C++ 设置Java 环境变量

#include <iostream>
#include <cstdio> 
#include <stdlib.h>
#include <conio.h>
#include <string>
#define _AFXDLL
#include <afxwin.h>
#include <tchar.h>  
#include <afx.h>
#include <afxpriv.h>
using namespace std ;

void main(void)
{
    char plusPath[] = ";C:\\software\\develop\\eclipse49\\plus\\jdk1.8.0_191\\bin";
    HKEY hKey;
    char data[1024] = {};
    DWORD dwSize = sizeof(data);
    DWORD dwType = REG_EXPAND_SZ;

    // HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment
    const char *key = "System\\CurrentControlSet\\Control\\Session Manager\\Environment";
    RegOpenKeyEx(HKEY_LOCAL_MACHINE, key, 0, KEY_READ|KEY_WRITE, &hKey);
    RegQueryValueExA(hKey, "Path", NULL, &dwType, (LPBYTE)data, &dwSize);
    int length=strlen(plusPath) + strlen(data);
    char *environment = new char[length];
    environment=strcat(data,plusPath);
    RegSetValueExA(hKey, "Path", NULL, REG_EXPAND_SZ, (const unsigned char *)environment, strlen(environment));
    DWORD dwResult; 
    SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE , 0,LPARAM(_T("Environment")), SMTO_ABORTIFHUNG, 5000, &dwResult);
    RegCloseKey(hKey);
}