Windows核心編程：第3章 內核對象

Github

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

//第3章 內核對象.cpp: 定義應用程序的入口點。
//

#include "stdafx.h"
#include "第3章 內核對象.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;//可被繼承
    HANDLE hMutex = CreateMutex(&sa, FALSE, nullptr);
    SetHandleInformation(hMutex, HANDLE_FLAG_INHERIT, 0);//關閉可繼承
    SetHandleInformation(hMutex, HANDLE_FLAG_INHERIT, HANDLE_FLAG_INHERIT);//打開可繼承

    HANDLE hMutex2 = CreateMutex(nullptr, FALSE, TEXT("有名的Mutex"));
    DWORD err = GetLastError();
    if (err == ERROR_ALREADY_EXISTS)
        MessageBox(NULL, TEXT("打開了已經建立的Mutex"), TEXT("CreateMutex"), MB_OK);
    else
        MessageBox(NULL, TEXT("建立了新的的Mutex"), TEXT("CreateMutex"), MB_OK);

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

    //靈活的(跨進程)句柄複製
    HANDLE hMutex4 = nullptr;
    DuplicateHandle(GetCurrentProcess(), hMutex, GetCurrentProcess(), &hMutex4, 0, FALSE, DUPLICATE_SAME_ACCESS);

    CloseHandle(hMutex);//調用CloseHandle後，句柄表中的對應值就被重置了，hMutex不會指向原來的內核對象(不管此時引用計數是否爲0)
    hMutex = nullptr;//良好的習慣
    CloseHandle(hMutex2);
    hMutex2 = nullptr;
    CloseHandle(hMutex3);
    hMutex3 = nullptr;
    CloseHandle(hMutex4);
    hMutex4 = nullptr;
    system("pause");
    return 0;
}