// iniconfig.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <windows.h>
#include <string>
#include <iostream>
#include <sstream>
using namespace std;

std::string & std_string_format(std::string & _str, const char * _Format, ...) 
{
	std::string tmp;

	va_list marker = NULL;
	va_start(marker, _Format);

	size_t num_of_chars = _vscprintf(_Format, marker);

	if (num_of_chars > tmp.capacity()) {
		tmp.resize(num_of_chars + 1);
	}

	vsprintf_s((char *)tmp.data(), tmp.capacity(), _Format, marker);

	va_end(marker);

	_str = tmp.c_str();
	return _str;
}

std::wstring & std_wstring_format(std::wstring & _str, const wchar_t * _Format, ...)
{
	std::wstring tmp;

	va_list marker = NULL;
	va_start(marker, _Format);

	size_t num_of_chars = _vscwprintf(_Format, marker);

	if (num_of_chars > tmp.capacity()) {
		tmp.resize(num_of_chars + 1);
	}

	vswprintf_s((wchar_t *)tmp.data(), tmp.capacity(), _Format, marker);

	va_end(marker);

	_str = tmp.c_str();
	return _str;
}

int main()
{
	int num = 1234;
	double dnum = 8832.234;
	string strResult;
	string format = "the num is %d,the dnum is %f";
	string ret = std_string_format(strResult, format.c_str(), num, dnum);
	wstring strResult2;
	wstring format2 = L"the num is %d,the dnum is %f";
	wstring ret2 = std_wstring_format(strResult2, format2.c_str(), num, dnum);
	//使用ostringstream格式化字符串
	ostringstream ss;
	ss << "the num is " << num << ",the dnum is " << dnum;
	string strResult3 = ss.str();

	wstringstream ws;
	ws << L"the num is " << num << L",the dnum is " << dnum;
	wstring strResult4 = ws.str();
    return 0;
}