Question

新手在这里基本上我想将文件加载到输入流。我收到以下错误

错误C2065：'Stream'：未声明的标识符。

#pragma once
#include <iostream>
#include <iomanip>
#include <sstream>
#include <fstream>

namespace test2 {

  using namespace System;
  using namespace System::ComponentModel;
  using namespace System::Collections;
  using namespace System::Windows::Forms;
  using namespace System::Data;
  using namespace System::Drawing;


  public ref class Form1 : public System::Windows::Forms::Form
  {

    // ...

    private: System::Void browse_Click(System::Object^  sender, System::EventArgs^  e) {
        Stream^ myStream;
        OpenFileDialog^ openFileDialog1 = gcnew OpenFileDialog;

        openFileDialog1->InitialDirectory = "c:\\";
        openFileDialog1->Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
        openFileDialog1->FilterIndex = 2;
        openFileDialog1->RestoreDirectory = true;

        if ( openFileDialog1->ShowDialog() == System::Windows::Forms::DialogResult::OK )
        {
            if ( (myStream = openFileDialog1->OpenFile()) != nullptr )
            {
                //code
                myStream->Close();
            }
        }
    }

  };
}

Answer 1

.NET Stream类在System.IO命名空间中定义，因此您需要...

限定对象声明中的类型名称以及所有后续使用
```
IO::Stream^ myStream;
```
或在代码文件顶部添加using指令
```
using namespace System::IO;
```

Answer 2

您只是忘了为Stream类指定正确的命名空间：

System::IO::Stream^ myStream;

C ++ -'Stream'Undeclared标识符

2 个答案: