如何使用进程ID获取Excel实例或Excel实例CLSID？

#include<Windows.h>
#include<iostream>

// 获取Excel实例
HWND GetExcelHwnd(DWORD dwProcessID)
{
    HWND hwnd = NULL;
    while ((hwnd = FindWindowEx(NULL, hwnd, L"XLMAIN", NULL)) != NULL)
    {
        DWORD dwPID = 0;
        GetWindowThreadProcessId(hwnd, &dwPID);
        if (dwPID == dwProcessID)
            return hwnd;
    }
    return NULL;
}

// 获取Excel实例CLSID
bool GetExcelCLSID(DWORD dwProcessID, CLSID& clsid)
{
    HWND hwnd = GetExcelHwnd(dwProcessID);
    if (hwnd == NULL)
        return false;

    LONG_PTR hwndExcel = GetClassLongPtr(hwnd, GCLP_HICON);
    if (hwndExcel == 0)
        return false;

    clsid.Data1 = (DWORD)((hwndExcel >> 32) & 0xFFFFFFFF);
    clsid.Data2 = (WORD)(hwndExcel & 0xFFFF);
    clsid.Data3 = (WORD)((hwndExcel >> 16) & 0xFFFF);
    clsid.Data4[0] = (BYTE)((hwndExcel >> 48) & 0xFF);
    clsid.Data4[1] = (BYTE)((hwndExcel >> 56) & 0xFF);
    clsid.Data4[2] = (BYTE)((hwndExcel >> 32) & 0xFF);
    clsid.Data4[3] = (BYTE)((hwndExcel >> 40) & 0xFF);
    clsid.Data4[4] = (BYTE)((hwndExcel >> 48) & 0xFF);
    clsid.Data4[5] = (BYTE)((hwndExcel >> 56) & 0xFF);
    clsid.Data4[6] = (BYTE)((hwndExcel >> 32) & 0xFF);
    clsid.Data4[7] = (BYTE)((hwndExcel >> 40) & 0xFF);

    return true;
}

int main()
{
    DWORD dwProcessID = 0;
    std::cout << "请输入Excel进程ID：";
    std::cin >> dwProcessID;

    CLSID clsid;
    if (GetExcelCLSID(dwProcessID, clsid))
    {
        std::cout << "Excel实例CLSID："<< std::hex << clsid.Data1 << "-"<< std::hex << clsid.Data2 << "-"<< std::hex << clsid.Data3 << "-"<< std::hex << (clsid.Data4[0] << 8 | clsid.Data4[1]) << "-"<< std::hex << (clsid.Data4[2] << 24 | clsid.Data4[3] << 16 | clsid.Data4[4] << 8 | clsid.Data4[5])<< std::endl;
    }
    else
    {
        std::cout << "无法获取Excel实例CLSID。"<< std::endl;
    }

    return 0;
}