C / C++ / MFC Discussion Boards

David Crow31-Mar-06 7:17

31-Mar-06 7:17

But it is potentially a timing problem where your program is trying to use the DLL before it has been registered. By registering at a command prompt, or through an actual install-type program, you've eliminated this possibility.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

How to encrpyt a file and decrpyt on the fly

beko31-Mar-06 3:32

beko

31-Mar-06 3:32

Hello All,

I have a program which uses a XML file for initialisation of the program. Now i have to make that XML file scrambled or decoded in order to give to the end user. (it was not required in the beginning of the project)

How can i encrypt a file(since i need to modify couple of other files not just an XML file) and decrpyt on the memory without creating a temporary decrypted file?

Actually i can encrypt the file but i don't know how to decrypt the file on the memory into a text-based XML file and then use it as i used to do.

can Memory File Mapping be used for this? (i just heard it but never used)

or is there any other simple way?

I am currently using TinyXML and standard C++ streams for data reading.

Thanks

Re: How to encrpyt a file and decrpyt on the fly

David Crow31-Mar-06 3:57

David Crow

31-Mar-06 3:57

beko wrote:
How can i encrypt a file...

Have you considered the Crypto API? (CRAPI)? Have you checked for articles here on CP? Have you Googled for examples?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: How to encrpyt a file and decrpyt on the fly

beko31-Mar-06 22:03

beko

31-Mar-06 22:03

i didn't look at the Crpyto API,however i have done encrpytion of a file before. That was not a problem, it was a license file and i was encrypting and writing to a file and reading as binary, checking the date etc. (i searched in google and codeproject about encryption before doing this)

now i am going to look at Crypto API, i have seen two articles on codeproject.

Thanks for the pointer.

how can i add DLL file in my application

baldha rakesh31-Mar-06 2:27

baldha rakesh

31-Mar-06 2:27

i want to add a dll file in MFC dialog base application and use it,

i am using this dll by create instancs by CoCreateInstance(...) but i want to other shortcut method id there is any other shotcut method please answer me.

Bankey Khandelwal
Software Engineer

Re: [OT]

kakan31-Mar-06 2:51

kakan

31-Mar-06 2:51

Be nice, there are other OS:es than Windows to code in...;P

Re: [OT]

kakan31-Mar-06 2:57

kakan

31-Mar-06 2:57

Ok, then I know. Did anyone tell the guy there are such things as books? Or a quite good (IMO) search engine called Google? Laugh | :laugh:

Re: [OT]

Toby Opferman31-Mar-06 21:45

Toby Opferman

31-Mar-06 21:45

If he wasn't coding in windows it wouldn't say "Software Engineer" it would say "Unemployed". Smile | :)

8bc7c0ec02c0e404c0cc0680f7018827ebee

Re: how can i add DLL file in my application

Cedric Moonen31-Mar-06 2:53

Cedric Moonen

31-Mar-06 2:53

CoCreateInstance is used with COM technology, which is a particular type of DLL.

Bankey Khandelwal wrote:
i want to add a dll file in MFC dialog base application and use it,

If you simply what that (and nothing to do with COM or ActiveX or else), you can simply add the header files to your project (implicitlinking) and lin to the library supplied with your dll. The second method (which is explicit linking) is to load your dll with LoadLibrary then retrieve functions pointers in it (you need to know the name of the exported functions) with GetProcAddress.

Re: how can i add DLL file in my application

Laxman Auti31-Mar-06 17:53

Laxman Auti

31-Mar-06 17:53

#ifdef _DEBUG

#import "\Test\ATL Dialog\Debug\NewATLAttach.dll" raw_interfaces_only, raw_native_types, no_namespace, named_guids

#else

#import "\Test\ATL Dialog\Release\NewATLAttach.dll" raw_interfaces_only, raw_native_types, no_namespace, named_guids

#endif

Create the object using CoCreateInstance and use the methods

Knock out "T" from CAN'T
You 'CAN' if you think you 'CAN'
Cool | :cool:

How to create an AVI file from a compressed buffer?

dvillet31-Mar-06 1:45

dvillet

31-Mar-06 1:45

Hello,

I’m trying to create an AVI File (using the API VfW) where data are already compressed. Frames are already compressed by my board grabber, and my application just receive in a shared memory the compressed buffer.
I created a BITMAPINFOHEADER struct and an AVISTREAMINFO struct to create the stream associated to my open AVI file.

m_pBitmapInfo->biSize= sizeof(BITMAPINFOHEADER); <br />
m_pBitmapInfo->biPlanes= 1; <br />
m_pBitmapInfo->biBitCount= 24; <br />
m_pBitmapInfo->biCompression= mmioFOURCC('d','i','v','x'); <br />
m_pBitmapInfo->biClrUsed= 0; <br />
m_pBitmapInfo->biClrImportant= 0; <br />
m_pBitmapInfoHeaderPos->biSizeImage= m_bufferSize;//size of the compressed buffer<br />
m_pBitmapInfoHeaderPos->biWidth= SizeX;//size of the src 352*288 <br />
m_pBitmapInfoHeaderPos->biHeight = SizeY; <br />
... <br />
<br />
m_pAviStreamInfo.fccType= streamtypeVIDEO; <br />
m_pAviStreamInfo.fccHandler= mmioFOURCC('d','i','v','x'); <br />
m_pAviStreamInfo.dwScale= 1; <br />
m_pAviStreamInfo.dwRate = 5;       <br />
m_pAviStreamInfo.dwSuggestedBufferSize= m_pBitmapInfo->biSizeImage; <br />
RECT RectImageSize = { 0, 0,SizeX ,SizeY}; <br />
m_pAviStreamInfo.rcFrame= RectImageSize; <br />
<br />
... <br />
hr = AVIFileCreateStream(m_pAviFile, &m_psAvi, &m_pAviStreamInfo); <br />
... <br />
hr = AVIStreamSetFormat(m_psAvi, 0, m_pBitmapInfo, m_pBitmapInfo->biSize);

Then, I wrote the frame:

hr = AVIStreamWrite   (m_psAvi, images, 1, m_pCurrentBuffer, m_bufferSize, AVIIF_KEYFRAME, &plSampWritten, &plBytesWritten);

At the end of the process, my file is too big and I have only a black display.
If I ask my grabber to not compress the video source I have no problem to create my AVI file using the API VfW…

I don't understand what is wrong...

Is there anybody that has an idea?

Thank your.

Re: How to create an AVI file from a compressed buffer?

Hamid_RT31-Mar-06 2:31

Hamid_RT

31-Mar-06 2:31

Hi dvillet,
I saw in examples MSDN how to create Avi file
that you can see for cerate Avi (I think this example is create number 9,8,7...)

Re: How to create an AVI file from a compressed buffer?

dvillet31-Mar-06 2:52

dvillet

31-Mar-06 2:52

I already saw examples MSDN how to create Avi file but nothing to help me.
Do you remember where exactly?
Thank you.

Re: How to create an AVI file from a compressed buffer?

Hamid_RT31-Mar-06 3:14

Hamid_RT

31-Mar-06 3:14

Dear dvillet,
I found most video examples, but I cant find this example
if i find this example I post this link to you

Re: How to create an AVI file from a compressed buffer?

dvillet31-Mar-06 3:17

dvillet

31-Mar-06 3:17

thank you

Re: How to create an AVI file from a compressed buffer?

Hamid_RT31-Mar-06 8:14

Hamid_RT

31-Mar-06 8:14

Hi dvillet,

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcsample98/html/vcsmpwriteavi.asp[^]

regarding focus

yang__lee31-Mar-06 0:32

yang__lee

31-Mar-06 0:32

Gurus,

I have MDI MFC application .

I click a menu item and a modeless dialog CPalette is created.
void CMainFrame::OnToolsOpenpalette()

I have added a variable to CMainFrame i.e. CPalette *mypal;

Now real problem is When this dialog is displayed it gets all the focus and my main frame, view loses focus and there is some color change in the title bar of these windows. If focus gets to frame or view then dialogs loses focus and some color change occurs to dialog title. which is very irritating.

I dont want this. I want the CPalette dialog to look like a component of MainFrame. There should not be any color change (like when we click on MDI view, Frame doesnt lose any focus.)

(This palette will be having icons which will be clicked to invoke some graphic commands and should be applicable to multiple view)

How to get this result?

Thanks

Lee

Re: regarding focus

FarPointer31-Mar-06 4:32

FarPointer

31-Mar-06 4:32

If you want your main window to also have the activated color send a WM_ACTIVATE Notification mesage to that window.

Regards,
FarPointer

Re: regarding focus

FarPointer31-Mar-06 4:33

FarPointer

31-Mar-06 4:33

You have posted the same message twice ,if it was by mistake please take the pain to delete this message ,why making CP(lose space) Smile | :)

Regards,
FarPointer

how to stream video files

ramyasangeet31-Mar-06 0:08

ramyasangeet

31-Mar-06 0:08

hi all,

I have created a player in vc++ 6.0 which plays video files.
If i play two video files at a time,one file is crashing.
can i able play 2 video files simultaneously.how can i do that.Also please tell me "how to stream video files in vc++".

Thanks in advance

cheers

sangeet

Re: how to stream video files

Hamid_RT31-Mar-06 2:28

Hamid_RT

31-Mar-06 2:28

Hi ramyasangeet ,
Hope I understood your question you need to play video files(avi,mpg,...)
I Played 4 video files and no problem
I use MCI to paly in 4 video files in 4 windows
plaese use functions MCI(I use vs2003)

printdlg not working

_tasleem31-Mar-06 0:03

_tasleem

31-Mar-06 0:03

hi all
i want to show the printer dialog using api.i had use this code from msdn.

PRINTDLG pd;
ZeroMemory(&pd, sizeof(pd));
pd.lStructSize = sizeof(pd);
pd.Flags = PD_USEDEVMODECOPIESANDCOLLATE | PD_RETURNDC;
pd.nMaxPage = 1;
if(PrintDlg(pd)==TRUE) this line give error that
d:\_Tasleem\BcGenerator 310306\Barcode Generator\PrinteBitmaps.cpp(61): error C2664: 'PrintDlgA' : cannot convert parameter 1 from 'PRINTDLG' to 'LPPRINTDLGA'
No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called

i tried to use by declaring onject of LPPRINTDLGA but it had no member data i.e LPPRINTDLGA pd;
pd.mMaxPage=1;

Tasleem Arif

Re: printdlg not working

Ștefan-Mihai MOGA31-Mar-06 0:21

Ștefan-Mihai MOGA

31-Mar-06 0:21

PRINTDLG pd;
ZeroMemory(&pd, sizeof(pd));
pd.lStructSize = sizeof(pd);
pd.Flags = PD_USEDEVMODECOPIESANDCOLLATE | PD_RETURNDC; 
pd.nMaxPage = 1; 
if(PrintDlg(&pd)==TRUE)

(I think you need to specify a reference to that variable)

Re: printdlg not working

_tasleem31-Mar-06 0:25

_tasleem

31-Mar-06 0:25

thank u it works

Tasleem Arif

Re: printdlg not working

Hamid_RT31-Mar-06 2:41

Hamid_RT

31-Mar-06 2:41

maybe it is some helpful to you

DOCINFO di;
PRINTDLG pd;

memset((void *)&pd, 0,sizeof(PRINTDLG));

pd.lStructSize = sizeof(PRINTDLG);
pd.hwndOwner = this->m_hWnd;
pd.Flags =PD_RETURNDC|PD_ENABLESETUPTEMPLATE;
pd.hInstance = NULL;
pd.nMaxPage=1;
pd.nMinPage=1;
pd.nCopies=1;
pd.hDevMode=lpdevmode;
pd.nFromPage=1;
pd.nToPage=1;

PrintDlg(&pd);

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