UWP 使用Windows.Web.Http命名空间下的HttpClient使用post方法,上传图片服务器

2017-08-02 22:42:51来源:cnblogs.com作者:摇曳中的蒲公英人点击

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1.从相册里面选取图片

 1         /// <summary> 2         /// 1.1 从相册里面选取图片 3         /// </summary> 4         /// <param name="sender"></param> 5         /// <param name="e"></param> 6         private async void btnPhoto_Click(object sender, RoutedEventArgs e) 7         { 8             //创建和自定义 FileOpenPicker (从本地获取一张图片)  9             FileOpenPicker picker = new FileOpenPicker();10             picker.ViewMode = PickerViewMode.Thumbnail; //可通过使用图片缩略图创建丰富的视觉显示,以显示文件选取器中的文件  11             picker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;//对话框打开时的默认路径(图片库)12             //设置可选择的文件类型13             picker.FileTypeFilter.Add(".jpg");14             picker.FileTypeFilter.Add(".jpeg");15             picker.FileTypeFilter.Add(".png");16             picker.FileTypeFilter.Add(".gif");17             //选取单个文件  18             StorageFile file = await picker.PickSingleFileAsync();19             if (file != null)20             {21                 CutPicture(file);//裁剪图片22             }23         }

2.从相机里面选取图片

 1         /// <summary> 2         /// 1.2 相机 3         /// </summary> 4         /// <param name="sender"></param> 5         /// <param name="e"></param> 6         private async void btnCamera_Click(object sender, RoutedEventArgs e) 7         { 8             CameraCaptureUI captureUI = new CameraCaptureUI(); 9             captureUI.PhotoSettings.Format = CameraCaptureUIPhotoFormat.Jpeg;//注意:这里只设置了返回图片格式:Jpeg如果是:Png(手机可以显示,在核心后台图片不显示)和JpegXR(都不显示)会报错;;根据实际情况来10             captureUI.PhotoSettings.AllowCropping = false;11             StorageFile photo = await captureUI.CaptureFileAsync(CameraCaptureUIMode.Photo);12             if (photo != null)13             {14                 CutPicture(photo);//裁剪图片15             }16         }

3.裁剪图片调用的公共方法CutPicture

 1         /// <summary> 2         /// 1.4 裁剪图片 3         /// </summary> 4         /// <param name="file"></param> 5         public async void CutPicture(StorageFile file) 6         { 7             #region 裁剪图片 8             var inputFile = SharedStorageAccessManager.AddFile(file);//  获取一个文件共享Token,使应用程序能够与另一个应用程序共享指定的文件。 9             var destination = await ApplicationData.Current.LocalFolder.CreateFileAsync("Cropped.jpg", CreationCollisionOption.ReplaceExisting);//在应用文件夹中建立文件用来存储裁剪后的图像 10             var destinationFile = SharedStorageAccessManager.AddFile(destination);11             var options = new LauncherOptions();12             options.TargetApplicationPackageFamilyName = "Microsoft.Windows.Photos_8wekyb3d8bbwe";//应用于启动文件或URI的目标包的包名称13             //待会要传入的参数 14             var parameters = new ValueSet();15             parameters.Add("InputToken", inputFile);                //输入文件 16             parameters.Add("DestinationToken", destinationFile);    //输出文件 17             parameters.Add("ShowCamera", false);                    //它允许我们显示一个按钮,以允许用户采取当场图象(但是好像并没有什么用) 18             parameters.Add("EllipticalCrop", true);                 //截图区域显示为圆(最后截出来还是方形) 19             parameters.Add("CropWidthPixals", 300);20             parameters.Add("CropHeightPixals", 300);21             //调用系统自带截图并返回结果 22             var result = await Launcher.LaunchUriForResultsAsync(new Uri("microsoft.windows.photos.crop:"), options, parameters);23             if (result.Status == LaunchUriStatus.Success && result.Result != null)24             {25                 //对裁剪后图像的下一步处理 26                 try27                 {28                     // 载入已保存的裁剪后图片 29                     var stream = await destination.OpenReadAsync();30                     var bitmap = new BitmapImage();31                     await bitmap.SetSourceAsync(stream);32                       // 显示裁剪过后的图片 33                     imglogo.ImageSource = bitmap;34                     //此方法是请求后台修改图片35                     SetHeadPicture(destination);36                     OutBorder.Visibility = Visibility.Collapsed;37                 }38                 catch (Exception ex)39                 {40                     System.Diagnostics.Debug.WriteLine(ex.Message + ex.StackTrace);41                 }42             }43             #endregion44         }

 4.使用Windows.Web.Http命名空间下的HttpClient使用post方法,上传图片服务器

参考:https://social.msdn.microsoft.com/Forums/zh-CN/ec0ffd44-f7a6-4a53-8f8e-d15e13cfa5fb/windowswebhttphttpclientpost?forum=winstoreappzhcn

我的做法是将需要上传的参数放在HttpMultipartFormDataContent中,然后再使用HttpClient的PostAsync进行提交

请求参数:

 1        2        /// <summary> 3         /// 向服务器发送post请求(修改头像) 4         /// </summary> 5         /// <param name="url">路径</param> 6         /// <returns></returns> 7         public async static Task<string> SendPostRequest(string url) 8         { 9             try10             {11                 Dictionary<string, object> dic = new Dictionary<string, object>();12                 dic.Add("GWnumber", setHeadPicture.GWnumber);13                 dic.Add("token", setHeadPicture.Token);14                 dic.Add("file", setHeadPicture.File);//file值是StorageFile类型15                 dic.Add("systemType", setHeadPicture.SystemType);16 17                 HttpMultipartFormDataContent form = new HttpMultipartFormDataContent();18                 foreach (KeyValuePair<string, object> item in dic)19                 {20                     if (item.Key == "file")21                     {22                         StorageFile file = item.Value as StorageFile;23                         HttpStreamContent streamContent = new HttpStreamContent(await file.OpenReadAsync());24                         form.Add(streamContent, item.Key, "file.jpg");//注意:这里的值是必须的,图片所以使用的是HttpStreamContent25                     }26                     else27                     {28                         form.Add(new HttpStringContent(item.Value + ""), item.Key);29                     }30                 }31                 HttpClient httpClient = new HttpClient();32                 HttpResponseMessage response = await httpClient.PostAsync(new Uri(url), form).AsTask();33                 var contentType = response.Content.Headers.ContentType;34                 if (string.IsNullOrEmpty(contentType.CharSet))35                 {36                     contentType.CharSet = "utf-8";37                 }38                 return await response.Content.ReadAsStringAsync();39 40             }41             catch (Exception ex)42             {43                 throw ;44             }45         }

uwp小白,请多指教!!

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