DuplicateHandle 伪句柄与实句柄的应用

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如果把GetCurrentThread()返回值传递给一个HANDLE句柄，用它进行ResumeThread,结果肯定不是我们想要的。下面的例子详细描述了伪句柄的调用结果：

#include "stdafx.h" #include <stdio.h> #include <iostream> #include <windows.h> #include <process.h> using namespace std; #pragma warning(disable:4996) HANDLE hThread = NULL; unsigned int __stdcall ProcessInfo(void* lp) { string str = *(string*)lp; delete lp; hThread = GetCurrentThread(); while(true){ SuspendThread(GetCurrentThread()); cout<<str.c_str()<<endl; } _endthreadex(0); return 0; } int _tmain() { string *pStr = new string; *pStr = "老婆, I Love You"; unsigned int dwThreadID; SECURITY_ATTRIBUTES sa; sa.bInheritHandle = FALSE; sa.lpSecurityDescriptor = NULL; sa.nLength = sizeof(SECURITY_ATTRIBUTES); HANDLE hCom = (HANDLE)_beginthreadex(&sa, 0, ProcessInfo, (void*)pStr, 0, &dwThreadID); Sleep(1000);//线程肯定会先执行到SuspendThread，主线程一直在延时，并且全局hThread得到线程的伪句柄ResumeThread(hThread); printf("hThread的句柄值是： %d\n", hThread); Sleep(INFINITE); CloseHandle(hCom); return 0; }

结果显示,hThread是-2，线程没有输出任何东西

修改代码如下：

#include "stdafx.h" #include <stdio.h> #include <iostream> #include <windows.h> #include <process.h> using namespace std; #pragma warning(disable:4996) HANDLE hThread = NULL; unsigned int __stdcall ProcessInfo(void* lp) { string str = *(string*)lp; delete lp; DuplicateHandle(GetCurrentProcess(), GetCurrentThread(), GetCurrentProcess(), &hThread, 0, 0, DUPLICATE_SAME_ACCESS); while(true){ SuspendThread(GetCurrentThread()); cout<<str.c_str()<<endl; } _endthreadex(0); return 0; } int _tmain() { string *pStr = new string; *pStr = "老婆, I Love You"; unsigned int dwThreadID; SECURITY_ATTRIBUTES sa; sa.bInheritHandle = FALSE; sa.lpSecurityDescriptor = NULL; sa.nLength = sizeof(SECURITY_ATTRIBUTES); HANDLE hCom = (HANDLE)_beginthreadex(&sa, 0, ProcessInfo, (void*)pStr, 0, &dwThreadID); Sleep(1000);//线程肯定会先执行到SuspendThread，主线程一直在延时，并且全局hThread得到线程的伪句柄ResumeThread(hThread); printf("hThread的句柄值是： %d\n", hThread); Sleep(INFINITE); CloseHandle(hCom); return 0; }

运行正常

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DuplicateHandle 伪句柄 与 实句柄的应用

DuplicateHandle 伪句柄与实句柄的应用