进度条用于指示上传或下载的进度。

下面的代码以Bucket.PutObjectFromFile方法为例，介绍如何使用进度条。

package main
import (
    "fmt"
    "os"
    "github.com/aliyun/aliyun-oss-go-sdk/oss"
)
// 定义进度条监听器。
type OssProgressListener struct {
}
// 定义进度变更事件处理函数。
func (listener *OssProgressListener) ProgressChanged(event *oss.ProgressEvent) {
    switch event.EventType {
    case oss.TransferStartedEvent:
        fmt.Printf("Transfer Started, ConsumedBytes: %d, TotalBytes %d.\n",
            event.ConsumedBytes, event.TotalBytes)
    case oss.TransferDataEvent:
        fmt.Printf("\rTransfer Data, ConsumedBytes: %d, TotalBytes %d, %d%%.",
            event.ConsumedBytes, event.TotalBytes, event.ConsumedBytes*100/event.TotalBytes)
    case oss.TransferCompletedEvent:
        fmt.Printf("\nTransfer Completed, ConsumedBytes: %d, TotalBytes %d.\n",
            event.ConsumedBytes, event.TotalBytes)
    case oss.TransferFailedEvent:
        fmt.Printf("\nTransfer Failed, ConsumedBytes: %d, TotalBytes %d.\n",
            event.ConsumedBytes, event.TotalBytes)
    default:
    }
}
func main() {
    // 创建OSSClient实例。
    client, err := oss.New("<yourEndpoint>", "<yourAccessKeyId>", "<yourAccessKeySecret>")
    if err != nil {
        fmt.Println("Error:", err)
        os.Exit(-1)
    }
    bucketName := "<yourBucketName>"
    objectName := "<yourObjectName>"
    localFile := "<yourLocalFile>"
    // 获取存储空间。
    bucket, err := client.Bucket(bucketName)
    if err != nil {
        fmt.Println("Error:", err)
        os.Exit(-1)
    }
    // 带进度条的上传。
    err = bucket.PutObjectFromFile(objectName, localFile, oss.Progress(&OssProgressListener{}))
    if err != nil {
        fmt.Println("Error:", err)
        os.Exit(-1)
    }
}