tencent cloud

// Bucket name in the format of `BucketName-APPID` (`APPID` is required), which can be viewed in the COS console at https://console.tencentcloud.com/cos5/bucket.
String bucket = "examplebucket-1250000000";
// The location of the object in the bucket, i.e., the object key
String cosPath = "exampleobject";
HashMap<String, String> parameters = HashMap();
parameters["test1k"] = "test1v";
parameters["test2k"] = "test2v";
try {
  // Get a pre-signed URL for downloading objects
  String objectUrl = await Cos().getDefaultService().getPresignedUrl(
    bucket, 
    cosPath, 
    parameters: parameters
  );
} catch (e) {
  // An exception will be reported in case of failure. Process the business logic accordingly.
  print(e);
}