#include <iostream>

#include <wchar.h>

#include <windows.h>

using namespace std;

 

 

int main()

{

	//多字节转换宽字节

	char * ptr = "测试123";

	cout << "strlen(ptr)= " << strlen(ptr) <<endl;//返回7=2+2+1+1+1

	//计算转换后需要的字节数

	int len1 = MultiByteToWideChar(CP_ACP, 0, ptr, -1, NULL, 0); 

	cout << "len1: " << len1 << endl;//返回6=5个字符+1个结束符

	//转换

	wchar_t * pwtr = new wchar_t[len1];

	int len2 = MultiByteToWideChar(CP_ACP, 0, ptr, -1, pwtr, len1);

	cout << "len2: " << len2 <<endl;//返回6 同上

	cout << "wcslen(pwtr): " << wcslen(pwtr) <<endl;//返回5=5个字符

	setlocale(LC_ALL,"chs");

	cout << "pwtr: ";

	wcout << pwtr << endl;

	if (pwtr != NULL)

	{

		delete [] pwtr;

		pwtr = NULL;

		cout << "pwtr has been deleted!" <<endl;

	}

 

	//宽字符转多字节

	wchar_t pwtr1[10] = L"123测试";

	cout << "wcslen(pwtr1): " << wcslen(pwtr1) << endl;//返回5=1+1+1+1+1

	//计算转换后需要的字节数

	int len3 = WideCharToMultiByte(CP_ACP, 0, pwtr1, -1, NULL, 0, NULL, NULL);

	cout << "len3: " << len3 <<endl;//返回8=1+1+1+2+2+1

	//转换 

	char * ptr1 = new char[len3];

	int len4 = WideCharToMultiByte(CP_ACP, 0 ,pwtr1, -1 , ptr1, len3, NULL, NULL);

	cout << "len4: " << len4 << endl;//返回8 同上 

	cout << "strlen(ptr1): " << strlen(ptr1) << endl;//返回7 不包含结束符

	cout << "ptr1: " << ptr1 <<endl;//输出"123测试"

	if (ptr1 != NULL)

	{

		delete [] ptr1;

		pwtr = NULL;

		cout << "ptr1 has been deleted!" <<endl;

	}

	

 

	return 0;

}

经过两个函数之后的字符串没有结束符。