如何将jpeg图像转换为字节格式

Question

我目前正在使用 Windows phone 应用程序单击图片，我想使用 HTTP post 请求将该图片上传到 Web 服务。我不想使用 windows phone silverlight。

如何将该图像发送到网络服务 URL？

Answer 1

在 http 上发布图像就像发布任何其他文件类型一样。使用以下代码片段

public string PostFileUsingApi()
{
    string result = "";
    string param1 = "value1";

    using (var handler = new HttpClientHandler()) {
        using (var client = new HttpClient(handler) { BaseAddress = new Uri("http://localhost:8008") }) {
            client.Timeout = new TimeSpan(0, 20, 0);

            StorageFile storageFile = await Windows.Storage.StorageFile.GetFileFromApplicationUriAsync(uri);
            Stream stream = await storageFile.OpenStreamForReadAsync();

            var requestContent = new MultipartFormDataContent();
            StreamContent fileContent = new StreamContent(stream);
            fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data") {
                Name = "imagekey", //content key goes here
                FileName = "myimage"
            };

            fileContent.Headers.ContentType = MediaTypeHeaderValue.Parse("image/bmp");

            requestContent.Add(fileContent);

            client.DefaultRequestHeaders.Add("ClientSecretKey", "ClientSecretValue");

            HttpResponseMessage response = await client.PostAsync("api/controller/UploadData?param1=" + HttpUtility.UrlEncode(param1), requestContent).Result;

            if (response.StatusCode == System.Net.HttpStatusCode.OK) {
                result = await response.Content.ReadAsStringAsync().Result
            } else {
                result = "";
            }
        }
    }

    return result;
}

安装这个包来解决依赖关系 https://www.nuget.org/packages/microsoft.aspnet.webapi.client/

如何将jpeg图像转换为字节格式

how to convert jpeg image to byte format

c#

xaml

windows-phone-8