将页眉和页脚图像添加到PDF：页眉图像不显示，页脚被放大

Question

我正在尝试使用libary ITextSharp创建一个简单的.pdf。我正在制作.pdf，页眉&页脚中有图像，页眉页边距为300px &页脚页边距为664px。

我的问题：由于某种原因，我的代码没有插入页眉图像，页脚图像由于某种原因被放大/放大。

你能告诉我我的代码有什么问题吗？头图像应该延伸&一张A4纸的整个宽度上在高度300像素。页脚图像应该扩展页面的整个宽度，高度为664px。这两个图像都不需要调整大小，它们已经是整个页面宽度的正确高度。

public class itsEventsHandler : PdfPageEventHelper 
{ 
    PdfTemplate total; 
    BaseFont helv; 

    // I am following a tutorial & they said that if I want to create headers/footers when each page is created 
    // that I should override the OnEndPage() not the OnStartPage() is that correct? 
    public override void OnEndPage(PdfWriter writer, Document document) 
    { 
     // Post: When each new page is created, add a header & footer image to the page. And set the top margin to 370px 
     //  and the bottom margin to 664px. 
     // Result: The function executes but the pdf's header image isn't visible & the footer looks resized(scaled up in size). 

     //Footer Image 
     iTextSharp.text.Image imgfoot = iTextSharp.text.Image.GetInstance(resolvePath("~/images/pdf/bottomBorder.jpg")); 
     //Header Image 
     iTextSharp.text.Image imghead = iTextSharp.text.Image.GetInstance(resolvePath("~/images/pdf/topBorder.jpg")); 

     imgfoot.SetAbsolutePosition(0, 0); 
     imghead.SetAbsolutePosition(0, 0); 

     PdfContentByte cbhead = writer.DirectContent; 
     PdfTemplate tp = cbhead.CreateTemplate(2480, 370); // units are in pixels but I'm not sure if thats the correct units 
     tp.AddImage(imghead); 

     PdfContentByte cbfoot = writer.DirectContent; 
     PdfTemplate tpl = cbfoot.CreateTemplate(2480, 664); 
     tpl.AddImage(imgfoot); 

     cbhead.AddTemplate(tp, 0, 0); 
     cbfoot.AddTemplate(tpl, 0, 0); 

     helv = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.WINANSI, BaseFont.NOT_EMBEDDED); 

     /*PdfContentByte cb = writer.DirectContent; 
     cbfoot.SaveState(); 
     document.SetMargins(35, 35, 100, 82); 
     cb.RestoreState();*/ 

     //document.NewPage(); 
     base.OnStartPage(writer, document); 
    } 

    public override void OnOpenDocument(PdfWriter writer, Document document) 
    { 
     total = writer.DirectContent.CreateTemplate(100, 100); 
     total.BoundingBox = new iTextSharp.text.Rectangle(-20, -20, 100, 100); 
     helv = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.WINANSI, BaseFont.NOT_EMBEDDED); 
    } 
} 

// My code to create the pdf 
// Create a Document object 
var document = new Document(PageSize.A4, 50, 50, 370, 664); 
var output = new MemoryStream(); 
var writer = PdfWriter.GetInstance(document, output); 
writer.PageEvent = new itsEventsHandler(); 
// Open the Document for writing 
document.Open(); 
// add some paragrahs 
document.Close(); 

Answer 1

当您添加模板时，请检查其位置。例如：

cbhead.AddTemplate(tp, 0, 715); 
cbfoot.AddTemplate(tpl, 0, 0); 

希望这有助于！