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  1. #1
    Join Date
    Feb 2024
    Posts
    2

    C2882: 'ClassLibrary2' : illegal use of namespace identifier in expression

    Hi all,

    I need your help.I am working on a class library project using c++ to create the function that I want to use to call the function from my windows application.

    When I try this:

    Code:
    ClassLibrary2a^ class1a = gcnew ClassLibrary2a;

    I am getting the errors:

    C2882: 'ClassLibrary2a' : illegal use of namespace identifier in expression
    C2065: 'class1a' : undeclared identifier
    C2061: syntax error : identifier 'ClassLibrary2a'


    I have added the ClassLibrary2a dll in the reference but it have make no different as I am still getting the same errors.


    Here is my form code:

    #pragma once


    Code:
    namespace test_window_application {
    
    	using namespace System;
    	using namespace System::ComponentModel;
    	using namespace System::Collections;
    	using namespace System::Windows::Forms;
    	using namespace System::Data;
    	using namespace System::Drawing;
    	using namespace ClassLibrary2a;
    
    
    	/// <summary>
    	/// Summary for Form1
    	///
    	/// WARNING: If you change the name of this class, you will need to change the
    	///          'Resource File Name' property for the managed resource compiler tool
    	///          associated with all .resx files this class depends on.  Otherwise,
    	///          the designers will not be able to interact properly with localized
    	///          resources associated with this form.
    	/// </summary>
    	public ref class Form1 : public System::Windows::Forms::Form
    	{
    	public:
    		Form1(void)
    		{
    			InitializeComponent();
    			//
    			//TODO: Add the constructor code here
    			//
    		}
    
    	protected:
    		/// <summary>
    		/// Clean up any resources being used.
    		/// </summary>
    		~Form1()
    		{
    			if (components)
    			{
    				delete components;
    			}
    		}
    	private: System::Windows::Forms::Button^  button1;
    	protected: 
    
    	private:
    		/// <summary>
    		/// Required designer variable.
    		/// </summary>
    		System::ComponentModel::Container ^components;
    
    #pragma region Windows Form Designer generated code
    		/// <summary>
    		/// Required method for Designer support - do not modify
    		/// the contents of this method with the code editor.
    		/// </summary>
    		void InitializeComponent(void)
    		{
    			this->button1 = (gcnew System::Windows::Forms::Button());
    			this->SuspendLayout();
    			// 
    			// button1
    			// 
    			this->button1->Location = System::Drawing::Point(78, 116);
    			this->button1->Name = L"button1";
    			this->button1->Size = System::Drawing::Size(75, 23);
    			this->button1->TabIndex = 0;
    			this->button1->Text = L"button1";
    			this->button1->UseVisualStyleBackColor = true;
    			this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
    			// 
    			// Form1
    			// 
    			this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
    			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
    			this->ClientSize = System::Drawing::Size(284, 262);
    			this->Controls->Add(this->button1);
    			this->Name = L"Form1";
    			this->Text = L"Form1";
    			this->ResumeLayout(false);
    
    		}
    #pragma endregion
    	private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
    				 //ClassLibrary2a^ class1a = gcnew ClassLibrary2a::Class1;
    				 ClassLibrary2a^ class1a = gcnew ClassLibrary2a;
    				 
    
    			 }
    	};
    }


    Here is the ClassLibrary2a code:

    // ClassLibrary2a.h

    #pragma once

    using namespace System;
    using namespace System::ComponentModel;
    using namespace System::Collections;
    using namespace System::Windows::Forms;
    using namespace System:ata;
    using namespace System:iagnostics;
    using namespace System::IO;


    Code:
    namespace ClassLibrary2a {
    
    	public ref class Class1
    	{
    		// TODO: Add your methods for this class here.
    		public: void MyMethodNew() {
    			// Do something in the method
    			//ContactsControl^ contact = gcnew ContactsControl();
    			//contact->label1->Text = "hello chris";
    			MessageBox::Show("message", "title");
    		}
    	};
    
    	
    }

    I dont really understand why I am getting the errors as it doesn't make any sense. I have included the `using namespace ClassLibrary2a` but it have make no different. I am using managed c++/cli

    Do you know why I am getting the errors?

    Do you know how I can fix it?

    I have tried everything included the namespace and added in the reference but it have make no different. I couldn't be able to find out myself how to resolve it.

    Any advice would be much appreciated.

  2. #2
    VictorN's Avatar
    VictorN is offline Super Moderator Power Poster
    Join Date
    Jan 2003
    Location
    Hanover Germany
    Posts
    20,401

    Re: C2882: 'ClassLibrary2' : illegal use of namespace identifier in expression

    I guess your problem is in your code: it has nothing to do with the native C++, it looks like Managed C++/CLI.
    So I'll move your question to the more appropriate forum.
    Victor Nijegorodov

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