C / C++ / MFC

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.

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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

25-Jan-21 21:47

Sorry, this site does not provide code to order.

Re: Battleship game in C

David Crow26-Jan-21 4:16

David Crow

26-Jan-21 4:16

Julien JG7 wrote:
Does someone have a code in c, for a battleship game, i have to do it on codeblock

So if YOU have to do it, why are you asking for SOMEONE ELSE's code? Confused | :confused:

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typical NASM usage

Calin Negru23-Jan-21 23:29

Calin Negru

23-Jan-21 23:29

What is a common way to use NASM (or other assembly compilers) when developing windows applications. Do you integrate it with VisualStudio shell or you go down the path of always using the command line?

Re: typical NASM usage

Richard MacCutchan24-Jan-21 0:55

24-Jan-21 0:55

I would not try to write Windows applications in assembler unless you have a very good reference manual for all the system calls.

As to your question, this may be of interest: The Netwide Assembler (NASM) - Visual Studio Marketplace[^].

Re: typical NASM usage

harold aptroot24-Jan-21 17:27

harold aptroot

24-Jan-21 17:27

The usual way to integrate assembly files into a C++ project is to add the MASM "build customization" (right click a project, go to Build Dependencies > Build Customizations, check the box in front of MASM). Then you can include .asm files as normal sources without needing to do anything weird. You can install vsyasm and use YASM that way, if you prefer a more NASM-y syntax. Using NASM itself is possible, but as far as I know there's no nice integration like that, you can set it up manually as a custom build tool.

Similar information is in microsoft docs.

Re: typical NASM usage

Calin Negru24-Jan-21 20:23

Calin Negru

24-Jan-21 20:23

thanks harold aptroot, Richard

modified 25-Jan-21 4:09am.

dicom error

sureshpondicherry21-Jan-21 7:46

sureshpondicherry

21-Jan-21 7:46

Hi,
I recently upgraded the solution from VS 2015 to VS 2017 enterprise edition. When i build the solution am getting this error.

Error LNK2019 unresolved external symbol _vsprintf referenced in function _COND_PushCondition ctn_lib.lib(condition.obj) 1

Any clue is highly appreciated.

Kind regards,
Suresh

Re: dicom error

Richard MacCutchan21-Jan-21 22:02