Re: How to color the suqare box of a check button control - C / C++ / MFC Discussion Boards

Carlos Antollini12-Feb-02 8:36

12-Feb-02 8:36

If your project have a couple of resoureces like bitmaps, the exe will be more large than the other....

Regards...

I have yet to meet a C compiler that is more friendly and easier to use than eating soup with a knife.

Carlos Antollini.
Sonork ID 100.10529 cantollini

Re: directX .exe size question

Kuniva12-Feb-02 9:02

Kuniva

12-Feb-02 9:02

Well you see, thats the odd thing about it. The directX SDK sample has a bitmap and an icon in it but the project i compiled following the tutorial doesn't have ANY resources so its supposed to be smaller!!! but its not!! its more than 3 times larger, it has to do something with the options or includes or something but i cant firgure out what...

Confused | :confused:

Kuniva
--------------------------------------------
God gave man a penis and a brain but not enough blood to make both of 'em work at the same time.

How to Access in a managed C++ ArrayList?

12-Feb-02 8:17

Hi,
i have this problem I have declared an arrayLIst in Managed c++ and i have inserted all the values there but now i Cann't get the values out again . The Values that i have inserted are some objects. i used getEnumerator function to access the ArrayList but it's telling me that can not convert a type System::object to "my Object".
what am I doing wrong?
is there another list type structer in managed C++?
thank in advance for your help and time ,
Endri

Creating a New Document

Jerry Wang12-Feb-02 7:46

Jerry Wang

12-Feb-02 7:46

Hi, I have a MDI MFC application and I would like to tell it to create a new empty document (basically the same as going to File->New). Can anyone tell me what the function call is to do this?

Thanks! Smile | :)

Re: Creating a New Document

alex.barylski12-Feb-02 9:10

alex.barylski

12-Feb-02 9:10

The Framework calls OnNewDocument() so unless calling this function directly asserts (I've never tried it) that should work.

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: Creating a New Document

Roger Allen13-Feb-02 3:05

Roger Allen

13-Feb-02 3:05

If you can get a pointer to the document template you can call:

pDocTemplate->OpenDocumentFile(NULL) ; // create a new empty document

Doc templates can be got through the m_pDocManager pointer of the CWinApp object. You need to iterate it using a POSITION object. Or, if you have an existing document object of the type you want to create, you can call GetDocTemplate() on your document object to get a pointer to it.

Roger Allen
Sonork 100.10016

If I'm not breathing, I'm either dead or holding my breath.
A fool jabbers, while a wise man listens. But is he so wise to listen to the fool?
Please step to the rear of the car and make room for more victims. - John Simmons the Outlaw programmer, 1st Feb 2002, in the lounge

How to color the suqare box of a check button control

Jyoti12-Feb-02 7:01

Jyoti

12-Feb-02 7:01

I am trying to color the square box of the check button control.
I have had no luck finding code to do it. I would appreciate any help.
thanks.

Jyoti

Re: How to color the suqare box of a check button control

alex.barylski12-Feb-02 9:08

alex.barylski

12-Feb-02 9:08

You could use DrawFrameControl() or Draw3dRect().

Cheers!

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: How to color the suqare box of a check button control

Jyoti13-Feb-02 9:01

Jyoti

13-Feb-02 9:01

Can you give me some sample code if you have it.
I wasn't succesful using DrawFrameControl function.
thanks.

Jyoti

Re: How to color the suqare box of a check button control

alex.barylski13-Feb-02 13:25

alex.barylski

13-Feb-02 13:25

CDC dc = GetDC();

CRect rect = {10, 10, 100, 100};

dc.DrawFrameControl(&rect, DFC_BUTTON, DFCS_BUTTONPUSH);

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Bit-Shifting - What is it?

User 665812-Feb-02 6:39

User 6658

12-Feb-02 6:39

Hi
I've often seen programs (in most cases c programs) that use one or more of the following operators:

<<, >>

It is called bit-shifting. I saw an ID3-tagger program that uses this commands as well.

Now my question:

What does "bit-shifting" actually do and what is it good for?

Any articles or explanation is greatly appreciated Smile | :)

regards
Gregor

modified 12-Sep-18 21:01pm.

Re: Bit-Shifting - What is it?

The other Chris Losinger12-Feb-02 6:51

The other Chris Losinger

12-Feb-02 6:51

it shifts the bits to the left (<< ) or the right (>>).

if you have a BYTE x equal to 4, it looks like this in binary: 00000100. if you shift this to the left 2 bits, you get 00010000 (16).

it's used when you need to get at the individual bits in a value. i use it all the time in image processing when the size of the pixels is not an even multiple of 8 (like in a 1 or 4 bits per pixel image).

-c

Re: Bit-Shifting - What is it?

Rick York12-Feb-02 6:52

Rick York

12-Feb-02 6:52

It actually shifts the bits in the number. It is sometimes used for quick multiplication or division. Here are some examples :

<br />
<br />
int x = 5 << 3;<br />
<br />
in binary, 5 is   00000101<br />
shifted left 3 is 00101000<br />
<br />
This has the effect multiplying by 8.<br />
<br />
Another one :<br />
<br />
int y = 40 >> 3;<br />
<br />
in binary 40 is    00101000<br />
shifted right 2 is 00000101<br />
<br />
This is dividing by 8<br />
<br />

Re: Bit-Shifting - What is it?

User 665812-Feb-02 7:02

User 6658

12-Feb-02 7:02

Erm, well, could you please explain what bit-shifting is used for in this case:

fprintf( outfile, "%d.%d.%d.%d:%hu\n",
			(ipaddr>>24)&0xff, (ipaddr>>16)&0xff,
			(ipaddr>>8)&0xff, ipaddr&0xff, port);

This is a code snippet of a tool that queries server and displays there IPs. This is actually what the above code does.

But I have no idea what it really does Confused | :confused:

maybe you could explain to me Smile | :)

idaddr is declared as

unsigned int ipaddr= ntohl(server->ipaddr);

And one last question:
How do I make keywords appear in red color in this message board?

modified 12-Sep-18 21:01pm.

Re: Bit-Shifting - What is it?

Joaquín M López Muñoz12-Feb-02 7:05

Joaquín M López Muñoz

12-Feb-02 7:05

An unsigned int consists of 32 bits, so you can see it as a packed array of 8-bit values --precisely what one needs to store a numeric IP address a.b.c.d. ipaddr&0xFF (or-ing with the binary number 0000 0000 0000 1111) yields the value of d. Shifting the appropriate number of bits and repeating the or-ing trick yields th remaining values.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Bit-Shifting - What is it?

Nemanja Trifunovic12-Feb-02 7:08

Nemanja Trifunovic

12-Feb-02 7:08

Arrgh... This time you were faster. Wink | ;)

I vote pro drink Beer | [beer]

Re: Bit-Shifting - What is it?

Joaquín M López Muñoz12-Feb-02 7:11

Joaquín M López Muñoz

12-Feb-02 7:11

Arrgh... This time you were faster.

the pretty formatting notwithstanding Smile | :)

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Bit-Shifting - What is it?

Nemanja Trifunovic12-Feb-02 7:07

Nemanja Trifunovic

12-Feb-02 7:07

Gregor S. wrote:
fprintf( outfile, "%d.%d.%d.%d:%hu\n", (ipaddr>>24)&0xff, (ipaddr>>16)&0xff, (ipaddr>>8)&0xff, ipaddr&0xff, port);

This will split your 4-byte number ipaddr into individual bytes and print them.

I vote pro drink Beer | [beer]

Re: Bit-Shifting - What is it?

12-Feb-02 8:17

Thanks for your example.

I finally understand most of this memory manipulation stuff now.

11111111 11111111 11111111 11111111

11000000 10101000 00000000 00000001

<<24:
[00000000 00000000 00000000] 11000000

<<16:
[00000000 00000000 00000000] 10101000

<<8:
[00000000 00000000 00000000] 00000000

<<0 (not shifted):
[00000000 00000000 00000000] 00000001

To get keywords to appear in red, enclose them in <span style="color:red"> and </span>

static_cast error

RobJones12-Feb-02 6:30

RobJones

12-Feb-02 6:30

Hello,
Can anyone tell me why I get this error?

error:
error C2243: 'static_cast' : conversion from 'class IStopwatch *' to 'struct IUnknown *' exists, but is inaccessible

Here is the code:
<pre>
HRESULT __stdcall CStopwatch::QueryInterface(REFIID riid, void **ppvObject)
{
HRESULT hr = S_OK;

if(riid == IID_IUnknown)
*ppvObject = static_cast<IUnknown*>(static_cast<IStopwatch*>(this)); <-- error
else if (riid == IID_IStopwatch)
*ppvObject = static_cast<IStopwatch*>(this);
else
{
ppvObject = NULL;
hr = E_NOINTERFACE;
}

if(SUCCEEDED(hr))
(static_cast<IUnknown*>(*ppvObject))->AddRef();

return hr;
}
</pre>

Here is my header:

<pre>
#if !defined(AFX_STOPWATCH_H__CF2EC9CF_CCAA_4708_8320_0B5A054E3876__INCLUDED_)
#define AFX_STOPWATCH_H__CF2EC9CF_CCAA_4708_8320_0B5A054E3876__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include <windows.h>

class IStopwatch : IUnknown
{
public:
//IStopwatch specific functions
virtual HRESULT __stdcall Start() = 0;
virtual HRESULT __stdcall ElapsedTime(float *Time) = 0;
};

class CStopwatch : public IStopwatch
{
public:
CStopwatch();
virtual ~CStopwatch();

private:
// The frequency of the counter
// returned by QueryPerformanceCounter()
LARGE_INTEGER m_nFrequency;

// The counter value when the start method was last called.
LARGE_INTEGER m_nStartTime;

public:
// IUnknown methods
HRESULT __stdcall QueryInterface(REFIID riid, void** ppvObject);
unsigned long __stdcall AddRef();
unsigned long __stdcall Release();

// IStopwatch specific functions
HRESULT __stdcall Start();
HRESULT __stdcall ElapsedTime(float *Time);
};

#endif // !defined(AFX_STOPWATCH_H__CF2EC9CF_CCAA_4708_8320_0B5A054E3876__INCLUDED_)
</pre>

Thanks,
Rob

Re: static_cast error

pba_12-Feb-02 6:38

pba_

12-Feb-02 6:38

IStopwatch inherits as private from IUnknown. Inherit public from IUnknown ( IStopwatch : public IUnknown )

Re: static_cast error

RobJones12-Feb-02 6:48

RobJones

12-Feb-02 6:48

Thanks!

dumb mistake

Rob

One simple question =>

12-Feb-02 4:39

How to PostMessage "NM_DBLCLK" to a Clistctrl ?
Thanx Rose | [Rose]

Re: One simple question =>

Ravi Bhavnani12-Feb-02 5:08

Ravi Bhavnani

12-Feb-02 5:08

Notification messages are sent by controls to their parent window. To simulate a double-click (I assume that's what you want to do), you should post a WM_LBUTTONDBLCLK message to the list control.

/ravi

"There is always one more bug..."
ravib@ravib.com
http://www.ravib.com

Re: One simple question =>

12-Feb-02 5:21

A small example will be great.. Rose | [Rose]

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