C / C++ / MFC Discussion Boards

Re: BSTR (char * ) and MSXML basic question...

Braulio Dez23-Apr-02 20:53

23-Apr-02 20:53

Thanks for the tip,

Sorry, I forgot to write there the type of strCostSelNode, and it was "CComBSTR".

Anyway is a perfect example for me, if I have to convert from all that types to BSTr, thanks a lot.

Braulio

PS.: If I declare a variable in MFC using _bstr_t, do I need to free it, before it goes out of scope ?, b.g.:

void MyMethod()
{
  _bstr_t MyVar = "MyText";
  (...) 
  // Memory Leakage when it goes out of scope or self destructed ?  
}

CFontDialog

Tzoockee23-Apr-02 4:15

Tzoockee

23-Apr-02 4:15

I want to display the CFontDialog dialog with the DoModal() method, but the font and it's properties (size, style, colour) already selected.
For example when the dialog is displayed, the Arial 12 italic RED is selected.
How do I do that ?

Re: CFontDialog

Niklas L23-Apr-02 5:00

Niklas L

23-Apr-02 5:00

After you've created you dialog, but before DoModal(), modify the m_cf member of your dialog. Set m_cf.Flags to CF_INITTOLOGFONTSTRUCT and m_cf.lpLogFont to point to a LOGFONT object of your choice.
You can use CFont::CreateFont() to initialize a font, and then use CFont::GetLogFont() to get the underlying LOGFONT.

Re: CFontDialog

Tzoockee23-Apr-02 7:17

Tzoockee

23-Apr-02 7:17

I have tried like you told me:

CFontDialog dlg;
LOGFONT* logf;
logf=new LOGFONT;
font1.GetLogFont(logf); //font1 is a valid font created before (Arial 12)
dlg.m_cf.Flags=CF_INITTOLOGFONTSTRUCT;
dlg.m_cf.lpLogFont=logf;
dlg.DoModal();

It doesn't work. I get an assertion failure at the DoModal method. If I debug it, the error is at the line:

ASSERT(m_cf.Flags & CF_ENABLEHOOK); in the CFontDialog::DoModal method, defined in dlgfnt.cpp.

If I don't debug it and I choose Ignore, It says: "There are no fonts installed. Go to the Control Panel.......".

What is the problem ?
Confused | :confused:

Re: CFontDialog

Tzoockee23-Apr-02 8:37

Tzoockee

23-Apr-02 8:37

it's ok. I resolved that. I had to set also the flags CF_ENABLEHOOK | CF_BOTH | CF_EFFECTS.

Thanks.

Re: CFontDialog

Niklas L23-Apr-02 23:54

Niklas L

23-Apr-02 23:54

It should be set like:

dlg.m_cf.Flags |= CF_INITTOLOGFONTSTRUCT;<code><br />
to keep old flag values.<br />
<br />
Your solution will probably work aswell.

Location of cursor resources

Tom Archer23-Apr-02 3:36

Tom Archer

23-Apr-02 3:36

Does anyone remember where the standard cursor resources (such as IDC_SIZEALL) are located (which file)?

Cheers,
Tom Archer
Author, Inside C#

Please note that the opinions expressed in this correspondence do not necessarily reflect the views of the author.

Re: Location of cursor resources

Joaquín M López Muñoz23-Apr-02 3:42

Joaquín M López Muñoz

23-Apr-02 3:42

I'd say they are in shell32.dll.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Location of cursor resources

moliate23-Apr-02 18:21

moliate

23-Apr-02 18:21

Not sure, but I'd go for the mfc dlls.

/moliate

Re: Location of cursor resources

Tom Archer23-Apr-02 22:45

Tom Archer

23-Apr-02 22:45

Something like that is definitely going to be in one of the Windows DLLs. I just didn't want to have to manually open each one and search through its resources. Thanks anyway!

Cheers,
Tom Archer
Author, Inside C#

Please note that the opinions expressed in this correspondence do not necessarily reflect the views of the author.

Re: Location of cursor resources

moliate24-Apr-02 2:37

moliate

24-Apr-02 2:37

USER32.DLL, then...

Guess you already found it, though.

/moliate

Re: Location of cursor resources

Tom Archer24-Apr-02 2:44

Tom Archer

24-Apr-02 2:44

Yeah

But thanks! Smile | :)

Cheers,
Tom Archer
Author, Inside C#

Please note that the opinions expressed in this correspondence do not necessarily reflect the views of the author.

monochrome bitmap

Niklas L23-Apr-02 3:31

Niklas L

23-Apr-02 3:31

Is there a simpel way to create a monochrome bitmap from a multicolor bitmap?
I need to create a mask for MaskBlt. This mask should be monochrome according to MSDN. Assuming only one color will apply to 1 and the rest to 0 in the mask.

Any help would be appreciated.

Re: monochrome bitmap

l a u r e n23-Apr-02 5:06

l a u r e n

23-Apr-02 5:06

are u meaning at runtime or design time?

situations to avoid #37:
"good morning ... how many sugars do you take in your coffee ... and what was your name again?"

coming soon: situations to avoid #38: "...and the dog was there too?"

Re: monochrome bitmap

Niklas L23-Apr-02 22:35

Niklas L

23-Apr-02 22:35

Thanks, I did mean at runtime.

Re: monochrome bitmap

Mike Nordell23-Apr-02 9:54

Mike Nordell

23-Apr-02 9:54

The sample is in MSDN. Try looking for "transblt", "transblit" or something like that.

Re: monochrome bitmap

Niklas L23-Apr-02 22:37

Niklas L

23-Apr-02 22:37

Roger.

TransparentBlt(), Thanks.

Re: monochrome bitmap

Christian Graus23-Apr-02 10:08

Christian Graus

23-Apr-02 10:08

At www.wdj.com they have my Sept 2001 article online, which does exactly this to draw a bitmap with color keying, which is what I presume you want to do.

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

And you don't spend much time with the opposite sex working day and night, unless the pizza delivery person happens to be young, cute, single and female. I can assure you, I've consumed more than a programmer's allotment of pizza, and these conditions have never aligned. - Christopher Duncan - 18/04/2002

Re: monochrome bitmap

Niklas L23-Apr-02 22:27

Niklas L

23-Apr-02 22:27

Thanks for your reply. I came up with some unexpected results regarding timing of the calls during a profiling.
I tried four different methods to draw an ellipse. The first method is obviously direct, the following three uses precreated bitmaps or icons.
I put them in a loop and:

% of time spent	call
18,91	pDC->Ellipse(...)
19,58	pDC->DrawState(...)
12,89	pDC->DrawIcon(...)
35,59	pDC->MaskBlt(...)

MaskBlt didn't at all perform as I expected. Do you have any clue to why?
(One reason could be the size of the drawings. The actual ellipse drawn has a radius of 3, while the icons and bitmaps I used was of size 32 by 32 including the ellipse, still sized with a radius of 3)
(I used your method to create a monochrome bitmap.)

Christian Graus wrote:
At www.wdj.com they have my Sept 2001 article online

BTW, is there any site where you don't post articles? I bet a search on AltaVista for NOT "Christian Graus" will give me no hits at all Wink | ;)

Re: monochrome bitmap

Niklas L23-Apr-02 22:31

Niklas L

23-Apr-02 22:31

Hoho, that was some nice formatting Smile | :)

It should have read:

Thanks for your reply. I came up with some unexpected results regarding timing of the calls during a profiling.
I tried four different methods to draw an ellipse. The first method is obviously direct, the following three uses precreated bitmaps or icons.
I put them in a loop and:

(Skipping <table> fancy stuff this time)

% of time spent   call
  18,91           pDC->Ellipse(...)
  19,58           pDC->DrawState(...)
  12,89           pDC->DrawIcon(...)
  35,59           pDC->MaskBlt(...)

IXMLDOMDocument/node question

Christian Graus23-Apr-02 3:17

Christian Graus

23-Apr-02 3:17

I have been at work for 15 hours, and I'm stuck on this - it used to work but now doesn't. Basicaaly I have an XMLDocument and it has a set of child nodes in a NodeListPtr, which I want to copy into another document, so I set through them all and use appendChild to copy them to the other document, and cloneNode(VARIANT_TRUE) to make sure I put in a deep copy. It now blows up on the appendChild call, every time that the node has come from another parent document. The docs seem to say I *can* do this, I'm sure I *have* done this ( this is old code that just stopped working ), so can anyone tell me where I am going wrong ?

The code looks something like this:

IXMLDOMNodeListPtr ptList = spDoc1->FindNode("/XML/blah"); // works OK

IXMLDOMNodePtr ptOther = spDoc2->CreateNode("/XML/location"(; // Works OK

while (ptNode = ptList->nextNode()) // works OK
{
ptCopy = ptNode->cloneNode(VARIANT_TRUE); // works OK
ptOther->appendNode(ptCopy); // This blows up, no matter how I slice & dice it
}

This is a rough idea, but the lines marked with 'works OK' work, if there's any error in my post, it's not present in my code.

Thanks.

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

And you don't spend much time with the opposite sex working day and night, unless the pizza delivery person happens to be young, cute, single and female. I can assure you, I've consumed more than a programmer's allotment of pizza, and these conditions have never aligned. - Christopher Duncan - 18/04/2002

Re: IXMLDOMDocument/node question

Joaquín M López Muñoz23-Apr-02 3:34

Joaquín M López Muñoz

23-Apr-02 3:34

Hi Chris, this is a shoot in the dark, so I hope I won't hurt anybody. Could it be that ptCopy is not implementing OK the AddRef/Release stuff? Why don't you try using a local variable?

while (ptNode = ptList->nextNode()) // works OK
{
IXMLDOMNodePtr ptCopy = ptNode->cloneNode(VARIANT_TRUE); // works OK
ptOther->appendNode(ptCopy); // This blows up, no matter how I slice & dice it
}

I doubt this will fix the problem, but it is easy to give a try.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Invalidate method

Rajveer23-Apr-02 2:57

Rajveer

23-Apr-02 2:57

I'm drawing graphics with OpenGL in an MDI application. In my OnDraw() function, I have the following portion of code:

if(spin==1)
{
Y_Angle++;
Invalidate(TRUE);
}

I have a button which makes spin=1. So when I press this, Y_Angle will continue to increment and then Invalidate(TRUE) redraws the scene each time, giving the appearance of continuous rotation. This works fine. Problem is, when I click any menu thats supposed to bring up a dialog box, the box doesn't come up. I have a feeling this has something to do with Invalidate(TRUE) continuously redrawing the scene. How can I fix this?

Re: Invalidate method

Joaquín M López Muñoz23-Apr-02 3:07

Joaquín M López Muñoz

23-Apr-02 3:07

First of all, I'll make sure it is the continuous calling to Invalidate that is causing the problem. To determine this, simply comment the call out and check if the dialog box appears now.
Assumming that is indeed the problem, try setting a timer and calling Invalidate there. Check Nemanja Trifunovic's Timers tutorial for further info on timers.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Novell

Brian Delahunty23-Apr-02 2:40

Brian Delahunty

23-Apr-02 2:40

Don't know if this should be in the Operating Systems area but I was just wondering if anybody knows how to get the username of the person logged on a machine on a novell network. Hmmm | :|

Basically I'm making a program that I only want a number of people I know to be able to use [chances are it will be distributed without my knowledge] and the program will only be run on my college network [running mainly win2k machines on a novell network]. So i want to be able to read the username of the person logged in an compare this against a list of allowable usernames [probably private data members or in a struct somewhere] within the program.

Any help greatly appreciated.

dela

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