C / C++ / MFC Discussion Boards

Christian Graus15-Dec-02 10:54

15-Dec-02 10:54

Are you an Extreme fan, or did you come up with 'Politacalamity' independently of their brilliant 'three sides to every story' album ?

Christian

P.S. Although I love helping people through the CP message boards, the amount of abuse I have copped in recent times forces me to adopt a policy where I will only answer questions put to me through the boards. It is also to your benefit to ask on the site, I don't know half of everything, and a publically posted question will get you more than one person trying to help. I would especially prefer to live in a world where no-one ever sends me a zipped project with instructions on wh

Re: Politicalamity

Kevnar15-Dec-02 15:48

Kevnar

15-Dec-02 15:48

Check out my review[^] on Amazon.com

It's about the third review down...

"My brother says 'Hello'... So hurray for speech therapy!" -Emo Phillips

Re: Politicalamity

Christian Graus15-Dec-02 15:54

Christian Graus

15-Dec-02 15:54

Cool review. I hated the fourth album actually, but Pornografitti and II sides... are classics IMO.

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Hwo to handle "tab" to visually deisgnate have focus?

Stan the man15-Dec-02 5:49

Stan the man

15-Dec-02 5:49

Hi,

I have an onwer drawn button. I have noticed that when I tab, I do not see that it has "focus." What do I have to handle ( message wise) and besides drawing the dotted focus rectangle in the Drawitem to make the button show that it has focus when I tab through the different windows?

Thanks.

Re: Hwo to handle "tab" to visually deisgnate have focus?

Michael Dunn15-Dec-02 6:29

Michael Dunn

15-Dec-02 6:29

A control needs to have the WS_TABSTOP style for it to be included in the tab order.

--Mike--
If it doesn't move and it should: WD-40. If it moves and it shouldn't: duct tape.

1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Retrieve the file names from a dir?

Rickard Andersson²⁰15-Dec-02 3:47

Rickard Andersson²⁰

15-Dec-02 3:47

Aarrgh!!
How can I get the file names from a dir?

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: Retrieve the file names from a dir?

C^hris L^osinger15-Dec-02 3:54

C^hris L^osinger

15-Dec-02 3:54

there are many articles on CodeProject that demonstrate this (look in the Files and Folders section, and, here's mine). or, if you want to do it yourself, you can use FindFirstFile or _findfirst.

-c

There's one easy way to prove the effectiveness of 'letting the market decide' when it comes to environmental protection. It's spelt 'S-U-V'.
--Holgate, from Plastic

Smaller Animals Software

Re: Retrieve the file names from a dir?

Rickard Andersson²⁰15-Dec-02 4:16

Rickard Andersson²⁰

15-Dec-02 4:16

But if I want to get the file names from only "C:\Pictures\MyNewPic" only... how can I specify a dir so all these findfile functions only searches one dir?

I can't explain better I think! Smile | :)

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: Retrieve the file names from a dir?

Jörgen Sigvardsson15-Dec-02 4:27

Jörgen Sigvardsson

15-Dec-02 4:27

Read the MSDN docs on FindFirstFile or _findfirst.

--
Only in a world this sh*tty could you even try to say these were innocent people and keep a straight face.

Re: Retrieve the file names from a dir?

Ted Ferenc15-Dec-02 4:30

Ted Ferenc

15-Dec-02 4:30

I assume you want this? sometimes I find I need to attach to the directory and not use a path.

hFind = FindFirstFile("C:\\Pictures\\MyNewPic\\*.*", &FindData);

bOK = (hFind != INVALID_HANDLE_VALUE);
while(bOK)
{
bOK = FindNextFile(hFind, &m_FindData)
}

Typo

Ted Ferenc15-Dec-02 4:32

Ted Ferenc

15-Dec-02 4:32

bOK = FindNextFile(hFind, &FindData)

I MUSt learn to type, and too proof read!

Re: Retrieve the file names from a dir?

Rickard Andersson²⁰15-Dec-02 6:15

Rickard Andersson²⁰

15-Dec-02 6:15

Ted Ferenc wrote:
FindFirstFile("C:\\Pictures\\MyNewPic\\*.*", &FindData);

Ooh!
So I can just do that, okay... I didn't understand it when I read in MSDN Library.

Thank you!

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Proxy Scanner

Trin214-Dec-02 22:20

Trin2

14-Dec-02 22:20

I want to make a proxy scaner, but I don't know how to open a socket.
I want to make connection to some computer and try to make a TCP/IP connection to a definite port. If I can connect to try whether It is a proxy server.

But I do not know how to make this in MFC.

Can someone help me?

Trin2

Re: Proxy Scanner

l a u r e n15-Dec-02 3:34

l a u r e n

15-Dec-02 3:34

ummmmm i would suggest u do some reading about tcp/ip and the various protocols b4 taking on this level of project if u dont understand how to open a socket

try www.w3c.org and look up some rfcxxx docs

"traffic lights are for people who can't make their own decisions"
biz stuff about me

Re: Proxy Scanner

Taka Muraoka15-Dec-02 4:04

Taka Muraoka

15-Dec-02 4:04

lauren wrote:
try www.w3c.org and look up some rfcxxx docs

Now that's the nicest way I've seen somebody tell somebody else to sod off in a while Laugh | :laugh:

he he he. I like it in the kitchen! - Marc Clifton (on taking the heat when being flamed)

Awasu v0.4a[^]: A free RSS reader with support for Code Project.

CFile Question

John Clump14-Dec-02 20:09

John Clump

14-Dec-02 20:09

Hi everyone. I have a question about the use of CFile. I have the code below, and the filename is that of a file which I have tested and determined exists, and is not shared. The file is an HTML file, and I want to take the contents of the HTML file (the text), and put it into a CString. The string will then be parsed and the hyperlinks extracted.

<br />
CFile cFile;<br />
CString strFileContents;<br />
<br />
cFile.Open(m_strFileName, CFile::modeRead | CFile::shareExclusive);<br />
cFile.Read(&strFileContents, cFile.GetLength());<br />
cFile.Close();<br />

The problem with the code above is that when the Read is performed, the program crashes. I tried using an old style C string in place of a CString, the data is read but a bunch of garbage chars are at the end of the string, and the program crashes when I hit Close(). Anyone know what I am doing wrong? I really want the file contents in a CString, because the necessary memory is allocated dynamically, and the CString Find functions are great for parsing.

Re: CFile Question

Trin214-Dec-02 22:13

Trin2

14-Dec-02 22:13

First of all, you can't put the whole file in a single CString object.
You may try to read the file line by line.
You do not use the Read function correctly, first parameter is the block you read, the second is the size of that block. Usualy used for reading a binnary file.

Good Luck!

Trin2

Re: CFile Question

Dudi Avramov14-Dec-02 23:16

Dudi Avramov

14-Dec-02 23:16

CSting doesn't allocated anything till you initialize it.
Since you didn't allocated, you got crash.
Change your code to the following:

cFile.Read(strFileContents.GetBuffer(SIZE), cFile.GetLength());

After finishing working with the string call
strFileContents.ReleaseBuffer();

CSimpleArray ?

ZBUILDER14-Dec-02 19:35

ZBUILDER

14-Dec-02 19:35

Excuse me.
Today,I study the WTL Library's CSimpleArray class source code,I find the following code:

<code>template<class T>
class CSimpleArray
{
      T* m_aT;
      ...

	class Wrapper
	{
	public:
		Wrapper(T& _t) : t(_t)
		{
		}
		template <class _Ty>
		void *operator new(size_t, _Ty* p)
		{
			return p;
		}
		T t;
	};
	void SetAtIndex(int nIndex, T& t)
	{

		new(&m_aT[nIndex]) Wrapper(t);
	}
   ...
}</code>

I can not understand the syntax about "new(&m_aT[nIndex]) Wrapper(t)" Confused | :confused:

,anyone can explain it? thanks first.

SIMPLE IS BEAUTY

Re: CSimpleArray ?

Renjith Ramachandran14-Dec-02 20:13

Renjith Ramachandran

14-Dec-02 20:13

ZBUILDER wrote:
I can not understand the syntax about

ZBUILDER wrote:
new(&m_aT[nIndex]) Wrapper(t);

returns the pointer and that new allocates using that pointer

* * * Code the dreams * * *

Re: CSimpleArray ?

ZBUILDER14-Dec-02 20:18

ZBUILDER

14-Dec-02 20:18

Then What about Wapper(t)?
And How does it modify the Adderss of &m_aT[nIndex]?

SIMPLE IS BEAUTY

Re: CSimpleArray ?

Jörgen Sigvardsson15-Dec-02 4:28

Jörgen Sigvardsson

15-Dec-02 4:28

It's called placement new. You're executing the Wrapper-constructor on an already allocated memory block.

--
Only in a world this sh*tty could you even try to say these were innocent people and keep a straight face.

Re: CSimpleArray ?

Jörgen Sigvardsson15-Dec-02 4:29

Jörgen Sigvardsson

15-Dec-02 4:29

ZBUILDER wrote:
new(&m_aT[nIndex]) Wrapper(t)

It's called placement new. It executed the constructor Wrapper(t) on a preallocated memory block &m_aT[nIndex]. So basically, you're telling new not to allocate new memory for the object but use existing memory.

--
Only in a world this sh*tty could you even try to say these were innocent people and keep a straight face.

Help with context menu programming.

trustno114-Dec-02 15:43

trustno1

14-Dec-02 15:43

hi everyone,

i added a context menu to my sdi project, based on treeview, but the context menu doesn't work correctly. the problem with my context menu is that whenever i right single click on a treenode, the context menu doesn't popup, which the context menu supposes to popup. the context menu only pops up when i double right click on a node.. i'm running winxp and using visual studio.net.. any suggestion is welcome.. thx in advance.

this is the code i added to my message map:

ON_WM_CONTEXTMENU()

this are the codes that i used for my context menu:

void CLeftView::OnContextMenu(CWnd *pWnd, CPoint point)
{
CMenu menu;
menu.LoadMenu(IDR_MENU1);
menu.GetSubMenu(0)
->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON,
point.x, point.y, this);
}

Template class question...

Matt Gullett14-Dec-02 14:56

Matt Gullett

14-Dec-02 14:56

NOTE: This is a fairly long post.

I have not implemented my own template class before though I have used STL and MFC template classes extensively. I have a situation that I believe can be best dealt with by writing a template class.

Here's the deal:

I have 10-20 console apps which generate data files of various formats from a specified input data source of a known type. For the most part the source data defines the structure of the output based on its configuration. The simplest way to implement these is to just iterate the input records and then in an inner loop examine the data's configuration and produce the correct output.

What I would like to do is to create a template class from which I can construct an "execution plan". The template class would provide an interface for 1) examining the data source and making decisions on the output structure, 2) iterating the data source recordset, 3) following the steps that were decided in #1 for each record.

The way I see it being implemented is something like this (pseudocode):

class BaseExecutionStep
{
}

class ExecutionStep_OutputNumber
{
short sLength;
bool bLeadingZeroes;
short sDecimalPlaces;
}

class ExecutionStep_OutputDate
{
string strFormat;
date dtNullDate;
bool bHideNullDates;
}

class ExecutionStep_OutputText
{
short sLength;
bool bRemoveUndesiredChars;
short sAlign; (left, right, center)
}

class ExecutionStepFactory
{
ExecutionStep* CreateStep(SomeSourceObject);
}

template class ExecutionPlan<ExecutionStepFactory, DataSource, Filter>
{
BuildPlan(); // build a list, array, set of ExecutionSteps using the ExecutionStepFactory
DescribePlan(); // for auto-documentation
ExecutePlan(); //
}

What I would ideally want is to be able to use this same execution plan template class to make the development of these "iterative" proccesses a little more standardized. Ideally I could create any new ExecutionStepFactory and any new DataSource object and be able to use the template to deal with the nasty little details of actually doing this work.

Is this a reasonable use of templates? Is there a better way than what I have descrived here?

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