在C++/CLR中的線程編程

Question

我真的很難在Visual C++/CLR中使用Thread編程。我搜查了很多，在互聯網上發現了很多資料，包括官方資源，但我仍然感到困惑。 C++/CLR的資源非常少。它們大多數用於C＃或舊式C++。我嘗試運行這個簡單的代碼。我選擇了一個類型爲clr console applicatioN的新項目，並將下面的代碼放在那裏，但是我收到了錯誤信息，我並沒有對其進行解釋。

// thread_clr.cpp : main project file. 

#include "stdafx.h" 

using namespace System; 
using namespace System; 
using namespace System::Threading; 
class MessagePrinter; 

// class ThreadTester demonstrates basic threading concepts 
class ThreadTester 
{ 
    static int Main() 
    { 
     // Create and name each thread. Use MessagePrinter's 
     // Print method as argument to ThreadStart delegate. 
     MessagePrinter printer1 = gcnew MessagePrinter(); 
     Thread thread1 = gcnew Thread (gcnew ThreadStart(printer1.Print)); 
     thread1.Name = "thread1"; 

     MessagePrinter printer2 = gcnew MessagePrinter(); 
     Thread thread2 = gcnew Thread (gcnew ThreadStart(printer2.Print)); 
     thread2.Name = "thread2"; 

     MessagePrinter printer3 = gcnew MessagePrinter(); 
     Thread thread3 = gcnew Thread (gcnew ThreadStart(printer3.Print)); 
     thread3.Name = "thread3"; 

     Console.WriteLine("Starting threads"); 
     // call each thread's Start method to place each 
     // thread in Started state 
     thread1.Start(); 
     thread2.Start(); 
     thread3.Start(); 

     Console.WriteLine("Threads started\n"); 
    } // end method Main 
}; // end class ThreadTester 

class MessagePrinter 
{ 
    private int sleepTime; 
    private static Random random = gcnew Random(); 

    // constructor to initialize a MessagePrinter object 
    public MessagePrinter() 
    { 
     // pick random sleep time between 0 and 5 seconds 
     sleepTime = random.Next(5001); 
    } 

    //controls Thread that prints message 
    public void Print() 
    { 
     // obtain reference to currently executing thread 
     Thread current = Thread.CurrentThread; 

     // put thread to sleep for sleepTime amount of time 
     Console.WriteLine(current.Name + " going to sleep for " + sleepTime); 

     Thread.Sleep (sleepTime); 

     // print thread name 
     Console.WriteLine(current.Name + " done sleeping"); 

    } // end method Print 
} // end class MessagePrinter 

請幫忙。或者更好的是，請引導我參加一些教程或其他影響。我明白，這不是一個教程網站，我不是問一個，但我會感激，如果有人可以至少指出了C++/CLR線程的資源。 C++/CLR Winform線程。真的很感激它

問候

有些錯誤是：

'PRINTER1' 使用未定義類MessagePrinter '打印'：不是的 成員 '系統::的Int32'「系統:: Threading :: ThreadStart'：a 委託構造函數需要2個參數 '系統::線程::線程::線程'：沒有適當的默認 構造函數可用'System :: Threading :: Thread :: Thread' ：no 適當的默認構造函數可用'語法錯誤：'int'sho在'未被管理的' 'MessagePrinter'可能沒有聲明一個全局或靜態變量，或一個 成員的引用gc堆中的對象的本機類型 ' MessagePrinter :: random'：你不能在原生類型'MessagePrinter :: random'中嵌入參考 類型'System :: Random'的實例： 只有靜態常量整型數據成員可以在 類中被初始化' MessagePrinter」前應先‘：’‘無效’應該是 前面加‘：’

Answer 1

我固定的代碼對你來說，但首先讓我說一件事：你真的需要先學習基礎知識。這甚至不是C++/CLI代碼，並且您沒有發現或無法修復最明顯的語法錯誤。忘記線程一段時間，他們很難。先學習基本的東西。

#include "stdafx.h" 

using namespace System; 
using namespace System::Threading; 

ref class MessagePrinter 
{ 
private: 
    int sleepTime; 
    static Random^ random = gcnew Random(); 

// constructor to initialize a MessagePrinter object 
public: 
    MessagePrinter() 
    { 
     // pick random sleep time between 0 and 5 seconds 
     sleepTime = random->Next(5001); 
    } 

    //controls Thread that prints message 
    void Print() 
    { 
     // obtain reference to currently executing thread 
     Thread^ current = Thread::CurrentThread; 

     // put thread to sleep for sleepTime amount of time 
     Console::WriteLine(current->Name + " going to sleep for " + sleepTime); 

     Thread::Sleep (sleepTime); 

     // print thread name 
     Console::WriteLine(current->Name + " done sleeping"); 

    } // end method Print 
}; // end class MessagePrinter 

int main() 
{ 
    // Create and name each thread. Use MessagePrinter's 
    // Print method as argument to ThreadStart delegate. 
    MessagePrinter^ printer1 = gcnew MessagePrinter(); 
    Thread^ thread1 = gcnew Thread(gcnew ThreadStart(printer1, &MessagePrinter::Print)); 
    thread1->Name = "thread1"; 

    MessagePrinter^ printer2 = gcnew MessagePrinter(); 
    Thread^ thread2 = gcnew Thread (gcnew ThreadStart(printer2, &MessagePrinter::Print)); 
    thread2->Name = "thread2"; 

    MessagePrinter^ printer3 = gcnew MessagePrinter(); 
    Thread^ thread3 = gcnew Thread (gcnew ThreadStart(printer3, &MessagePrinter::Print)); 
    thread3->Name = "thread3"; 

    Console::WriteLine("Starting threads"); 
    // call each thread's Start method to place each 
    // thread in Started state 
    thread1->Start(); 
    thread2->Start(); 
    thread3->Start(); 

    Console::WriteLine("Threads started\n"); 
    Console::ReadLine(); 

    return 0; 
} 

Answer 2

知道，你離開的主要功能，併爲此所有的線程會爲t erminated ...所以放置Console.ReadLine()在你的「主」的最後一行...

另外：你的源代碼是C＃，而不是C++/CLI ...