Weird Problem! Please Help - C / C++ / MFC Discussion Boards

Re: SHGetSpecialFolder problem with Win98

Abin9-Sep-03 14:02

9-Sep-03 14:02

Yes, this folder is always in English. Only folders that will be in other languages are, as far as I know, "Desktop" and "Startup".

Re: SHGetSpecialFolder problem with Win98

David Crow9-Sep-03 9:57

David Crow

9-Sep-03 9:57

For CSIDL_LOCAL_APPDATA and CSIDL_WINDOWS, you must have v5 of the common controls DLL. What version of Internet Explorer does the Windows 98 machine have?

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Windows hooks and TranslateMessage function

mannelig9-Sep-03 8:32

mannelig

9-Sep-03 8:32

When I've tried to catch keyboard messages with SetWindowsHookEx(WH_KEYBOARD, KbHookingProc, hinstDll, 0), I've noticed, that only WM_KEYDOWNs are hooked.

It means that, as I make an attempt to send the message to my primary thread of execution like this:

LRESULT CALLBACK KbHookingProc(int code, WPARAM wParam, LPARAM lParam)<br />
{<br />
	if (code < 0) goto ret;<br />
<br />
        UINT uMsg = (lParam & KF_UP) ? WM_KEYUP : WM_KEYDOWN;<br />
<br />
	PostThreadMessage(ThreadId, uMsg, wParam, lParam);<br />
<br />
ret:<br />
<br />
	return CallNextHookEx(hhook, code, wParam, lParam);<br />
};

I recieve only WM_KEYDOWN messages.

So, when my primary thread tries to translate such re-sent messages, TranslateMessage doesn't work (I suppose, it depends on WM_KEYUP in some way, but I'm not sure).

Re: Windows hooks and TranslateMessage function

Joseph Marzbani15-Sep-08 3:22

Joseph Marzbani

15-Sep-08 3:22

Hi buddy
I've been searching for such a thing, but could NOT find a solution.
I thought likely you can suggest something sice you are older Laugh | :laugh:

Thanx in advance and here's my eMail: Marzbany@yMail.com

VC.Net Debugging

Dave Loeser9-Sep-03 7:58

Dave Loeser

9-Sep-03 7:58

I have been looking for a method to prevent the debugger from stepping into functions/class methods that I do not wish it to enter. This was available in VC 6 - is it availble with VS.Net 2003?

Thanks

Dave Dak Lozar Loeser
When access is allowed to a member, it said to be accessible. Otherwise, it is inaccessible. - MSDN:C# Programmer's Reference

MS Access and datetime picker

Steve Messer9-Sep-03 7:57

Steve Messer

9-Sep-03 7:57

Hi all,

My problem is that I am writing an application using ODBC to connect to an Access database. I have since found out that the there is a problem putting a datetime object into this database.
I found an article at Codeguru... which does fix that problem but on to my current problem. When I enter in a Date Time with the DateTimeCtrl then I advance to the next record or any record and it continues stuffing my original selection into every record.

Thanks,

Steve

Re: MS Access and datetime picker

Steve Messer9-Sep-03 22:11

Steve Messer

9-Sep-03 22:11

Nevermind I figured it out.

Thanks anyways.

Steve

Weird Problem! Please Help

Binayak9-Sep-03 7:47

Binayak

9-Sep-03 7:47

Hi,

I have an editable CTreeCtrl, in the function OnEndlabeleditTree() I decide whether I would save the change or, not. The problem is at the end of the function I check the ItemText of the edited label and it always remains unchanged although the label actually changes. Please tell me how I can actually reflect the change in the program. Here is the code:

void CGeneratorView::OnEndlabeleditTree(NMHDR* pNMHDR, LRESULT* pResult)
{
TV_DISPINFO* pTVDispInfo = (TV_DISPINFO*)pNMHDR;
HTREEITEM hItem = pTVDispInfo->item.hItem;
CEdit* pEdit = m_TreeCtrl1.GetEditControl();
CString str;
pEdit->GetWindowText(str);
if (str.IsEmpty())
{
MessageBox("Please enter a valid Label!");
*pResult = FALSE;
return;

}
else
{
*pResult = TRUE;
}
m_TreeCtrl1.SelectItem (hItem);
MessageBox (m_TreeCtrl1.GetItemText(hItem));
}

Re: Weird Problem! Please Help

igor19609-Sep-03 9:23

igor1960

9-Sep-03 9:23

From what I understood OnEndlabeleditTree() get's after edit finished, but before actual tree item changed. Therefore, your MessageBox (m_TreeCtrl1.GetItemText(hItem));
inside OnEndlabeleditTree()is premature.
You may use your str at this point, however if you expect item text to be changed somewhere and really want to figure out what text should be -- post User Message to yourself and MessageBox items text in it's handler.

"...Ability to type is not enough to become a Programmer. Unless you type in VB. But then again you have to type really fast..."
Me

Re: Weird Problem! Please Help

Binayak9-Sep-03 10:15

Binayak

9-Sep-03 10:15

igor1960 wrote:
post User Message to yourself and MessageBox items text in it's handler.

please explain the above statement

Re: Weird Problem! Please Help

igor19609-Sep-03 11:52

igor1960

9-Sep-03 11:52

Instead of yours:

m_TreeCtrl1.SelectItem (hItem);<br />
MessageBox (m_TreeCtrl1.GetItemText(hItem));

Do the following for example:

PostMessage(WM_APP+1, (WPARAM)hItem, 0L);

Now, create WindowProc handler if you don't have already, and put the following code there:

LRESULT CYourWnd::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <br />
{<br />
	if(message == WM_APP+1)<br />
	{<br />
              MessageBox (m_TreeCtrl1.GetItemText((HITEM)wParam));<br />
        }<br />
...

"...Ability to type is not enough to become a Programmer. Unless you type in VB. But then again you have to type really fast..."
Me

unable to include Excel

act_x9-Sep-03 7:12

act_x

9-Sep-03 7:12

I am working on a Vc++ Dialog app with ATL support .

I needed some functionality from Excel and started following :
HOWTO: Create Automation Project Using MFC and a Type Library
ID: Q178749

i get the following errors

ApplicationDev\Cam\CamProgrammer\excel8.h(9228) : error C2011: '_Application' : 'class' type redefinition<br />
C:\ApplicationDev\Cam\CamProgrammer\excel8.h(9511) : error C2011: 'Sheets' : 'class' type redefinition<br />
C:\ApplicationDev\Cam\CamProgrammer\excel8.h(9546) : error C2011: '_Worksheet' : 'class' type redefinition

what is wrong ? Please advise

Re: unable to include Excel

David Crow9-Sep-03 7:26

David Crow

9-Sep-03 7:26

Where is the #include < excel8.h > statement?

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Re: unable to include Excel

act_x9-Sep-03 8:14

act_x

9-Sep-03 8:14

it is there in the projectDlg.h file

Re: unable to include Excel

David Crow9-Sep-03 8:16

David Crow

9-Sep-03 8:16

It should go in the stdafx.h file.

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Re: unable to include Excel

act_x9-Sep-03 8:17

act_x

9-Sep-03 8:17

Plus using classwizard I am not adding all the zillion classes within Excel . I am adding the classes that I need . Would that be a problem ?

char * to VARIANT

act_x9-Sep-03 6:29

act_x

9-Sep-03 6:29

i am doing some Excel automation stuff and needed to convert a char * to a VARIANT

SysAllocString needs a unsigned short * which doesnt convert correctly from a char *

Is there a function that will allow me to assign a char * value to a VARIANT ?

Re: char * to VARIANT

Miszou9-Sep-03 6:41

Miszou

9-Sep-03 6:41

Take a look at the _variant_t wrapper class.

How to take the address of a smart pointer?

Miszou9-Sep-03 6:16

Miszou

9-Sep-03 6:16

I need to pass a pointer to a _com_ptr_t object (as created by the #import directive), but I can't take the address of it, since the & operator is overriden by the class to return the underlying interface pointer.

eg:

void f( ADODB::_RecordsetPtr *pRs1, ADODB::_RecordsetPtr *pRs2 )
{
    if ( NULL != pRs1 )
    {
        // Create, open and do something with recordset
    }

    if ( NULL != pRs2 )
    {
        // Create, open and do something with recordset
    }
}
 
ADODB::_RecordsetPtr pRs;
f( &pRs, NULL ); // This line is rejected by compiler

Yes, I can pass it by reference, but I want a pointer since the object is allowed to be NULL if it is not required.

Any ideas?

Thanks!

Re: How to take the address of a smart pointer?

antlers9-Sep-03 6:58

antlers

9-Sep-03 6:58

Always pass smart pointers by value; it's cheap and that is what they are there for. You can test the smart pointer for NULL just like a regular pointer: if it hasn't been set to anything, converting to bool will return false. (you can just use

if ( ptr )

which implicitly converts to bool)

Re: How to take the address of a smart pointer?

Miszou9-Sep-03 7:13

Miszou

9-Sep-03 7:13

Wait a second, I think a light just came on in my head... D'Oh! | :doh:

I need to CreateInstance on the pointers that I need and then pass those to my function. Any pointers that have not had CreateInstance called on them will be false, so I know I cannot use them...

Hmmm... that will work, but I was hoping to be able to get my function to call CreateInstance on the smart pointer if it was not NULL, thereby creating it for me.

Thanks for the insight! Smile | :)

Template function in a class

ns9-Sep-03 5:50

9-Sep-03 5:50

I am porting a C++ app written on Unix over to Windows using VS. It balks at a function declared and defined in the h file:

template <class T>
T *
s_file::port_data (unsigned int line) {
  return ((T *) _port_data + line * _port_samples);
}

I am going to have to write overloaded functions to replace this, but is there a simpler resolution? Apparently VC does not like a template fn embedded in a class ?? Confused | :confused:

Thanks,

Appreciate your help,
ns

Re: Template function in a class

geo_m9-Sep-03 7:02

geo_m

9-Sep-03 7:02

try to resend it and watch for < and >, you're in HTML Wink | ;-)

Which VC you use for the compilation, the VC6 have only limited support for templates, VC2003 (7.1) supports nearly all features.

I normally used template functions in a class, so there shouldn't be a problem (VC7.0 and 7.1)

Re: Template function in a class

Alvaro Mendez9-Sep-03 7:37

Alvaro Mendez

9-Sep-03 7:37

The < > signs in your post were swallowed by HTML. Modify your post and click on the "Do not treat ..." checkbox.

Also, exactly what error message(s) are you getting?

Regards,
Alvaro

Hey! It compiles! Ship it.

Re: Template function in a class

ns9-Sep-03 8:37

9-Sep-03 8:37

Sorry:

template  <class T > T *  s_file::port_data (unsigned int line) {    return ((T *) _port_data + line * _port_samples);  }

THe compiler complains that this function port_data has not been declared (though this inline is in the .h file....).
Thanks

ns

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