CUR));

kfaday wrote:

BOOL CVentanaPizarra::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
{
  if (changecursor==true)
  {
    SetCursor(hCursor);     
  }

  return   CDialog::OnSetCursor(pWnd, nHitTest, message);
}

what am i doing wrong?

You are calling the base class implementation in OnSetCursor. Rewrite to:

BOOL CVentanaPizarra::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
{
  BOOL result = TRUE;
  if (changecursor==true)
  {
    if( SetCursor(hCursor) )
      result = TRUE;
  }
  else
    result = CDialog::OnSetCursor(pWnd, nHitTest, message);

  return result;
}

kfaday13-Jun-04 10:29

13-Jun-04 10:29

thank you very much for your help!!
it worked!

Debug Assertion Failed, what the f****????

Johan Rosengren13-Jun-04 19:46

Johan Rosengren

13-Jun-04 19:46

My pleasure Smile | :)

Anonymous13-Jun-04 3:43

Anonymous

13-Jun-04 3:43

Hi guys,

I've written a very simple chat/message-application, when I compiled it I had no errors and even no warnings. So I thought my application is ready to execute and than the hell breaks out! Mad | :mad:

It is very frustrating Eek! | :eek:

, first I had 120 errors or more, than I reduced to 0 Cool | :cool:

, so I thought now my application is ready to start than I got the message: Debug Assertion Failed WTF | :WTF:

. I could choose to break, again, or ignore. Dead | X|

Can anybody help me please Cry | :((

? I don't know what that message mean and what went wrong.

Come on guys you can do it, you helped me out once before and I'm sure you can do it again now!

(I'm sorry for my bad English, I'm from Holland and my dutch is worse Blush | :O

)

Peace!!

valikac13-Jun-04 5:53

valikac

13-Jun-04 5:53

Where does the assertion occur?

Kuphryn

Anonymous13-Jun-04 6:54

Anonymous

13-Jun-04 6:54

Hi Kuphryn

The assertion failure occurs when I try to execute my application. I mean execute from Visual C++ (6.0), than I get a dialogbox with "Debug Assertion Failed"

So I hope can help me my friend Sigh | :sigh:

Tim Smith13-Jun-04 9:58

Tim Smith

13-Jun-04 9:58

Try debugging your software. Look at the line of code that generated the assert. Usually they will document what the problem is or it will be obvious looking at the source.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Johan Rosengren13-Jun-04 10:00

Johan Rosengren

13-Jun-04 10:00

If you press 'Abort' (or whatever that might be in Dutch Smile | :)

), the debugger will stop at the ASSERT in the MFC source code. More often than not, there will be a comment giving the reason for the problem. ASSERTs are a way for the code telling that some condition is not fullfilled at this point of the execution.

BTW, a clean compile does in no way mean you have an even mildly runnable program, only that the compiler and linker successfully converted your instructions to a binary file. This has the implication that you will have to test your application after it is written, something that comes as a surprise to many developers, newbies and experiences alike Smile | :)