软件在线升级-空中下载技术(下-实操篇)
软件在线升级
基于 C++/CLR 的软件在线升级操作指南
一、创建 Visual Studio 2022 工程
- 打开 Visual Studio 2022,点击 “创建新项目”。
- 在模板搜索框中输入 “C++/CLR”,选择 “CLR 空项目”,点击 “下一步”。
- 输入项目名称和保存位置,点击 “创建”,完成基础工程搭建。
二、配置 AWS S3 桶
{
"version": "2.1.0",
"releaseDate": "2024-10-25",
"updateType": "major",
"changelog": [
{
"type": "security",
"title": "修复远程代码执行漏洞",
"description": "解决了CVE-2024-12345漏洞,该漏洞允许攻击者通过恶意文件触发缓冲区溢出"
},
{
"type": "feature",
"title": "新增多语言支持",
"description": "支持英语、中文、日语三种界面语言,可在设置中切换"
},
{
"type": "improvement",
"title": "性能优化",
"description": "文件加载速度提升40%,内存占用降低25%"
}
],
"upgradeTips": [
"建议在Wi-Fi环境下进行更新",
"更新前请备份重要数据"
],
"downloadUrl":"https://xxxxx.mis"
}
三、实现版本检测功能
在项目中添加一个新的头文件VersionChecker.h和源文件VersionChecker.cpp 。
VersionChecker.h 内容
#pragma once
#include <string>
#include <curl/curl.h>
namespace UpdateChecker {
std::string GetRemoteVersion(const std::string& url);
}
VersionChecker.cpp 内容
#include "VersionChecker.h"
#include <iostream>
std::string UpdateChecker::GetRemoteVersion(const std::string& url) {
CURL* curl = curl_easy_init();
std::string response;
if (curl) {
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, [](void* contents, size_t size, size_t nmemb, void* userp) -> size_t {
((std::string*)userp)->append((char*)contents, size * nmemb);
return size * nmemb;
});
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);
CURLcode res = curl_easy_perform(curl);
if (res != CURLE_OK) {
std::cerr << "curl_easy_perform() failed: " << curl_easy_strerror(res) << std::endl;
}
curl_easy_cleanup(curl);
}
return response;
}
在主程序中调用该函数检测版本,假设服务器返回的版本号存储在https://your-bucket-name.s3.amazonaws.com/version.txt:
#include "VersionChecker.h"
#include <iostream>
int main() {
std::string remoteVersion = UpdateChecker::GetRemoteVersion("https://your-bucket-name.s3.amazonaws.com/version.txt");
std::string localVersion = "1.0.0"; // 假设本地版本号
if (remoteVersion > localVersion) {
std::cout << "有可用更新!" << std::endl;
}
else {
std::cout << "当前为最新版本" << std::endl;
}
return 0;
}
四、使用 HTTP Range 实现断点续传下载
添加Downloader.h和Downloader.cpp文件。
Downloader.h 内容
#pragma once
#include <string>
#include <curl/curl.h>
#include <fstream>
namespace Downloader {
bool DownloadFile(const std::string& url, const std::string& localFilePath, const long long resumeByte = 0);
}
Downloader.cpp 内容
#include "Downloader.h"
#include <iostream>
bool Downloader::DownloadFile(const std::string& url, const std::string& localFilePath, const long long resumeByte) {
CURL* curl = curl_easy_init();
std::ofstream outFile(localFilePath, std::ios::binary | (resumeByte > 0 ? std::ios::app : std::ios::trunc));
if (curl && outFile) {
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, [](void* contents, size_t size, size_t nmemb, void* userp) -> size_t {
((std::ofstream*)userp)->write((char*)contents, size * nmemb);
return size * nmemb;
});
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &outFile);
if (resumeByte > 0) {
char rangeHeader[100];
snprintf(rangeHeader, sizeof(rangeHeader), "Range: bytes=%lld-", resumeByte);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, curl_slist_append(nullptr, rangeHeader));
}
CURLcode res = curl_easy_perform(curl);
if (res != CURLE_OK) {
std::cerr << "curl_easy_perform() failed: " << curl_easy_strerror(res) << std::endl;
outFile.close();
curl_easy_cleanup(curl);
return false;
}
outFile.close();
curl_easy_cleanup(curl);
return true;
}
if (curl) {
curl_easy_cleanup(curl);
}
if (outFile) {
outFile.close();
}
return false;
}
在检测到有更新时调用下载函数:
#include "VersionChecker.h"
#include "Downloader.h"
#include <iostream>
int main() {
std::string remoteVersion = UpdateChecker::GetRemoteVersion("https://your-bucket-name.s3.amazonaws.com/version.txt");
std::string localVersion = "1.0.0";
if (remoteVersion > localVersion) {
std::cout << "有可用更新!开始下载..." << std::endl;
std::string updateUrl = "https://your-bucket-name.s3.amazonaws.com/updates/your_update_file.exe";
std::string localFilePath = "C:\\temp\\your_update_file.exe";
if (Downloader::DownloadFile(updateUrl, localFilePath)) {
std::cout << "下载完成" << std::endl;
}
}
else {
std::cout << "当前为最新版本" << std::endl;
}
return 0;
}
五、使用 Microsoft Visual Studio Installer Projects 2022 打包升级程序
六、后续处理与优化

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