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@cordova-ohos/cordova-plugin-file-md5

v0.3.3

Published

Cordova file md5 Plugin

Readme

cordova-plugin-file-md5 高效文件MD5计算插件

一款专为 Cordova/PhoneGap 混合移动应用设计的文件MD5值计算插件,基于原生平台API实现,支持本地文件、assets目录文件及远程文件(下载后计算)的MD5哈希值计算,具备计算速度快、内存占用低、跨平台兼容等特点。可广泛应用于文件完整性校验、文件唯一标识生成、断点续传校验、缓存文件管理等场景。

安装方法

确保已创建 Cordova 项目(若未创建,执行 cordova create fileMd5App com.example.filemd5app FileMd5App 创建),进入项目根目录后选择以下方式安装:

1. 基础版安装

适用于大多数场景,直接从 npm 仓库安装稳定版:


# 安装hcordova
npm install -g hcordova

# 安装最新稳定版 MD5 插件
hcordova plugin add cordova-plugin-file-md5

# 安装指定版本(示例:1.0.0 版本)
hcordova plugin add [email protected] --platform ohos

2. 从 GitCode 安装开发版

适用于需要体验最新功能的开发者,从 GitHub 仓库直接安装:


# 安装开发版插件
hcordova plugin add https://gitcode.com/OpenHarmony-Cordova/cordova-plugin-file-md5.git --platform ohos

4. 安装后验证

安装完成后,可通过以下命令验证插件是否安装成功:


# 查看已安装的插件列表
hcordova plugin list

# 若列表中显示 cordova-plugin-file-md5 则安装成功

卸载方法

进入项目根目录,执行以下命令卸载插件,若需同时卸载依赖插件可一并执行:


# 全平台卸载
hcordova plugin remove cordova-plugin-file-md5

# 指定OHOS卸载
hcordova plugin remove cordova-plugin-file-md5  --platform ohos

API 参考

计算本地存储(沙盒/外部存储)文件的 MD5 值,支持进度回调。


function win(md5sum){
    console.log("MD5SUM: " + md5sum);
}
function fail(error){
    console.log("Error-Message: " + error);
}
md5chksum.file(fileEntry, win, fail);

API 使用示例

下载文件、计算md5值


function fileMd5() {
    function writeFile(fileEntry, dataObj, isAppend) {
        fileEntry.createWriter(function (fileWriter) {
            fileWriter.onwriteend = function() {
                console.log("Successful file write...");
                md5chksum.file(fileEntry, function(md5Value){
                    document.getElementById("md5Value").innerHTML = md5Value;
                }, function(errorInfo){
                    document.getElementById("md5Value").innerHTML = errorInfo;
                });
            };
            fileWriter.onerror = function(e) {
                console.log("Failed file write: " + e.toString());
            };
            fileWriter.write(dataObj);
        });
    }

    function saveFile(dirEntry, fileData, fileName) {
        dirEntry.getFile(fileName, { create: true, exclusive: false }, function (fileEntry) {
            writeFile(fileEntry, fileData);
        }, function(){
            return;
        });
    }

    function getSampleFile(dirEntry) {
        var xhr = new XMLHttpRequest();
        xhr.open('GET', 'https://cordova.apache.org/static/img/cordova_bot.png', true);
        xhr.responseType = 'blob';

        xhr.onload = function() {
            if (this.status == 200) {
                var blob = new Blob([this.response], { type: 'image/png' });
                saveFile(dirEntry, blob, "downloadedImage.png");
            }
        };
        xhr.send();
    }

    window.resolveLocalFileSystemURL(cordova.file.cacheDirectory, function(dirEntry) {
        document.getElementById("md5Value").innerHTML = "正在下载...";
        dirEntry.getDirectory("magongshou/import", {create: true}, function (dir) {
            getSampleFile(dir);
        },
        function(){
            return;
        });
    });
}

许可证

本插件基于 Apache License 开源,详见 LICENSE 文件。

参考资源