error C3767: candidate function(s) not accessible

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Dear All,

I am design the calculator in VC++ I use my own DLL and connect with form application.
I want to save the history of operation like (2+3=5) to file.txt.

when I try to write the function in DLL like this
void setHistory (string a, double b);

in form application I cannot convert textBox to string, I tried to use the marshal also but is not working.

System::String^ clrString = DisplayOperation->Text;
myf->setDisplayHistory(marshal_as<std::string xmlns:std="#unknown">gt;(clrString), LblDisplay->Text);

Posted 15-Apr-15 1:23am

Karam Ibrahim

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Sergey Alexandrovich Kryukov 15-Apr-15 9:14am

What is DisplayOperation, LblDisplay? Where are the declarations?
—SA

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Karam Ibrahim · Accepted Answer · 2015-04-15T05:29:00

Dear Sergey,

all my declarations in my own DLL not in form that,
DisplayOperation->Text; and LblDisplay->Text; both are textBox

the function in DLL is
void Functions::setDisplayHistory(string a, double b)
{
ofstream readFile("Calculator.txt", fstream::in);
if (readFile.is_open())
{
readFile << a << " = " << b << endl;
readFile.close();
}
}

don't look the Functions:: and myf because there are connect with the name of project.
but why I cannot sent the string to function above it show me the error. and also it right
setDisplayHistory((error-type) *a, double b)