Windows核心编程：第3章 内核对象

Github

https://github.com/gongluck/Windows-Core-Program.git

//第3章 内核对象.cpp: 定义应用程序的入口点。
//

#include "stdafx.h"
#include "第3章 内核对象.h"

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPWSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{
    SECURITY_ATTRIBUTES sa = { 0 };
    sa.nLength = sizeof(sa);
    sa.lpSecurityDescriptor = nullptr;
    sa.bInheritHandle = TRUE;//可被继承
    HANDLE hMutex = CreateMutex(&sa, FALSE, nullptr);
    SetHandleInformation(hMutex, HANDLE_FLAG_INHERIT, 0);//关闭可继承
    SetHandleInformation(hMutex, HANDLE_FLAG_INHERIT, HANDLE_FLAG_INHERIT);//打开可继承

    HANDLE hMutex2 = CreateMutex(nullptr, FALSE, TEXT("有名的Mutex"));
    DWORD err = GetLastError();
    if (err == ERROR_ALREADY_EXISTS)
        MessageBox(NULL, TEXT("打开了已经创建的Mutex"), TEXT("CreateMutex"), MB_OK);
    else
        MessageBox(NULL, TEXT("创建了新的的Mutex"), TEXT("CreateMutex"), MB_OK);

    HANDLE hMutex3 = OpenMutex(MUTEX_ALL_ACCESS, TRUE, TEXT("有名的Mutex"));

    //灵活的(跨进程)句柄复制
    HANDLE hMutex4 = nullptr;
    DuplicateHandle(GetCurrentProcess(), hMutex, GetCurrentProcess(), &hMutex4, 0, FALSE, DUPLICATE_SAME_ACCESS);

    CloseHandle(hMutex);//调用CloseHandle后，句柄表中的对应值就被重置了，hMutex不会指向原来的内核对象(无论此时引用计数是否为0)
    hMutex = nullptr;//良好的习惯
    CloseHandle(hMutex2);
    hMutex2 = nullptr;
    CloseHandle(hMutex3);
    hMutex3 = nullptr;
    CloseHandle(hMutex4);
    hMutex4 = nullptr;
    system("pause");
    return 0;
}