javascript - 将整数数组解码为 PNG(JavaScript、node.js)

Question

我正在尝试将整数数组转换为 PNG 文件。

function saveImg(data, dir, name, waveBand) {
    if (!fs.existsSync(dir)){
        logger.info(dir + ' does not exist... creating!');
        fs.mkdirSync(dir);
    }

    logger.info('received data with length ' + data.length);
    try {
        const encoder = new util.TextDecoder("utf-8");
        const decodedData = encoder.decode(new Uint8Array(data));
        logger.info('decoded string: ' + decodedData);
        const imgLocation = path.join(getStoragePublicFolder(), dir, name + '.png');
        logger.info('Writing image to location: ' + imgLocation);

        fs.writeFile(path.resolve(imgLocation), decodedData,
            function(err) {
                if(err) 
                    logger.info(err);
            }
        );

        logger.info('Success! Image saved to ' + imgLocation);
        return imgLocation;
    } 
    catch (err)
    { 
        logger.error('Failed to save image - ' + err); 
    }
    return defaultPath(waveBand);
}

我的数据如下所示:https://jsfiddle.net/ebaxg3q4/

不幸的是，数据解码出现问题，因此 image is corrupted .

这是哪种编码？我犯了什么错误？

提前致谢!

Answer 1

您可以使用 Buffer.from(Array) 从站点位图数据创建缓冲区。

然后我们可以使用 fs.writeFile 将缓冲区写入 .png 文件。

此代码适用于我(使用您的示例数据):

function saveImg(data, dir, name, waveBand) {
    if (!fs.existsSync(dir)){
        logger.info(dir + ' does not exist... creating!');
        fs.mkdirSync(dir);
    }

    logger.info('received data with length ' + data.length);
    try {
        const decodedData = Buffer.from(data);
        const imgLocation = path.join(getStoragePublicFolder(), dir, name + '.png');
        logger.info('Writing image to location: ' + imgLocation);
        fs.writeFile(path.resolve(imgLocation), decodedData,
            function(err) {if(err) logger.info(err);});
        logger.info('Success! Image saved to ' + imgLocation);
        return imgLocation;
    } catch (err){ logger.error('Failed to save image - ' + err); }
    return defaultPath(waveBand);
}

// Use the first station in the station list.
saveImg(dummyStation.stationList[0].stationIconPicture.data.data, "./test", "station");