C / C++ / MFC Discussion Boards

Re: RTC data (date time) retreival problem

Mike Nordell30-Jan-03 12:40

30-Jan-03 12:40

Sandeep Shetty wrote:
Can it be the case that RTC is busy updating some registers

Anything is possible when dealing with PC hardware. Smile | :)

But I'd more worry about the possible implications of you emitting e.g.

out 0x70, 2 /* minute */

then your driver is interrupted by Windows itself wanting to access the RTC (which I presume it assumes it has exclusive access of), emitting e.g.

out 0x70, 0
out 0x71, 0 /* set seconds to zero */

and voila, your driver fails. For all I know, the RTC might even have deadlocked at this point.

Coming to think of it, is even 0x70-0x73 shared? (you have successfully claimed the address range, by e.g. IoAssignResources?)

Re: RTC data (date time) retreival problem

Sandeep Shetty30-Jan-03 18:42

Sandeep Shetty

30-Jan-03 18:42

Hello!!

Thank you for your answer.
But I am not using statements like "out 0x70, 2". I am using the macro WRITE_UCHAR_PORT and READ_UCHAR_PORT and pass 0x70 and 0x71 as parameters.

I do not think we have to claim addresses and the macro does require on its own.

I cam across a small article at site http://www.pcprofile.com/timepiece.HTM#overview
There is some problem in chip set INtel 810. Can you please on this?

Hope I am on the right track.

Please give your suggestions.

regards,Sandeep

Re: RTC data (date time) retreival problem

Mike Nordell30-Jan-03 21:03

Mike Nordell

30-Jan-03 21:03

Sandeep Shetty wrote:
But I am not using statements like "out 0x70, 2".

I understand that. I just used that as syntax to keep down on the writing.

I do not think we have to claim addresses

Is think really a good word to use when dealing with stuff like this? Wink | ;-)

But it also seems you have to check whether an update is in progress before trying to read anything. Have a look at this for example.

I still don't think you are allowed to do this without either disabling interrupts (which I'm quite certain you may not on NT) or claiming the resources you access - even more so since the built-in "System CMOS/real time clock" device already have claimed this I/O range.

Memory Usage

Shah Shehpori29-Jan-03 21:19

Shah Shehpori

29-Jan-03 21:19

Friends, at some point of my program execution, i want the memory consumption of my program (same value that we read from task manager). Any API solution that also work for Win 98 do tell me please ?

Re: Memory Usage

Mike Nordell30-Jan-03 21:05

Mike Nordell

30-Jan-03 21:05

Shah Shehpori wrote:
i want the memory consumption of my program (same value that we read from task manager). Any API solution that also work for Win 98 do tell me please ?

Since when did Win98 get a Task Manager?

Whatever. Try GetProcessWorkingSetSize.

replacing and resizing contols on formview on change in window size

sulaxan29-Jan-03 20:52

sulaxan

29-Jan-03 20:52

REQUIREMENT:: Application shud be sized to full monitor irrespective of the monitor size and current system resolution.
My APPLICATION:: Application is having four formviews in tabcontrol with many controls(AcitveX Lables and Buttons) on each forma view. My application is developed for best view in 15 inch and 800*600 resolution.

MY PROBLEM: i have written code to catch when resolution ic changed.and accorind to the new resolution m changing the each contols's client rect and moving the corresponding control to new client react. but reafreshing si becoming problem and some controls are painting over other controls.

adi narayana

Radio button

rohit.dhamija29-Jan-03 20:45

rohit.dhamija

29-Jan-03 20:45

I have a dialog based application with a group of 4 radiobuttons. I want one of 4 radiobutton to be active when form loads ?
So can i do it ??;P

Re: Radio button

xxhimanshu29-Jan-03 21:16

xxhimanshu

29-Jan-03 21:16

i can't undesratnd what you want...but I guess you need to place the code for radiobuttons so as to make them active...when form loads..in OnInitDialog function...if it is a dialog based application..just put the code in InitInstance() that should do the work you want..
cheers

Himanshu

Re: Radio button

Rage29-Jan-03 21:38

Rage

29-Jan-03 21:38

I'll just expand what Himanshu said :

First get a control to the button you want to active. Two ways to do it :
1.Add a control with the class wizard, let's name it m_FirstButton.
In the CMyDlg::OnInitDialog()

BOOL CMyDlg::OnInitDialog()
{
...stuff...
m_FirstButton.SetCheck(TRUE);
...stuff...
}

_or_

2.Get a control to it through the Index (IDC_...), like following :

BOOL CMyDlg::OnInitDialog()
{
...stuff...
CButton *firstbutton=(CButton*)GetDlgItem(IDC_FIRSTRADIOBUTTON);
firstbutton->SetCheck(TRUE);
...stuff...
}

And as Himanshu said, you can do some calculation also in the InitInstance (like processing the command line) if this is needed to chose which of your radiobutton should be active at startup.

~RaGE();

Re: Radio button

rohit.dhamija29-Jan-03 21:50

rohit.dhamija

29-Jan-03 21:50

GetDlgItem is giving errors
CButton *firstbutton=(CButton*)GetDlgItem(IDC_FIRSTRADIOBUTTON);firstbutton->SetCheck(TRUE);

Eek! | :eek:

GetDlgItem' : function does not take 1 parameters
Error executing cl.exe.

Re: Radio button

jhwurmbach29-Jan-03 22:07

jhwurmbach

29-Jan-03 22:07

Use a control-variable. You can make those with the Wizard, exactly like the Member variable, but you have to set the type to 'Control'.
Now, you have all options that the respective MFC-class offers.

Especially handy as your dialog grows.

My opinions may have changed, but not the fact that I am right.

Re: Radio button

Abbas_Riazi29-Jan-03 21:57

Abbas_Riazi

29-Jan-03 21:57

Just set your radio button member variable in dialog constructor. e.g.:

if your member variable is m_Options:

CDummyDlg::CDummyDlg()
{
	//{{{AFX_...
	m_Options = 0;	//first option, changed from m_Options=-1;
	//}}}AFX_...
}

A. Riazi

Re: Radio button

rohit.dhamija29-Jan-03 22:07

rohit.dhamija

29-Jan-03 22:07

Good Riazi that really worked !!! Big Grin | :-D

Re: Radio button

Rage29-Jan-03 23:02

Rage

29-Jan-03 23:02

Sorry, i had not thought that you could have used the value associated to your button (i prefer using controls). Riazi got me on this one. Poke tongue | ;-P

~RaGE();

Delete History of Internet?

xxhimanshu29-Jan-03 20:18

xxhimanshu

29-Jan-03 20:18

Hi all,
I want to delete the history, cache entries and cookies craeted by internet thru programming..Is there any good tutorial or can anyone guide me so as how to do it...Any thoughts and ideas are most welcome..
Thanks in advance..

Himanshu

Re: Delete History of Internet?

Abbas_Riazi29-Jan-03 22:08

Abbas_Riazi

29-Jan-03 22:08

Just call some shell function to retrieve folders of Temprory Internet Files and also History then delete all of files on it!
For more information on how to retrieve shell folders path, view my article: System Information[^].
A. Riazi

Re: Delete History of Internet?

Rohit Sinha30-Jan-03 1:51

Rohit Sinha

30-Jan-03 1:51

Take a look at this article:

http://www.codeproject.com/shell/surfhelper.asp[^]

Regards,

Rohit Sinha

Re: Delete History of Internet?

xxhimanshu30-Jan-03 2:02

xxhimanshu

30-Jan-03 2:02

thanks buddy..this was what I was looking for....thans a lot..
cheers

Himanshu

Encryption/Decryption

Zaid Ansari29-Jan-03 19:28

Zaid Ansari

29-Jan-03 19:28

i am using CALG_MD5 to encrypt/decrypt a string. it encryts the text but in decrypting it shows error "NTE_BAD_DATA" on lastblock other blocks are decrypted well. How can i resolve this erro.
Note:
final parameter is set to true for last block.

Re: Encryption/Decryption

karl_w29-Jan-03 21:39

karl_w

29-Jan-03 21:39

Zaid Ansari wrote:
am using CALG_MD5 to encrypt/decrypt a string

Are you sure you are using MD5 for encyrption/decryption? MD5 is an hash-algorithm so its result can't be "decrypted". Search the net for information about hashing vs. encrypting/decrypting. You could use algorithms like AES or DES for your needs.

--

karl

Re: Encryption/Decryption

Zaid Ansari29-Jan-03 22:03

Zaid Ansari

29-Jan-03 22:03

thanks karl,
i know that MD5 is a one way hash but i dont have any experiance in VC can u please tell me if i am making any mistake in this code.

to //code
if(!CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL,0))
{
}
// Create a hash object.
if(!CryptCreateHash(hCryptProv, CALG_MD5, 0, 0, &hHash))
{
strcat(strErrorMessage, "Error executing CryptCreateHash");
return NULL;
}

if(!CryptHashData(hHash, (BYTE *)password, strlen(password), 0))
{
strcat(strErrorMessage, "Error executing CryptHashData");
return NULL;
}
// Derive a session key from the hash object.
if(!CryptDeriveKey(hCryptProv, CONST_ENCRYPT_ALGORITHM, hHash, 0, &hKey))
{
strcat(strErrorMessage, "Error executing CryptDeriveKey");
return NULL;
}

// Destroy the hash object.
CryptDestroyHash(hHash);
hHash = 0;

// Determine number of bytes to encrypt at a time.
// This must be a multiple of CONST_ENCRYPT_BLOCK_SIZE.
// CONST_ENCRYPT_BLOCK_SIZE is set by a #define statement.
dwBlockLen = 10 - 10 % CONST_ENCRYPT_BLOCK_SIZE;
// get data block as close to 1000 bytes as possible making sure it's a multiple of ENCRYPT_BLOCK_SIZE

// Determine the block size. If a block cipher is used,
// it must have room for an extra block.
if(CONST_ENCRYPT_BLOCK_SIZE > 1)
dwBufferLen = dwBlockLen + CONST_ENCRYPT_BLOCK_SIZE;
else
dwBufferLen = dwBlockLen;

// Allocate memory.
pbBuffer = (BYTE *)malloc(dwBufferLen);
BYTE *pAllBlocks = NULL;
BYTE *pPreviousBlocks = NULL;
bool fMoreDataExists = true;
DWORD dwIndex = 0;
DWORD dwLength;
DWORD dwLengthOfEncryptedData;
DWORD dwAllBlocksLength, dwPreviousBlocksLength;

// Make way through data one block at a time. Find out how big
// each encrypted string will be, allocate memory for it, and save
// in array.
do
{
// get next block of clear text data
GetBYTEDataBlockFromString(dwIndex, pClearTextString, dwBlockLen, pbBuffer, dwLength);
// check if more data exists after current block

if (dwIndex >= strlen(pClearTextString))
fMoreDataExists = false;

// encrypt current data block
dwLengthOfEncryptedData = dwLength;
if(!CryptEncrypt(hKey, 0, !fMoreDataExists, 0, pbBuffer, &dwLengthOfEncryptedData, dwBufferLen))
{
fout<<"Error Occured in CryptEncrypt";
}
if (pAllBlocks)
delete [] pAllBlocks;
if (pPreviousBlocks)
dwAllBlocksLength = dwPreviousBlocksLength + dwLengthOfEncryptedData;
else
dwAllBlocksLength = dwLengthOfEncryptedData;

pAllBlocks = new BYTE[dwAllBlocksLength];
if (!pAllBlocks)
{
if(pbBuffer)
free(pbBuffer);
if (pPreviousBlocks)
delete [] pPreviousBlocks;
strcat(strErrorMessage, "Unable to allocate memory for pAllBlocks");
FreeAllCryptHandles(hKey, hHash, hCryptProv);
return NULL;
}
// copy all encrypted data to pAllBlocks

if (pPreviousBlocks)
{
CopyBYTEData(dwPreviousBlocksLength, pPreviousBlocks, pAllBlocks, dwAllBlocksLength, 0);
CopyBYTEData(dwLengthOfEncryptedData, pbBuffer, pAllBlocks, dwAllBlocksLength, dwPreviousBlocksLength);
delete [] pPreviousBlocks;
}
else
CopyBYTEData(dwLengthOfEncryptedData, pbBuffer, pAllBlocks, dwAllBlocksLength, 0);

if (fMoreDataExists)
{ // save previous data blocks for next iteration of this do loop
dwPreviousBlocksLength = dwAllBlocksLength;
pPreviousBlocks = new BYTE[dwPreviousBlocksLength];
if (!pPreviousBlocks)
{
if(pbBuffer)
free(pbBuffer);
if (pAllBlocks)
delete [] pAllBlocks;
strcat(strErrorMessage, "Unable to allocate memory for pPreviousBlocks");
FreeAllCryptHandles(hKey, hHash, hCryptProv);
return NULL;
}
else
CopyBYTEData(dwAllBlocksLength, pAllBlocks, pPreviousBlocks, dwPreviousBlocksLength, 0);
}
}
while(fMoreDataExists);

Re: Encryption/Decryption

Zaid Ansari29-Jan-03 22:05

Zaid Ansari

29-Jan-03 22:05

can any one send me code for encryption/decryption string using DES.

Re: Encryption/Decryption

karl_w30-Jan-03 0:08

karl_w

30-Jan-03 0:08

It's not DES, but it uses the Windows-CryptAPI.
On the other hand I'm quite sure there is a class outside in the wild which provides DES-encryption.

	<br />
HCRYPTPROV hCryptProv;<br />
HCRYPTKEY hKey;<br />
HCRYPTHASH hHash;<br />
<br />
if ( !CryptAcquireContext(&hCryptProv, NULL , NULL, PROV_RSA_FULL,  0))<br />
    AfxMessageBox("Error Acquire");<br />
<br />
if ( !CryptCreateHash(hCryptProv, CALG_MD5, 0, 0, &hHash))<br />
    AfxMessageBox("Error CreateHash");<br />
<br />
if ( !CryptHashData(hHash, (BYTE*) "YourKey", (DWORD)strlen("YourKey"), 0))<br />
    AfxMessageBox("Error Hashing");<br />
<br />
if ( !CryptDeriveKey(hCryptProv, CALG_RC4, hHash, 0, &hKey))<br />
    AfxMessageBox("Error Derive Key");<br />
<br />
BYTE* buf; //The thing you want to encrypt<br />
DWORD size = (DWORD)strlen((char*)buf);<br />
     <br />
CryptEncrypt(hKey, NULL, TRUE, 0, (BYTE*)buf, &size, size);<br />
<br />
CryptDecrypt(hKey, NULL, TRUE, 0, (BYTE*)buf, &size)<br />
<br />

This works fine for me. It's not a high-security app, so i hardcoded the encryption-key in the code. I simply took the Class-Name as key.

Hope I could help.

--

karl

Re: Encryption/Decryption

Zaid Ansari30-Jan-03 0:46

Zaid Ansari

30-Jan-03 0:46

i need simple DES encryption / decryption with hardcoded key. Thanks a lot Karl i will try this.

Re: Encryption/Decryption

Zaid Ansari3-Feb-03 5:02

Zaid Ansari

3-Feb-03 5:02

Thanks a lot Mr.Karl, it worked but now i have data which contanis 300 character but it encrypts forst 56 characters only. can u please tell me how can i do this both encryption and decryption.

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