C / C++ / MFC

Valentinor7-Feb-21 4:46

Valentinor

7-Feb-21 4:46

I'm sorry but how is that theory goin to help someone who doesn't know what code to use? OK, I'm learning the theory behind it, but that isn't goin to help me write the code. I never said that I have a good knowledge when it comes to C/C++. Actually it is kinda bad, that is why this function is goin to be called as a native one.

Just out of curiosity, have you ever thought that maybe there are some that understand better by seeing it in practice then reading about the theory behind certain things? And surely I'm not the only one, after all there is this saying "Practice makes perfect".

Dave Kreskowiak7-Feb-21 6:29

Dave Kreskowiak

7-Feb-21 6:29

You apparently didn't look at the rest of the page, especially the navigation down the left side, and completely missed the link to "Reference", which gives you all of the functions involved with WCS and the documentation on each.

If you're looking for someone to write the code for you, or to copy, I can't help you there. I have no need of color correction at all and don't have the time to the someone's research for them.

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

Richard MacCutchan6-Feb-21 5:11

6-Feb-21 5:11

Valentinor wrote:
will affect certain people by at least demoralizing them.

So are you saying it is demoralizing to be given a link to the documentation?

Valentinor wrote:
Not everyone is good at searching on google for the answer

I just Googled for the name of the API function that is in your question; why do you think that is difficult?

Valentinor wrote:
As for what you said that, in that paragraph it says not to use it, yeah it is true, but it also says the following "Use of this API is subject to major limitations", so it's not like not to use it because it is bad, but because other reasons.
As for the other part, it is actually a good thing in that situation that it doesn't uses what you give it, and it actually is telling you why in documentation, because it may lead to an unusable screen.

So you have the complete answer, why complain?

Creating c++ static library that uses 3rd party static libraries.

Valentinor6-Feb-21 21:44

Valentinor

6-Feb-21 21:44

Quote:
So are you saying it is demoralizing to be given a link to the documentation?

I wasn't talking about that answer. Giving a link to documentation is a good start when you don't really know the answer, in hopes that the person who asked the question didn't checked it before.

Quote:
I just Googled for the name of the API function that is in your question; why do you think that is difficult?

So with that I wasn't talking about me, it was in general, everything in that statement beside the part at the end, was something I observed over the time.

Quote:
So you have the complete answer, why complain?

I didn't said the problem is solved. In the above message in responds to what Dave Kreskowiak said, I went into more details about the problem, as no one even tried to ask more question to understand the problem better, in case maybe it wasn't explained properly, which the founder of this website actually encourages to do so.

Quote:
If a question is poorly phrased then either ask for clarification...

I'm glad that you actually read the whole thing, even tho there were some misunderstandings about the message it was meant to deliver.

Maximilien1-Feb-21 9:02

Maximilien

1-Feb-21 9:02

(C++ and Visual Studio 2019)

We have a 3rd party library that we want to use (we build from source and it generates many, many static libs).

I want to create an abstraction layer on top of this 3rd party library, as a static library.

And I want my client application to use my own abstraction layer so it does not have to directly include the 3rd party headers.

Can I "link" the 3rd party libraries (libs) in my own library so that I can just link we one library in my client application ?

Or I will need to link my application with the 3rd party libraries as well as my own library ?

I'd rather be phishing!

Re: Creating c++ static library that uses 3rd party static libraries.

Richard MacCutchan1-Feb-21 9:09

Re: Creating c++ static library that uses 3rd party static libraries.

1-Feb-21 9:09

If you create a static library that links to other statics then the result should be a single static library. A simple test should confirm it for you.

Maximilien3-Feb-21 3:29

Maximilien

3-Feb-21 3:29

Crikey

I did not even look at that (bad case of mondaying)

It seems to be working.

Thanks Richard.

I'd rather be phishing!

Re: Creating c++ static library that uses 3rd party static libraries.

Richard MacCutchan3-Feb-21 5:27

Re: Creating c++ static library that uses 3rd party static libraries.

3-Feb-21 5:27

Yes, it's the sort of question that gets you overthinking in your head. Laugh | :laugh:

Mircea Neacsu1-Feb-21 9:11

Mircea Neacsu

1-Feb-21 9:11

You can create a "composite" that includes your modules and all modules from 3rd party libraries.

About including the 3rd party header files, it depends how good of a job you do at hiding the internals from your users.

Thing to keep in mind: remove any #pragma directives that reference the previous libraries. Place only one referring to your "composite" lib in one of your main include files.

Mircea

c++

Member 1505868328-Jan-21 4:05

Member 15058683

28-Jan-21 4:05

float radius =20

Re: c++

jeron128-Jan-21 4:30

jeron1

28-Jan-21 4:30

That line won't compile.

"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
"I don't drink any more... then again, I don't drink any less." - Mike Mullikins uncle

Set precision based on a condition in cout

amine zawix27-Jan-21 23:24

amine zawix

27-Jan-21 23:24

Hello

#include <iostream>
#include <arpa/inet.h>
#include <math.h>
#include <iomanip> 
using namespace std;

		double asDouble ( double price_numerator, double number_of_decimal )
		{

			//if (price_numerator == -2147483648)
		//	{

		//		return -214748.3648;
			//}
			return price_numerator /  pow10(number_of_decimal);
		}

int main()
{
bool someBool = true; //just for testing 
    double x = asDouble(-2147483648 , 4) ;
    double y = asDouble(5456 , 4) ;
    cout<< (someBool ? std::setprecision(10) :  std::setprecision(6)) << x<< endl;
     cout<< (someBool ? std::setprecision(10) :  std::setprecision(6) )<< y<< endl;


    return 0;
}

so I want the precision to be set based on condition, but the output is :

-214748
0.5456

so I want this output :

-214748.3648
0.5456

Re: Set precision based on a condition in cout

11917640 Member 28-Jan-21 1:25

11917640 Member

28-Jan-21 1:25

I made the following change, and result is as expected:

C++

double x = asDouble(-2147483648.0, 4);    // instead of asDouble(-2147483648, 4);

Your code is not compiled for me, the error is:

error C4146: unary minus operator applied to unsigned type, result still unsigned

So, your conditional precision is OK, the problem is that 2147483648 is more than maximal unsigned int value, and applying unary minus operator to it gives compiler error in my case, and unexpected result in your case. Probably your compiler gives some warning for this line, don't ignore it.

Output:

-214748.3648
0.5456

Tested with VC++ 2015.

modified 28-Jan-21 7:33am.

Add Window procedure to picture control

Gopi Nath26-Jan-21 18:02

26-Jan-21 18:02

Hello,

In a dialog, i have added picture control from resource. in this i am displaying an image accordingly at the runtime which is working fine.

I need to zoom in / zoom out the displayed image according to mouse wheel move. I thought of adding window procedure to that picture control, so that i can handle mouse command over there. in MFC, i can see options and examples, but in win32 api, i dont know how to do that.

Can anyone suggest me how to do.

Regards,
Gopi.

CPallini26-Jan-21 20:30

CPallini

26-Jan-21 20:30

This article series could possibly help: Custom Controls in Win32 API: The Basics[^].

"In testa che avete, Signor di Ceprano?"
-- Rigoletto

Gopi Nath26-Jan-21 22:04

26-Jan-21 22:04

Thanks,

will check on this.

Victor Nijegorodov26-Jan-21 20:35

Victor Nijegorodov

26-Jan-21 20:35

Just derive your own class from the CStatic (picture control is a static control), create the control member variable in the dialog for this picture control, and handle any Windows message you need in this derived class.

Gopi Nath26-Jan-21 22:08

26-Jan-21 22:08

Thanks.

my application is in win32 and picture control created through toolbox. how to subclass this control to CStatic (MFC) derived class?

Victor Nijegorodov26-Jan-21 23:32

Victor Nijegorodov

26-Jan-21 23:32

Use MFC class Wizard to derive new MFC class from CStatic (say CMyPicture);
Change the control ID of your picture control from IDC_STATIC to something more sensible (like IDC_MYPICTURE);
Use MFC class Wizard to create the control member variable (of the new created type CMyPicture) for your picture control.

Also see MSDH (docs.microsoft.com) for details.

Gopi Nath27-Jan-21 0:51

27-Jan-21 0:51

Thank you.

Will give it a try.

Battleship game in C

Julien JG725-Jan-21 9:28

Julien JG7

25-Jan-21 9:28

Does someone have a code in c, for a battleship game, i have to do it on codeblock

Thank you

Re: Battleship game in C

Maximilien25-Jan-21 10:18

Maximilien

25-Jan-21 10:18

You should try doing it yourself.

It's more fun.

I'd rather be phishing!

Re: Battleship game in C

Richard MacCutchan25-Jan-21 21:47