UniAPP APP filePath转base64/处理不支持当前路径问题

主要是为了处理问题 targetSdkVersion设置>=29后在Android10+系统设备不支持当前路径。请更改为应用运行路径！具体请看:https://ask.dcloud.net.cn/article/36199

async function path2Base64(path: string) {
  // 通过 UniAPP提供的方法把原始图片路径转为临时图片路径
  const localPath = await new Promise((resolve, reject) => {
    uni.compressImage({
      src: path,
      quality: 100,
      success: res => {
        resolve(getLocalFilePath(res.tempFilePath));
      },
      fail: e => {
        reject('compressImage:e', e);
      },
    });
  });
  const base64: string = await new Promise((resolve, reject) => {
    plus.io.resolveLocalFileSystemURL(
      getLocalFilePath(path),
      function (entry) {
        (entry as any).file(
          function (file) {
            var fileReader = new plus.io.FileReader();
            fileReader.onload = function (data: any) {
              resolve(data.target.result);
            };
            fileReader.onerror = function (e) {
              console.error('FileReader:e', e);
              reject(e);
            };
            fileReader.readAsDataURL(file);
          },
          function (e) {
            console.error('entry:e', e);
            reject(e);
          }
        );
      },
      function (e) {
        console.error('resolveLocalFileSystemURL:e', e);
        reject(e);
      }
    );
  });
  return base64;
}
function getLocalFilePath(path: string) {
  if (
    path.indexOf('_www') === 0 ||
    path.indexOf('_doc') === 0 ||
    path.indexOf('_documents') === 0 ||
    path.indexOf('_downloads') === 0
  ) {
    return path;
  }
  if (path.indexOf('file://') === 0) {
    return path;
  }
  if (path.indexOf('/storage/emulated/0/') === 0) {
    return path;
  }
  if (path.indexOf('/') === 0) {
    var localFilePath = plus.io.convertAbsoluteFileSystem(path);
    if (localFilePath !== path) {
      return localFilePath;
    } else {
      path = path.substr(1);
    }
  }
  return '_www/' + path;
}

示例

uni.chooseImage({
  success: async res => {
    try {
      const { tempFilePaths } = res;
      const filePaths = typeof tempFilePaths !== 'string' ? tempFilePaths : [tempFilePaths];
      const base64Arr: string[] = [];
      for (const path of filePaths) {
        const base64 = await path2Base64(path);
        base64Arr.push(base64);
      }
    } catch (e) {
      console.log('chooseImage:e', e);
    }
  },
});