pdf 上的所有文本都呈现为 squares/blocks □

Question

为什么我的输出只有正方形？

我正在尝试将 html 转换为 pdf，但我得到了一个奇怪的输出，其中所有字符都是方块，如下所示：

我的函数如下：

   public static class ConstructPDFHttpTriggered
    {
        [FunctionName("ConstructPDFHttpTriggered")]
        public static async Task<HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)]HttpRequestMessage req, TraceWriter log)
        {
            log.Info("Processing PDF Request");

            string dataDetails = string.Empty;
            bool isError = false;

            try
            {
                string name = req.GetQueryNameValuePairs()
                            .FirstOrDefault(q => string.Compare(q.Key, "name", true) == 0)
                            .Value;

                if (name == null)
                {
                    // Get request body
                    dynamic data = await req.Content.ReadAsAsync<object>();
                    name = data?.name;
                }

                //Constrcut PDF object
                var pdf = Pdf

                    .From(name)
                    .WithObjectSetting("web.printMediaType", "true")
                    .Content();

                log.Info($"PDF Generated. Length={pdf.Length}");

                //Convert PDF stream to base64 string
                dataDetails = Convert.ToBase64String(pdf);
            }
            catch (Exception ex)
            {
                isError = true;
                dataDetails = ex.Message;
            }

            return isError
                ? req.CreateResponse(HttpStatusCode.BadRequest, dataDetails)
                : req.CreateResponse(HttpStatusCode.OK, dataDetails);
        }
    }

为什么我的输出只有正方形？我做错了什么？

Answer 1

原来我们无法在 consumption plan. The OpenHtmlToPdf library uses fonts, which requires an OS to be present within that environment. After switching the function to an App Sevice plan 上运行这个问题，这个问题已经简单地解决了。

pdf 上的所有文本都呈现为 squares/blocks □

all the text on the pdf is rendering as squares/blocks □

.net

c#

azure-functions

openhtmltopdf