C / C++ / MFC Discussion Boards

Henrik_O23-Jan-03 3:29

23-Jan-03 3:29

Hello
I'm thinking of using a Excel cheet to present som statistics in my appliation. Is the best way to use a html view for this or ???

Another question that really is not a c++ issue but perhaps some clever person has the awnser. Smile | :)

Can I retrive information from a Cell and use this in a query towards my db if yes. What is the best approach in this matter.
Regards
Henrik

Obtaining local IP address

georgiek5023-Jan-03 2:55

georgiek50

23-Jan-03 2:55

I have a program which is using Winsock and I would like to put the local IP Address on the title bar of the dialog. Unfortunately all I get for an IP address is 0 and in dotted quad 0.0.0.0

here is some of my code:

<br />
Sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);<br />
...<br />
<br />
sa.sin_family = AF_INET;<br />
sa.sin_addr.S_un.S_addr = INADDR_ANY;<br />
sa.sin_port = htons(2000);<br />
<br />
// Bind Socket<br />
iError = bind(Sock, (LPSOCKADDR) &sa, sizeof(struct sockaddr));<br />
<br />
SetWindowText(hDlg, inet_ntoa(sa.sin_addr));<br />

I noticed in MSDN that by using getsockname that the IP address might not be available always especially if I/O has not occured. But I thought that when I bind the socket that the sockaddr_in structure gets filled in and that one of the variables should contain the address which it is connected with. What am I missing here?

Re: Obtaining local IP address

Joaquín M López Muñoz23-Jan-03 3:19

Joaquín M López Muñoz

23-Jan-03 3:19

Warren Young provides a sample[^] as part of his excellent Winsock Programmer's FAQ.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Disable PrintScreen-Button

Olaf Rodewald23-Jan-03 2:49

Olaf Rodewald

23-Jan-03 2:49

I have to develop an application in which hardcopies via keystroke are disabled. The keystrokes I know are: ALT+Print, CTRL+Print, SHIFT+Print and Print alone. How can I disable these keys in VC++ ?

Thanks ...

Olaf Rodewald

Re: Disable PrintScreen-Button

HENDRIK R23-Jan-03 2:49

HENDRIK R

23-Jan-03 2:49

I'd recommend using a hook. Install it by use of SetWindowHookEx of type WH_KEYBOARD and react on your requested keys inside the provided hook function.

Re: Disable PrintScreen-Button

Olaf Rodewald23-Jan-03 3:03

Olaf Rodewald

23-Jan-03 3:03

Do you have a reference for SetWindowHookEx or better an example ? Confused | :confused:

Thanks, Olaf Rodewald

Re: Disable PrintScreen-Button

HENDRIK R23-Jan-03 3:35

HENDRIK R

23-Jan-03 3:35

In case you need a system wide hook, you need to implement the hook function inside a DLL. The function could look sth. like this:

    __declspec(dllexport) LRESULT CALLBACK HookFunction(<br />
                       int code,<br />
                       WPARAM wParam,<br />
                       LPARAM lParam)<br />
      {<br />
         char szVCode[50];<br />
<br />
         //get virtual key code and display it<br />
         sprintf(szVCode, "Virtual Key code: %lx", wParam);<br />
         MessageBox(NULL, szVCode,"Key stroke", MB_OK);<br />
      }

Installing it in your application is done by calling SetWindowsHookEx:

hHookDll = LoadLibrary("hook");<br />
      hHookProc = (HOOKPROC) GetProcAddress(hHookDll, "HookFunction");<br />
<br />
      hSystemHook =  SetWindowsHookEx(WH_KEYBOARD,hHookProc,hHookDll,0);

Finally, don't forget to unload DLL and unset the hook:

UnhookWindowsHookEx(hSystemHook);<br />
      FreeLibrary(hHookDll);

If you need some more detailed information, have a look at MSDN - there's lots of stuff about that topic.

Re: Disable PrintScreen-Button

joshfl23-Jan-03 3:42

joshfl

23-Jan-03 3:42

you have to put your system wide keyboard hook in a .dll

http://www.codeguru.com/system/KBHook.html

that has a good example of a system wide keyboard hook , and an application example that uses the dll.

i was able to build my own keyboard hook after going thru that , and ive used it w/ no major problems. note there is a bug in the code there. u need to get rid of hook = NULL; line from dllmain;

hope this helps Smile | :)

todo....
:: insert inpirational text here ::

Re: Disable PrintScreen-Button

Olaf Rodewald23-Jan-03 5:11

Olaf Rodewald

23-Jan-03 5:11

I'll try it ... Thank you ... Roll eyes | :rolleyes:

Olaf

Shared array?

Dominik Reichl23-Jan-03 2:20

Dominik Reichl

23-Jan-03 2:20

Hello,

I have a problem: I have two separate applications:
1) an ATL explorer shell extension
2) a MFC application which should display the files

Because of project reasons the files have to be different, the
explorer shell extension must be a DLL and the display application
must be a MFC project as EXE.

How can I pass the selected files from the DLL to the EXE?
I first thought of GlobalAlloc but MSDN says that this function
is only provided for 16-bit support.

What would you suggest? Is there a way to share an array? It is a bit difficult to implement an IPC system in this case...

Thanks
-Dominik

Re: Shared array?

Joaquín M López Muñoz23-Jan-03 3:02

Joaquín M López Muñoz

23-Jan-03 3:02

I'd say GlobalAlloc is just fine. IMHO the docs are a little misleading with respect to the applicability of this function (the proposed alternative, HeapAlloc and company, doesn't add much to this for your particular needs).

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

A question about the precompiler directive __PTHREADS__

George223-Jan-03 2:02

George2

23-Jan-03 2:02

Hi, everyone!

Where is the the precompiler directive __PTHREADS__ defined?
Defined in compiler? What is the meaning and function of
the precompiler directive __PTHREADS__?

Thanks in advance,
George

Re: A question about the precompiler directive __PTHREADS__

Anonymous23-Jan-03 2:19

Anonymous

23-Jan-03 2:19

pthreads is a unix threading library, and I can only imagine the application you are trying to compile makes use of the Win32 version of this. __PTHREADS__ will be found wherever the pthread include files are, thats about all that can be said.

Re: A question about the precompiler directive __PTHREADS__

George223-Jan-03 2:21

George2

23-Jan-03 2:21

Thanks!

I have another, does Windows use pthreads library?
If I am using Windows version of the project, can
I passby the codes has something to do with pthreads?

Cheers,
Geroge

Re: A question about the precompiler directive __PTHREADS__

Stefan Pedersen23-Jan-03 4:14

Stefan Pedersen

23-Jan-03 4:14

Nitpicking: Pthreads is a POSIX standard (IEEE POSIX 1003.1c-1995, also known as the ISO/IEC 9945-1:1996) not a "unix" one.

"You can stand all night at a redlight anywhere in town, hailing Marys left and right but none of them slow down. I've seen the best of men go past. I don't wanna be the last..."

Re: A question about the precompiler directive __PTHREADS__

Anonymous23-Jan-03 9:50

Anonymous

23-Jan-03 9:50

Yep, there is a version of the UNIX pthreads available for Win32 at http://sources.redhat.com/pthreads-win32/ You should be able to compile and run just about any application that uses pthreads, although if it uses other unix system calls you might run into problems.

Re: A question about the precompiler directive __PTHREADS__

George223-Jan-03 16:05

George2

23-Jan-03 16:05

Thanks,

George

Re: A question about the precompiler directive __PTHREADS__

George223-Jan-03 16:06

George2

23-Jan-03 16:06

Thanks!

George

About pop3

SatyaDY23-Jan-03 1:57

SatyaDY

23-Jan-03 1:57

Hi friends,
Are there any POP3 supporting MFC classes ?? I want to get copy of mail when the mail lands at the Server. Please suggests any links if available.
Thanks
Satya Rose | [Rose]

Re: About pop3

xxhimanshu23-Jan-03 2:03

xxhimanshu

23-Jan-03 2:03

there are many..search in www.codeproject.com/internet you will find many..

cheers

Himanshu

dynamic precision with double?

ihugo23-Jan-03 1:08

ihugo

23-Jan-03 1:08

I try to write double values to a file. The problem is that all values have different precisions.
Example:
double d = 1.234
CString.Format("%.5f", d) causes the output to be 1.23400.
I only want to print 1.234

How can I determine the precision of a given double value?

Re: dynamic precision with double?

Rage23-Jan-03 1:24

Rage

23-Jan-03 1:24

What about CString.Format("%ls",d); ?

~RaGE();

Re: dynamic precision with double?

ihugo23-Jan-03 1:47

ihugo

23-Jan-03 1:47

Thanks, Rage, but that doen't work. The Prefic "l" before the type specifier has no effect on the precision. I suppose you meant "%ld" !?

Heiko

Re: dynamic precision with double?

Rage23-Jan-03 3:23

Rage

23-Jan-03 3:23

Sorry, i mistake myself with ascanf specifiers. Right code is

str.Format("%g",d);

. This gives out 1.234 for double d=1.2340000 or d=1.234.

~RaGE();

Changing Font in Property Pages

MarcoNedwig23-Jan-03 1:02

MarcoNedwig

23-Jan-03 1:02

I've a problem with Property Pages within a Property Sheet.
The Font Property is set to a 10 point Font in the Resource Editor, but the Property Pages still appear in a 8 Point(I think this is default) Font.

Changing the font via SetFond function of the PropertySheet or PropertyPages doesn't change anything.
GetTabControl()->SetFont(&App.m_CLabelBoldFont) only changes the Font of the Labels in the Tab Control.

Does anybody know a solution?
I already thought of looping throug the Elements of the Property Page in the OnInitDialog function, but I don't know how. Even such a solution would be helpful to me. Thanks.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.