C / C++ / MFC

Re: Retrieving data members from memory

23-Apr-08 22:03

You're welcome.
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.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

Saurabh.Garg23-Apr-08 5:22

Saurabh.Garg

23-Apr-08 5:22

Using write function in stream classes you can only serialize classes having POD (Plain Old Data). If there are pointers in the class then this will not work. What I do is in each class which I want to serialize I write Read and Write functions which will do the serialization. If there is only POD then those function can use stream write function else I serialize each variable separately.

class Foo
{
    void Read(std::istream& in);
    void Write(std::ostream& out);
}

Then you can write serialization functions as

void Deserialize(std::iostream& stream, CMyClass& obj)
{
    obj.Read(stream);
}

-Saurabh

Re: Retrieving data members from memory

manustone23-Apr-08 21:50

manustone

23-Apr-08 21:50

Hi Saurabh
Many many thanks for suggestion!
Bye Manustone

Writing text to somewhere else than the screen

Anthony Appleyard23-Apr-08 4:06

Anthony Appleyard

23-Apr-08 4:06

If I have an HBITMAP, is it possible to use TextOut() or etc to write text to that bitmap?

Re: Writing text to somewhere else than the screen

led mike23-Apr-08 4:24

led mike

23-Apr-08 4:24

Yes

led mike

Re: Writing text to somewhere else than the screen

Mark Salsbery23-Apr-08 9:26

Mark Salsbery

23-Apr-08 9:26

Create a memory DC
Select the bitmap into it (saving the previously selected bitmap)
Render your text on the DC
Select the saved bitmap back into the DC (this un-selects your bitmap from the DC)
Destroy the DC

The only catch here is, if the HBITMAP is not a DIBSection, then the DC will need to be
compatible with the bitmap or selecting the bitmap into the DC can fail.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Writing text to somewhere else than the screen

Hamid_RT24-Apr-08 5:59

Hamid_RT

24-Apr-08 5:59

Yes its possible you need to a handle to DC(Createompatibledc) and for other steps see Mark's answer.

GetShortPathNameW issue with UNC path (more than 255 chars)

vikramlinux23-Apr-08 3:48

Re: GetShortPathNameW issue with UNC path (more than 255 chars)

23-Apr-08 3:48

Hi all,
I am trying to convert a long file path ( more than 255 chars, in UNC format) using GetShortPathNameW API. But It fails, saying that

"The filename, directory name, or volume label syntax is incorrect."

Anybody knows what is issue here?

CPallini23-Apr-08 3:59

Re: GetShortPathNameW issue with UNC path (more than 255 chars) [modified]

23-Apr-08 3:59

Probably the filename or the directory name or the volume label syntax is incorrect, I suppose. Laugh | :laugh:

BTW have you read the following note (from MSDN [^]):

In the ANSI version of this function, the name is limited to MAX_PATH characters. To extend this limit to 32,767 wide characters, call the Unicode version of the function and prepend "\\?\" to the path. For more information, see Naming a File.

Smile | :)

vikramlinux23-Apr-08 4:14

Re: GetShortPathNameW issue with UNC path (more than 255 chars)

23-Apr-08 4:14

I have used GetShortPathNameW (unicode version ) only
sample path is as follows:
"\\?\UNC\server_ip\ONTAP_ADMIN$\vol\vol0\home\testdir4\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\"

modified on Wednesday, April 23, 2008 10:25 AM

CPallini23-Apr-08 4:27

Re: GetShortPathNameW issue with UNC path (more than 255 chars)

23-Apr-08 4:27

Well, I get error 3 (the system cannot find the path specified), that is quite different. How do you call the function?
Smile | :)

vikramlinux23-Apr-08 23:52

Re: GetShortPathNameW issue with UNC path (more than 255 chars)

23-Apr-08 23:52

Here is the sample code

<br />
DWORD dw =0;<br />
wstring m_UNCPath = L"Long file name";  // more then 255 chars<br />
<br />
long length = GetShortPathNameW(m_UNCPath.c_str(), NULL, 0);<br />
DWORD dwerror = GetLastError();<br />
<br />
// dwerror return "123" and length =0<br />
<br />
length += 2;<br />
wchar_t* buffer = new wchar_t[length];<br />
<br />
dwerror= GetShortPathNameW(m_UNCPath.c_str(), buffer, length); <br />

vikramlinux24-Apr-08 0:25

Re: GetShortPathNameW issue with UNC path (more than 255 chars)

24-Apr-08 0:25

Some updates here are
If the path is given like
"\\?\c:\..."
things works

but for path
"\\?\UNC\c:\..."

things fails.

Most important I want to get shortpath name over network
so my path becomes

"\\?\UNC\ip_address\..."
Here things fails badly.

CPallini24-Apr-08 0:26

Re: GetShortPathNameW issue with UNC path (more than 255 chars)

24-Apr-08 0:26

My test:

void main()
{
  WCHAR szShort[MAX_PATH];
  DWORD dw =0;
  wstring m_UNCPath = L"C:\\Documents and Settings\\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234.txt"; // more then 255 chars

  long length = GetShortPathNameW(m_UNCPath.c_str(), szShort, MAX_PATH);
}

resulting value of szShort:

"C:\DOCUME~1\012345~1.TXT"

vikramlinux24-Apr-08 0:29

Re: GetShortPathNameW issue with UNC path (more than 255 chars)

24-Apr-08 0:29

Please recheck your path. I guess it's less then 255 chars.

CPallini24-Apr-08 0:44

Re: GetShortPathNameW issue with UNC path (more than 255 chars)

24-Apr-08 0:44

Damn, you're right, Windows truncated the name...
Smile | :)

vikramlinux24-Apr-08 0:46

open ssl based window c,c++ application

24-Apr-08 0:46

See you can not create a long file path simply in windows explorer.It is not supported. You need to call apis like CreateDirectoryEx and CreateFileW to create such path and write a file inside it.

SSL decryption

Dr. Kelwin23-Apr-08 3:41

Dr. Kelwin

23-Apr-08 3:41

Hi! I have some transport which based on winsock. Client(FTPS) send to me some data over SSL, and i receive it with (for example):

<br />
...<br />
if (WSARecv(AcceptSocket, &DataBuf, 1, &RecvBytes, &Flags, &AcceptOverlapped, NULL) == SOCKET_ERROR){<br />
     if (WSAGetLastError() != WSA_IO_PENDING)<br />
          printf("Error occured at WSARecv()\n");<br />
}<br />
...<br />

how can i decrypt received data in DataBuf, if i have certificate, puclic and private keys?

Re: SSL decryption

led mike23-Apr-08 8:29

led mike

23-Apr-08 8:29

Dr. Kelwin wrote:
if i have certificate, puclic and private keys?

Well that's not how SSL works so I don't know if this will help

http://msdn2.microsoft.com/en-us/library/ms867086.aspx[^]

http://msdn2.microsoft.com/en-us/library/ms867086.aspx[^]

led mike

amit_pansuria23-Apr-08 3:28

amit_pansuria

23-Apr-08 3:28

helo,

I want to write socket client application by using c or c++ in window without using any Winsock or MFC class.
how do i achieve it.
I search it but not getting exactly .

Regards,
Amit

CPallini23-Apr-08 3:42

23-Apr-08 3:42

Are you kidding?
AFAIK even Cygwin uses Winsock library.
Smile | :)

Nemanja Trifunovic23-Apr-08 3:56

Nemanja Trifunovic

23-Apr-08 3:56

There are many network libraries out there. For instance, take a look at Boost Asio[^]

Programming Blog

utf8-cpp

Maximilien23-Apr-08 4:17

Maximilien

23-Apr-08 4:17

Don't you have to write your own communication interface between the TCP/IP stack and your software ? or something like that ?

Maximilien Lincourt
Your Head A Splode - Strong Bad

led mike23-Apr-08 8:32

led mike

23-Apr-08 8:32

amit_pansuria wrote:
I want to write socket client application by using c or c++ in window without using any Winsock

Winsock2 was modeled after the Berkley Sockets API and then extended to add Windows specific and other features. So if you "want" to use it to write Berkley Socket code you can get very close. I can't tell from your post if that is what you "want".

http://en.wikipedia.org/wiki/Winsock[^]

http://blogs.msdn.com/wndp/archive/2006/02/24/538746.aspx[^]

http://www.sockets.com/winsock2.htm[^]

led mike