Example of inter-process application monitoring using DuplicateHandle

The DuplicateHandle function is a function provided by the Windows operating system for copying handles between processes. It can be used to monitor communication between two processes, as well as facilitate data sharing and synchronization between processes.

Here is an example of implementing inter-process application monitoring using the DuplicateHandle function:

#include <windows.h>
#include <iostream>

int main()
{
    HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, 1234); // 打开目标进程
    if (hProcess == NULL)
    {
        std::cout << "Failed to open process!" << std::endl;
        return 1;
    }

    HANDLE hEvent = CreateEvent(NULL, FALSE, FALSE, "MyEvent"); // 创建一个事件对象
    if (hEvent == NULL)
    {
        std::cout << "Failed to create event!" << std::endl;
        return 1;
    }

    HANDLE hDuplicateEvent;
    if (DuplicateHandle(GetCurrentProcess(), hEvent, hProcess, &hDuplicateEvent, EVENT_ALL_ACCESS, FALSE, 0)) // 复制事件句柄到目标进程
    {
        WaitForSingleObject(hDuplicateEvent, INFINITE); // 等待事件触发
        std::cout << "Event triggered in the target process!" << std::endl;
        CloseHandle(hDuplicateEvent);
    }
    else
    {
        std::cout << "Failed to duplicate handle!" << std::endl;
        return 1;
    }

    CloseHandle(hEvent);
    CloseHandle(hProcess);
    return 0;
}

In this example, we first use the OpenProcess function to open a target process. Then we use the CreateEvent function to create an event object for communication between the two processes. Next, we use the DuplicateHandle function to copy the event handle to the target process. Then we use the WaitForSingleObject function to wait for the event to trigger, once the event triggers, the corresponding message is printed. Finally, we close the event handle and the target process handle.

It is important to note that in this example, we used hard-coded target process IDs and event names, so modifications will be needed based on specific circumstances when actually implementing it.