C / C++ / MFC Discussion Boards

Re: Using ShellExecute to open a web page as a child of Dialog

David Crow1-Jun-11 3:25

1-Jun-11 3:25

There are only 12 possibilities, and some of those do not apply (e.g., SW_HIDE). In less time than it takes to read this post (and respond), you can have over half of them tested.

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Re: Using ShellExecute to open a web page as a child of Dialog

rp_suman2-Jun-11 1:09

rp_suman

2-Jun-11 1:09

If you want to open the URL in IE even if it is not set as default browser:
ShellExecute(NULL,"open","iexplore.exe", csUrlToOpen, NULL, SW_SHOW);

Regards

--
"Programming is an art that fights back!"

some special charaters like while reading XML.

janaswamy uday1-Jun-11 0:55

janaswamy uday

1-Jun-11 0:55

Hi all,

some special extra charaters like "" are displayed while reading the xml file using CFile.
i dont want that  extra charaters.

Code:
----

int iSz = 0;
DWORD dwFileRead;
int len = (int)file.GetLength();
DWORD dwOffset=0;

char* ReadAsciiBuf = new char[len+1];
_TCHAR* Readbuf = new _TCHAR[len+1];

file.SeekToBegin();
dwFileRead = file.Read(ReadAsciiBuf+dwOffset,len);

memset(Readbuf, 0, (file.GetLength() + 1) * sizeof(TCHAR));
iSz = Mymbstowcs(Readbuf,ReadAsciiBuf,len);
strTempResult = Readbuf;
file.Close();

help me out.

Re: some special charaters like while reading XML.

barneyman1-Jun-11 1:57

barneyman

1-Jun-11 1:57

they're escaped characters in the XML and they're perfectly valid (http://www.w3.org/TR/1999/WD-xml-c14n-19991109.html#charescaping[^])

you're going to either have to translate them, or use an alternative xml parsing library

my advice would be to use an alternative library, the effort taken to learn how to use one will be significantly less, and more rewarding, than trying to write your own, especially if you wish to consume XML generated by a third party product

Two questions about CDockablePane class management programmatically. [modified]

SAMZCN31-May-11 23:31

SAMZCN

31-May-11 23:31

Question 1:
I create one CDockablePane wnd and dock it in the bottom of the parent wnd. The default CDockablePane height is too short and I want to resize the height of the CDP. How to do that?

Btw, if the CDP is docked in the left/right side of the parent wnd, it works well after setting new width.

Question 2:
How to make the CDP floating when initialized. The CDP is initially docked in one side when created? I want to make it floating after it is created in the specified position with an initial size.

I feel very hard to control the CDP programmatically, like floating, resizing and moving with MFC. I found one artical from MS website about docking window management programmatically. But it is for C# Winform, not for MFC.

Still two days no replys come in. Seems not to poplular on CDockablePane class. Cry | :((

Can anyone give help?

NOTE: Ohh.... Confused | :confused:

nobody is interested in CDP usage....Why? Not a good object, is it?

modified on Friday, June 3, 2011 5:49 AM

MFC COM

Pranit Kothari31-May-11 21:36

Pranit Kothari

31-May-11 21:36

Hello,
I am VC++/MFC developer. I know how to create COM ATL. But I am unable to find way to create MFC COM dll. Please suggest me way to create MFC COM.

Regards

Re: MFC COM

వేంకటనారాయణ(venkatmakam)31-May-11 21:41

వేంకటనారాయణ(venkatmakam)

31-May-11 21:41

Check this article.
An MFC COM In-Process Component

http://www.mono-project.com/Main_Page

Re: MFC COM

ShilpiP31-May-11 22:56

ShilpiP

31-May-11 22:56

Perfect 5

Thanks

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May WE be the Reason for someone else to smile always!" (ICAN)

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Re: MFC COM [modified]

ShilpiP31-May-11 22:32

ShilpiP

31-May-11 22:32

Best example of ActiveX control without MFC support:
->[^]

The example given by Venkatmakam is perfect.

modified on Wednesday, June 1, 2011 4:51 AM

Re: MFC COM [modified]

వేంకటనారాయణ(venkatmakam)31-May-11 22:36

వేంకటనారాయణ(venkatmakam)

31-May-11 22:36

But the requirement is to create a COM component using MFC Classes.

http://www.mono-project.com/Main_Page

modified on Wednesday, June 1, 2011 4:48 AM

Re: MFC COM

ShilpiP31-May-11 22:48

ShilpiP

31-May-11 22:48

Oh !! My mistake.. I will update my answer.
Thanks Smile | :)

Re: MFC COM

వేంకటనారాయణ(venkatmakam)1-Jun-11 0:08

వేంకటనారాయణ(venkatmakam)

1-Jun-11 0:08

No problem.Actually the ATL link also very useful for me.I did not worked that much with ATL.

http://www.mono-project.com/Main_Page

Re: MFC COM

ShilpiP1-Jun-11 0:13

ShilpiP

1-Jun-11 0:13

Yes It is very useful and clear the concept of ATL/COM. Just go through with this example Smile | :)

Re: MFC COM

ThatsAlok1-Jun-11 20:41

ThatsAlok

1-Jun-11 20:41

A Beginner tutorial for writing simple COM/ATL DLL[^]

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Angles

Cyclone_S31-May-11 14:48

Cyclone_S

31-May-11 14:48

I got two questions. First I'm making a brick game. I want the ball to bounce off the paddle at different angles depending on where the ball hits the paddle. If the angle variable is specified directly it bounces off in the correct angle but I'm not sure how to calculate the angle depending on where the ball hits the paddle.

double a = 135;
double angle = (Math::PI / 180) * a;
Ball_List[b]->xVel = speed*Math::Cos(angle);
Ball_List[b]->yVel = -speed*Math::Sin(angle);

Second. I want to animate a box going in a circle but I'm Not sure on the math.

Thanks in advance.

Re: Angles

Luc Pattyn31-May-11 14:59

Luc Pattyn

31-May-11 14:59

Cyclone_S wrote:
I want the ball to bounce off the paddle at different angles depending on where the ball hits the paddle

That is pretty vague, and probably not according to normal physics.
Maybe what you want is: the outgoing angle equals the supplement of the incoming angle plus some delta, which is zero in the center and grows when the hit point is away from the center; so maybe calculate that distance and use it to add to or multiply the outgoing angle.

Cyclone_S wrote:
going in a circle

the equations for a circle in two dimensional space are:

(x - xc)^2 + (y - yc)^2 = r^2

x = xc + r * cos(a)
y = yc + r * sin(a)

where (x,y) is a point on the circle, (xc,yc) is the center, r the radius, a an angle in radians.
I cannot believe you would not know that. Look at the equations, they say the point(x,y) is at a fixed distance r from a fixed point (xc,yc).

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Please use <PRE> tags for code snippets, they improve readability.
CP Vanity has been updated to V2.3

modified on Tuesday, May 31, 2011 9:17 PM

Re: Angles

David Crow31-May-11 15:39

David Crow

31-May-11 15:39

Luc Pattyn wrote:
I cannot believe you would not know that.

Just out of curiosity, why would you assume he would know?

Re: Angles

Luc Pattyn31-May-11 15:50

Luc Pattyn

31-May-11 15:50

Assuming he is adolescent or older, he would have learned this and much more at school, both as formula's for describing a circle, and as a geometric illustration for explaining what a sine and cosine actually are. He already was using angles, sine and cosine, in his post, so it puzzles me how he would not come up with the equations if he had ever seen and understood them.

And then there are books, and Google, and Wolfram, etc.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Re: Angles

Cyclone_S5-Jun-11 16:15

Cyclone_S

5-Jun-11 16:15

Thanks for the replies. Both problems are mostly solved. I have the paddle/ball equation figured out but I'm having a problem where any value less then 1 is ignored... any ideas? I need finer precision. Thanks.

Re: Angles

Luc Pattyn5-Jun-11 16:26

Luc Pattyn

5-Jun-11 16:26

Cyclone_S wrote:
I need finer precision

then scale it all up in integers; or use floating-point arithmetic throughout.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Re: Angles

Cyclone_S11-Jun-11 15:38

Cyclone_S

11-Jun-11 15:38

I am using doubles in the function. The problem is I can't move the panel(ball) anything less then 1 pixel. Maybe move the ball 1pixel over a couple of frames? I'm not sure how to do that.

Here is the code.

int speed=Ball_List[b]->speed;
// Paddle center.
int paddle_center = Player->Location.X + Player->Width / 2;

// Ball center.
int ball_center = Ball_List[b]->gameBall->Location.X + Ball_List[b]->gameBall->Width / 2;

// Find the location on the paddle that the ball hit
int paddle_location = ball_center - paddle_center;

// Increase X speed according to distance from center of paddle.
double a=(90-paddle_location);
double angle = (Math::PI / 180) * a; // angle in radians.
Ball_List[b]->xVel = speed*Math::Cos(angle);
Ball_List[b]->yVel = -speed*Math::Sin(angle);

Ball_List[b]->gameBall->Top = Player->Location.Y - 16;

Thanks

Re: Angles

Luc Pattyn11-Jun-11 15:49

Luc Pattyn

11-Jun-11 15:49

All of that could have been floats or doubles; it is only when painting that it eventually needs to be rounded to pixels, hence integers.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Re: Angles

Cyclone_S11-Jun-11 16:28

Cyclone_S

11-Jun-11 16:28

so there's no solution then?

Re: Angles

Stefan_Lang31-May-11 22:51

Stefan_Lang

31-May-11 22:51

You might want to check out this site[Physics engines for dummies] for an easy introduction into the basics of vector algebra used to emulate quasi-physical simulations. You will find that in stead of angles and sinus/cosinus it explains the calculations needed for reflections with the help of vector algebra. Although the code is not C/C++ it should be easy enough to translate the relevant code for your problems.

Garbage Collector vs Reference Couter

Pranit Kothari31-May-11 4:53

Pranit Kothari

31-May-11 4:53

Hello,
In several posts I have read that Garbage Collector and Reference counter are not same? I wanted to know how?

Regards

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