1.从相册里面选取图片
1 ///2 /// 1.1 从相册里面选取图片 3 /// 4 /// 5 /// 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 ///2 /// 1.2 相机 3 /// 4 /// 5 /// 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 ///2 /// 1.4 裁剪图片 3 /// 4 /// 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:
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 ///3 /// 向服务器发送post请求(修改头像) 4 /// 5 /// 路径 6 ///7 public async static Task SendPostRequest(string url) 8 { 9 try10 {11 Dictionary dic = new Dictionary ();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 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!!