C / C++ / MFC Discussion Boards

Christian Graus14-Jun-05 2:01

14-Jun-05 2:01

No 16 bit ?

If you're using GDI+, read my articles on the subject. Otherwise, I guess either save to bitmap only ( the format is well documented and simple ), or find some other library to use.

Christian Graus - Microsoft MVP - C++

converting byte to bit

Arrun14-Jun-05 1:24

Arrun

14-Jun-05 1:24

Hi I am doing a project in image processing using MFC. GetBitmapBits() stores the pixel value in a BYTE array. It works fine with 8 bits bitmap, but when working with 4 bits bitmap, it combines 2 pixel values and stores in the BYTE array.

How to overcome this problem

Re: converting byte to bit

Christian Graus14-Jun-05 1:29

Christian Graus

14-Jun-05 1:29

Use && and || to combine and mask values, instead of + or =. For example, FF && F0 == F0. If you take an 8 bit number and set it to equal itself && 15, you get only the low four bits, && 240 gives you the high four. In that way, you can set one pixel to zero. Then if you want to set the pixel in the low four bits, you just put oldVal || newval, that copies it in. to copy into the high four, do this: oldval || ( newVal << 4). this shifts the values up four bits first. To just set two pixels do this (pixelLeft << 4) + pixelRight. You can use plus here, because you're replacing both values.

Christian Graus - Microsoft MVP - C++

Re: converting byte to bit

PJ Arends14-Jun-05 7:08

PJ Arends

14-Jun-05 7:08

Close, but not quite. The operators he wants are | and & (bitwise operators as opposed to logical operators). See http://www.codeproject.com/cpp/bitbashing.asp[^]

Re: converting byte to bit

Christian Graus14-Jun-05 13:49

Christian Graus

14-Jun-05 13:49

Dagnamit. Sorry. Blush | :O

Christian Graus - Microsoft MVP - C++

how to debug a helper object?

ThinkingPrometheus14-Jun-05 0:54

ThinkingPrometheus

14-Jun-05 0:54

hiho@ll

i try to change the source of a browser helper object, which makes some strange things (like opening google, if i want to open a .js file Wink | ;-)

)

my question (because i don't really know much about helper objects) how can i debug the object?
it is visible as an Add on in Inernet Explorer
and when i try to debug the bho visual studio .net asks which application holds the debug information
i tried using Internet Explorer, but didn't work

the helper object is a dll
maybe the question should be how to debug a dll?

thx@ll

Release in _RecordsetPtr

Anonymous14-Jun-05 0:36

Anonymous

14-Jun-05 0:36

Is Release method in _RecordsetPtr must be called in the following code. Only Close is not Enough ?

fun()
{
_RecordsetPtr rs;

//...
//...
rs.Close();

}

Shell Extension On 64 bit Windows XP

Bond0414-Jun-05 0:10

Bond04

14-Jun-05 0:10

I am building the shell extension for 64 bit windows XP. While compiling the 32 bit shell extension code (working well on windows xp 32 bit) on visual studio.NET 2003 on 64 bit build environment getting the following errors:

myapp.obj : error LNK2001: unresolved external symbol _CLSID_BkgndCtxMenuExt
myapp.obj : error LNK2019: unresolved external symbol _LIBID_DIRBKGNDEXTLib referenced in function _DllMain@12
myapp.obj : error LNK2001: unresolved external symbol _IID_IBkgndCtxMenuExt

anybody please help me on this..
or is there any way to make 32 bit shell extension dll to work on 64 bit windows xp. on windows site its written that 32 shell extension will not work on 64 bit windows..

So what are the interfaces for shell extention in 64 bit windows XP.

thanks

need help!! please help me..

c_ngo13-Jun-05 20:39

c_ngo

13-Jun-05 20:39

hi guys! my name's candy..im having a little trouble with a school project of mine..i need to look for a "C programming using pointer" and i dont have any idea what it is..can somebody help me please..id really really really appreciate it if any of you guys can help me..thanks

Big Grin | :-D

Re: need help!! please help me..

Bob Stanneveld13-Jun-05 23:51

Bob Stanneveld

13-Jun-05 23:51

Hello,

Using a search engine also does some magic... Anyway, this[^] should help.

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

Blog[^]

Re: need help!! please help me..

Nilesh K.14-Jun-05 0:25

Nilesh K.

14-Jun-05 0:25

Check here[^]

<bold>- Nilesh
<italics>"Reading made Don Quixote a gentleman. Believing what he read made him mad" -George Bernard Shaw

Re: need help!! please help me..

Christian Graus14-Jun-05 1:21

Christian Graus

14-Jun-05 1:21

Is your name really Candy, or did you just think that was a name that would get guys to help ? :P

Seriously, the web is full of help, there is at least one article on this site, and your textbooks should be loaded with info also. However, by all means if you read your textbook and you're stuck on *specific* things, feel free to ask, whatever your name is....

Christian Graus - Microsoft MVP - C++

Re: need help!! please help me..

Bob Stanneveld14-Jun-05 3:32

Bob Stanneveld

14-Jun-05 3:32

Christian Graus wrote:
Is your name really Candy, or did you just think that was a name that would get guys to help ?

And no, I didn't answer because the name was Candy... Roll eyes | :rolleyes:

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

Blog[^]

Re: need help!! please help me..

c_ngo15-Jun-05 15:30

c_ngo

15-Jun-05 15:30

yes my name is really Candy Smile | :)

thanks for the help..i really appreciated it

Re: need help!! please help me..

c_ngo15-Jun-05 15:35

c_ngo

15-Jun-05 15:35

thank you so much guys! i really appreciated all the help!! by the way..no i did not use the name Candy so that i could get guys to help me because my name is really Candy..tnx! Smile | :)

How to remove close button from window?

amrutajoshi13-Jun-05 20:36

amrutajoshi

13-Jun-05 20:36

How to remove close button from window?I just want maximize and minimize buttons on window.if it is not possible to remove close button can i make it disable?
I have tried it using WS_MAXIMIZEBOX and WS_MINIMIZEBOX .But it is not working.

Re: How to remove close button from window?

Bob Stanneveld13-Jun-05 23:58

Bob Stanneveld

13-Jun-05 23:58

Hello,

I don't think that there is an easy way to remove the close button, since it's part of the system menu. You can use GetSystemMenu() to disable it..

You can also remove the entire title bar.

But please tell me why you want to remove the close button? Users will be really annoyed by this!

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

Blog[^]

Re: How to remove close button from window?

Stlan14-Jun-05 0:01

Stlan

14-Jun-05 0:01

Try this: GetSystemMenu(FALSE)->EnableMenuItem(SC_CLOSE, FALSE);

FileSystemWatcher - File used by another process

g3e13-Jun-05 23:36

g3e

13-Jun-05 23:36

Hi,
I've written a windows service to parse files.It uses the FileSystemWatcher class in C# to sniff a folder for particular type of files. But when the files were being processed, i repeatedly get the error "The process cannot access the file "AAA" because it is being used by another process". To overcome this problem, i added the following. lines of code

<br />
<br />
public bool ParseEnvFile(string strFilePath)<br />
{<br />
			try<br />
			{<br />
				using(FileStream fs = new FileStream(strFilePath, FileMode.Open, FileAccess.Read, FileShare.Read))<br />
				{<br />
					// Do some processing here<br />
					fs.Close();<br />
					m_nReadAttempts = 0;<br />
				}<br />
			}<br />
			catch(IOException ex)<br />
			{<br />
				if(m_nReadAttempts < 3)<br />
				{<br />
					Thread.Sleep(2000);<br />
					m_nReadAttempts++;<br />
					return ParseEnvFile(strFilePath);<br />
				}<br />
				else<br />
				{<br />
					throw ex;<br />
				}<br />
			}<br />
.....<br />
}<br />

But even this did not solve the problem. The exception still kept coming, though less frequently.
So I was forced to add a Timer event(runs every 5 mins) that would pick up all the files that were left over because of the exception.
Now, my problem is this:
When a file gets created in the folder, sometimes both the OnFileCreated event and the timer event try to access the file at the same time. Within my
service, I'm required to open the file in write mode and update some contents. I find that at times the file that gets created ends up as a 0KB file (Note: when it initially got created the file had some content in it)!!!!

Any ideas on why this happens?
Thanks for any help in resolving this problem.

how to change debug options?

ThinkingPrometheus13-Jun-05 23:35

ThinkingPrometheus

13-Jun-05 23:35

hiho@ll

i'm using Visual Studio .Net

1. i have compiled/runned/debugged many "self-made" projects and some projects from codeproject.com

2. i got the source of a programm which i want to debug, which seems to be programmed using visual studio 6.0

3. if i try to debug the prog i get the following error:
"
Unable to start debugging.
Unable to start program "c:\program files\internet explorer\iexplore.exe"
Das System kann die angegebene Datei nicht finden.
"

4. it seems that .net tries to debug using iexplore.exe in program files folder
but my iexplore.exe is in programme\Internet Explorer\...

question: how can i change the debug options for this project that .Net knows that iexplore.exe is not in program files\ but in programme\ folder?

thx@ll

Exe to Dll

Hemoji13-Jun-05 23:30

Hemoji

13-Jun-05 23:30

Hi,

I have a project built on winsock2, it listens to a particular port and responds to client requests. Its a customized Server for our needs.

I got to port it to DLL and invoke this in VB. How do I do this?

Any suggestions?

thanks in advance.

Hemo

Re: Exe to Dll

Rick York14-Jun-05 10:12

Rick York

14-Jun-05 10:12

Have a look at this : http://support.microsoft.com/kb/106553/EN-US/[^]

e trefreshes the BitMap image

a_david12313-Jun-05 23:17

a_david123

13-Jun-05 23:17

Respecte All

Regards!
I am a new one to VC++ and learning phase.
I haev a problem

" i loaded a bitmap on a bialogbox but when i minimiz the Runtime window and then when i maximize the Runtime window then the Bitmap is not here on the runtime window.
I dont understand what's the problem.
Kindly guide me.

Bset Wishes

David

david

Re: e trefreshes the BitMap image

Christian Graus14-Jun-05 1:24

Christian Graus

14-Jun-05 1:24

Where did you paint the bitmap onto the dialog ? You need to do it in either OnEraseBackground, or OnPaint.

Christian Graus - Microsoft MVP - C++

Re: e trefreshes the BitMap image

a_david12315-Jun-05 20:27

a_david123

15-Jun-05 20:27

Thanks Sir

I am loading Bit Map directly on Dialog and that's why I think problem are coming
"but how i do it on OnPaint?"

Best wishes
David

david

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