你如何使用CreateThread作为类成员的函数？

你如何使用CreateThread()来创build类成员函数的线程？

Answer 1

您需要创build一个静态方法作为实际的线程启动函数，并将一个指向实例的指针作为CreateThread的lpParameter参数。 这将被传递给静态方法，该方法可以将其转换为对象指针并调用成员函数。

 class MyClass { static DWORD WINAPI StaticThreadStart(void* Param) { MyClass* This = (MyClass*) Param; return This->ThreadStart(); } DWORD ThreadStart(void) { // Do stuff } void startMyThread() { DWORD ThreadID; CreateThread(NULL, 0, StaticThreadStart, (void*) this, 0, &ThreadID); } }; 

Answer 2

其他遇到的人可能想要使用我的解决scheme。 这是一个用VS2008编译的完整的源文件。 请参阅下面的简短说明如何使用！

 // Thread.h #ifndef __THREAD_H__ #define __THREAD_H__ // ############################################################################# #define WIN32_LEAN_AND_MEAN #include <Windows.h> // ============================================================================= template<class T> class Thread { // new type Method: pointer to a object's method (this call) typedef DWORD (T::* Method)(void); // ----------------------------------------------------------------------------- protected: HANDLE hThread; // unique handle to the thread private: DWORD threadID; // thread id - 0 until started T* object; // the object which owns the method Method method; // the method of the object HANDLE hInterrupt; // mutex to signal an interrupt via ReleaseSemaphore() HANDLE hSingleStart; // only one thread allowed to call start() mutex // ----------------------------------------------------------------------------- private: // This function gets executed by a concurrent thread. static DWORD run(LPVOID thread_obj) { Thread<T>* thread = (Thread<T>*)thread_obj; return (thread->object->*thread->method) (); } // Prevent copying of threads: No sensible implementation! Thread(const Thread<T>& other) {} // Prevent assignment of threads: No sensible implementation! Thread<T>& operator =(const Thread<T>& other) {} // ----------------------------------------------------------------------------- public: /* Creates a new Thread object. object: the one which method should be executed. method: pointer to the object's method. */ explicit Thread(T* object, DWORD ( T::* method)(void)) { this->hThread = NULL; this->object = object; this->method = method; this->threadID = 0; this->hInterrupt = CreateSemaphore(NULL, 1, 1, NULL); this->hSingleStart = CreateMutex(NULL, FALSE, NULL); // this->hInterrupt = CreateMutex(NULL, FALSE, NULL); } // ----------------------------------------------------------------------------- ~Thread(void) { if (hInterrupt) CloseHandle(hInterrupt); if (hThread) CloseHandle(hThread); } // ----------------------------------------------------------------------------- /* Starts executing the objects method in a concurrent thread. True if the thread was started successfully; otherwise false. */ bool start() { __try { if (WaitForSingleObject(hSingleStart, 0) != WAIT_OBJECT_0) return false; if (hThread) // Thread had been started sometime in the past { if (WaitForSingleObject(hThread, 0) == WAIT_TIMEOUT) { // if thread's still running deny new start return false; } CloseHandle(hThread); } // (Re-)Set not interrupted semaphore state WaitForSingleObject(hInterrupt, 0); hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE) Thread<T>::run, this, 0, &this->threadID ); if (hThread) return true; return false; } __finally { ReleaseMutex(hSingleStart); } } // ----------------------------------------------------------------------------- // Blocks the calling thread until this thread has stopped. inline void join() { WaitForSingleObject(hThread, INFINITE); } // ----------------------------------------------------------------------------- /* Asks the thread to exit nicely. Thread function must implement checks. return value indicates if the interrupt could be placed not if the thread reacts on the interrupt. true indicates success, false an error. */ inline bool interrupt() { if (hInterrupt) { return ((ReleaseSemaphore(hInterrupt, 1, NULL) == FALSE) ? false : true); } return false; } // ----------------------------------------------------------------------------- /* True if an interrupt request was set, otherwise false. */ inline bool isInterrupted() { return this->isInterrupted(0); } // ----------------------------------------------------------------------------- /* True if an interrupt request was set, otherwise false. Waits for millisec milliseconds for the interrupt to take place. */ inline bool isInterrupted(DWORD millisec) { if (WaitForSingleObject(hInterrupt, millisec) == WAIT_TIMEOUT) { return false; } ReleaseSemaphore(hInterrupt, 1, NULL); // keep interrupted state return true; } // ----------------------------------------------------------------------------- inline bool isRunning() { DWORD exitCode = 0; if (hThread) GetExitCodeThread(hThread, &exitCode); if (exitCode == STILL_ACTIVE) return true; return false; } // ----------------------------------------------------------------------------- // Getter & Setter // ----------------------------------------------------------------------------- __declspec(property(get = getThreadHandle)) HANDLE ThreadHandle; inline HANDLE getThreadHandle() { return hThread; } // ----------------------------------------------------------------------------- __declspec(property(get = getThreadID)) DWORD ThreadID; inline DWORD getThreadID() { return threadID; } // ----------------------------------------------------------------------------- }; // ############################################################################# #endif // __THREAD_H__ 

简短的例子：

 // main.cpp #include <iostream> #include <string> #include "Thread.h" class HelloWorld { public: DWORD print () { std::cout << "Hello World!" << std::endl; return 0; } }; int main(void) { // Random object with DWORD method (void) HelloWorld world; // thread should call print method of world. Thread<HelloWorld> thread(&world, &HelloWorld::print); if (thread.start()) std::cout << "Thread start()" << std::endl; thread.join(); // wait for thread return 0; }