C / C++ / MFC Discussion Boards

Antony M Kancidrowski29-Mar-04 2:44

29-Mar-04 2:44

It seems that either you have run out of memory, or the GDI+ isn't supported on the platform you are running on!

Supported platforms (from MSDN)
Windows 98/Me, Windows XP, Windows 2000, Windows NT 4.0 SP6

Ant.

Re: Pen command returns null pointer ?

Gem30-Mar-04 1:46

Gem

30-Mar-04 1:46

Either options seem to be not possible, I can not understand this kind wierd behaviours of Visual C++ !

Is this code to create and initialize 2d vector correct?

Ming Yan28-Mar-04 20:57

Ming Yan

28-Mar-04 20:57

Hi...

Can somebody pls tell me what these codes do?

==============================================
int size = 5;

vector<int> ** abc; //Create 2d vector???!!!

abc = new vector[int] * [size];
abc[0] = new vector<int> [size * size]

for (int i=1; i<size; i++)
{
abc[i] = abc[0] + i * size;
}

for (int i=0; i<size; i++)
{
for (int j= 0; j<size; j++)
{
abc[i][j].pushback(0);
}
}
================================================

And in the end...how big is the abc array and what is d size of abc[0][0]? Is the code correct in creating a 2d array of 5x5 matrix? D'Oh! | :doh:

Pls suggest anythg...I'd appreciate it very much...

Thank you...

Re: Is this code to create and initialize 2d vector correct?

jhwurmbach28-Mar-04 21:42

jhwurmbach

28-Mar-04 21:42

You want a two-dimensional array of ints?

You can declare it as vector < vector < int> > abc;

You can subsequently access the elements as abc[i] [j],
with i running from 0 to size(abc)-1 and j running from 0 to size(abc[i])-1.
As a general rule, just remember that abc is one dimension, and the oter dimensions are abc[0], abc[1] and so on. They are independent from each other, epecially can they have a varying lenght.

"We trained hard, but it seemed that every time we were beginning to form up into teams we would be reorganised. I was to learn later in life that we tend to meet any new situation by reorganising: and a wonderful method it can be for creating the illusion of progress, while producing confusion, inefficiency and demoralisation."

-- Caius Petronius, Roman Consul, 66 A.D.

Re: Is this code to create and initialize 2d vector correct?

Robert A. T. Káldy29-Mar-04 23:03

Robert A. T. Káldy

29-Mar-04 23:03

Use boost::multi_array. It provides a lot of procedures to manage multidimensional arrays and it's safer than vector of vectors, vector with size*size length etd.
See Boost home page.

Robert-Antonio

"CRAY is the only computer, which runs an endless loop in just 4 hours"

editing unicode char ?

Manikandan28-Mar-04 20:07

Manikandan

28-Mar-04 20:07

Anybody know how to type unicode characters like arabic, chinese, korean etc directly into an edit box.

I am using windows XP with unicode languages support. I want to paste the unicode text i copied from character map to an edit conrol. But the edit control show junk.
Roll eyes | :rolleyes:

Re: editing unicode char ?

RChin28-Mar-04 22:15

RChin

28-Mar-04 22:15

You should be able to enable your OS IME (Input Method Editor) from the regional settings in the control panel. This allows you to input foreign characters by providing the appropriate input interface for the given language.

I Dream of Absolute Zero

Re: editing unicode char ?

Manikandan28-Mar-04 22:22

Manikandan

28-Mar-04 22:22

yes... i have done it already...

but if i copy/paste those arabic or chinese text to a windows standard edit control it only shows junks ("?_?") not the real text...

Mad | :mad:

Re: editing unicode char ?

RChin28-Mar-04 22:39

RChin

28-Mar-04 22:39

Manikandan wrote:
only shows junks ("?_?") not the real text...

Ok.
Then I think the problem is making sure you are using a font that can correctly display the appropriate unicode characters.
For example: Courier will not show asian character types (you will just see either a bunch of square blocks, or question marks). However if you display the same using Tahoma, and you have the language packs installed, it should show up correctly.
Not all fonts cater for unicode characters, you may have to experiment to see which ones do.

I Dream of Absolute Zero

Pointer or not pointer

Jonathan Pouliot28-Mar-04 19:59

Jonathan Pouliot

28-Mar-04 19:59

Hi,

since i was programming in VC++ 2 years ago, i tried some other languages like Delphi,C#,and a lot of web programming so i lost my C++ knowledge a little (maybe to much Frown | :(

)

anyway, one of the most important question i need to know is : Where/how do u know if u have to use pointer instead of simple class declaration ? ex:

when do i need to choose between : CFile pFile; or CFile* pFile;

Thanks
Jonathan

Re: Pointer or not pointer

22491728-Mar-04 20:23

224917

28-Mar-04 20:23

one obvious reason is when you want to allocate ur object in heap you have to use pointer Smile | :)

greatest thing is to do wot others think you cant
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Re: Pointer or not pointer

Prakash Nadar28-Mar-04 21:07

Prakash Nadar

28-Mar-04 21:07

or you want to allocate some resource dynamically.

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Tip of the day of visual C++ IDE.
"We use it before you do! Visual C++ was developed using Visual C++"

Re: Pointer or not pointer

Anonymous29-Mar-04 4:52

Anonymous

29-Mar-04 4:52

so if i'm understanding :

EX :

CRect rect;
GetWindowRect(&rect);

this will be use to associate the rect variable.
////////////////////////////////////////////////////

CRect* rect = new CRect(0,0,100,100);

Thanks

Threads

SatyaDY28-Mar-04 19:38

SatyaDY

28-Mar-04 19:38

Hi,
I read in some book, that every modal dialog based application, creates two message loops, one for caller and other for dialog box itself. Is this correct?? If so, how it is implemented?? How many threads (UI or worker) theads does the SDI & MDI application have??

Thanks and Regards,
Satya

Re: Threads

Prakash Nadar28-Mar-04 21:10

Prakash Nadar

28-Mar-04 21:10

From my knowledge and the books that i have read, there is always one message loop / thread.

by default there is one thread/sdi or mdi or dialog so only one message loop.

worker initially does not have a message loop. Message loop is created dynamically by windows only when that thread needs one.

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Tip of the day of visual C++ IDE.
"We use it before you do! Visual C++ was developed using Visual C++"

Re: Threads

SiddharthAtw28-Mar-04 22:57

SiddharthAtw

28-Mar-04 22:57

Yes that absoutely correct Mr.Prakash. U don't have to go long way. Just read Threading in Jeffery Richter book. It has all in it.
cheers!
siddharth

Re: Threads

Prakash Nadar28-Mar-04 23:06

Prakash Nadar

28-Mar-04 23:06

Yeah i have that book Smile | :)

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Tip of the day of visual C++ IDE.
"We use it before you do! Visual C++ was developed using Visual C++"

Re: Threads

Tim Smith29-Mar-04 4:14

Tim Smith

29-Mar-04 4:14

What you said is true for message queues, not message loops. You can have many message loops. Each thread can only have one message queue.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: Threads

Prakash Nadar29-Mar-04 5:44

Prakash Nadar

29-Mar-04 5:44

yeah, in my application also there is one main message loop and few other make shift message loop.

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Tip of the day of visual C++ IDE.
"We use it before you do! Visual C++ was developed using Visual C++"

Re: Threads

Tim Smith29-Mar-04 4:13

Tim Smith

29-Mar-04 4:13

You can have as many message loops in your thread as you wish. I commonly have three or four. Another question is how many message queues can a thread have. The answer to that is only one.

When you display a dialog (using standard Windows), it uses it's own internal message loop to process the message while your main application has the primary message loop used for normal processing.

Often, when an application needs to process messages during an operation that will take a lot of time, another message loop is used to pump the messages from the message queue.

So as you can see, you can have many message loops. But you usually only worry about the primary message loop.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: Threads

SatyaDY29-Mar-04 17:20

SatyaDY

29-Mar-04 17:20

When you display a dialog (using standard Windows), it uses it's own internal message loop to process the message while your main application has the primary message loop used for normal processing.

Hi Tim,
Is this the case with both Modal and Modeless Dialog Boxes ?? How it is actually implemented?? What are the classes involved in doing this?? How we can create multiple message loops and link them with the application.

Regards
Satya

Creating shortcuts

Vini Deep28-Mar-04 19:00

Vini Deep

28-Mar-04 19:00

Hi,

I want to copy the shortcut of an executable to a different location, from my program. Is there any function to do that? I have used CopyFile() to copy the exe, but how to create the shortcut to the exe and send/paste it to a particular location?

Kindly help.

Thanks..

Vini

Re: Creating shortcuts

22491728-Mar-04 19:19

224917

28-Mar-04 19:19

http://www.codeproject.com/shell/create_shortcut.asp

greatest thing is to do wot others think you cant
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Re: Creating shortcuts

Milton Karimbekallil28-Mar-04 19:58

Milton Karimbekallil

28-Mar-04 19:58

hi,

you can use the following code to create a shortcut instead of copying an existing one. below code will create a shortcut for notepad in c:\ . Change the path accordingly.

	CString strFile("notepad.exe");<br />
    IShellLink* pLink;<br />
    IPersistFile* pPersistFile;<br />
<br />
<br />
    if(FAILED(CoInitialize(NULL))) throw CString("Failed to initialize COM Library.");<br />
<br />
    if(FAILED(CoCreateInstance(CLSID_ShellLink, NULL, CLSCTX_INPROC_SERVER, IID_IShellLink, (void **) &pLink)))<br />
		throw CString("Failed to initialize COM Library.");<br />
<br />
    pLink->SetPath((LPCTSTR)strFile);<br />
    pLink->SetDescription("Notepad fooooooooooo");<br />
    pLink->SetShowCmd(SW_SHOW);<br />
    if(FAILED(pLink->QueryInterface(IID_IPersistFile, (void **)&pPersistFile))) <br />
		throw CString("Failed to query IID_IPersistFile.");<br />
	CString str("c:\\notepad.lnk");<br />
	CComBSTR path;<br />
	path = str.AllocSysString(); <br />
    pPersistFile->Save(path, true);<br />
    pPersistFile->Release();<br />
	pLink->Release();<br />
<br />
	CoUninitialize();

rgds... mil10.

Re: Creating shortcuts

Vini Deep28-Mar-04 20:37

Vini Deep

28-Mar-04 20:37

Got it... Thanks so much. Smile | :)

Vini

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