How to send float numbers from a C# application to a C++ application?

Question

I have two applications:

1.: C# GUI application written in VisualStudio 2013.

2.: C++ GUI application written in VisualStudio 2013.

I would like to send float numbers from application #1 to application #2.

(In other words: If the C# app. calculates a float number (e.g.: 12.32) then I would like to see this number on the standard output written by the C++ application.)

What is the easiest way to accomplish this? Is there any Windows API, or common-memory-address-thing, etc. to accomplish this?

moien · Accepted Answer · 2017-08-20T14:37:02.423

2

Hmmm... There's some way's to do it (what i know) :

Using Sockets
Using Shared Memory
Using Read Write Files
Using P\Invoke to Change Controls Text
Using IPC Channels

If i want do this on GUI Applcation i'll choose P\Invoke but if i want do something background i'll choose IPC Channels or Shared Memory (IPC Channels is better)

edited Aug 20 '17 at 14:37

answered Oct 09 '16 at 16:50

moien

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score 2 · Answer 2 · answered Oct 09 '16 at 16:58

2

You can do this using any kind of inter-process communication mechanism. The simplest one might be anonymous pipes. You will find how to use anonymous pipes here in C++ and there in C#.

answered Oct 09 '16 at 16:58

shrike

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score 1 · Answer 3 · answered Oct 09 '16 at 19:05

I assume both applications are running at the same time. I would do a local transfer using sockets or I assume that the c++ application just catches the data from the C# app so you can return it as a data object and pass that to the spawning C++ app as an argument.

score 1 · Answer 4 · answered Oct 10 '16 at 02:59

One of the easiest ways is to dump the values to a file in C# then pick them up in C++.

note: This method is not the most reliable/fastest and may not be best for enterprise product but for a quick one time need this should work fine.

Save the output to a file...

using System.IO;

class ConsoleApplication {
    static void Main()
    {
        using (BinaryWriter writer = new BinaryWriter(File.Open("temp.dat", FileMode.Create)))
        {
            writer.Write(1.2345F);
        }
    } }

Then read it in using c++... (Source is here)

#include <iostream>

int main(void)
{
    FILE *r_file = NULL;
    float fd_value = 0;

    r_file = fopen("temp.dat", "rb");
    if (NULL == r_file)
        return 0;

    fread(&fd_value, 1, sizeof(fd_value), r_file);
    fclose(r_file);


    printf("fd_value = %f\n", fd_value);
    return 0;
}

How to send float numbers from a C# application to a C++ application?

4 Answers4