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我试图在一个类中创建一个线程，但出现错误。我只是想知道是否有办法解决这个问题，还是我必须int main()只在其中使用线程？

C:\windows_thread_2\windows_thread_2.cpp||In member function 'void windows_thread::thread()':|
C:\windows_thread_2\windows_thread_2.cpp|24|error: argument of type 'DWORD (windows_thread::)(void*)' does not match 'DWORD (*)(void*)'|
C:\windows_thread_2\windows_thread_2.cpp||In member function 'DWORD windows_thread::Thread_no_1(void*)':|
C:\windows_thread_2\windows_thread_2.cpp|70|warning: deprecated conversion from string constant to 'char*'|
||=== Build finished: 1 errors, 1 warnings ===|

继承人的代码。

#include <windows.h>
//#include <strsafe.h>
#include <stdio.h>

#define BUF_SIZE 255

class windows_thread
{
//-------------------------------------------------------------------
// A function to Display the message indicating in which tread we are
//-------------------------------------------------------------------
    public:

        windows_thread(){}
        ~windows_thread(){}
        void thread()
        {
            int Data_Of_Thread_1 = 1;            // Data of Thread 1
            HANDLE Handle_Of_Thread_1 = 0;       // variable to hold handle of Thread 1

            HANDLE Array_Of_Thread_Handles[1];   // Aray to store thread handles

    // Create thread 1.
            Handle_Of_Thread_1 = CreateThread( NULL, 0, Thread_no_1, &Data_Of_Thread_1, 0, NULL);
            if ( Handle_Of_Thread_1 == NULL)  ExitProcess(Data_Of_Thread_1);

    // Store Thread handles in Array of Thread Handles as per the requirement of WaitForMultipleObjects()
            Array_Of_Thread_Handles[0] = Handle_Of_Thread_1;


    // Wait until all threads have terminated.
            WaitForMultipleObjects( 1, Array_Of_Thread_Handles, TRUE, INFINITE);

            printf("Since All threads executed lets close their handles \n");

    // Close all thread handles upon completion.
            CloseHandle(Handle_Of_Thread_1);
        }
        void DisplayMessage (HANDLE hScreen, char *ThreadName, int Data, int Count)
        {
            TCHAR msgBuf[BUF_SIZE];
            size_t cchStringSize;
            DWORD dwChars;

    // Print message using thread-safe functions.
    //StringCchPrintf(msgBuf, BUF_SIZE, TEXT("Executing iteration %02d of %s having data = %02d \n"), Count, ThreadName, Data);
    //StringCchLength(msgBuf, BUF_SIZE, &cchStringSize);
            WriteConsole(hScreen, msgBuf, cchStringSize, &dwChars, NULL);
            Sleep(1000);
        }

//-------------------------------------------
// A function that represents Thread number 1
//-------------------------------------------
        DWORD WINAPI Thread_no_1( LPVOID lpParam )
        {
            int     Data = 0;
            int     count = 0;
            HANDLE  hStdout = NULL;

    // Get Handle To screen. Else how will we print?
            if( (hStdout = GetStdHandle(STD_OUTPUT_HANDLE)) == INVALID_HANDLE_VALUE )
                return 1;

    // Cast the parameter to the correct data type passed by callee i.e main() in our case.
            Data = *((int*)lpParam);

            for (count = 0; count <= 4; count++ )
            {
                DisplayMessage (hStdout, "Thread_no_1", Data, count);
            }

            return 0;
        }
};
int main()
{
    windows_thread threading;
    threading.thread();

    return 0;
}

我根据答案编辑了代码，如果你能解决这个错误，请编辑它。 line 78 error: no matching function for call to 'windows_thread::Thread_no_1()'|

#include <windows.h>
//#include <strsafe.h>
#include <stdio.h>

#define BUF_SIZE 255

class windows_thread
{
//-------------------------------------------------------------------
// A function to Display the message indicating in which tread we are
//-------------------------------------------------------------------
    public:

        windows_thread(){}
        ~windows_thread(){}
        void thread()
        {
            int Data_Of_Thread_1 = 1;            // Data of Thread 1
            HANDLE Handle_Of_Thread_1 = 0;       // variable to hold handle of Thread 1

            HANDLE Array_Of_Thread_Handles[1];   // Aray to store thread handles

    // Create thread 1.
            Handle_Of_Thread_1 = CreateThread( NULL, 0,  Wrap_Thread_no_1, &Data_Of_Thread_1, 0, NULL);
            if ( Handle_Of_Thread_1 == NULL)  ExitProcess(Data_Of_Thread_1);

    // Store Thread handles in Array of Thread Handles as per the requirement of WaitForMultipleObjects()
            Array_Of_Thread_Handles[0] = Handle_Of_Thread_1;


    // Wait until all threads have terminated.
            WaitForMultipleObjects( 1, Array_Of_Thread_Handles, TRUE, INFINITE);

            printf("Since All threads executed lets close their handles \n");

    // Close all thread handles upon completion.
            CloseHandle(Handle_Of_Thread_1);
        }
        void DisplayMessage (HANDLE hScreen, char *ThreadName, int Data, int Count)
        {
            TCHAR msgBuf[BUF_SIZE];
            size_t cchStringSize;
            DWORD dwChars;

    // Print message using thread-safe functions.
    //StringCchPrintf(msgBuf, BUF_SIZE, TEXT("Executing iteration %02d of %s having data = %02d \n"), Count, ThreadName, Data);
    //StringCchLength(msgBuf, BUF_SIZE, &cchStringSize);
            WriteConsole(hScreen, msgBuf, cchStringSize, &dwChars, NULL);
            Sleep(1000);
        }

//-------------------------------------------
// A function that represents Thread number 1
//-------------------------------------------
        DWORD WINAPI Thread_no_1( LPVOID lpParam )
        {
            int     Data = 0;
            int     count = 0;
            HANDLE  hStdout = NULL;

    // Get Handle To screen. Else how will we print?
            if( (hStdout = GetStdHandle(STD_OUTPUT_HANDLE)) == INVALID_HANDLE_VALUE )
                return 1;

    // Cast the parameter to the correct data type passed by callee i.e main() in our case.
            Data = *((int*)lpParam);

            for (count = 0; count <= 1; count++ )
            {
                //DisplayMessage (hStdout, "Thread_no_1", Data, count);
            }

            return 0;
        }
        static DWORD WINAPI Wrap_Thread_no_1( LPVOID lpParam )
        {
            windows_thread *self = reinterpret_cast<windows_thread*>(lpParam);
            self->Thread_no_1();
        }
};
int main()
{
    windows_thread threading;
    threading.thread();

    return 0;
}
4

2 回答 2

4

线程必须是“普通函数”，而不是对类的非静态成员函数的调用——这些需要“this-pointer”的额外“隐藏”参数。

由于到目前为止您的代码没有使用任何成员变量[据我所知]，因此简单的解决方案是制作函数static.

如果要使用类的成员变量或成员函数，则需要有一个静态函数并将对象 ( this) 作为参数的（部分）传递给线程，然后使用 areinterpret_cast<windows_thread*>(arg);将其转换回来。

这些方面的东西：

... 
    Handle_Of_Thread_1 = CreateThread( NULL, 0, Wrap_Thread_no_1, this, 0, NULL);

... 

    static DWORD WINAPI Wrap_Thread_no_1( LPVOID lpParam )
    {
          windows_thread *self = reinterpret_cast<windows_thread*>(lpParam);
          self->Thread_no_1();
    }

我已经删除了你原来的论点。假设线程每个对象只运行一个线程，您可以将其设为成员变量。如果您需要具有单独参数的多个线程，那么您需要将传入的参数设置为 a structor class，然后reinterpret_cast将this指针存储为structor class[这可能windows_thread*不需要强制转换]的一部分。

于 2013-03-04T00:29:09.363 回答
3

您正在尝试将指向成员的指针传递给线程，这与此处的原始指针不同。它需要一个对象附加到它上面。

Handle_Of_Thread_1 = CreateThread( NULL, 0, Thread_no_1, &Data_Of_Thread_1, 0, NULL);

static通过改变这个来制作函数：

    DWORD WINAPI Thread_no_1( LPVOID lpParam )

对此：

    static DWORD WINAPI Thread_no_1( LPVOID lpParam )

...它（正确地）声明此功能不需要this.

于 2013-03-04T00:26:58.180 回答