微信小程序wx.saveImageToPhotosAlbum保存图片到相册保存不了？

Question

在做微信小程序的时候需要将图片保存到相册，但是用微信提供的api wx.saveImageToPhotosAlbum 保存更本没有效果，网络图片和本地图片都试过了。下面是我的代码：
代码一：

wx.getImageInfo({
  src: '../images/shareimg.jpg',
  success: function (res) {
    console.log(res.path)
    wx.getSetting({
      success(res) {
        if (!res.authSetting['scope.writePhotosAlbum']) {
          wx.authorize({
            scope: 'scope.writePhotosAlbum',
            success() {
              wx.saveImageToPhotosAlbum({
                filePath: res.path,
                success(result) {
                  console.log(result)
                }
              })
            }
          })
        }
      }
    })
  }
})

代码二：

wx.downloadFile({
  url: 'https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/logo_white_fe6da1ec.png',
  success: function (res) {

    wx.saveImageToPhotosAlbum({
      filePath: res.tempFilePath,
      success(result) {
        console.log(result)
      }
    })

    wx.saveFile({
      tempFilePath: res.tempFilePath,
      success: function (res) {
        console.log(res.savedFilePath) 
      }
    })
    
  }
})

Answer 1

试了下, 是可以的, 保存之前先download一下, 把返回的tempFilePath临时文件路径给wx.saveImageToPhotosAlbum的filePath参数

<!--wxml-->
<image class="img" src="http://img02.tooopen.com/images/20150928/tooopen_sy_143912755726.jpg"></image>
<button bindtap='saveImg'>Save</button>

saveImg: function(){
    wx.downloadFile({
      url:'http://img02.tooopen.com/images/20150928/tooopen_sy_143912755726.jpg',
      success:function(res){
        let path = res.tempFilePath
        wx.saveImageToPhotosAlbum({
          filePath: path,
          success(res) {
            console.log(res)
          },
          fail(res) {
            console.log(res)
          },
          complete(res) {
            console.log(res)
          }
        })
      },fail:function(res){
        console.log(res)
      }
    })
    
  }

Answer 2

感觉没必要download，试了一下，这样也是可以的

 wx.getImageInfo({
            src: 'https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/logo_white_fe6da1ec.png',
            success: function (ret) {
                var path = ret.path;
                wx.saveImageToPhotosAlbum({
                    filePath: path,
                    success(result) {
                        console.log(result)
                    }
                })
            }
        })

Answer 3

我刚刚试了一下，调用长按保存图片api之前要先授权,就可以了

wx.getSetting({
            success(res) {
                if (!res.authSetting['scope.writePhotosAlbum']) {
                    wx.authorize({
                        scope: 'scope.writePhotosAlbum',
                        success() {
                            console.log('授权成功')
                        }
                    })
                }
            }
        })

Answer 4

有可能是图片太大了?

Answer 5

你好，请问用小程序的相机拍照后怎么储存在本地呢？

Answer 6

getImageInfo res getSetting 的res 混了，命名成不同的名字就可以了