Re: Convert 24bit bmp to dithered 2bit bmp - C / C++ / MFC Discussion Boards

Tom Wright12-Jul-05 6:49

12-Jul-05 6:49

I've got a function that will put any text into a list box. It's set so that it will set the horizontal scroll depending on the length of the string.

<br />
void CDataXFerDlg::OnWriteToListBox(CString pLstString, CString strError)<br />
{<br />
	if (m_cSentLst.m_hWnd)<br />
	{<br />
		if (m_cSentLst.GetCount() > 100)<br />
		{<br />
			m_cSentLst.DeleteString(100);<br />
		}<br />
		m_cSentLst.InsertString(0, pLstString + strError);<br />
		m_cSentLst.SetHorizontalExtent(pLstString.GetLength() + strError.GetLength());<br />
	}<br />
<br />
}<br />

However it will not work. I can only get it to work if I put in some int like 300. Then the scroll works fine. Am I supposed to do something else?

Thanks

Tom Wright
tawright915@yahoo.com

Re: List box question

RChin12-Jul-05 7:02

RChin

12-Jul-05 7:02

This is because the SetHorizontalExtent 's input parameter is in pixels, not number of characters.

I Dream of Absolute Zero

Re: List box question

Tom Wright12-Jul-05 7:14

Tom Wright

12-Jul-05 7:14

but it's still asking for an int. which is what I'm passing. what should I multiply it by to equal chars......how many pixels are in a char...on average?

Tom Wright
tawright915@yahoo.com

Re: List box question

Jack Puppy12-Jul-05 7:42

Jack Puppy

12-Jul-05 7:42

You need to use the GetTextExtent function to calculate the width of the string...

<br />
CClientDC dc(this);<br />
<br />
// Select list box font into the dc<br />
CFont* pOldFont = dc.SelectObject(GetFont());<br />
<br />
// Get the text metrics for the font<br />
TEXTMETRIC tm;<br />
dc.GetTextMetrics(&tm);<br />
<br />
...<br />
<br />
// Calculate the horizontal extent of the item (add the width of average character in font for spacing)<br />
nHorizontalExtent = dc.GetTextExtent(strText).cx + tm.tmAveCharWidth;<br />
<br />
... <br />
<br />
// Restore the GDI<br />
dc.SelectObject(pOldFont);<br />

Pssst. You see that little light on your monitor? That's actually a government installed spy camera. Smile and wave to big brother!

Painted on the side of a dog trainer's van: SIT HAPPENS

Get The Status Of A Thread

yccheok12-Jul-05 6:38

yccheok

12-Jul-05 6:38

hi, may i noe is there any API enable me to know the status of a thread through its handle?

HANDLE h = CreateThread(...

GetThreadStatus(h) == ALIVE || GetThreadStatus(h) == SLEEPING || GetThreadStatus(h) == DEAD

Currently, i create a thread A (with handle hA) in MAIN thread, and let the thread A run in funA. My thread A will set the hA to null at the end of funA.

This is the way for my MAIN thread to see whether thread A is alive

if(hA != NULL) ALIVE;

this method is quite cumbersome, can anyone share out better technique?

thank you very much!

cheok

Re: Get The Status Of A Thread

David Crow12-Jul-05 8:19

David Crow

12-Jul-05 8:19

Why would you need to know the status of the thread? The main thread should not be concerned with what any secondary threads are doing. If the secondary thread needs to communicate with the main thread, it should post a message. Once a secondary thread exists, you can use GetExitCodeThread() to get its termination status.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Convert 24bit bmp to dithered 2bit bmp

Pabs(Sco)12-Jul-05 5:06

Pabs(Sco)

12-Jul-05 5:06

Hi!!

I must admit your site has been very usfull to me :p

any way I have been looking throught the MFC GDI+ articles you have, and throught them I have manged to convert a 24bit Colour bmp to a greyscale 24bit bmp.

I was wondering if there is a way to convert the bmp to a 2bit dithered bmp?

I have looked about but not found anything that I can undestand(and mainly all .NET code Blush | :O

)

I have seen the Bitmap::ConvertFormat and the Image.SetPalette but these require a ColorPalette structure and I cant seem to find a useful article on how to create one.

any help is appriciated :->

Junior Programmer (Newbie)

From Scotland

Re: Convert 24bit bmp to dithered 2bit bmp

Andrew Kirillov12-Jul-05 5:37

Andrew Kirillov

12-Jul-05 5:37

Hello

You can look at my image processing library [^]. There are several dithering methods implemented. The library is on C#, but it's not hard to understand these algorithms.

You can also look at CxImage[^], which is written on C++.

Andrew

Re: Convert 24bit bmp to dithered 2bit bmp

Pabs(Sco)12-Jul-05 5:54

Pabs(Sco)

12-Jul-05 5:54

Thanks I'll look into those!!

Junior Programmer (Newbie)

From Scotland

HELP ME!!!!!!

Member 202519312-Jul-05 4:29

Member 2025193

12-Jul-05 4:29

write a c++ prog thathandles 3 types of objects.
-trucks
-cars with engine cappacity greater than 1200cc
-cars with engine cappacity less than 1200cc
the annual road tax for a truck is $3000,those with engine cappacity gretaer than 1200cc is $300 and that with less than 1200cc is $180
a text file holds the infomation on all vehicles within the company as shown
T w123mgb 5200 12(T stands for a truck object)
L k670kvc 2200 7(L stands for car with engine cappacitiy >1200cc
S y317jnb 1100 (S stands for a car with engine capacity <=1200cc)
the requirements of the program is to
a)read all records from the file and create an object for each type of vehicle
b)to provide a display method which given a registration number prints the details of that particular vehicle
c)as an additional measure, it should be able to calculate hte total ammount of road tax paid in a year.

develop a program to impleent this specification. the prog should use inheritance or polymorphism if appropriate. the number of records in the file should not exceed 100

Re: HELP ME!!!!!!

Jose Lamas Rios12-Jul-05 4:47

Jose Lamas Rios

12-Jul-05 4:47

START BY HELPING YOURSELF!!!!!!!

Ok. Now go and do your own homework. If you have specific questions, post them here.

By the way, a subject line describing your problem is preferred, rather than just shouting for help.

--
jlr
http://jlamas.blogspot.com/[^]

Re: HELP ME!!!!!!

toxcct12-Jul-05 6:12

toxcct

12-Jul-05 6:12

good joke

continue like this, i love your humour...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: HELP ME!!!!!!

Tom Wright12-Jul-05 6:51

Tom Wright

12-Jul-05 6:51

go to rentacoder.com If you want someone to do your homework at least pay them.

Tom Wright
tawright915@yahoo.com

Re: HELP ME!!!!!!

Bob Stanneveld12-Jul-05 21:09

Bob Stanneveld

12-Jul-05 21:09

I'll help you if you'll help me to retire by the time I finish your program..

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

Capturing mouse events and Cursor

Kharfax12-Jul-05 3:53

Kharfax

12-Jul-05 3:53

Hi
Im using SetCapture() to capture mouse events, so when the user clicks the program writtes something in that place.
Thats working great, but i would like to change the mouse cursor until user clicks.
I tried using SetCursor() but just works in my client area.
And WM_SETCURSOR is only sent to my window if the user has a button pressed.

Any sugestions?

Thanks in advance

Re: Capturing mouse events and Cursor

Blake Miller12-Jul-05 4:56

Blake Miller

12-Jul-05 4:56

Put a transparent window over the entire desktop and have it set the cursor. Once user clicks, translate it into the coordinate or whatever you want, and then hide the transparent window. I am pretty sure winow overrides the cursor shape for each window the mouse goes over, so you need to cover the entire portion of your 'working area' with a window that can 'force' the cursor to your desired shape.

OTHERWISE, take a look at some of the samples that use the 'window finder' tool, since they seem to be able to change the mouse cursor regardless of the window it is over. I am also pretty sure they rely upon the left mouse button being down for some reason - maybe merely to know when user has made a selection when the button is released, but since I never had occasion to use one of these, you will have to reasearch that part yourself.

Re: Capturing mouse events and Cursor

Kharfax12-Jul-05 5:03

Kharfax

12-Jul-05 5:03

Good idea, i gona try it

Thanks for the suggestion Wink | ;)

Re: Capturing mouse events and Cursor

Trollslayer12-Jul-05 8:34

Trollslayer

12-Jul-05 8:34

Create a handler for WM_MOUSEMOVE, this gives you both local position and button states.

Elaine Rose | [Rose]

The tigress is here Big Grin | :-D

Re: Capturing mouse events and Cursor

Kharfax12-Jul-05 10:44

Kharfax

12-Jul-05 10:44

Thanks for the suggestion Elaine Smile | :)

But WM_MOUSEMOVE is sent to your application just if a button is pressed once the cursor leaves your client area.

That's why you have to drag the target cursor in programs like spy++

Re: Capturing mouse events and Cursor

Trollslayer12-Jul-05 11:33

Trollslayer

12-Jul-05 11:33

You will get events every time a new mouse position is regsitered by your application then reads the mouse button states and can detect a click that way.
You could also use OnClick and follow the last position given by your OnMouseMove handler.

The tigress is here Big Grin | :-D

Re: I found a solution

Kharfax13-Jul-05 4:57

Kharfax

13-Jul-05 4:57

At last i found a solution...

I just simulate a drag operation, to do that, when the user clicks my button i simulate that the user press the right button using

mouse_event(MOUSEEVENTF_RIGHTDOWN,0,0,0, GetMessageExtraInfo());

Then when the cursor is outside my client area im still able to set the cursor shape.

Once the user clicks in the other window, i simulate that the user releases the right button using

mouse_event(MOUSEEVENTF_RIGHTUP,0,0,0, GetMessageExtraInfo());

And after that, i simulate the click the user has just done

mouse_event(MOUSEEVENTF_LEFTDOWN,0,0,0, GetMessageExtraInfo());
mouse_event(MOUSEEVENTF_LEFTUP,0,0,0, GetMessageExtraInfo());

This work great for me, maybe if you have a Context menu, this isn't going to work, you could try using the middle button...

Ok, i wrotte this because i saw a lot of post similar to mine, and very few answers to this problem.

Thx to all for your suggestions

How to Create inbound application using Tapi 3.0

riyajain12-Jul-05 3:02

riyajain

12-Jul-05 3:02

Hello,

i am developing inbound application using Tapi 2.0. now i want to
convert that application in Tapi 3.0. i don't know much about com.
any one know how to create inbound application using Tapi 3.0.

Any source code available. Plase send me source code for handling
incoming call.

please help me.

Best regards

Riya jain

dafdd

How do I read a particular registry key

Matthew Devine12-Jul-05 2:37

Matthew Devine

12-Jul-05 2:37

Hi Everyone,

I want to be able to read the Registry "ProxyEnable" located within HKEY_CURRENT_USER and located at the following path Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings. What I want to be able to do is tell whether "ProxyEnable" is on or off. Not quite sure how to do that particular piece though.

Thanks in advance,
Matt

Re: How do I read a particular registry key

Jose Lamas Rios12-Jul-05 2:59

Jose Lamas Rios

12-Jul-05 2:59

Add KEY_QUERY_VALUE to the access rights specified when opening the key, and then use RegQueryValueEx[^].

--
jlr
http://jlamas.blogspot.com/[^]

Re: How do I read a particular registry key

Matthew Devine12-Jul-05 3:47

Matthew Devine

12-Jul-05 3:47

The issue I seem to be having is that ProxyEnable is actually a Reg_DWORD key, so I don't think I'm reading it in correctly and I'm not sure how to verify that its actually an enabled key. Basically if I were to get a value back from doing a query on that key, what do I compare its value to?

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