C / C++ / MFC Discussion Boards

Re: 2 quick questions...

Arsalan Malik16-Sep-04 2:48

Arsalan Malik

16-Sep-04 2:48

How does one do about retrieving the taskbar window handle (HWND or CWnd)?

HWND hTaskBar = FindWindow("Shell_TrayWnd", NULL);

I am not sure about first question, I think you can probably do it!

ARSALAN MALIK

Re: 2 quick questions...

David Crow16-Sep-04 3:47

David Crow

16-Sep-04 3:47

dNimrod#X wrote:
Can one implement DLLs in VC with MFC support?

Yes. Remember that DLLs existed long before MFC came about.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: 2 quick questions...

0v3rloader16-Sep-04 4:26

0v3rloader

16-Sep-04 4:26

That's great!

By the way, will I have to take special care about any particular issue(s) related to developing a DLL with MFC support?

David

Re: 2 quick questions...

David Crow16-Sep-04 4:39

David Crow

16-Sep-04 4:39

With AppWizard, you can create two types of DLL projects: MFC and Win32. With MFC, you can create a:

regular DLL with MFC statically linked

regular DLL with shared MFC DLL

MFC extension DLL.

Search MSDN for examples of each.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: 2 quick questions...

0v3rloader16-Sep-04 5:19

0v3rloader

16-Sep-04 5:19

Yeah, I've done that so far. My question had to do more with issues such as:
- function declaration;
- does MFC act differently when running from a DLL?
- will I have to use CProcessLocal<CMyGlobalData> globalData (i.e.) to handle dynamic data? And if so, how/when should I use it?

I have done a couple of DLLs before, but none had MFC support, so I'm a bit lost out here. I really have no idea how MFC behaves when running from a DLL...

Thanks for your patience though! : )

Dave Nimrod

Re: 2 quick questions...

David Crow16-Sep-04 6:30

David Crow

16-Sep-04 6:30

dNimrod#X wrote:
function declaration;

Functions are declared the same no matter where they reside. One difference is that exported functions must use __declspec(dllexport) if they are going to be used by other EXEs and DLLs.

dNimrod#X wrote:
does MFC act differently when running from a DLL?

No, but there are precautions that must be taken. For instance, if a function within the DLL will be using a resource that is also contained within the DLL, a call to AFX_MANAGE_STATE() will be required so that the DLL's resource table is looked at rather than the EXE's.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: 2 quick questions...

0v3rloader16-Sep-04 8:01

0v3rloader

16-Sep-04 8:01

Thanks for the invaluable input!
You have been really helpful.

Dave

OleThreadMainWndName

shiraztk16-Sep-04 1:53

shiraztk

16-Sep-04 1:53

Hi all

I created a windows service that runs fine on windows 2000,xp and 98.

It runs fine on NT but I get a error dialog whenever I try to logoff,restart or shutdown my computer, keeping the service running. This dialog box appears twice, each time I have to press EndTask.
There is no problem if I shutdown my service and then logoff,restart or shutdown my computer.

Any Idea what could be wrong.?

This problem does not arise if I doesnt allow my serice to interact with the desktop. But that is not a solution.

Thanks in advance.
Shiraz

The Best Relligion is Science.
Once you understand it, you will know God.

Problem about char array

sacoskun16-Sep-04 1:49

sacoskun

16-Sep-04 1:49

Hey, here is my code.

// Constructor sets player's properties<br />
Player::Player( char pName[20] )<br />
{<br />
	playerName	= pName;<br />
	//isTurn		= false;<br />
	isWon		= false;<br />
	winsCount	= 0;<br />
}

I got the error from this part;

error C2440: '=' : cannot convert from 'char []' to 'char [20]'
There are no conversions to array types, although there are conversions to references or pointers to arrays

playerName is decleared as
char playerName[20]in header file.

Regards,

-
When in doubt, push a pawn!
-

Re: Problem about char array

Aamir Butt16-Sep-04 1:55

Aamir Butt

16-Sep-04 1:55

use strcpy() function to copy array. You can't do it like this.

strcpy(playerName, pName);

It will work

Imagine that you are creating a fabric of human destiny with the object of making men happy in the end, giving them peace and rest at last, but that it was essential and inevitable to torture to death only one tiny creature..and to found that edifice on its unavenged tears, would you consent to be the architect on those conditions? Tell me, and tell me the truth!

-Fyodor Dostoevsky, The Brothers Karamazov

Re: Problem about char array

Paolo Ponzano16-Sep-04 2:36

Paolo Ponzano

16-Sep-04 2:36

in this case BugSearcher is right, since arrays have the same size, in general case, you should use

<br />
strncpy(dest,src,number_bytes_to_be_copied);<br />

in order to avoid buffer-overflow

P.S. BugSearcher, I've found a bug in your code Laugh | :laugh:

Re: Problem about char array

sacoskun16-Sep-04 2:56

sacoskun

16-Sep-04 2:56

Thanks both of you.

However, I got warning this time

Warning C4996: 'strcpy' was declared deprecated
c:\Program Files\Microsoft Visual Studio 8\VC\include\string.h(62) : see declaration of 'strcpy'

Isn't there any method that returns nothing? or using in this way is better?

Regards,

-
When in doubt, push a pawn!
-

From CBitmap casting to HBitmap

Andreas BäckerII16-Sep-04 1:30

Andreas BäckerII

16-Sep-04 1:30

HI i have a problem that i can not cast a Cbitmap to HBITMAP to have a CWND handle. the code below should show my created Bitmap. Please

need a TIP......................!!!!!!!!!!!!

CBitmap pic1;
pic1.CreateBitmap( nWidth, nHeight, nPlanes, nBitCount, lpstr);

pic1.Attach(HBITMAP(pic1));//????????????????????????????????
BITMAP bild_header1;
pic1.GetBitmap(&bild_header1);
CWnd* wp1 = GetDlgItem( IDC_STATIC3);// IDC_STATIC_CAM1
CDC *pDC1 = wp1->GetDC();
CDC imageDC1;
imageDC1.CreateCompatibleDC(pDC1);
imageDC1.SelectObject(&pic1);
pDC1->BitBlt(0,0,bild_header1.bmWidth,bild_header1.bmHeight,&imageDC1,0,0,SRCCOPY);
imageDC1.DeleteDC();

Re: From CBitmap casting to HBitmap

Arsalan Malik16-Sep-04 1:46

Arsalan Malik

16-Sep-04 1:46

You don't need to Attach, once bitmap is created. So remove the line, it should work!

ARSALAN MALIK

Re: From CBitmap casting to HBitmap

Andreas BäckerII16-Sep-04 23:39

Andreas BäckerII

16-Sep-04 23:39

Thank you for y answer, have tryed it without attach before but its not running.
Even i need this attach because its necessary to display in the CWND.
So i need some how a HBITMAP and then need to attach it.
Actually the code running well when i am loading bitmap. But not in the way i have done now. I really stuck!"!!!!!!!!!!! Cry | :((

Re: From CBitmap casting to HBitmap

Andreas BäckerII17-Sep-04 4:35

Andreas BäckerII

17-Sep-04 4:35

Hi
have solved the problem

with
CreateDIBitmap

bye

Webcam

Member 136868816-Sep-04 1:12

Member 1368688

16-Sep-04 1:12

Hello everybody

I have one question.I want to get some pictures with a webcam. I wrote my Software with Visual C++. It is a Dialog class (MFC). Itried it with capCreateCaptureWindow but it doesn't work.

I hope someone can help me

See you
Michael

Re: Webcam

geo_m16-Sep-04 5:24

geo_m

16-Sep-04 5:24

Webcams usually provide some sort of web server, that you can download it from there and then you can display it (as jpeg probably)
But without further info, it's difficult to say how can you do it.

wav file resampling

sinha_abhijeet16-Sep-04 0:52

sinha_abhijeet

16-Sep-04 0:52

Hi,
I am new to VC++.
How do I resample(upsample/downsample) any wave file to a predefined value. Basically how do I change the attributes denoted by the WAVEFORMATEX structure, of an already existing file. (for example I have to convert any wav file into 8 khz 16 bit, PCM). The file will be an already existing one and not one to be recorded.
Thanx in advance.

Re: wav file resampling

Alexander ^M.,16-Sep-04 9:49

Alexander ^M.,

16-Sep-04 9:49

It's just a matter of math skills. I'm sorry, but I suggest you first read some articles about that.

Don't try it, just do it! Wink | ;-)

Getting IPv6 address

Alpha Siera16-Sep-04 0:47

Alpha Siera

16-Sep-04 0:47

Hi,

How can I reterive IPv6 address of system. Which API I can use for this.

Thanks for Reply

Regards
Alpha

Re: Getting IPv6 address [modified]

Antony M Kancidrowski16-Sep-04 2:31

Antony M Kancidrowski

16-Sep-04 2:31

Look at getaddrinfo()

in the addrinfo struct there is a sockaddr struct which can have either an ipv4 or ipv6 structure.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)

Re: Getting IPv6 address [modified]

Alpha Siera16-Sep-04 18:27

Alpha Siera

16-Sep-04 18:27

Hi,

This is ok. But i want to know all adapters which are present in the system along with their IPv6 ip addresses.getaddrinfo is socket call. I have tried IP Helper function GetAdaptersAddresses but I don't know it's not returning me IPv6 address. I am getting all details of adapter but not IP address.

Thanks for reply

Regards
Alpha

file

swarup16-Sep-04 0:46

swarup

16-Sep-04 0:46

hi i want to open an exe as a file in my application. in my dialog box app there is a button when i click on that it will open a exe as a file and search for suppose "t".

how can i open an exe as a file and how to replace a char or string in it.

swarup

Re: file

Paolo Ponzano16-Sep-04 2:23

Paolo Ponzano

16-Sep-04 2:23

I think you use the GetOpenFileName() to open the exe file
the you need an handle in order to open file using CreateFileA

<br />
HANDLE hFile=CreateFile(filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, NULL, NULL);<br />

at this point you should have an handle to your exe file, now we read it into memory using ReadFileA

<br />
DWORD BR=0; //numbers of bytes read by readfile<br />
char *tempbuff=(char*)calloc(dFileSize,sizeof(char));<br />
<br />
ReadFile(hFile, tempbuff, dFileSize, &BR, NULL);<br />
<br />
if( BR < dFileSize){<br />
//Process the error, since not all file could have been read<br />
}<br />

now we search the string you're looking for

<br />
char *p=NULL;<br />
p=strstr(tempbuff,"TEXT_TO_BE_SEARCHED");<br />
if( p==NULL) // no TEXT_TO_BE_SEARCHED found in tempbuff<br />
else you've the first occurrence<br />

for writing you do the same using WriteFile,
bye
Paolo

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