Re: Power Management - C / C++ / MFC Discussion Boards

Re: How`to erase white line I have drawn?

Hamid_RT23-Apr-06 18:55

23-Apr-06 18:55

if you derived CButton and use WM_DRAWITEM you can declare this case
for constant focus or select and else focus for buttons.

How`to get message i have posted?

chybin21-Apr-06 16:32

chybin

21-Apr-06 16:32

I want to get thread I have post.

-- modified at 22:44 Friday 21st April, 2006

Re: How`to get message i have posted?

Aqueel21-Apr-06 17:47

Aqueel

21-Apr-06 17:47

go to following link
http://codeproject.com/script/profile/whos_who.asp[^]

type your name in filter by name and select order by "message count". and click Refresh
Now click on Messages posted
Click on your desired message.

Good luck.

We Believe in Excellence
www.aqueelmirza.cjb.net

What is a top-level/popup/overlapped window?

XXKKFF21-Apr-06 15:32

XXKKFF

21-Apr-06 15:32

what characteristics do they have?

Thanks

XKF

I want nude windows! (no titlebar, no border, nothing)

chasetoys21-Apr-06 13:31

chasetoys

21-Apr-06 13:31

Hey all

I was playing with the CreateWindowEx function, and for the life of me, I can't figure out how to create a completely nude window... meaning nothing is showing but the body of the window (no titlebar, no border, no nothing!)... I was wondering if anyone knew how to do this.

Secondly, I'd like to know how you can do this once you've already called CreateWindowEx, and then after the fact, you want to strip it nude Poke tongue | ;-P

Re: I want nude windows! (no titlebar, no border, nothing)

XXKKFF21-Apr-06 15:17

XXKKFF

21-Apr-06 15:17

A window without the WM_BORDER OR WM_CAPTION should be a nude window,I suppose

You can use SetWindowLong to modify the styles of a window anytime after you create the window

I am the first one to answer this question.In China,this is called sofa.What is it called in English?

XKF

Power Management

Slohnda21-Apr-06 10:21

Slohnda

21-Apr-06 10:21

I'm writing a small utility to set a few default power management values. Although I have most of it completed I am having some issues understanding and working with this particular function.

BOOLEAN EnumPwrSchemes(
PWRSCHEMESENUMPROC lpfnPwrSchemesEnumProc,
LPARAM lParam
);

I'm a newbie if you will when it comes to coding yet I do understand the basics. I'm having difficulty understanding how to handle this function since it uses a CALLBACK function.

typedef BOOLEAN (CALLBACK* PWRSCHEMESENUMPROC)(
UINT uiIndex, // power scheme index
DWORD dwName, // size of the sName string, in bytes
LPWSTR sName, // name of the power scheme
DWORD dwDesc, // size of the sDesc string, in bytes
LPWSTR sDesc, // description string
PPOWER_POLICY pp, // receives the power policy
LPARAM lParam // user-defined value
);

I'm not quite sure how to handle the callback function and what I need to pass to the EnumPwrSchemes function.

Any help would be greatly appreciated.

TIA.

Re: Power Management

David Crow21-Apr-06 10:54

David Crow

21-Apr-06 10:54

Does this help?

BOOLEAN CALLBACK PwrSchemesEnumProc(
   UINT uiIndex, // power scheme index
   DWORD dwName, // size of the sName string, in bytes
   LPWSTR sName, // name of the power scheme
   DWORD dwDesc, // size of the sDesc string, in bytes
   LPWSTR sDesc, // description string
   PPOWER_POLICY pp, // receives the power policy
   LPARAM lParam // user-defined value )
{
}
...
EnumPwrSchemes(PwrSchemesEnumProc, 0);

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

"We will be known forever by the tracks we leave." - Native American Proverb

'delete' operator

Ali Tavakol21-Apr-06 7:42

Ali Tavakol

21-Apr-06 7:42

Hi all,
when we allocate memory:

char *s;
s = new char[10];

and at last delete it:
delete s;

how system determines number of memory bytes allocated for s, to unallocate them?

Re: 'delete' operator

Maxwell Chen21-Apr-06 7:50

Maxwell Chen

21-Apr-06 7:50

You have to write this way:

delete [] s;

So the Standard Library (of C++) knows how many to dellocate.

Maxwell Chen

Re: 'delete' operator

David Crow21-Apr-06 9:12

David Crow

21-Apr-06 9:12

Ali Tavakol wrote:
how system determines number of memory bytes allocated for s, to unallocate them?

That information is written a few bytes in front of the address actually returned by the new operator.

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

"We will be known forever by the tracks we leave." - Native American Proverb

Problem with CSocket Listen function

jpyp21-Apr-06 7:28

jpyp

21-Apr-06 7:28

I am calling the Listen function as follows:
Listen(1);
but I can still Accept more than one connections. I know for sure that the first connection is still alive when I accept the second one or any other ones after.
Without having to post all my code, do you have any idea of what I may be doing wrong?

Thanks!
jpyp

Re: Problem with CSocket Listen function

basementman21-Apr-06 8:35

basementman

21-Apr-06 8:35

The 1 param is the number of un-accepted connections that can be queued. So, you may have many connections open, regardless of your listen queue size.

The listen queue stores the pending connections until you "accept" them. So, in a busy environment, you need to have a fair sized queue so that you do not refuse clients because you cannot accept connections fast enough.

onwards and upwards...

Re: Problem with CSocket Listen function

jpyp21-Apr-06 9:39

jpyp

21-Apr-06 9:39

Thanks! That explains a lot!

Thanks!
jpyp

How to use Spy++?

XXKKFF21-Apr-06 6:46

XXKKFF

21-Apr-06 6:46

:Hi,I'm a beginner in VC
How to use Spy++?
What kind of functionality does it have and how to use them?

Thanks Smile | :)

XKF

Re: How to use Spy++?

Eric Dahlvang21-Apr-06 6:52

Eric Dahlvang

21-Apr-06 6:52

Start by: Running Spy++, then hit the F1 key on your keyboard.

Using Spy++

Spy++ (SPYXX.EXE) is a Win32-based utility that gives you a graphical view of the system’s processes, threads, windows, and window messages. With Spy++, you can:

Display a graphical tree of relationships among system objects, including processes, threads, and windows.

Search for specified windows, threads, processes, or messages.

View the properties of selected windows, threads, processes, or messages.

Select a window, thread, process, or message directly from the view.

Use the Finder Tool to select a window by mouse positioning.

Set message options using complex message log selection parameters.

Tip While using Spy++, in many instances you can click the right mouse button to display a pop-up menu of frequently used commands. The commands available depend on where the pointer is. For example, if you click while pointing at an entry in the window view and the selected window is visible, the pop-up Highlight menu item will cause the border of the selected window to flash so that the window can be easily located on the screen.

----------
There go my people. I must find out where they are going so I can lead them.
- Alexander Ledru-Rollin

Verify a message signed from javacard by smartcard in Visual C++

Malacitano21-Apr-06 6:34

Malacitano

21-Apr-06 6:34

I have a smartcard Cyberflex Access e-gate and I have developed for it an applet that receives an encrypted text (encrypted by a visual c++ application, using CryptoAPI), decrypts the text and returns the decrypted text signed. The problem is that I don’t get visual c++ application verifies signed text.

On card I have the following code:

byte apduBuffer[] = apdu.getBuffer(); 		
short byteRead = (short)(apdu.setIncomingAndReceive());

// First, we decrypt msg --------------------------------------    
cipherRSA = Cipher.getInstance(Cipher.ALG_RSA_PKCS1, false);
cipherRSA.init(privateKey, Cipher.MODE_DECRYPT);
cipherRSA.doFinal(apduBuffer,(short)APDUDATA, byteRead, apduBuffer, (short)0);
  
// Second, we sign only the first byte of decrypted msg ------------------------------
cipherRSA.init(privateKey, Cipher.MODE_ENCRYPT);
 
short outbytes; 	    
outbytes = cipherRSA.doFinal(apduBuffer,(short)APDUDATA, (short) 1, apduBuffer, (short)0);
    	
// Finally, we send results ------------------------------------
apdu.setOutgoing(); 
// indicate the number of bytes in the data field
apdu.setOutgoingLength((short)outbytes); 
// at offset 0 send 128 byte of data in the buffer
apdu.sendBytes((short) 0, (short) outbytes);

On visual c++ application I have the following code:

pbContent = (BYTE*) "Security is our business..."; // The message
cbContent = strlen((char *)pbContent)+1; // Size of message
cbEncryptedBlob = cbContent;


if(!CryptAcquireContext(
		&hProv, // Address for handle to be returned.
		NULL, // Use the current user's logon name.
		MS_DEF_PROV,
		PROV_RSA_FULL, // Need to both encrypt and sign.
		NULL)) {
	MessageBox("CryptAcquireContext failed.", "Error", MB_OK);
}


	
if (!CryptImportKey (hProv, rsaKeyBlob, sizeof(rsaKeyBlob), 0,0, &hMiKey)) 
{
	MessageBox("Public key import failed.", "Error", MB_OK);
	exit(1); // Kaboooommmmmmm!
}

CryptEncrypt(hMiKey, 0, TRUE, 0, NULL, &cbEncryptedBlob, cbContent); // we ask size

	
if(pbEncryptedBlob = (BYTE*)malloc(cbEncryptedBlob))
{
	MessageBox("Memory has been allocated for the encrypted BLOB.", "Info", MB_OK);
	memset(pbEncryptedBlob, '\0', cbEncryptedBlob);
	memcpy(pbEncryptedBlob, pbContent, cbContent); 
}
else
{
	MessageBox("Memory allocation error while encrypting.", "ERROR", MB_OK);
}

if(!CryptEncrypt(hMiKey, NULL, TRUE, NULL, pbEncryptedBlob, &cbContent, cbEncryptedBlob)) {
	MessageBox("CryptEncrypt failed.", "Error", MB_OK);
} else {
	char* EncryptedString = new char[(cbEncryptedBlob * 2) +1];
	ByteToStr(cbEncryptedBlob, pbEncryptedBlob, EncryptedString);
	wsprintf(informacion,"The size of encrypted message is %d bytes.\n%s",cbEncryptedBlob,EncryptedString);
	MessageBox(informacion, "Info", MB_OK);
}

Now I send pbEncryptedBlob (reversed because of little-big endian issue) to the card and I receive a BYTE[128]. That array is what I try to verify with the public key visual c++ application has read from card at the beginning.

if(!CryptDecrypt(hMyKey, NULL, TRUE, NULL, message, &lengthMsg)) {

	LPVOID lpMsgBuf;
	DWORD dw = GetLastError(); 

	FormatMessage(
		FORMAT_MESSAGE_ALLOCATE_BUFFER | 
		FORMAT_MESSAGE_FROM_SYSTEM,
		NULL,
		dw,
		MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
		(LPTSTR) &lpMsgBuf,
		0, NULL );

	wsprintf(informacion, "failed with error %d: %s", dw, lpMsgBuf); 
	MessageBox(informacion, "Error", MB_OK);

	LocalFree(lpMsgBuf);
}

I get “Bad key” error here.
hMyKey comes from importing this byte array:

BYTE rsaKeyBlob[] = {
	// BLOBHEADER
		0x06,		// PUBLICKEYBLOB
		0x02,		// CUR_BLOB_VERSION
		0x00,0x00,	// reserved
		0x00,0xa4,0x00,0x00, // CALG_RSA_KEYX
	// RSAPUBKEY
		0x52,0x53,0x41,0x31, // "RSA1" (public key)
		0x00,0x04,0x00,0x00, // bitlen = 1024
		0x01,0x00,0x01,0x00, // pubExp = 65537
	// inverted modulus
		0x95,0x04,0x59,0xEC,0x00,0x2D,0x45,0x93,
		0x4F,0x78,0x9A,0x3C,0x3F,0x60,0xDD,0xC4,
		0xE9,0x8D,0x0E,0xFE,0xEA,0x61,0xC7,0x77,
		0x8E,0x60,0x42,0x00,0xFA,0xE8,0x58,0xDD,
		0x44,0x2F,0xFF,0x88,0x7A,0xB1,0xED,0xB9,
		0x1A,0xDC,0x02,0x88,0x83,0xDD,0x8A,0xB4,
		0x23,0xEA,0x5D,0x3F,0x0E,0x16,0x8C,0x0B,
		0xFE,0x5C,0xD6,0x49,0x7D,0xEE,0xBF,0xDF,
		0x52,0xCF,0x0A,0x66,0x09,0xCF,0x44,0xA0,
		0xB5,0x26,0x8B,0x84,0xFA,0x3E,0xFE,0x37,
		0x8D,0x85,0xCE,0x30,0xCC,0xD9,0xC1,0x29,
		0x86,0x77,0x96,0x11,0xA4,0xF7,0xE0,0xD2,
		0x6E,0x1B,0xA9,0xE5,0x66,0xC0,0x5E,0xC7,
		0x5E,0x5E,0x50,0x0C,0xB1,0xB5,0xAC,0x4C,
		0x3A,0x8D,0x11,0x25,0x23,0xBC,0x2A,0x19,
		0x22,0x77,0x0B,0xCF,0x47,0xFF,0x9B,0xAC
   };

Can I decrypt a message encrypted with the private key using public key in visual c++?

Do I have to use any special function to do it or I can do it like I do it in java (if I encrypt with private key, everyone can decrypt with associate public key)?

Change the backgroound color for a CListCtrl control

masnu21-Apr-06 6:16

masnu

21-Apr-06 6:16

I can easily change the background color for a CListCtrl control by calling:

MyList.SetBkColor(::GetSysColor(COLOR_BTNFACE));

This, however, does not change the background for the individual item entries in the list. Writing the code to make the list transparent is too long for what I am trying to accomplish.

Any suggestions? Thanks.

Re: Change the backgroound color for a CListCtrl control

Naveen21-Apr-06 21:15

Naveen

21-Apr-06 21:15

u can map NM_CUSTOMDRAW message ....

it simple to change the back ground color from here

void ListCtrlEx::OnCustomDraw( NMHDR* pNMHDR_i, LRESULT* pResult_o )
{
NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<nmlvcustomdraw*>(pNMHDR_i);
NMCUSTOMDRAW &nMcd = pLVCD->nmcd;
*pResult_o = CDRF_DODEFAULT;
switch( nMcd.dwDrawStage )
{

case CDDS_PREPAINT:
// Item prepaint notifications,
*pResult_o = CDRF_NOTIFYITEMDRAW;
break;
case CDDS_ITEMPREPAINT:
pLVCD->clrTextBk = BK_COLOR;// the background color u want
*pResult_o = CDRF_DODEFAULT ;
break;
}
}

let me know if u have any problem with this...

nave

CComboBox - DropList Style- Horizontal Scrollbar?

jayart21-Apr-06 6:08

jayart

21-Apr-06 6:08

The strings I display in the CCombobox might be longer than the specified combobox width.
I need to enable horizontal scroll bar for above purpose.
Please suggest me how to do that.
Thanks a ton

Re: CComboBox - DropList Style- Horizontal Scrollbar?

David Crow21-Apr-06 6:21

David Crow

21-Apr-06 6:21

ArtiGujare wrote:
Please suggest me how to do that.

Use the SetHorizontalExtent() method.

"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

[Message Deleted]

sherton21-Apr-06 4:38

sherton

21-Apr-06 4:38

[Message Deleted]

Re: System () in vc++ 6.0

toxcct21-Apr-06 4:52

toxcct

21-Apr-06 4:52

i don't understand what you want to do...

you want to use system(), or you have to ?! Confused | :confused:

Re: System () in vc++ 6.0

sherton22-Apr-06 0:39

sherton

22-Apr-06 0:39

for invoking dos com. or like run in start in win.
pl help me Smile | :)

Thanks,
Anji.Manchikanti

Re: System () in vc++ 6.0

super_ttd22-Apr-06 6:24

super_ttd

22-Apr-06 6:24

you didn't answer his question I think.
what i understood is that he asked if you were obliged/told to use system (to invoke dos commands), or you ask about how using it (or how doing such dos cmd calls).

as DavidCrow said, system() is not a safe function to use, and as much as possible, avoid using it. prefer calling the ShellExecute() Win32 API instead.

-- TTD --

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