在 C++ CLI 中将参数传递给线程 [英] Pass parameters to thread in C++ CLI

问题描述

我搜索了每个主题以正确创建带有参数 (wstring) 的新线程，但没有任何效果.我该如何解决我的问题?我为我的 .Net UI 应用程序创建了这个项目，所以之前我使用 std::thread 和 std::mutex，但 VSC++ Forms 中的惊人".NET 不支持它.

I searched every topic to correctly create new thread with parameter (wstring) but nothing works. How can I solve my problem? This project I create to my .Net UI Application, so earlier I use std::thread and std::mutex but "amazing" .NET in VSC++ Forms doesn't doesn't support it.

namespace indx
{
ref class FileIndex
{
public:
    FileIndex();
    FileIndex(FileIndex ^);
    virtual ~FileIndex();

    // func
    void getDrives();
    void Diving(const wstring &);
    void Processing();
};

void FileIndex::Diving(Object^ data)
{
    // do smth.
    // any recursion 
}

void FileIndex::Processing()
{
    vector<DriveInfo>::iterator ittr = LDrivers->begin();
    for(counter = 0; ittr != LDrivers->end(); ittr++)
    {
        if(ittr->type == L"Fixed" || ittr->type == L"Removable")
        {
            // need new thread(&FileIndex::Diving, this, (ittr->drive + L"*"));
            // argument - ittr->drive + L"*";
        }
    }
    // join
}

推荐答案

从您的代码片段中指出正确的方向并不容易.你需要一个线程对象.

From your code fragment it is not so easy to point in the right direction. You need a thread object.

using namespace System::Threading;

线程对象:

Thread ^m_Thread;

现在需要的行是:

m_Thread = gcnew Thread(gcnew ParameterizedThreadStart(this,
                    &FileIndex::Diving));
m_Thread->Start(ittr->drive + L"*");

正如 Hans Passant 在他的评论中所建议的那样.Start 方法不会像我认为的 DriverInfo 那样接受本机 c++ 值.您必须将其转换为真正的 C++/CLI 对象.Hans Passant 再次指出了正确的方向:

As Hans Passant suggest in his comment. The Start method will not accept a native c++ value like I think DriverInfo is. You have to convert it to a real C++/CLI object. And again Hans Passant point into the right direction:

ref class mywrapwstring
{
 public:
  mywrapwstring(std::wstring str) :  str(new std::wstring(str)) {}
  !mywrapwstring() :  { delete std::string(str); }
  std::wstring *str;
};

和魔法"调用:

m_Thread->Start(gcnew mywrapwstring(ittr->drive + L"*") ); 

和线程方法更好:

void FileIndex::Diving(mywrapwstring ^ data)
{
 // do smth.
 // any recursion 
 data->str; // here is your string
}

这篇关于在 C++ CLI 中将参数传递给线程的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！