C / C++ / MFC

how to pass data in a file after reading

6-Jul-07 6:27

CWinApp::SetRegistryKey() determines where it goes.

Under that key will be an appname key.

Under that key will be keys specified in the lpszProfileName parameter of SaveState().

You can always step into the MFC code in the debugger and see the actual key strings.

Mark

This episode brought to you by the number 5

NalBH5-Jul-07 20:20

NalBH

5-Jul-07 20:20

dear all

my prob:
how can i pass data in a file after reading the file in C.i want to encrypt data of this file after reading the file.i know i cn use f commands to read data but want to pass the data later in second part of my program.

sorry for any mystype..am typing with 1 eye.
\
plz advice

thanks

CPallini5-Jul-07 20:28

5-Jul-07 20:28

Please be more specific, write what you was able to do so far and what you're not able to accomplish.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

NalBH6-Jul-07 2:30

NalBH

6-Jul-07 2:30

Hello

Thx for replying

My prob is that i have a file in notepad.I want to call that file in C.That i Know!But my prob is that i hv to use the data in this file for encryption.In fact i want to call a file so as to pass more data.I can read the data in the file but i want to use this data later in my program:i want to know th data_length.But here ion the code i have specified the num of char.But say i dont want to specify.I want my program to count the num of char in my file.Then i want it to encrypt the data.How can i pass those data.How can i store in it in an array.I cn printf the data..but i want to use the data.How can i use that.

FILE *fp;<br />
int noc;<br />
 char test[80];<br />
<br />
char ch;<br />
fp = fopen("/TC/MODPROJ/PR1.TXT","r");<br />
<br />
while (1)<br />
{<br />
ch=fgetc(fp);<br />
if (ch==EOF)<br />
 break;<br />
noc++;<br />

I am trying to encrypt using a key.The program is working fine when the data is within the code.But i want to call a file.

Please advice

Thanks

NB

CPallini6-Jul-07 2:58

6-Jul-07 2:58

I'm able to understand only a bit of what you wrote. I guess that you need to:
(1) open a text file
(2) Read the file content into a buffer
(3) Encrypt buffer content
(4) (Perhaps) Write the encrypted data to a new file

Now, waht are the steps you're able to do and, on the other hand, what are the problems you're unable to deal with?
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Hey Tom, are you doing a survey?

David Crow6-Jul-07 3:03

David Crow

6-Jul-07 3:03

Your code snippet likely doesn't work because: 1) you are not initializing noc, and 2) you are doing nothing with ch. Try:

noc = 0;
while (1)
{
    ch = fgetc(fp);
    if (EOF == ch)
        break;
 
    test[noc] = ch;
    noc++
}

Make sense?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Function-style cast

tom groezer5-Jul-07 20:03

tom groezer

5-Jul-07 20:03

Where exactly do we use function-style casts?

CPallini5-Jul-07 20:16

5-Jul-07 20:16

Regards,

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Mark Salsbery5-Jul-07 21:12

5-Jul-07 21:12

Or writing a book? Smile | :)

This episode brought to you by the number 5

tom groezer5-Jul-07 21:17

tom groezer

5-Jul-07 21:17

Would you like to be a chief editor

Mark Salsbery6-Jul-07 5:07

6-Jul-07 5:07

As long as it doesn't require any actual work!

This episode brought to you by the number 5

toxcct5-Jul-07 23:38

toxcct

5-Jul-07 23:38

check this[^]...

dumb boys never change i see... Sleepy | :zzz:

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Strange VC++ Debugger behavior

David Crow6-Jul-07 3:06

David Crow

6-Jul-07 3:06

toxcct wrote:
dumb boys...

I see no reason to resort to name-calling. If you don't agree with his practices, simply press the "ignore" button.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Function-style cast

Nuxser5-Jul-07 20:47

Nuxser

5-Jul-07 20:47

http://www.warpspeed.com.au/cgi-bin/inf2html.cmd?..%5Chtml%5Cbook%5CIBMVACPP%5CCPPLNG.INF+184

Though no example but made clear points of how function-style cast behaves in C++.

Axonn Echysttas5-Jul-07 19:45

Axonn Echysttas

5-Jul-07 19:45

Hi : D.

I'm running XP SP2 and Visual C++ 6 SP 6. I'm very curious about why this behavior occurs. If I call this function while I'm debugging, it works!

ExitWindowsEx(EWX_POWEROFF, 0);

But if I run the debug-built or even release-built executables from my hard disk, it does't work! Why!? This is very strange. From the debbuger, the computer starts shut down procedure, but otherwise, no way.

Thank you...

-= E C H Y S T T A S =-
The Greater Mind Balance

Blending C++ with COM ^

Re: Strange VC++ Debugger behavior

Axonn Echysttas5-Jul-07 20:25

Axonn Echysttas

5-Jul-07 20:25

Hm. Found my own answer in the meantime. Apparently, the VC++ IDE has administrator privileges. If you're a little program like me, check this out:

http://msdn2.microsoft.com/en-us/library/aa376868.aspx (see SE_SHUTDOWN_NAME)
http://msdn2.microsoft.com/en-us/library/aa375202.aspx

...and for a nice example...

http://msdn2.microsoft.com/en-us/library/aa376871.aspx

-= E C H Y S T T A S =-
The Greater Mind Balance

Blending C++ with COM ^

Re: Strange VC++ Debugger behavior

CPallini5-Jul-07 20:26

Re: Strange VC++ Debugger behavior

5-Jul-07 20:26

Privileges, mon ami, privileges (I suppose...)! Big Grin | :-D

MSDN [^] states

To shut down or restart the system, the calling process must use the AdjustTokenPrivileges function to enable the SE_SHUTDOWN_NAME privilege. For more information, see Running with Special Privileges.

Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Axonn Echysttas5-Jul-07 20:59

Axonn Echysttas

5-Jul-07 20:59

We replied in the same time : D.

Thank you anyway! Appreciated.

-= E C H Y S T T A S =-
The Greater Mind Balance

Blending C++ with COM ^

But you had an advantage...

CPallini5-Jul-07 22:14

Error in open() function in CDaoDatabase class of MFC-> Unhandled exception in myProject.exe(DAO360.DLL):0xc0000005:Access

5-Jul-07 22:14

You hadn't to read the OP.
Big Grin | :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

aaaan5-Jul-07 18:45

aaaan

5-Jul-07 18:45

Hi!
I m working on a database project in which i use CDaoDatabase class of MFC
to create the connection with a Access .mdb file by using its open()
function. and then use CDaoQueryDef class to save the query in the database.
It works well when I run my program first time for a database but if I
select the another or same Access .mdb file without closing the exe of my project it give error in its open
function. the error msg is somthing like this-> Unhandled exception in
myProject.exe(DAO360.DLL):0xc0000005:Access violation.

Pls help me to solve this problem as early as possible.

Ansh

Re: Error in open() function in CDaoDatabase class of MFC-> Unhandled exception in myProject.exe(DAO360.DLL):0xc0000005:Access [modified]

Mark Salsbery5-Jul-07 18:56

Re: Error in open() function in CDaoDatabase class of MFC-> Unhandled exception in myProject.exe(DAO360.DLL):0xc0000005:Access

5-Jul-07 18:56

Maybe try wrapping methods that can throw exceptions in try/catch blocks.
Then you can get detailed error info.

try
{
...try database open
}
catch (CDaoException *e)
{
... examine exception/error info here
e->Delete();
}

*EDIT* Besides checking for exceptions - are the string pointers you pass to Open() valid?<br />
(Thanks Steve!)

Mark

-- modified at 1:41 Friday 6th July, 2007

Mark Salsbery
Microsoft MVP - Visual C++

"Go that way, really fast. If something gets in your way, turn."

Stephen Hewitt5-Jul-07 19:31

Stephen Hewitt

5-Jul-07 19:31

It looks like the exception was an access violation and so your code will not catch it.

Steve

Re: Error in open() function in CDaoDatabase class of MFC-> Unhandled exception in myProject.exe(DAO360.DLL):0xc0000005:Access

Mark Salsbery5-Jul-07 19:37