告诉abcPdf缩放html以适应单个pdf页面

Question

我正在使用abcPdf将HTML报告转换为pdf文件.pdf必须是单一的横向A4页面.

你知道是否有办法告诉abcPdf扩展HTML页面以适应pdf中的单个页面？我尝试使用Magnify()方法,它会缩放内容但仍将其分解为页面,即使它适合一页.我一直在摸不着头脑,我想知道是否有人这样做过.

这是我目前正在使用的代码:

public byte[] UrlToPdf(string url, PageOrientation po)
{
    using (Doc theDoc = new Doc())
    {
        // When in landscape mode:
        // We use two transforms to apply a generic 90 degree rotation around
        // the center of the document and rotate the drawing rectangle by the same amount.
        if (po == PageOrientation.Landscape)
        {
            // apply a rotation transform
            double w = theDoc.MediaBox.Width;
            double h = theDoc.MediaBox.Height;
            double l = theDoc.MediaBox.Left;
            double b = theDoc.MediaBox.Bottom;
            theDoc.Transform.Rotate(90, l, b);
            theDoc.Transform.Translate(w, 0);

            // rotate our rectangle
            theDoc.Rect.Width = h;
            theDoc.Rect.Height = w;

            // To change the default orientation of the document we need to apply a rotation to the root page object.
            //By doing this we ensure that every page in the document is viewed rotated.
            int theDocID = Convert.ToInt32(theDoc.GetInfo(theDoc.Root, "Pages"));
            theDoc.SetInfo(theDocID, "/Rotate", "90");
        }

        theDoc.HtmlOptions.PageCacheEnabled = false;
        theDoc.HtmlOptions.AddForms = false;
        theDoc.HtmlOptions.AddLinks = false;
        theDoc.HtmlOptions.AddMovies = false;
        theDoc.HtmlOptions.FontEmbed = false;
        theDoc.HtmlOptions.UseResync = false;
        theDoc.HtmlOptions.UseVideo = false;
        theDoc.HtmlOptions.UseScript = false;
        theDoc.HtmlOptions.HideBackground = false;
        theDoc.HtmlOptions.Timeout = 60000;
        theDoc.HtmlOptions.BrowserWidth = 0;
        theDoc.HtmlOptions.ImageQuality = 101;

        // Add url to document.
        int theID = theDoc.AddImageUrl(url, true, 0, true);
        while (true)
        {
            if (!theDoc.Chainable(theID))
                break;
            theDoc.Page = theDoc.AddPage();
            theID = theDoc.AddImageToChain(theID);
        }
        //Flattening the pages (Whatever that means)
        for (int i = 1; i <= theDoc.PageCount; i++)
        {
            theDoc.PageNumber = i;
            theDoc.Flatten();
        }

        return theDoc.GetData();
    }
}

Answer 1

所以这就是我解决这个问题的方法.

首先,我需要将HTML页面的高度传递给pdf生成方法,所以我在页面上添加了这个pdf-ed:

<asp:HiddenField ID="hfHeight" runat="server" />

并在后面的代码中:

protected void Page_Init(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        string scriptKey = "WidhtHeightForPdf";
        if (!Page.ClientScript.IsClientScriptBlockRegistered(scriptKey))
        {
            StringBuilder sb = new StringBuilder();
            sb.AppendLine("<script>")
                .AppendLine("document.getElementById('" + hfHeight.ClientID + "').value = document.body.clientHeight;")
                .AppendLine("</script>");

            Page.ClientScript.RegisterStartupScript(typeof(Page), scriptKey, sb.ToString());
        }
    }
}

现在,当我调用pdf生成方法时,我可以将它传递给HTML的高度.一旦我有了高度,就可以计算pdf"viewport"的宽度,使得高度适合pdf页面:

int intHTMLWidth = height.Value * Convert.ToInt32(theDoc.Rect.Width / theDoc.Rect.Height);

然后指定通过BrowserWidth参数两种HtmlOptions的theDoc:

theDoc.HtmlOptions.BrowserWidth = intHTMLWidth;

或者将网址添加到theDoc:

int theID = theDoc.AddImageUrl(url, true, intHTMLWidth, true);

编辑:这解决了这个问题,所以我打算将它标记为答案.现在接下来要做的是根据HTML的宽度和高度在protrait或横向模式下创建pdf,以便在pdf页面上使用最大空间.