Re: Difference between .h and no .h - C / C++ / MFC Discussion Boards

David Crow2-Aug-06 2:59

2-Aug-06 2:59

we3Guy wrote:
he wants me to encrypt the image... then dsplay it out beore saving it up...CAN ANYONE PLEASE HELP ME WITH MY PROBLEM????

So what exactly are you having difficulty with? Encrypting an image, displaying an image, or saving an image to disk? Three different questions require three different answers.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

Re: To Sarath..........

we3Guy2-Aug-06 3:19

we3Guy

2-Aug-06 3:19

my question was....

i'm doing this project whereby,

i have a "load" button that enables me to display a picture in bitmap format...
Next i have to encrypt the picture and display it again..

and decryption as well in future

Thanks
Regards

Re: To Sarath..........

David Crow2-Aug-06 3:39

David Crow

2-Aug-06 3:39

we3Guy wrote:
Next i have to encrypt the picture...

Well, there's CRAPI, and then there are these:

http://www.codeproject.com/cpp/encrypt.asp
http://www.codeproject.com/file/aencrypt.asp
http://www.codeproject.com/cpp/cryptit.asp
http://www.codeproject.com/cpp/blowfish.asp
http://www.codeproject.com/cpp/aes.asp
http://www.codeproject.com/cpp/xor256.asp
http://www.codeproject.com/cpp/EncryptionCryptoAPI.asp

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

Re: To Sarath..........

we3Guy2-Aug-06 15:28

we3Guy

2-Aug-06 15:28

Thanks for the websites they were nicely writtened.... but.... they were not very useful to me... thanks anyway....

by the way,erm.......

if i want to do editing to the image, do i take the pixels of the image or the array bytes of the image? AND.... how should i go about doing it?

THANKS~!!!!

Best Regards

Difference between .h and no .h [modified]

HakunaMatada1-Aug-06 18:28

HakunaMatada

1-Aug-06 18:28

What is the difference between

#include (iostream.h)

and

#include (iostream).

Are they different? If so, what are their differences?

-- modified at 0:29 Wednesday 2nd August, 2006

---

Hakuna-Matada Beer | [beer]

It means no worries for the rest of your days...
It's our problem free, Philosophy
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Re: Difference between .h and no .h

_AnsHUMAN_ 1-Aug-06 18:47

_AnsHUMAN_

1-Aug-06 18:47

Hakuna-Matada wrote:
#include (iostream.h)

To link to Old Standard C++ Library

Hakuna-Matada wrote:

#include (iostream).

Used to link to New Standard C++ Lib
In the new C++ lib there are some differences . For ex
1)open functions do not take a third parameter (the protection parameter).
2)You cannot create streams from file handles. etc....

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: Difference between .h and no .h

Heinz_1-Aug-06 18:48

Heinz_

1-Aug-06 18:48

I think iostream.h is keept for backwards compatibility, all the old and new stuff is in iostream, don't know why they switched.

Re: Difference between .h and no .h

Zac Howland4-Aug-06 9:06

Zac Howland

4-Aug-06 9:06

Just FYI: They didn't switch. The .h versions were non-standard. That is, they were what everyone used before there was a standard. The problem was that each system implemented them slightly differently. When the standard was released, most systems kept the .h versions for backward compatability. They are now being phased out of almost all systems completely.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

merge two projects

thathvamsi1-Aug-06 16:14

thathvamsi

1-Aug-06 16:14

Hey all,
I have two differnet projects coded in VC++6.0 version. I want to merge both the projects. How do I do it?

ie., Project2 needs to be included in project1. Can the project as a whole be added or just the files, say, include the cpp and .h files from project2 in to project1?

What is the best way to do it?

Any ideas/help please?

Thanks in advance,
Anusha.

Re: merge two projects

Maxwell Chen1-Aug-06 17:02

Maxwell Chen

1-Aug-06 17:02

Basically, a "Workspace" in Visual C++ 6, or a "Solution" in Visual C++ 7.0 ~ 8.0, is what for holding one or more projects.

Maxwell Chen

Re: merge two projects

thathvamsi1-Aug-06 17:25

thathvamsi

1-Aug-06 17:25

thanks for ur response.
But If I include my project2 in my project 1 workspace, then I understand there can be two projects in one work space.
But What I need is to use .cpp and .h files from project2 in project1 and build them or can I build the two projects together?
Basically my project2 is dialog based and project1 is single document.

I want to use the project2dlg.cpp and project2dlg.h and all the relevant files that is dependant in to my project1.

Is htere a way I can do it or should I recode my project1 accordingly to just include the files n functions that I want from project2.

Hope this is clear. If u need any furhter info. please let me know.
Thanks.

Re: merge two projects

Vipin Aravind1-Aug-06 17:46

Vipin Aravind

1-Aug-06 17:46

Choose your project1 and then do a "add files to the project", point to the files you want to be part of project1.

Vipin - MS MVP
http://www.explorewindows.com/Blogs/index.php

Re: merge two projects

thathvamsi1-Aug-06 18:00

thathvamsi

1-Aug-06 18:00

How do I add my resource file from project2 to project1.
Is there a way?
or do I have to redo the dialog resource/page in project2 again in project1?

Looking for a Library...

Bob X1-Aug-06 15:32

Bob X

1-Aug-06 15:32

I'm looking for a library which will allow me to get the widths of various images, the color of a specific pixel, change the color of a specified pixel, etc... Basically a simple image manipulation library.

Thanks in advance Smile | :)

Re: Looking for a Library...

valikac1-Aug-06 16:15

valikac

1-Aug-06 16:15

gdi+ and/or freeimage

Kuphryn

Re: Looking for a Library...

bob169721-Aug-06 18:07

bob16972

1-Aug-06 18:07

I second that (GDI+ that is)

Wonderful little library for images and Font rendering. A little slow and kinda peculiar but you gotta love it.

Re: Looking for a Library...

Bob X2-Aug-06 11:14

Bob X

2-Aug-06 11:14

Thanks for the tip.

Can a program minimise itself ?

cgb1431-Aug-06 11:51

cgb143

1-Aug-06 11:51

Is there a way a program can command itself to run minimised.
After the program has started I want to send it a remote command to minimise itself and continue running.

Re: Can a program minimise itself ?

Jörgen Sigvardsson1-Aug-06 12:50

Jörgen Sigvardsson

1-Aug-06 12:50

::ShowWindow(hWnd, SW_MINIMIZE);

--
Coming Soon to an Illegal DVD

"this" pointer for thread seems does not work [modified]

zhijia.yuan1-Aug-06 11:38

zhijia.yuan

1-Aug-06 11:38

hi,
here is my weird question:
i defined a class:
Class CMyClass:: Public CWnd
...

then, i defined a function in another CPP file as threadproc.
UINT mythreadproc(LPVOID lpvoid)
{...
(CMyClass *) lpvoid;
...
}

and then, i tried to start the thread in a member function of CMyClass
CMyClass::Function1()
{
...
::AfxBeginThread(mythreadproc,this,THREAD_PRIORITY_NORMAL,NULL,NULL,NULL);

...
}

i used this because this thread just does some Drawing working periodically, and i want the lpvoid point to parent window so that i can ge the dc and client rect for drawing,
but the question is: i debugged the program, it seems the lpvoid is different from the "this " pointer point to the CMyClass object..what happened??

...

-- modified at 17:39 Tuesday 1st August, 2006

Re: "this" pointer for thread seems does not work

Michael Dunn1-Aug-06 19:33

Michael Dunn

1-Aug-06 19:33

In MFC, you can't access certain kinds of objects from a different thread than the one that created the object. CWnd is one of those kinds. Also, doing GDI operations from a thread different than the one that created the window is not advisible because it will result in lots of context switches (and it may not even work at all in Vista with its new desktop composition).
The preferred way is to have the thread post a message to the window (post to the HWND, not the CWnd) when drawing needs to be done. That way, the drawing happens on the UI thread.

--Mike--
Visual C++ MVP Cool | :cool:

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Can't send register value to port 0x43

Heinz_1-Aug-06 11:00

Heinz_

1-Aug-06 11:00

Hi, with assembler code embedded in my c++ code i'm trying to send a value to I/O port 0x43 (8254 timer control) but the program crashes at this point, i'm using digital mars c++ compiler wich has an inline assembler, also tried mingw and it's worst (it doesn't even compile), here are the asm lines:

asm
{
mov AL, 0xB6;
out 0x43, AL; // It crashes in this line.
mov AL, 54;
out 0x42, AL;
mov AL, 124
out 0x42, AL;
in AL, 0x61;
or AL, 0x3;
out 0x61, AL;
in AL, 0x61;
and AL, 0xFC;
out 0x42, AL;
}

I've also tried embedding this code into other languages like D, but it throws a win32 exception.

What's wrong man? thx

Rice Compression

masnu1-Aug-06 9:32

masnu

1-Aug-06 9:32

Does anyone know where I could find some good articles and examples on how to implement a Rice compression scheme in C++. The web has several articles but they seem to be for very specific cases.

Thanks.

Re: Rice Compression

David Crow1-Aug-06 10:22

David Crow

1-Aug-06 10:22

How about this one?

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

Re: Rice Compression

masnu1-Aug-06 10:25

masnu

1-Aug-06 10:25

Which one? sorry, I didn't get the link.

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