Question

使用Microsoft Graph v1.0 api和C＃，我能够更新（修补）现有的OneNote页面，但是在将图像数据写入multipart / form-data部分后，生成的图像高度和宽度是正确的，但是，图像不会在页面上呈现 - 除了空图像占位符。

所以问题是，OneNote对PATCH命令所期望的正确图像格式是什么？文档声明它必须是二进制图像数据＆＃39;。不应该File.ReadAllBytes足够吗？

以下是目前尝试的格式：

string file = @"c:\images\file1.jpg";

var rawData = System.IO.File.ReadAllText(file); //attempt1
byte[] bytes = System.IO.File.ReadAllBytes(file);  //attempt2
var byteArray = BitConverter.ToString(bytes);   //attempt3
var byteString = Encoding.ASCII.GetString(bytes);  //attempt4
string base64String = Convert.ToBase64String(bytes, 0, bytes.Length);  //attempt5
string imageDataURL = string.Format("data:image/jpeg;base64,{0}", base64String);  //attempt6

...

/* Construct message content */
StringBuilder sb = new StringBuilder();
sb.Append("--MyPartBoundary198374" + "\r\n");
sb.Append(@"Content-Disposition: form-data; name=""Commands"""  + "\r\n");
sb.Append("Content-Type: application/json" + "\r\n" + "\r\n");

sb.Append(
@"[{
    'target':'body',
    'action':'append',
    'position':'before',
    'content':'<img src=""name:image1"" width=""400"" height=""500""/>'
}]" 

+ "\r\n" + "\r\n");

sb.Append("--MyPartBoundary198374" + "\r\n");
sb.Append(@"Content-Disposition: form-data; name=""image1""" + "\r\n");
sb.Append("Content-Type: image/jpeg" +  "\r\n\r\n" );
sb.Append([see formats above] + "\r\n");
sb.Append("--MyPartBoundary198374--" );

string content = sb.ToString();
string contentType = "multipart/form-data; boundary=MyPartBoundary198374";
var result = await OneNoteService.UpdatePageAsync(client, page, contentType, content);

...

internal static async Task <HttpResponseMessage> UpdatePageAsync(GraphServiceClient client, OnenotePage page, string contentType, string content)
{
    HttpResponseMessage response = null;

    try
    {
        string requestUri = client.Users[ME].Onenote.Pages[page.Id].Content.Request().RequestUrl;

        List<OnenotePatchContentCommand> patchCommands = new List<OnenotePatchContentCommand>();

        HttpRequestMessage request = new HttpRequestMessage()
        {
            Method = new HttpMethod("PATCH"),
            RequestUri = new Uri(requestUri),
            Content = new StringContent(content, Encoding.UTF8, "application/json"),
        };

        request.Content.Headers.Remove("Content-Type");
        request.Content.Headers.TryAddWithoutValidation("Content-Type", contentType);

        // Adds the user's access token from the GraphServiceClient to the request.
        await client.AuthenticationProvider.AuthenticateRequestAsync(request);

        response = await client.HttpProvider.SendAsync(request);

        if (!response.IsSuccessStatusCode)
        {
            throw new Microsoft.Graph.ServiceException(
                new Error
                {
                    Code = response.StatusCode.ToString(),
                    Message = await response.Content.ReadAsStringAsync()
                });
        }
    }
    catch (Exception ex)
    {
        //TODO: Error handling
        Console.WriteLine(ex.ToString());
    }
    return response;
}

此帖中列出的建议未解决此问题： Inserting image into existing OneNote page via REST api not working

试图解决这个问题超过一天。有人可以提供PATCH命令所需的正确图像数据格式。

谢谢，罗兰

Answer 1

将之前的评论移至答案以防其他人遇到此问题。

不是发送多个部分，而是组合尝试5＆amp; 6并将结果直接包含在src属性中：

string base64String = Convert.ToBase64String(bytes, 0, bytes.Length);  //attempt5
string imageDataURL = string.Format("data:image/jpeg;base64,{0}", base64String);  //attempt6

/* Construct message content */
StringBuilder sb = new StringBuilder();
sb.Append("--MyPartBoundary198374" + "\r\n");
sb.Append(@"Content-Disposition: form-data; name=""Commands"""  + "\r\n");
sb.Append("Content-Type: application/json" + "\r\n" + "\r\n");

sb.Append(
@"[{
    'target':'body',
    'action':'append',
    'position':'before',
    'content':'<img src=" + imageDataURL  + " width=""400"" height=""500""/>'
}]" 

+ "\r\n" + "\r\n");

这将直接在您插入的HTML中包含图像。

通过附加二进制图像内容来修补现有的OneNote页面

1 个答案: