`NUMBERFMT`和`GetNumberFormatEx`的正确使用方法是什么？

typedef struct _NUMBERFMT {
  LCID   NumFmtID;
  WCHAR  LeadingZero;
  WCHAR  Grouping;
  WCHAR  DecimalSep;
  WCHAR  ThousandSep;
  ULONG  NegativeOrder;
  ULONG  PositiveOrder;
  WCHAR  CurrencySymbol[5];
} NUMBERFMT;

int GetNumberFormatEx(
  LPCWSTR lpLocaleName,
  DWORD   dwFlags,
  LPCWSTR lpValue,
  const NUMBERFMT *lpFormat,
  LPWSTR  lpNumberStr,
  int     cchNumber
);

#include <windows.h>
#include <stdio.h>

int main() {
    WCHAR numberStr[50];
    NUMBERFMT fmt;
    LCID locale = MAKELCID(MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED), SORT_DEFAULT);

    // 初始化NUMBERFMT结构体
    fmt.NumFmtID = locale;
    fmt.LeadingZero = 0;
    fmt.Grouping = 3; // 使用千位分隔符
    fmt.DecimalSep = L'.';
    fmt.ThousandSep = L',';
    fmt.NegativeOrder = 0;
    fmt.PositiveOrder = 0;
    wcscpy_s(fmt.CurrencySymbol, L"¥");

    // 格式化数字
    double number = 1234567.89;
    int result = GetNumberFormatEx(L"zh-CN", 0, L"1234567.89", &fmt, numberStr, 50);

    if (result > 0) {
        wprintf(L"Formatted number: %s\n", numberStr);
    } else {
        printf("Error formatting number: %d\n", GetLastError());
    }

    return 0;
}