C / C++ / MFC

Re: ReadFile() - Buffer...

15-Nov-06 2:02

std::vector !

Prasad
Notifier using ATL | Operator new[],delete[][^]

toxcct15-Nov-06 2:09

toxcct

15-Nov-06 2:09

std::ifstream::getline()

You don't know where to start ? ask a good friend

[VisualCalc 3.0][Flags Beginner's Guide]

Listbox problem

priyank_ldce15-Nov-06 1:35

priyank_ldce

15-Nov-06 1:35

Hi, I want to add ItemData as a string in my list box using win32 APIs. But when I try to get it back from list box I am getting blank string. Can I know what is wrong with my code?
Thanks in advance.

char setStr[20] = "test";<br />
char* getStr;<br />
<br />
::SendMessage(hLbox,LB_SETITEMDATA,listIndex,(LPARAM)setStr);<br />
testStr = (char*):: SendMessage (hLbox, LB_GETITEMDATA, listIndex, NULL);

prasad_som15-Nov-06 1:39

15-Nov-06 1:39

priyank_ldce wrote:
char setStr[20] = "test";

You are passing address of a local variable.
Create it on heap instead.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Viorel.15-Nov-06 1:47

Viorel.

15-Nov-06 1:47

If you always pass constant strings like in your example, then try a different definition of setStr:

const char * setStr = "test";
::SendMessage(hLbox, LB_SETITEMDATA, listIndex, (LPARAM)setStr);

I hope this helps.

priyank_ldce15-Nov-06 2:55

priyank_ldce

15-Nov-06 2:55

Hi, Thanks for the help. Actually I get that string in the form of char[]. Can I know how can I cast it to const char*. I tried strcpy() but it is not working.

I would like to know how to detect the network of the PC is not available?

Viorel.15-Nov-06 3:16

Viorel.

15-Nov-06 3:16

In case of variable string values, I think you can try the following (old-fashioned) solution:

// Setting data
char setStr[20] = ...;
::SendMessage( hLbox, LB_SETITEMDATA, listIndex, (LPARAM)_strdup(setStr));

// Getting data
const char * str = (const char*)::SendMessage( hLbox, LB_GETITEMDATA, listIndex, NULL);

Note that these strings are allocated on the "heap" and therefore must be freed when the list control is destroyed, or new data are set. This can be done in OnDestroy handler of your dialog. You have to loop through list-box’s items and execute:

free((const char*)::SendMessage( hLbox, LB_GETITEMDATA, listIndex, NULL));

Modern solutions use functions other than strdup and free. I am not sure which is simpler.

I hope this helps.

many loop

Max++15-Nov-06 0:40

Max++

15-Nov-06 0:40

from process code below

int i;
m_progress.SetRange(0,999);
m_progress.SetStep(1);
m_progress.SetPos(0);
for (i=0;i<1000;i++)
{
    //Process code
    m_progress.StepIt();
}

During I process in "for loop".
I also want the dialog response my action such as minimize,move dialog etc.
How I write the code if I don't use thread function.

Re: many loop

toxcct15-Nov-06 0:43

toxcct

15-Nov-06 0:43

you MUST move this code into a worker thread if you want the GUI to respond...

You don't know where to start ? ask a good friend

[VisualCalc 3.0][Flags Beginner's Guide]

Re: many loop

Nibu babu thomas15-Nov-06 0:45

Nibu babu thomas

15-Nov-06 0:45

Max++ wrote:
During I process in "for loop".
I also want the dialog response my action such as minimize,move dialog etc.
How I write the code if I don't use thread function.

Hope this[^] article helps.

Nibu thomas
A Developer

Programming tips[^] My site[^]

Re: many loop

Hamid_RT15-Nov-06 7:54

Hamid_RT

15-Nov-06 7:54

where you use this code ?

WhiteSky

LaHaHa15-Nov-06 0:35

LaHaHa

15-Nov-06 0:35

I would like to know how to detect the socket was blocked?
Also how to detect the network is disabled?
Please help!

Re: I would like to know how to detect the network of the PC is not available?

Mark Salsbery15-Nov-06 7:26

Mark Salsbery

15-Nov-06 7:26

LaHaHa wrote:
I would like to know how to detect the socket was blocked?

When a socket is created it is in blocking mode until you change it. WSAAsyncSelct() and
WSAEventSelect() are two APIs that will change the socket to non-blocking mode. You can also
set the blocking mode with something like
// Set socket to non-blocking mode
DWORD dwNonBlockingMode = 1;
::ioctlsocket(hSocket, FIONBIO, &dwNonBlockingMode);

Re: I would like to know how to detect the network of the PC is not available?

LaHaHa15-Nov-06 13:57

LaHaHa

15-Nov-06 13:57

Thank you for your answering!
The blocking may be caused by the firewall, network cable disconnected or etc... So how to detect it? Please help!

Re: I would like to know how to detect the network of the PC is not available?

Mark Salsbery15-Nov-06 14:23

Mark Salsbery

15-Nov-06 14:23

LaHaHa wrote:
The blocking may be caused by the firewall, network cable disconnected or etc...

Check error codes on ALL socket operations.
For example:
If recv() returns 0 the connection has been gracefully closed.
If recv() returns SOCKET_ERROR then call WSAGetLastError() to get an error code:
WSAENETDOWN
WSAENETRESET
WSAECONNABORTED
WSAETIMEDOUT
WSAECONNRESET
etc.

Same with connect()...
connect() will return 0 on success.
If connect() returns SOCKET_ERROR then call WSAGetLastError() to get an error code...

The error returned may vary by protocol and by service provider.
Try it out in the debugger. Put a breakpoint after a connect(), send(), and/or recv() call
and see what error code you get if you unplug the network cable. See what error code you
get when you try to connect() to an address behind a firewall.

The point is the error codes aren't that specific Smile | :)

Re: I would like to know how to detect the network of the PC is not available?

LaHaHa16-Nov-06 21:00

LaHaHa

16-Nov-06 21:00

Thanks a lot! I will try it!

problem with #include

Kiran Pinjala15-Nov-06 0:14

Kiran Pinjala

15-Nov-06 0:14

when i am include <atlbase.h> in my code it is showing errors in the atlbase.h file. like

d:\program files\microsoft visual studio\vc98\atl\include\atlbase.h(5770) : error C2039: 'RegisterClassImplCategories' : is not a member of '_NoAddRefReleaseOnCComPtr<struct ICatRegister>'

i am getting 5 errors as such. How to solve this?

Thank you.

KIRAN PINJARLA

prasad_som15-Nov-06 0:21

15-Nov-06 0:21

kiran.pinjarla wrote:
when i am include in my code it is showing errors

what code ? can you show some code ?
I'm sure you are messing with CComPtr

Prasad
Notifier using ATL | Operator new[],delete[][^]

Kiran Pinjala15-Nov-06 0:47

Kiran Pinjala

15-Nov-06 0:47

I am using CRegKey in my application. And for that i have included the
<altbase.h> file. when i am compiling it, it shows errors in the header file atlbase.h. i am not using the CComPtr.

KIRAN PINJARLA

prasad_som15-Nov-06 1:03

15-Nov-06 1:03

is comdef.h defined in your app. Try including atlbase before it.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Kiran Pinjala15-Nov-06 1:58

Kiran Pinjala

15-Nov-06 1:58

prasad_som wrote:
is comdef.h defined in your app

no.

KIRAN PINJARLA

CWnd - message the first time the window is shown

Hamid_RT15-Nov-06 7:53

Hamid_RT

15-Nov-06 7:53

Where you declare this file atlbase.h?

WhiteSky

benjymous15-Nov-06 0:01

benjymous

15-Nov-06 0:01

I've got a CWnd based class, that displays an image, which I want to be centred on the screen when the window is first shown.

The problem is that I can't find a suitable point to do this - the window needs to have been created, since GetClientRect() doesn't return a useful value until the window is fully created and displayed.

OnShowWindow() is called *before* the window is shown. Is there anything that gets called *afterwards*?

Currently I'm having to do my logic in OnSize, checking that it's the first time GetClientRect returns something other than (0,0,0,0), but that seems incredibly hacky to me Frown | :(

--
Help me! I'm turning into a grapefruit!
Buzzwords!

Re: CWnd - message the first time the window is shown

prasad_som15-Nov-06 1:52