C / C++ / MFC

How do i at runtime, draw a bitmap in my application?

4-Nov-02 10:11

Is there any reason this shouldn't work on 9x machines? It displays fine on my 2k machine but not on 98..

void CStatusBarEx::OnContextMenu(CWnd* pWnd, CPoint point) 
{
	if( point.x == -1 && point.y == -1 )
	{
		CRect	rect;		
		GetClientRect(rect);
		ClientToScreen(rect);	
		point = rect.TopLeft();	
		point.Offset(5, 5);
	}

	CMenu	menu;
	menu.LoadMenu(IDR_STATUS_BAR);

	CMenu* pPopup = menu.GetSubMenu(0);	

	CWnd* pWndPopupOwner = this;
	while(pWndPopupOwner->GetStyle() & WS_CHILD)
		pWndPopupOwner = pWndPopupOwner->GetParent();

	pPopup->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, 
		point.x, point.y, pWndPopupOwner);
}

Anonymous4-Nov-02 9:45

Re: How do i at runtime, draw a bitmap in my application?

4-Nov-02 9:45

thanks all!

Christian Graus4-Nov-02 9:56

4-Nov-02 9:56

This is the sort of question you should look to MSDN for an answer. All you're asking is how do I use pens and brushes on a bitmap, and there is plenty of documentation on that to go around.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002

yes

Anonymous4-Nov-02 10:31

4-Nov-02 10:31

i've tried doing it from the examples in MSDN, but it's not working, so i wanted to see how you do it.

Re: yes

Christian Graus4-Nov-02 11:06

Do we really need "UINT mask"?

4-Nov-02 11:06

OK - some advice:

1. If you want to be taken seriously, try getting an account instead of posting anonymously. I obviously have answered anyhow, but a lot of people don't.

2. Seeing as everything I do with GDI I learned from MSDN, it's obvious you're doing something wrong. Any code I write seems as likely to cause you trouble as the MSDN samples. Posting some code would both show that you've tried to do it for yourself ( as opposed to just coming here and trying to be spoon fed ), and would also encourage people to help you. More importantly, it would mean that we could quickly tell you what you've done wrong instead of having to type up full examples for your benefit.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002

MightyThor4-Nov-02 9:27

4-Nov-02 9:27

Hi,

I'm trying to develop a table control like Chris Mauder's GridControl. And like in GridControl or MFC's list control i created a struct to contain the elements to set for cell properties.

Now i wonder, instead of using a struct and specifying the mask variable so that it will understand which properties we want to change, can't we use a class and set all variables to NULL in the constructor? That way we wouldn't need to '&' the mask with predefined mask values and see if it's set or not, we could just check every variable if it's NULL or not.

Well, this makes sense to me but i need advice from experienced programmers.

Thanks in advance.

Christian Graus4-Nov-02 9:55

4-Nov-02 9:55

A struct is the same as a class, except it's members are public by default. There is no reason you cannot specify a constructor for a struct.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002

MightyThor4-Nov-02 9:59

4-Nov-02 9:59

ok, so is it ok to specify a constructor in a struct or class and assign NULL to all variables and not to use masks as i mentioned in my previous post?

Thanks.

Christian Graus4-Nov-02 10:34

4-Nov-02 10:34

I think Daniel has answered your core question more directly, but I just wanted to note that a struct is a class, with only the one difference.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002

MightyThor4-Nov-02 10:49

4-Nov-02 10:49

i understand and apreciate it. Thank you.

Daniel Turini4-Nov-02 9:55

Daniel Turini

4-Nov-02 9:55

Bit flags are widely used for performance reasons, not for style reasons. In a pure OOP, you're right. And maybe, using inline functions we could accomplish the same thing.
But, as I've said, programmers are so accostumed to do things this way, that they won't change so soon.
The other reason to do this is that it's much easier to change this flags using a single window message (WM_*) than to do it dispatching a ton of messages.
In some API calls this is also used to reduce the number of parameters. Ok, this could also be done with unions and bitfields but, it's so easy to do a ACCESS_READ | ACCESS_WRITE when calling a function, that's still done this way.

lazy isn't my middle name.. its my first.. people just keep calling me Mel cause that's what they put on my drivers license. - Mel Feik

MightyThor4-Nov-02 10:26

scroll using middle button

4-Nov-02 10:26

Thank you. So, since there are many issues i have to cover, i'd better stick to conventional ways instead of playing around to find something more comfortable. It probably will wind up causing problems or need to write to more code.

Thanks again.

orcun colak4-Nov-02 8:54

orcun colak

4-Nov-02 8:54

Internet Explorer allows me to scroll using middle button of my mouse. How can I do the same for a list control ?

Orcun Colak

Re: scroll using middle button

lucy4-Nov-02 9:39

lucy

4-Nov-02 9:39

handle the WM_MOUSEWHEEL message?

how to make one function dual duty?

ns4-Nov-02 8:04

4-Nov-02 8:04

I have a functionality in a trackpopupmenu (right context menu). I want to put this into my main menu as well. When the context menu item runs, it triggers a function: OnCustomContextEdit(). How can I make the same function run if I click on my new menu item? Or do I have to make a new OnStandardMenuEdit(), and cut and paste the code?
Thanks,

Appreciate your help,
ns

Anonymous4-Nov-02 8:06

4-Nov-02 8:06

Set the menu item resource ID to the same value.

ns4-Nov-02 8:14

4-Nov-02 8:14

Thanks!

Appreciate your help,
ns

ns4-Nov-02 8:26

4-Nov-02 8:26

Worked great! It took care of the OnUpdate function as well.....is that expected? So basically it ran both OnEdit and OnUpdateEdit().....

Appreciate your help,
ns

Anonymous4-Nov-02 8:31

4-Nov-02 8:31

If your speaking of the ON_UPDATE_COMMAND_UI() message. Yes, thats expected. That is expected of any message you handle. If two controls have the same ID, it will handle them with the same function.

Re: C++ serial communication

ns4-Nov-02 8:38

4-Nov-02 8:38

Thats the function I was talking about. Thanks. The changes took no time and were painless with your idea!

Appreciate your help,
ns

C++ serial communication

Ayush4-Nov-02 7:59

Ayush

4-Nov-02 7:59

I've been referring to the article here on win32 serial comms. Im building a link to perform just one character(1 byte) transmission/reception via the serial port. I managed to get the send(WriteFile) working, but the receiver just doesnt seem to work, nor does it give an error. This is the code im using for the receive character function.

void CBuggyControllerDlg::OnRec() <br />
{<br />
<br />
	UpdateData(TRUE);<br />
	if((ReadFile(handlePort_,&recd,1,&length,NULL))==0)<br />
	{AfxMessageBox("No Data on Input Serial Buffer");}<br />
	else{<br />
		m_strlistupdate=recd;<br />
		m_list.InsertString (0, _T(m_strlistupdate));}<br />
	<br />
}

The function is called only after a byte has been sent and hence no monitoring of the port is necessary, although i imagine a loop would be needed. When i send a byte to this programs serial port, and then click recieve{OnRec()}, it doesnt give an error, nor does it display the right character. Could somebody please help me? I have set all the dcb config, including the one for flow control. Send Data works perfectly.

Ayush4-Nov-02 8:22

Ayush

4-Nov-02 8:22

On second thought, it might be working except for the fact that i might be messing up my strings. The buffer for readfile/writefile needs to be a void* hence i declared recd as BYTE recd;. Now how does one make the character thats been stored in recd, into a string, or make m_strlistupdate take the value of recd ?

The serial readfile could probably be wrong, but i just noticed this. Please let me know if you find errors in the code.

Thanks!

Context Menu from the Status Bar..

Anonymous4-Nov-02 7:40