C / C++ / MFC Discussion Boards

Re: EN_SELCHANGE Notification handling

David Crow28-Jan-04 2:42

David Crow

28-Jan-04 2:42

Put the following in the dialog's OnInitDialog() method:

m_edit.SetEventMask(m_edit.GetEventMask() | ENM_CHANGE);

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

Re: EN_SELCHANGE Notification handling

Muhammad Ahmed28-Jan-04 3:02

Muhammad Ahmed

28-Jan-04 3:02

thanks alot for solving the problem
i had to change yr code a little like this
m_Editor.SetEventMask(m_Editor.GetEventMask()|ENM_SELCHANGE);

ahmed

Win32 - ActiveX question

Scozturk28-Jan-04 2:00

Scozturk

28-Jan-04 2:00

Hi!
I am trying to integrate the DHTML editing control to a win32 dialog.
For that I manually copy-pasted the code (CONTROL IDC_DHTML ....) from a mfc application resource to my win32 api application resource and I import the dhtmled.ocx. The program doesnt open when I click on it ( it also doesnt give an error message).
Am I doing something wrong?

Well... I am a beginner ...

Re: Win32 - ActiveX question

Mike Dimmick28-Jan-04 2:30

Mike Dimmick

28-Jan-04 2:30

MFC does a lot of work behind the scenes to pretend that you can place an ActiveX control in your resources and have it 'just work'. See the code in DLGCORE.CPP in the MFC source, particularly CDialog::CreateDlgIndirect, for more details.

The Win32 dialog box API knows nothing of ActiveX controls and bombs out because it cannot find a suitable window class for the ActiveX control.

If you want to host ActiveX controls in a raw Win32 application, you need to implement a control site (from memory, you need to at least implement the IOleContainer and IOleControlSite interfaces) and then create the controls yourself.

For anyone who cares, MFC preprocesses the dialog template before passing it to Windows, stripping out (but remembering) any ActiveX control data and any list box initialisations (Win32 doesn't do this either). When Windows sends WM_INITDIALOG to the window, MFC actually calls CDialog::HandleInitDialog, which creates any ActiveX controls, initialises them, and performs any other control initialisations, before calling your override of OnInitDialog. In this way, it presents the illusion that ActiveX controls are controls like any other.

IP Address

AnsGe28-Jan-04 1:36

AnsGe

28-Jan-04 1:36

Hai Friends,

How can i get the IP addrees of the current system.

Plase anyone give me a step by step procedure

Re: IP Address

SJolly28-Jan-04 1:51

SJolly

28-Jan-04 1:51

Hello,

I've done this before using windows sockets.
I don't know if it's the best way, but it definitely works:

char szHostName[400];
struct hostent *hostinfo = NULL;
IN_ADDR addr;
char szIP[16]; // "xxx.xxx.xxx.xxx\0"
ULONG ulIP = 0;

// get the dns name as a string
gethostname(szHostName, 400);

// get the host info (contains ip address)
hostinfo = gethostbyname(szHostName);

if(hostinfo == NULL)
{
DWORD dwError = WSAGetLastError();
// handle the error
}
else
{
// get the ip as ULONG
ulIP = *reinterpret_cast<pulong>(hostinfo->h_addr_list[0]);

// put the ip it into an IN_ADDR
addr.S_un.S_addr = ulIP;

// changes ip into string
sprintf(szIP, "%s", inet_ntoa(addr));

TRACE("My IP address is %s\n", szIP);
}

Regards,
Simon

Re: IP Address

Anonymous29-Jan-04 0:24

Anonymous

29-Jan-04 0:24

Hai,

Thanks for your message. But when i copy the given code lot of errors occured. IN_ADDR undeclared identifier etc.

I have not insatlled Platform SDK. For running the code may i need the Paltform SDK?

regards

Anish

Re: IP Address

SJolly29-Jan-04 0:40

SJolly

29-Jan-04 0:40

Sorry, yes you will definitely need the platform SDK.

Regards,
Simon

CPU Usage

YanivNahum28-Jan-04 1:29

YanivNahum

28-Jan-04 1:29

How can I check the CPU usage (like in the taskmanager)?
Thanks
Yaniv

Re: CPU Usage

David Crow28-Jan-04 2:47

David Crow

28-Jan-04 2:47

Check out the WMI class, Win32_Processor.

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

How we can convert string to number or number to string?

Mehdi_Hosseinpour28-Jan-04 1:03

Mehdi_Hosseinpour

28-Jan-04 1:03

I want to convert a number like (i=3546246547) to a string variable( str='3546246547') and vice versa. How can we do this?

Mehdi Hosseinpour

Re: How we can convert string to number or number to string?

YanivNahum28-Jan-04 1:27

YanivNahum

28-Jan-04 1:27

try the atoi and _itoa or use CString:
CString str;
int i = 3546246547;
str.Format("%d",i);

Re: How we can convert string to number or number to string?

Anonymous28-Jan-04 1:52

Anonymous

28-Jan-04 1:52

CString is MFC specific.

If you're not creating an MFC application and don't want to bloat your code use the following CRT data conversion routines.

strtoul, wcstoul - Converts string to unsigned long integer.

_ultoa, _ultow - Converts unsigned long to string.

For more data conversion functions search MSDN for "Data Conversion Routines"

Re: How we can convert string to number or number to string?

toxcct28-Jan-04 2:18

toxcct

28-Jan-04 2:18

there is also another way to convert values into strings with the sprintf() fonction :

<font style="color:blue;">#include</font> <string.h>
<font style="color:blue;">int</font> sprintf(<font style="color:blue;">char</font>* buffer, <font style="color:blue;">const char</font>* format, ...);
<font style="color:green;">//...</font>

you can use it like printf(), giving it a pointer to where the string will be stored

TOXCCT alias Nicolas C.

How can open files inside program?

Mehdi_Hosseinpour28-Jan-04 0:57

Mehdi_Hosseinpour

28-Jan-04 0:57

I have some wave files that should be play every time. I want to copy them at a folder like 'INCLUDE\' and also i want open some wave files from another place. When i open this wave file program search link 'INCLUDE\' in new folder not inside project?
How can we have inside files and olso open some other files from other folders?

Mehdi Hosseinpour

Re: How can open files inside program?

Cedric Moonen28-Jan-04 1:41

Cedric Moonen

28-Jan-04 1:41

I don't know if I unserstand you correctly...

But if you want to open files that are not in the working directory of your application, you just have to specify complete path ("c:\\My Documents\\Test.wav"). Don't forget to put the character '\' twice because otherwise it is interpreted as a special character.

If you want to access a folder related to your working folder, you can use the "..\\Test.wav" like in dos Wink | ;-)

(this opens a file that is in the root folder of your working directory).

Hope this helps

Re: How can open files inside program?

David Crow28-Jan-04 2:50

David Crow

28-Jan-04 2:50

cedric moonen wrote:
...you can use the "..\\Test.wav" like in dos (this opens a file that is in the root folder of your working directory).

The ".." denote the parent folder of the current, or working directory. The root folder is simply expressed as "\\".

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

Re: How can open files inside program?

Cedric Moonen28-Jan-04 3:02

Cedric Moonen

28-Jan-04 3:02

Hum sorry, my english is not as good as I want Wink | ;-)

!

Yes, of course that's what I wanted to say but I expressed it as root folder of working folder... Smile | :)

Radio Button problem

Shenthil28-Jan-04 0:55

Shenthil

28-Jan-04 0:55

I have created a dialog with 4 sets of radio buttons groups.
for the first 2, its working fine.
but for the rest of the radio buttons group, only one is selecting. When the save and close, its saved. But while displaying, its displaying as only one radio button checked out of all.

Where the problem would be?

Re: Radio Button problem

AnsGe28-Jan-04 1:41

AnsGe

28-Jan-04 1:41

Hai

Your question is not cleared. I think the problem is where the groups u have created. Please confirm that the group check box for the First radio button of every group should be marked.

Regards

Anish

Re: Radio Button problem

Antti Keskinen28-Jan-04 1:51

Antti Keskinen

28-Jan-04 1:51

The radio button grouping uses the tab order for determining the group to which the radio button belongs.

In english, this means that in your dialog resource, the tab order of the radio buttons must run from RADIO_1_GROUP_1 -> RADIO_2_GROUP_1 -> RADIO_1_GROUP_2 -> RADIO_2_GROUP_2 -> etc. in a consecutive order. So, if the first radio button has tab order 3, the next must have 4, the next 5 and so forth.

Now, only the first button of each group should have the group flag set. This flag determines the starting point of the group. Whenever a control with a group flag set is found in the tab order, a new group begins. All radio buttons before this 'flagged radio button' belong to the group specified by the previous 'flagged button'. If no previous group is found before the start of the tabbing order, then those controls remain ungrouped.

Here[^] is a link to MSDN for more information.

-Antti Keskinen

----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.

Re: Radio Button problem

Shenthil28-Jan-04 3:41

Shenthil

28-Jan-04 3:41

Thanks. My Problem is solved

TCHAR Strings and concatonation issues

TomD227-Jan-04 23:53

TomD2

27-Jan-04 23:53

I'm trying to retrieve a few lines of text from a file and then concatonate them into a TCHAR variable.

The entire lines of text amount to around 170 characters in length and the TCHAR receiving each file line is is set to _TCHAR fileLine[4000].

The memory allocation for the overall concatonated string is:

completeString = (_TCHAR*)malloc(4000);

I'm simply using the instruction:

_tcscat(*completeString, fileLine);

to concatonate.

The problem is that the line concatonations stop after around 150 characters for no real reason that I can see (and halfway through a fileLine), even thought the _TCHAR fileLine variable continues to hold the whole of the next string in sequence correctly.

Any ideas?

Thanks for any time,
Tom.

Re: TCHAR Strings and concatonation issues

Diddy28-Jan-04 0:47

Diddy

28-Jan-04 0:47

First off, why are you using malloc as apposed to new? Is this C? (as apposed to C++).

Second - is the text file you are reading ASCII? Or Unicode? _TCHAR = char for ASCII builds or w_char for Unicode ones - it doesn't really help you here as the text file is always going to be one type or the other regardless of your build.

The thing to keep in mind is _tcscat will stop if it finds a \0 somewhere in the string - try executing a _tcslen on the 'fileLine' that is stoping at 150 chars or so, what does that return? If that returns the shorter length, it's possiable the string being read in has embedded \0's that _tcscat is stoping when it finds it.

Re: TCHAR Strings and concatonation issues

TomD228-Jan-04 3:25

TomD2

28-Jan-04 3:25

It's C++, but I'm a novice. Bare with me.

The file is ASCII.

I've been messing around with this and the concat works fine for normal char functions and produces the expected output. I tried to convert this output to _TCHAR (this string is later going to be passed into a DB package (PL/SQL)) and again, it cut off the conversion where the original code stopped concatonating?

Any thoughts?

Cheers,
Tom.

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