C / C++ / MFC Discussion Boards

Re: Getting ip from mac address

valikac22-Jan-04 4:35

valikac

22-Jan-04 4:35

One solution is GetIpNetTable().

Kuphryn

Re: Getting ip from mac address

itmpras22-Jan-04 5:13

itmpras

22-Jan-04 5:13

Hello Kuphryn !! thanks for ur hint.... but by using the GetIpNetTable() function we r able to get the ip address present in our host computer arp entry but i want a function like gethostbyname() which gives ip address of specified system name present in the LAN, bcos in my application i am capturing the mac address i don't know how to get the ip address from that .. the arp entry contain a very few entries only .. if u find any solution please do reply Smile | :)

alphablend with win98 does not work!

schaereran@gmx.net22-Jan-04 2:10

schaereran@gmx.net

22-Jan-04 2:10

it compiles, runs, but makes nothing transparent. my code runs well on WinXP and Win 2000.
in the MSDN is written, that it should also work with win98!
does anybody has a clue? or an implementation of a alphablend funtion?

the code i use is:

//blalba
BLENDFUNCTION blend;
blend.BlendOp = AC_SRC_OVER;
blend.AlphaFormat = 0;
blend.SourceConstantAlpha = 110;//(wichtigster parameter (zw. 0 - 255))
blend.BlendFlags = 0;
AlphaBlend(dcMemBackground, 0, 0, nWidth, nHeight, dcMemForeground, 0, 0, nWidth, nHeight, blend);

thanx, greets

Re: alphablend with win98 does not work!

Prakash Nadar22-Jan-04 3:40

Prakash Nadar

22-Jan-04 3:40

I belive lot of other apis like this one is OS dependened.

Tech.Support : Mam, is your pc running under windows?
Customer : No actually its close to the main door.

MFC - incrementing values

Ashman22-Jan-04 1:08

Ashman

22-Jan-04 1:08

I am having a difficult time trying to get a value to increment. What I mean is if I have a static control for example called CValue that each time a button is pressed it will increase the value by one. So if CValue = 10 and the button is pressed, I want it to change the value of CValue to 11. Each time I try to do this, the compiler says some crap about converting CString to an int is impossible or something. I cannot remember because I just got out of bed to write this so that I may have a reply by the morning.

Can someone please help me. I know this is easy 'i think' but it has me tickled pink.

Thankyou
Ashman
Confused | :confused:

Re: MFC - incrementing values

David Crow22-Jan-04 2:52

David Crow

22-Jan-04 2:52

Have you tried something like:

CString strValue;
CValue.GetWindowText(strValue);
int nValue = atoi(strValue) + 1;
CValue.SetWindowText(strValue);

A rich person is not the one who has the most, but the one that needs the least.

Re: MFC - incrementing values

John R. Shaw22-Jan-04 7:00

John R. Shaw

22-Jan-04 7:00

DavidCrow wrote:

CString strValue;
CValue.GetWindowText(strValue);
int nValue = atoi(strValue) + 1;
CValue.SetWindowText(strValue);

Whoops!

CString strValue;
CValue.GetWindowText(strValue);
int nValue = atoi(strValue) + 1;
strValue.Format(_T("%d"), nValue);
CValue.SetWindowText(strValue);

INTP

Re: MFC - incrementing values

David Crow22-Jan-04 7:03

David Crow

22-Jan-04 7:03

No, BIG whoops! Thanks.

A rich person is not the one who has the most, but the one that needs the least.

Re: MFC - incrementing values

basementman22-Jan-04 11:58

basementman

22-Jan-04 11:58

What about GetDlgItemInt()?

SetDlgItemInt(IDC_MYCONTROL,MyCtrl.GetDlgItemInt(IDC_MYCONTROL) + 1);

onwards and upwards...

Inline Assembly

hph22-Jan-04 0:58

hph

22-Jan-04 0:58

hello together,

i have a strange problem with the following asm command;

__asm call 0h

This command should jump to the next instruction and put the value of the position where the last call was made onto the stack! Well, it should, but i only get this message:

error C2415: improper operand type

Any ideas?

Thanks in advance!

Re: Inline Assembly

David Crow22-Jan-04 2:53

David Crow

22-Jan-04 2:53

How about:

__asm
{
    call 0h
}

A rich person is not the one who has the most, but the one that needs the least.

Re: Inline Assembly

hph22-Jan-04 3:23

hph

22-Jan-04 3:23

that's just the same!

Re: Inline Assembly

David Crow22-Jan-04 3:45

David Crow

22-Jan-04 3:45

Indeed. It used to be that you had to do it that way (whether that was with Borland's compiler or Microsoft's compiler, I forget), but I've not done inline assembly in nearly a decade.

Are you sure that is a valid statement (for an Intel platform)?

A rich person is not the one who has the most, but the one that needs the least.

How to tell if a file is open by someone else

GeraldoLuiz22-Jan-04 0:51

GeraldoLuiz

22-Jan-04 0:51

I have a program that manages documents on a central area in the network and I need to tell if a file is in use by someone ele, when I try to open it. The program runs on each machine that access the central archive (no program runs on the server that holds the files). What is the right or the best way to do it ? Can I try to lock the file or rename it and see by the error returned if the file is open ? Is there any API function that tells me that ? If it´s a Word Doc, for instance, the Word gives me a hint, but Notepad doesn´t. I want to send my own msg to the user, despite of the app used to open the file. Is it possible ?

Re: How to tell if a file is open by someone else

фил22-Jan-04 2:35

фил

22-Jan-04 2:35

check out sdk's CreateFile() proc. if specified file is somehow locked, you get an invalid handle. you may then call GetLastError():

hope this helps...

Re: How to tell if a file is open by someone else

basementman22-Jan-04 12:02

basementman

22-Jan-04 12:02

or you could look at good old _sopen, passing the _SH_DENYRW flag

onwards and upwards...

copy exe file to remote system

skpanda22-Jan-04 0:43

skpanda

22-Jan-04 0:43

hello,
i want to install my application (.exe) in a remote m/c. how to first copy the exe file to the remote m/c... .i know that a service is required to install & start in the remote m/c . now i want to install that remotely . how do i achieve that.???? please tell me how to install the application remotely ...i need it urgent.

please send code , article... urls...

Re: copy exe file to remote system

David Crow22-Jan-04 2:56

David Crow

22-Jan-04 2:56

skpanda wrote:
how to first copy the exe file to the remote m/c

How about CopyFile(), MoveFile(), or SHFileOperation()?

For the rest, it sounds like you'll need RPC.

A rich person is not the one who has the most, but the one that needs the least.

Bug in C++ ????

GDavy21-Jan-04 23:39

GDavy

21-Jan-04 23:39

Hello guys,

I think there is a bug in C++.
I had a very strange bug in my app but I fixed it..
What happened was somewhere in my code I wrote:

CString sTemp;
...//doStuff
sTemp = ((A_INTEGER == myObj.GetIntValue())? GetString("1"):GetString("2"));

...do more stuff

What happened now was that I used that sTemp string to put text in a list-control...
when I used the statement shown above and R1C2(Row1Column2) was filled with GetString("2") and R2C2 was filled with GetString("1") then in R1C5 the leftmost character was deduced by 1... When also R3C2 was filled with GetString("2") then R1C5 was deduced by 2 and so on...
in the other way no bug appeared....

The ONLY change I made in the code was that I replaced the line:`
sTemp = ((A_INTEGER == myObj.GetIntValue())? GetString("1"):GetString("2"));
with:
if(A_INTEGER == myObj.GetIntValue())
sTemp = GetString("1");
else
sTemp = GetString("2");
Which is still basically the same thing just in a different notation...
Does anyone know why this bug appeared?????

Any comments are welcome....

Greetings,
A puzzled programmer....

Re: Bug in C++ ????

фил22-Jan-04 2:42

фил

22-Jan-04 2:42

first of all c ain't software, so it cannot contain any bugs.
this maybe sth caused by your compiler.

have you checked out this:
sTemp = GetString((A_INTEGER == myObj.GetIntValue())? "1" : "2");

??

Networking on Windows 9x/ME

YanezDeGomeyra21-Jan-04 23:01

YanezDeGomeyra

21-Jan-04 23:01

Hi,

I need to write an application that is able to access the network as soon as networking is available. On NT class systems that's not a problem, I can just have a service and the network is available as soon as the machine boots up, be it an http address or a UNC path.

On 9x the problem is a bit trickier. I can still have an application that behaves like a service and that's run as soon as the computer boots up, but I am not able to access UNC paths until the user has loggend on into the network.

So the question is: is there a way to detect when the user logs on to the network (be it a callback, a message broadcasted, and event, whatever)? I could possibly hook on the logon window and intercept the clicking of 'OK', but that only starts the logging on and I don't know how long that takes.

Any ideas?

Thanks,
Alberto

Re: Networking on Windows 9x/ME

Mukkie25-Jan-04 8:16

Mukkie

25-Jan-04 8:16

Hello!

Try to catch message WM_DEVICECHANGE with DBT_DEVTYP_NET

Hope that it will help.

how to make CButton with bgcolor and a icon

angu selvam21-Jan-04 22:53

angu selvam

21-Jan-04 22:53

hai everybody,
I am doing a project in VC++.
for that i have came accross a trouble.
How to draw a CButton with a backcolor and
a icon on that button.

Re: how to make CButton with bgcolor and a icon

wb22-Jan-04 0:04

22-Jan-04 0:04

try

http://www.codeproject.com/buttonctrl/
Smile | :)

FindFirstChangeNotification

Rob Caldecott21-Jan-04 22:32

Rob Caldecott

21-Jan-04 22:32

Interesting issue when using FindFirstChangeNotification and FILE_NOTIFY_CHANGE_FILE_NAME.

I have two threads. Every so often thread A creates a temp file and then uses the MoveFile API command to move the file to a specific folder. Thread B is watching said folder via FindFirstChangeNotification/FILE_NOTIFY_CHANGE_FILE_NAME. When the file appears in the folder, thread B wakes up and processes the file. However, on some PCs, thread B fails to open the file - GetLastError returns 32 - "File in use by another process". I can only imagine that thread B is getting FILE_NOTIFY_CHANGE_FILE_NAME mid-way through the MoveFile. Not sure what to do about this - keep trying to open the file until it succeeds? Tacky. Note I am only getting one FILE_NOTIFY_CHANGE_FILE_NAME notification - so I can't ignore it if the file open fails in the hope I will get another one later.

Stumped. I guess, as this is one app, thread A can call a therad-safe function in thread B and add the file to a list protected by a critical section or something, but this is a fair amount of re-engineering.

Anyone else come across issues like this with FindFirstChangeNotification?

The Rob Blog

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