帮我用c++实现一个Minecraft启动器在不用MinecraftLauncher.exe的前提下

好的，以下是一个简单的C++实现Minecraft启动器的示例代码，它不需要使用Minecraft Launcher.exe文件：

#include <iostream>
#include <fstream>
#include <string>
#include <windows.h>
#include <vector>
#include <algorithm>

using namespace std;

vector<string> splitString(const string& str, const string& delim)
{
    vector<string> result;
    size_t last = 0;
    size_t index = str.find_first_of(delim, last);
    while (index != string::npos) {
        result.push_back(str.substr(last, index - last));
        last = index + 1;
        index = str.find_first_of(delim, last);
    }
    if (index - last > 0) {
        result.push_back(str.substr(last, index - last));
    }
    return result;
}

int main()
{
    // 设置Minecraft的路径和版本号
    string mcPath = "C:/Program Files (x86)/Minecraft/";
    string version = "1.16.5";

    // 读取Minecraft的启动命令
    ifstream cmdFile(mcPath + "versions/" + version + "/" + version + ".json");
    string cmd;
    while (cmdFile >> cmd) {
        if (cmd == "\"minecraftArguments\":") {
            getline(cmdFile, cmd);
            break;
        }
    }
    cmdFile.close();

    // 构造启动命令
    vector<string> cmdParts = splitString(cmd, " ");
    cmdParts.insert(cmdParts.begin(), mcPath + "runtime/jre-x64/bin/java.exe");
    cmdParts.insert(cmdParts.begin(), "-XX:+UnlockExperimentalVMOptions");
    cmdParts.insert(cmdParts.begin(), "-XX:+UseG1GC");
    cmdParts.insert(cmdParts.begin(), "-XX:G1NewSizePercent=20");
    cmdParts.insert(cmdParts.begin(), "-XX:G1ReservePercent=20");
    cmdParts.insert(cmdParts.begin(), "-XX:MaxGCPauseMillis=50");
    cmdParts.insert(cmdParts.begin(), "-XX:-UseAdaptiveSizePolicy");
    cmdParts.insert(cmdParts.begin(), "-Xmx2G");
    cmdParts.insert(cmdParts.begin(), "-Djava.library.path=" + mcPath + "versions/" + version + "/" + version + "-natives");
    cmdParts.insert(cmdParts.begin(), "-cp");
    cmdParts.insert(cmdParts.begin(), mcPath + "versions/" + version + "/" + version + ".jar");
    string fullCmd = "";
    for (string part : cmdParts) {
        fullCmd += part + " ";
    }

    // 启动Minecraft
    STARTUPINFO si = { 0 };
    si.cb = sizeof(si);
    PROCESS_INFORMATION pi;
    if (CreateProcess(NULL, (char*)fullCmd.c_str(), NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi)) {
        WaitForSingleObject(pi.hProcess, INFINITE);
        CloseHandle(pi.hProcess);
        CloseHandle(pi.hThread);
    }

    return 0;
}

这个示例代码会读取Minecraft的启动命令，然后构造启动Minecraft的命令，并通过CreateProcess函数启动Minecraft。请注意，这个示例代码仅供参考，可能需要根据实际情况进行修改。