GDI SetDIBitsToDevice help - C / C++ / MFC Discussion Boards

Re: Dialog debug error: DAMAGE

xylo0419-Nov-04 10:11

xylo04

19-Nov-04 10:11

ps I'm a member, i really am! login was funky...

Help me! I have no idea what's happening! Please?

Re: Dialog debug error: DAMAGE

zoid ! 19-Nov-04 10:40

zoid !

19-Nov-04 10:40

As far as I remember this message occurs if you overwrite the bounds of memory that you allocate.

I.E.

char *temp = new char [100];

for(l=0;l<200;l++)
char[l]='x';

will cause this message.

hope that helps.

Re: Dialog debug error: DAMAGE

zoid ! 19-Nov-04 10:42

zoid !

19-Nov-04 10:42

I forgot to add...

delete [] temp;
/\
|
|----- this is when the error will be reported.

Re: Dialog debug error: DAMAGE

xylo0419-Nov-04 12:03

xylo04

19-Nov-04 12:03

Very strange problem... Didn't find the cause, but I did find some ints in my data structures that were never initialized. After I initialize them, the dialog seems to work, so I'll go with it... Makes absolutely no sense...

Help me! I have no idea what's happening! Please?

Help!!! How to write single Event Handler for 100 buttons

VikramDelhi19-Nov-04 9:56

VikramDelhi

19-Nov-04 9:56

Hi,
I am working on a small periodic table for my college friends. The idea of the application is that there will be a button for each element, placed in the same style as that of Modern periodic table. Now I have 2 options to implement this.
-> I must place more than 100 buttons on the Dialog and write event handler for each button.
-> or place buttons and write single event handler for all button.

What should I choose? Or suggest anything else I can implement.

Also, if I implement 2nd option, how I can detect which button is clicked

Re: Help!!! How to write single Event Handler for 100 buttons

David Crow19-Nov-04 10:06

David Crow

19-Nov-04 10:06

Check out ON_NOTIFY_RANGE().

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Help!!! How to write single Event Handler for 100 buttons

Member 30761219-Nov-04 19:07

Member 307612

19-Nov-04 19:07

...Or check ON_COMMAND_RANGE, just make sure your buttons have subsequent IDs. Your handler will look like:
void MyApp::OnButton(UINT nID)
{
int nIdx = nID-IDC_BUTTON1;
// handle button by order index
}

Igor Green
http://www.grigsoft.com
Compare It! + Synchronize It! : Files and folders comparison never was easier!

GDI SetDIBitsToDevice help

Budric B.19-Nov-04 7:51

Budric B.

19-Nov-04 7:51

Hi,
I'm having trouble displaying a picture by overriding OnPaint() method and putting the function SetDIBitsToDevice in there. Here's a bit of the code

<br />
void CProjectorFrame::ShowPattern()<br />
{<br />
	m_bBlank = false;<br />
	OnPaint();<br />
}<br />
void CProjectorFrame::OnPaint() <br />
{<br />
	CPaintDC dc(this); // device context for painting	<br />
	CRect rClient;<br />
	GetClientRect(&rClient);<br />
<br />
	if (m_bBlank)  //output black screen<br />
	{<br />
		dc.SetBkColor(RGB(0, 0, 0));<br />
		dc.ExtTextOut(0,0,ETO_OPAQUE, &rClient,0,0,0);<br />
		return;<br />
	}<br />
        else<br />
	{<br />
		int val = ::SetDIBitsToDevice(<br />
		dc,<br />
		m_nXOffset, <br />
		m_nYOffset,<br />
		m_BitmapInfo.bmiHeader.biWidth, <br />
		m_nImageHeight,<br />
		0, <br />
		0,<br />
		0, <br />
		m_nImageHeight,<br />
		m_pImage, <br />
		&m_BitmapInfo, <br />
		DIB_RGB_COLORS );<br />
	}<br />
}<br />
//...now in another function in a different class I call<br />
m_MyObject.ShowPattern();<br />

But the pattern doesn't display right after the call to ShowPattern(). I ran this through the debugger and everything seems to work fine. SetDIBitsToDevice actually returns that it set 768 lines, and all the code executes. I'm confused.

Thanks.

Re: GDI SetDIBitsToDevice help

PJ Arends20-Nov-04 9:46

PJ Arends

20-Nov-04 9:46

Budric B. wrote:
void CProjectorFrame::ShowPattern()
{
m_bBlank = false;
OnPaint();
}

Never call OnPaint() directly. OnPaint() will be called automatically by the framework when the UpdateWindow() or RedrawWindow() member functions are called. If you call it directly, many of the internal data structures might not be initialized correctly and can lead to all sorts of errors.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

NetBios Shared Folders Scanner

Y3YPnATOP19-Nov-04 7:16

Y3YPnATOP

19-Nov-04 7:16

Any knows, how to write this tool for windows.
What DLLs should I use?
What Methods etc
I want to do this thing in some range of IP

Re: NetBios Shared Folders Scanner

David Crow19-Nov-04 10:09

David Crow

19-Nov-04 10:09

What about WNetOpenEnum() and WNetEnumResource()? Or NetShareEnum()?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Command driven application

Deelip19-Nov-04 7:14

Deelip

19-Nov-04 7:14

I wonder if anyone can point me to any literature regarding designing a command driven application like AutoCAD. I already have the GUI (drawing view, command bar, etc.) in place. I now need the command engine to run the GUI.

For example, if the user enters "LINE" at the command prompt, a new thread (I guess) should begin which looks for mouse clicks in the drawing view and keyboard events at the command prompt (for the line's end point coordinates). This thread should not return untill all the required input is gathered, in this case, the two end points of the line to be created. The user can specify the start point of the line by clicking in the drawing view and enter the coordinates of the end point at the command prompt. After this is done the thread returns control to the calling function which creates the line.

Any comments, suggestions, ideas that will help me achieve this will be greatly appreciated.

Thanks.

Re: Command driven application

BlackDice19-Nov-04 7:22

BlackDice

19-Nov-04 7:22

I would try looking at apps that use parsing, like the one written by toxcct (whose post you can see below).

If I write code in my sleep, does that make me brilliant, or just a lazy programmer?

My articles

www.stillwaterexpress.com

BlackDice - the programmer formerly known as bdiamond

Re: Command driven application

Deelip19-Nov-04 17:16

Deelip

19-Nov-04 17:16

Could find the article. Can you send me a link?

/Deelip

Re: Command driven application

Maximilien19-Nov-04 7:36

Maximilien

19-Nov-04 7:36

no need for threading ...

a simple workflow ( or state machine ) to direct the user at what to do.

when a user start a new command, the system wait for an input; if the input is good, then, the system advance to the next event, ... so on and so forth.

for example, for a line command ... ( very pseudo-code )

-Start Line Command <br />
-While ( first point not picked )<br />
  wait for user to click or type a valid point.<br />
-if first point is valid<br />
  -While ( second point not picked )<br />
    wait for user to click or type a valid point.<br />
-if second point valid<br />
   Create line with both points.<br />
-End Line Command

Maximilien Lincourt
Your Head A Splode - Strong Bad

changing defaut button

toxcct19-Nov-04 6:09

toxcct

19-Nov-04 6:09

hi everybody,

how can i, in a dialog dox application, change the default button ?
i've tried to change the styles (SetStyle() or something like that) of the buttons, but it only changes the STYLE, and not the effective function of DEFAULT BUTTON.

any ideas guys ?

thx a lot

TOXCCT >>> GEII power

Re: changing defaut button

basementman19-Nov-04 6:30

basementman

19-Nov-04 6:30

From MSDN:
An application sends a DM_SETDEFID message to change the identifier of the default push button for a dialog box.

DM_SETDEFID
wParam = idControl; // identifier of new default push button

onwards and upwards...

Re: changing defaut button

BlackDice19-Nov-04 6:33

BlackDice

19-Nov-04 6:33

It's already a method of the CDialog class: CDialog::SetDefID()

this->SetDefID(IDC_BUTTON1); works just fine. Smile | :)

If I write code in my sleep, does that make me brilliant, or just a lazy programmer?

My articles

www.stillwaterexpress.com

BlackDice - the programmer formerly known as bdiamond

Re: changing defaut button

Yulianto.19-Nov-04 14:03

Yulianto.

19-Nov-04 14:03

Default button? Check the button properties.

<italic>Work hard and a bit of luck is the key to success.

You don`t need to be genius, to be rich.

Re: changing defaut button

toxcct20-Nov-04 7:52

toxcct

20-Nov-04 7:52

no, if you did have a look at what i said previously, i've already done this, and, it doesn't change nothing else but the style of the buttons, not the effective default action...

TOXCCT >>> GEII power

Re: changing defaut button

Yulianto.21-Nov-04 21:21

Yulianto.

21-Nov-04 21:21

Oh you did. Try not to use any style on that button. This might be a bug.

<italic>Work hard and a bit of luck is the key to success.

You don`t need to be genius, to be rich.

Re: changing defaut button

Yulianto.22-Nov-04 15:56

Yulianto.

22-Nov-04 15:56

Maybe you delete the IDOK button, and it is the default button. Start over again, and change the IDOK button as your default button. Got the idea?

<italic>Work hard and a bit of luck is the key to success.

You don`t need to be genius, to be rich.

Re: changing defaut button

toxcct22-Nov-04 20:34

toxcct

22-Nov-04 20:34

sorry but...
you're fully wrong !
i need to change the default button programmatically because the default button will change in time depending on several events...

you've got it now ?

TOXCCT >>> GEII power

Re: changing defaut button

bmzhao19-Nov-04 15:01

bmzhao

19-Nov-04 15:01

Use resource eidt ,set the button default.

Re: changing defaut button

toxcct20-Nov-04 7:53

toxcct

20-Nov-04 7:53

ok, and when i want to change the default property when the program is running, what do i do ? Confused | :confused:

TOXCCT >>> GEII power

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.