[RESOLVED] Imported C# DLL in C++ project - left of '.ToString' must have class/struct/union

[bigteks]

I have a project needing simultaneous access to 2 different APIs. One API library is only available in C++ and the other in C#. I am building the main project in C++ and importing the C# DLL. Right now I am trying to figure out how to do that step properly. I created some sample code to try to figure this out. Here is a test DLL in C#:

namespace CsharpDLL
{
    using System;

    public class classTime
    {
        public classTime() { }
        public DateTime Latest()
        {
            return DateTime.Now;
        }
    }
}

Here is the C++ event handler that tries to access the above imported class. m_edit1_text is a CString text-control variable for an edit box:

void CCppCsharpComboDlg::OnBnClickedDate()
{
	// TODO: Add your control notification handler code here

	CsharpDLL::classTime^ myDate = gcnew CsharpDLL::classTime;

	m_edit1_text = myDate->Latest.ToString;
		// Update the dialog with the values
	UpdateData(FALSE);
}

The m_edit1_text assignment generates this error: left of '.ToString' must have class/struct/union

I am having trouble spotting what is causing the error.

[bigteks]

I am using Visual C++ & C# 2019 v142 with /clr enabled in both projects. I am using .NET 4.7.2.

[wolle]

The m_edit1_text assignment generates this error: left of '.ToString' must have class/struct/union

From the error message and your code it seems like Latest is a method. In that case () is missing and it should probably look like this,

m_edit1_text = myDate->Latest().ToString;

Also to me ToString sounds like a method name and in that case another pair of parentheses are probably missing,

m_edit1_text = myDate->Latest().ToString();

[bigteks]

Thanks Wolle, that was it.