Re: Webcam - C / C++ / MFC Discussion Boards

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

Re: file

swarup18-Sep-04 2:06

swarup

18-Sep-04 2:06

After reading the tempbuff. the size of it is showing as 3. i want to read the whole file.

swarup

Windows .libs

JensB16-Sep-04 0:27

JensB

16-Sep-04 0:27

Hi,

I have some MFC projects which use the following libs:
kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib

Are these libs always necessary for using MFC? How can I know which libs to use and will I get errors compiling/linking when those deleted from the project?

Best regards,
Jens

Re: Windows .libs

geo_m16-Sep-04 5:20

geo_m

16-Sep-04 5:20

They are ignored if not used, if there's a lib missin, you will get an linker error that there's some function missing.

hope that helps

DLL

swarup16-Sep-04 0:03

swarup

16-Sep-04 0:03

HI there
how to create a dll and how to use it can anybody tell me. if i create a dll and dont use a def file does it export a dll.
DLL_API int fnDll(void)
{
return 42;
}

#ifdef DLL_EXPORTS
#define DLL_API __declspec(dllexport)
#else
#define DLL_API __declspec(dllimport)
#endif

and rest of the code.

if i dont use a def file i think i canot export that function. is that so.

swarup

Re: DLL

Paolo Ponzano16-Sep-04 2:31

Paolo Ponzano

16-Sep-04 2:31

declare the funcion you want to export as

<br />
extern "C" __declspec( dllexport) BOOL Function(char *buffer,char *tg);<br />

in your DLL project

In the Project that need the function do

declare in header file

<br />
extern "C" __declspec( dllimport ) BOOL Function(char *buffer,char *tg);<br />

<br />
HANDLE hDLL=LoadLibrary("dllname");<br />
if(hDLL == NULL)<br />
{<br />
//handle error<br />
}<br />
<br />

hope it helps
Paolo

Thread

swarup16-Sep-04 0:00

swarup

16-Sep-04 0:00

hi there

can anybody give a sample or example in how to create a thread and what's it use and how to use it.

swarup

Re: Thread

RChin16-Sep-04 0:23

RChin

16-Sep-04 0:23

This[^] is a very good intro to multi-threaded programming.

I Dream of Absolute Zero

Disable Restart from the windows shutdown dialog box

sirtimid15-Sep-04 23:14

sirtimid

15-Sep-04 23:14

Does anyone know how can I remove the "Restart" and "Log off" options from the shutdown dialog box of the WindowsXP in VC++?

Thanks in advance!

Disable Restart from the windows shutdown dialog box

sirtimid15-Sep-04 23:13

sirtimid

15-Sep-04 23:13

Does anyone know how can I remove the "Restart" and "Log off" options from the shutdown dialog box of the WindowsXP?

Thanks in advance!

Deleting ODBC Datasources

si_6915-Sep-04 23:00

si_69

15-Sep-04 23:00

Hi All

does anyone know how to programatically delete ODBC datasources
or can anyone point me in the right direction ?

thanks

Si Smile | :)

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