如何从HWND获取窗口类名称和ID？

int GetClassName(
  HWND   hWnd,
  LPTSTR lpClassName,
  int    nMaxCount
);

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

std::string GetClassNameFromHWND(HWND hwnd) {
    std::vector<char> className(256);
    GetClassName(hwnd, &className[0], className.size());
    return std::string(className.begin(), className.end());
}

int main() {
    HWND hwnd = FindWindow(NULL, "计算器");
    std::string className = GetClassNameFromHWND(hwnd);
    std::cout << "窗口类名称："<< className<< std::endl;
    return 0;
}

LONG GetWindowLong(
  HWND hWnd,
  int  nIndex
);

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

int GetWindowIDFromHWND(HWND hwnd) {
    return GetWindowLong(hwnd, GWL_ID);
}

int main() {
    HWND hwnd = FindWindow(NULL, "计算器");
    int windowID = GetWindowIDFromHWND(hwnd);
    std::cout << "窗口ID："<< windowID<< std::endl;
    return 0;
}