将 std::thread 转换为 HANDLE 以调用 TerminateThread() [重复]

Question

是否可以将 C++ 中的 std::thread 线程转换或转换为 Windows 中的 HANDLE？ 我一直在尝试使用线程的 WINAPI 函数来管理 Windows 中的线程，但我无法让它工作......

#include <thread>
#include <string>
#include <iostream>
#include <windows.h>

void Hi(std::string n){
while(true){
    std::cout<<"Hi :3 "<<n<<"\n";
    std::this_thread::sleep_for(std::chrono::seconds(1));
}
}

int main(void){

std::thread first(Hi, "zoditu");

first.detach();
getc(stdin);

//SuspendThread((void*)first.native_handle());
TerminateThread((void*)first.native_handle(), (unsigned long)0x00);
CloseHandle((void*)first.native_handle());

std::cout<<"No D:!!\n";
getc(stdin);

return 0;
}

但似乎什么也没做，因为线程一直在控制台中产生“Hi's”......有没有办法使用 WINAPI “杀死”它？

Answer 1

我不认为将std::thread::native_handle()返回的值直接用于Win32 API函数有什么问题（即不需要转换）。

以下程序适合我。 然而，如果线程在主动执行时被终止，它通常（总是？）崩溃，但如果线程在终止之前被挂起，它就可以正常工作。正如您所知道的和其他人所指出的，终止线程通常不是一个好主意。

但回答您的问题 Win32 API 似乎可以按预期工作而无需任何额外的转换。以下程序适用于我。

程序：

#include <windows.h>

#include <iostream>
#include <string>
#include <thread>

void foo()
{
    while (true)
    {
        std::cout << "foo()\n";
        std::this_thread::sleep_for(std::chrono::seconds(1));
    }
}

int main(void)
{
    std::thread first(foo);

    bool isFinished = false;
    while (!isFinished)
    {
        char ch = ::getchar();
        ::getchar(); // Swallow the new line character

        if (ch == 'e')
        {
            isFinished = true;
        }
        else if (ch == 's')
        {
            DWORD result = ::SuspendThread(first.native_handle());
            if (result != -1)
            {
                std::cout << "Successfully suspended thread\n";
            }
            else
            {
                std::cout << "Failed to suspend thread: failure resson " << ::GetLastError() << "\n";
            }
        }
        else if (ch == 'r')
        {
            DWORD result = ::ResumeThread(first.native_handle());
            if (result != -1)
            {
                std::cout << "Successfully resumed thread\n";
            }
            else
            {
                std::cout << "Failed to resume thread: failure resson " << ::GetLastError() << "\n";
            }
        }
        else if (ch == 'k')
        {
            DWORD result = ::TerminateThread(first.native_handle(), 1);
            if (result != 0)
            {
                std::cout << "Successfully terminated thread\n";
            }
            else
            {
                std::cout << "Failed to terminate thread: failure resson " << ::GetLastError() << "\n";
            }
        }
        else
        {
            std::cout << "Unhandled char '" << ch << "'\n";
        }
    }

    first.detach();

    std::cout << "waiting to exit main...";
    ::getchar();
    std::cout << "exiting...\n";

    return 0;
}

样本输出（我添加的cmets）：

foo()
foo()
foo()
foo()
s
Successfully suspended thread // This was successful since 'foo()' is no longer printing
r
Successfully resumed thread // This was successful since 'foo()' is again printing
foo()
foo()
foo()
foo()
s
Successfully suspended thread // Worked again
k
Successfully terminated thread // Says it works...
r
Successfully resumed thread // Termination must have worked because resuming did not cause 'foo' to start printing
e
waiting to exit main...
exiting...