C / C++ / MFC Discussion Boards

Michael Dunn2-Oct-02 19:20

2-Oct-02 19:20

Daaave wrote:
How do I create a CFont object for that font?

You can't. "MS Shell Dlg" is not a real font; it is a special name recognized only by the OS code that parses dialog templates. To get the font used for dialogs, call GetStockObject(DEFAULT_GUI_FONT)

--Mike--
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Re: MS Shell Dlg Font

Daaave2-Oct-02 19:40

Daaave

2-Oct-02 19:40

Sweet thanks man Big Grin | :-D

Getting absolute URL from relative

Alex Cramer2-Oct-02 18:32

Alex Cramer

2-Oct-02 18:32

I have a Web Browser control and want to download external files like images, *.css, *.js and etc.

The SRC attribute of <IMG> <LINK> <SCRIPT> can contains absolute and relative URLs. How to correctly obtain full URL for these files? May be there is a ready system function to download such files? I tried URLDownloadToFile, may be I must try URL monikers?

Thanks!

Re: Getting absolute URL from relative

Stephane Rodriguez.2-Oct-02 22:13

Stephane Rodriguez.

2-Oct-02 22:13

window.location.href is the actual URL. Just parse this, and add your resource name.

sometimes it helps to look at the IL generated code
a MS guy on develop.com "answering" .NET issues

Whats the equivalent of CString.m_pchData in VS.NET?

Alvaro Mendez2-Oct-02 17:54

Alvaro Mendez

2-Oct-02 17:54

Well, I finally got a hold of Visual Studio .NET and now I'm trying to rebuild my DLLs which contain a bunch of MFC-based classes. I'm getting tons of errors, the first of which I don't have a solution for.

I have a string class which derives from CString and uses the old m_pchData protected member from 6.0. So now since apparently it's no longer in CString, I get a 'm_pchData' : undeclared identifier error.

What should I do? My class needs the equivalent of this member variable.

Thanks,
Alvaro

Insanity: doing the same thing over and over again and expecting different results. - Albert Einstein

Re: Whats the equivalent of CString.m_pchData in VS.NET?

Alex Cramer2-Oct-02 18:59

Alex Cramer

2-Oct-02 18:59

What there used instead?

Re: Whats the equivalent of CString.m_pchData in VS.NET?

Stephane Rodriguez.2-Oct-02 22:21

Stephane Rodriguez.

2-Oct-02 22:21

Unfortunately the MFC7 CString uses STL : typedef ATL::CStringT< TCHAR, StrTraitMFC< TCHAR > > CString;.

You may just as well extract the CString implementation from the MFC6 classes.
(afx.h + strcore.cpp)

sometimes it helps to look at the IL generated code
a MS guy on develop.com "answering" .NET issues

Re: Whats the equivalent of CString.m_pchData in VS.NET?

Jon Hulatt3-Oct-02 2:23

Jon Hulatt

3-Oct-02 2:23

why were you trying to use a protected member?

for read, CString has an LPCTSTR operator, and for write you can GetBuffer() to get an LPTSTR pointer. You should use those, because that is the designed interface of CString.

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Discover Shell Extension Verbs

Paul Farry2-Oct-02 17:05

Paul Farry

2-Oct-02 17:05

Hi,

I've got direct CD installed on an SOE environment, and I would like to automate the formatting of CDRW's using the tool provided, but it looks like it's a shell extension.

Has anyone got any snippets of code which demonstrate the capture of a shell extensions function??

OR .

Is there a better way to format these discs.. I've looks at the UDF article here, but the app just doesn't seem to want to work with these disks/writers.

Please help

Release version crashes

Anonymous2-Oct-02 14:40

Anonymous

2-Oct-02 14:40

hey all, in my message map i catch and process ON_MESSAGE(WM_SETCURSOR, onSetCursor) and all the onSetCursor does is this:
if (waitCursor)
SetCursor(LoadCursor(NULL, IDC_APPSTARTING));
else
SetCursor(LoadCursor(NULL, IDC_ARROW));
when compiled in debug version everything works fine, but when compiled in release mode whenever the mouse goes over the app, therefor calling WM_SETCURSOR the program just crashes. Anyone got any ideas on how to fix this? thanks

Luke.

Re: Release version crashes

Anonymous2-Oct-02 14:54

Anonymous

2-Oct-02 14:54

Sorry i forgot to mention that when i comment out ON_MESSAGE(WM_SETCURSOR, onSetCursor) release mode works fine and that why i'm pretty sure that it is that stuffing it up.

Luke.

Re: Release version crashes

Dave Bryant2-Oct-02 15:47

Dave Bryant

2-Oct-02 15:47

Change ON_MESSAGE to ON_WM_SETCURSOR. The OnSetCursor handler must have the prototype BOOL OnSetCursor(CWnd*, UINT, UINT), whereas ON_MESSAGE describes a handler that has a prototype LRESULT MyHandler(WPARAM, LPARAM).

When the function is called, it is expecting a different number of parameters, and so the stack is getting screwed up - because of the different ways that the stack is managed in debug and release modes, this generally only shows up in a release build.

Dave

Re: Release version crashes

Anonymous2-Oct-02 16:48

Anonymous

2-Oct-02 16:48

thanks that stoped it from crashing at startup, but now it works fine but when i exit the program then it brings up the this program has crashed message. any ideas?

Luke.

Sorting listboxes descending

monrobot132-Oct-02 13:35

monrobot13

2-Oct-02 13:35

I know you can sort listboxes ascending with the LBS_SORT style but is there anyway to sort them descending?

Thanks.

- monrobot13

Re: Sorting listboxes descending

Ravi Bhavnani2-Oct-02 13:50

Ravi Bhavnani

2-Oct-02 13:50

There's a "descending" style you can use. Not sure what it is, but you can find it out by selecting "descending" in the resource editor and looking at the .rc file.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: Sorting listboxes descending

monrobot132-Oct-02 16:41

monrobot13

2-Oct-02 16:41

As far as what I've seen (I just checked the resource editor) you can only select a descending order in a CListCtrl, but I haven't seen anything for a CListBox. If there isn't one that's just fine but if there is that would be great.

- monrobot13

Re: Sorting listboxes descending

Ravi Bhavnani3-Oct-02 4:59

Ravi Bhavnani

3-Oct-02 4:59

Argh! I need more sleep! Sorry, I was thinking CListCtrl. Hmm, now that it's been mentioned, why not use it instead of CListBox? Smile | :)

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: Sorting listboxes descending

monrobot133-Oct-02 13:26

monrobot13

3-Oct-02 13:26

Ravi Bhavnani wrote:
Hmm, now that it's been mentioned, why not use it instead of CListBox?

To tell the truth I'm not really sure of the difference between the two so I just chose the listbox since all I need to do is display a list of items.

- monrobot13

Re: Sorting listboxes descending

Ravi Bhavnani3-Oct-02 15:26

Ravi Bhavnani

3-Oct-02 15:26

A CListCtrl is a much more powerful form of CListBox. I prefer it over the circa Windows 3.1 list box implementation.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: Sorting listboxes descending

monrobot135-Oct-02 8:39

monrobot13

5-Oct-02 8:39

Alright I guess I'll switch the conrol over to a CListCtrl

Thanks!

- monrobot13

Re: Sorting listboxes descending

Debs3-Oct-02 0:00

Debs

3-Oct-02 0:00

I'm not aware of any in MFC6. If you want anything other than the default sort (i.e. alphabetic, ascending), then you need to implement an owner drawn list box and write a custom OnCompareItem method.

Re: Sorting listboxes descending

monrobot133-Oct-02 2:17

monrobot13

3-Oct-02 2:17

Alright sounds good. Thanks for the info.

- monrobot13

CListBox WM_MEASUREITEM problems

alex.barylski2-Oct-02 13:34

alex.barylski

2-Oct-02 13:34

How can I can force the control to send itself a WM_MEASUREITEM message each time it is resized...?

Currently default implementation only fires off a WM_MEASUREITEM at the time of creation and thats it...I need it to fire whenever the control is resized...???

I have the following code (from which I stole from Changing Row Height in an owner drawn Control
By Uwe Keim ) inside my CListBox::OnSize()

CListBox::OnSize(nType, cx, cy); 
		
// Prepare control for custom WM_MEASUREITEM
CRect rc;
GetWindowRect( &rc );

WINDOWPOS wp;
wp.hwnd  = m_hWnd;
wp.cx    = rc.Width();
wp.cy    = rc.Height();
wp.flags = SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOOWNERZORDER | SWP_NOZORDER;

// Force control to receive WM_MEASUREITEM on resizes
SendMessage( WM_WINDOWPOSCHANGED, 0, (LPARAM)&wp );

// Redraw display
Invalidate(FALSE);

However when the code executes I get an exception:

First-chance exception in Timeline2.exe (KERNEL32.DLL): 0xC00000FD: Stack Overflow.

Any ideas as to why this is happening...? Or atleast another way of forcing the control to receive WM_MEASUREITEM on control resizes...?

Thanx a million!

Cheers! Smile | :)

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: CListBox WM_MEASUREITEM problems

Shog⁹2-Oct-02 14:18

Shog⁹

2-Oct-02 14:18

Well, you'll keep recursing if you send yourself WM_WINDOWPOSCHANGED, as it will trigger OnSize() to be called again, which will send the message again, etc. etc.

What's worked well for me in the past is not bothering with triggering additional WM_MEASUREITEM messages. Instead, move the code from WM_MEASUREITEM into a generic routine (say, CalcItemHeight()) that will calculate the size of an item. Call this routine from WM_MEASUREITEM, and then also loop in OnSize() , calling CalcItemHeight() and SetItemHeight() (non-MFC: LB_SETITEMHEIGHT) for each item.

Example:

void CCustomListBox::OnSize(UINT nType, int cx, int cy) 
{
   SetRedraw(FALSE);
 
   // recalc height for all items.
   const int nCount = GetCount();
   for (int i = 0; i < nCount; i++)
   {
      int nHeight = CalcItemHeight(i, cx);
      SetItemHeight(i, nHeight);
   }
 
   SetRedraw(TRUE);
   Invalidate(FALSE);
 
   CListBox::OnSize(nType, cx, cy);
}

Shog⁹
~~------~~
Crazy lady with the shiny shoes, where are you?
Kick your feet and calm the space that makes you hollow

Live, Insomnia And The Hole In The Universe

Re: CListBox WM_MEASUREITEM problems

alex.barylski2-Oct-02 19:59

alex.barylski

2-Oct-02 19:59

Hey Shog I haven't really read your answer fully, but I have full confidence in your answer, so again I give you my thanx!!!

I really appreciate this one...not that I didn't appreciate past help, but this makes a huge difference in my control for user friendliness and I just got sooo Mad | :mad:

trying to figure out what was going on...you've saved me countless hours of grief here.

Thanx again!!! Smile | :)

Cheers!

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

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