C / C++ / MFC

toxcct6-Sep-05 4:57

toxcct

6-Sep-05 4:57

englobe parameters with ""

xcopy ".\MyPatchJ\bin\MyApp.exe"  "c:\Program Files\"

TOXCCT >>> GEII power
[toxcct][VisualCalc]

LCI6-Sep-05 5:04

LCI

6-Sep-05 5:04

ok.. thanks.. i'll try that?

toxcct6-Sep-05 5:06

toxcct

6-Sep-05 5:06

of course, why wouldn't you ? are you suspecting something ? Sigh | :sigh:

of course, don't if you don't want to copy into program files...
i just gave you the tip to work on dos with spaced parameters...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

-- modified at 11:07 Tuesday 6th September, 2005

David Crow6-Sep-05 6:08

memory leak - a basic misunderstanding

6-Sep-05 6:08

You can use quotes as has already been suggested, use the 8.3 format of that folder without quotes, or use CopyFile() instead.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

IlanTal6-Sep-05 3:39

IlanTal

6-Sep-05 3:39

Could someone clear up a possible memory leak for me? In using ADO.NET in MFC Projects it is written:

#pragma push_macro("new")
#undef new

try
{
m_OleDbConnection = new OleDbConnection(
S"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\test.mdb"
);
m_OleDbConnection->Open(); // Open up the connection
m_OleDb = new OleDbCommand(S"select * from Persons", m_OleDbConnection);
m_Reader = m_OleDb->ExecuteReader();

int count = 0;

while (m_Reader->Read())
{
AddToList(count,m_Reader->get_Item("First Name")->ToString(),
m_Reader->get_Item("Last Name")->ToString(),
m_Reader->get_Item("Phone Number")->ToString()
);
count++;
}
}
catch(Exception *e)
{
AfxMessageBox(CString(e->ToString()));
}
__finally
{
m_Reader->Close();
m_OleDbConnection->Close();
}

#pragma pop_macro("new")

What is bothering me is there is a new with no delete. The most surprising one is m_OleDb which doesn’t even have a close, let alone a delete. I tried adding a close as well as a delete and neither was accepted by the compiler.

I open and close the database hundreds of times, so I wanted to consider leaving it open and then I started to think about the memory leak problem.

Can anyone give me a hint why a memory leak doesn’t seem to play here?

Thanks,
Ilan

David Crow6-Sep-05 3:48

6-Sep-05 3:48

Would it make sense to add the following below the call to ExecuteReader():

delete m_OleDb;

since m_OleDb is not used any more?

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

IlanTal6-Sep-05 3:55

IlanTal

6-Sep-05 3:55

It made so much sense that I already tried it.
The compiler refuses with the error message:

c:\Ilan\ctview\ReadStudy.cpp(1755): error C3841: illegal delete expression: managed type 'System::Data::SqlClient::SqlCommand' does not have a destructor defined

Therefore I wanted to see if anyone had any other ideas.

Thanks,
Ilan

Tim Smith6-Sep-05 3:58

Tim Smith

6-Sep-05 3:58

It is a managed data type. Those can't be deleted. The error message gives all the information you need.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/vcerrCompilerErrorC3841.asp[^]

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

-- modified at 9:58 Tuesday 6th September, 2005

David Crow6-Sep-05 4:02

get local machine ethernet address

6-Sep-05 4:02

My bad.

I've not used .Net so my new/delete suggestion was apparently way off base.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

rolati6-Sep-05 3:05

rolati

6-Sep-05 3:05

is there a way in C++ to get the ethernet address of a local machine running any of the MAC OS?

Rola

Re: get local machine ethernet address

David Crow6-Sep-05 3:59

Re: get local machine ethernet address

6-Sep-05 3:59

Technically, no. C++ knows nothing of IP addresses or the like. The API to obtain that type of information will likely be platform specific. For Windows, the information can be obtained with gethostname() followed by gethostbyname(), neither of which are C++.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Steve Mayfield6-Sep-05 19:59

Steve Mayfield

6-Sep-05 19:59

Both gethostname() and gethostbyname() are part of the Berkley Sockets package which is the basis for most TCP/IP sockets implementations - so any OS that supports a Berkley Sockets implementation should have these calls.

Steve

AES Implementation in C++ Decrypt Problem

mustangnet6-Sep-05 3:02

mustangnet

6-Sep-05 3:02

Hi,

I am trying to create AES encryption and decryption separately. For that I have created two programs one does the encryption and one does the decryption. After the encryption, encrypted value is stored inside the database, later it is retrieved and passed as a parameeter to the decryption program.

The problem is that encrption works perfectly, but decryption is not.

here is the corresponding code snippets

ENCRYPTION
*****************************************************************************
pRequest->Write( "Hello from CFX_AES1!" ) ;
LPCSTR lpszVariable = pRequest->GetAttribute("outvar");
LPCSTR lpszEStr = pRequest->GetAttribute("eString");
LPCSTR lpszKey = pRequest->GetAttribute("key");
try
{
CRijndael oRijndael;
oRijndael.MakeKey(lpszKey, CRijndael::sm_chain0, 16, 16);
char szDataIn1[8000];
strcpy(szDataIn1,lpszEStr);

char szDataIn[8000];
char szDataOut[8000];
memset(szDataIn, 0, 8000);
memset(szDataOut, 0, 8000);

// Test ECB
strcpy(szDataIn, szDataIn1);
memset(szDataOut, 0, 8000);
oRijndael.Encrypt(szDataIn, szDataOut, 8000, CRijndael::ECB);
pRequest->SetVariable(lpszVariable,szDataOut);

}
****************************************************************************
DECRYPTION
****************************************************************************
LPCSTR lpszVariable = pRequest->GetAttribute("outvar1") ;
LPCSTR lpszEStr = pRequest->GetAttribute( "dString" );
LPCSTR lpszKey = pRequest->GetAttribute("key");
try
{
CRijndael oRijndael;

char szDataIn[8000];
char szDataOut[8000];
oRijndael.MakeKey(lpszKey, CRijndael::sm_chain0, 16, 16);
strcpy(szDataIn,lpszEStr);
//Test ECB
memset(szDataOut, 0, 8000);
oRijndael.Decrypt(szDataIn,szDataOut,8000, CRijndael::ECB );
pRequest->SetVariable( lpszVariable,szDataOut );

}
****************************************************************************

Thanks in advance,
mustangnet

antialiasing with MFC

T1TAN6-Sep-05 2:57

T1TAN

6-Sep-05 2:57

Is there a way to use AA with MFC? I've created a skin system for my little app, and now I've added support for irregulary shaped skins, but they don't render quite as nice, I think AA would do the trick.. I don't want to link to DirectX or anything like that, my app needs to stay as small as possible..

Any ideas, thoughts..? Confused | :confused:

---
http://sprdsoft.cmar-net.org - We Sprd You Softly
Our site features contents and several images. All of this is very weird.

In the end, war is not about who's right, it's about who's left.

Neagoe Gabriel6-Sep-05 3:01

Neagoe Gabriel

6-Sep-05 3:01

look over the internet for graphics gems books in pdf format and u have there everithing you need...

NG

T1TAN6-Sep-05 3:08

T1TAN

6-Sep-05 3:08

Do you mean graphics gems for graphics editing or programming? D'Oh! | :doh:

I'm talking about rendering the image on the screen and beautifying the edges, where transparency begins Unsure | :~

---
http://sprdsoft.cmar-net.org - We Sprd You Softly
Our site features contents and several images. All of this is very weird.

In the end, war is not about who's right, it's about who's left.

Neagoe Gabriel6-Sep-05 3:54

Neagoe Gabriel

6-Sep-05 3:54

for programming.... Smile | :)

T1TAN6-Sep-05 4:26

T1TAN

6-Sep-05 4:26

I'm poking google's eye right now, but all I get is GPU gems, photoshop gems etc.. Sigh | :sigh:

Perhaps you know a good starting link? Cool | :cool:

---
http://sprdsoft.cmar-net.org - We Sprd You Softly
Our site features contents and several images. All of this is very weird.

In the end, war is not about who's right, it's about who's left.