No overload for method 'PassStructIn' takes 4 arguments

Member 12244972

And in my usual fashion of cobbling together source codes before I have grasped the concepts, I give you this glorious error:

The code in question happens to be a call to an unmanaged dll:

class Program
{
public struct Quaternion
{
double w; double x; double y; double z;
}

  \[DllImport("YLScsDrawing.dll")\]
  public static extern void PassStructIn(ref Quaternion myQuaternion);

    static void Main(string\[\] args)
    {
    Program.Quaternion myQuaternion;
    Program.PassStructIn(ref myQuaternion);

    //Yada Yada Yada

    //Then the threading of said function...

    // Abs threads
    Thread absoluteThread = new Thread(unused => Program.PassStructIn((double)absW, (double)absX, (double)absY, (double)absZ));
    absoluteThread.Start();
  	// Abs threads

Please advise on how to fix this... Thanks.

Lost User

You'd need to know how many arguments are expected. The code complains that there is no method accepting four arguments. I'd also advise against using a lambda to start a thread.

Bastard Programmer from Hell :suss: If you can't read my code, try converting it here[^][](X-Clacks-Overhead: GNU Terry Pratchett)

OriginalGriff

You define PassStructIn as taking a single parameter: a reference to a structure you defined above. Then you try to call it by passing four parameters...and you are surprised you get an error? Create an instance of the struct and fill in it's fields. Then pass the ref struct to the external method.

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...

Member 12244972

Perhaps showing the code for the dll will help...

using System;
using System.Collections.Generic;
using System.Text;

namespace YLScsDrawing.Drawing3d
{
public struct Quaternion
{
public double X, Y, Z, W;

    public Quaternion(double w, double x, double y, double z)// This is the set of parameters I wish to call...
    {
        W = w; X = x; Y = y; Z = z;
    }
 }

}

Any suggestions?

OriginalGriff

Well... you could always try:

Quaternion quat = new Quaternion ((double)absW, (double)absX, (double)absY, (double)absZ));
Thread absoluteThread = new Thread(unused => Program.PassStructIn(ref quat);

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...

Member 12244972

The line of code...

Quaternion quat = new Quaternion ((double)absW, (double)absX, (double)absY, (double)absZ);

Brings up the following error.

'Siren.Program.Quaternion' does not contain a constructor that takes 4 arguments

Any other ideas?

OriginalGriff

According to your code sample it does:

public struct Quaternion
{
public double X, Y, Z, W;

public Quaternion(double w, double x, double y, double z)// This is the set of parameters I wish to call...
{
    W = w; X = x; Y = y; Z = z;
}

}

If that is in a separate DLL, then I'd suggest that you check you are referencing the latest version, and that it compiles without errors. Because your code samples are referring to different struct names: Siren.Program.Quaternion in the error message instead of the code sample YLScsDrawing.Drawing3d.Quaternion

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...