我们使用WkHtmlToPdf转换从HTML到PDF。 现在我已经让所有的表单字段要求编辑为好。 由于有一个bug在WkHtmlToPdf在转换HTML到PDF它使所有表单字段的属性作为可见不能打印。
为了解决这个问题，我们正在使用iTextSharp的阅读已经由WkHtmlToPdf并设置该属性为可见的每个表单字段生成现有的PDF。
这就是我正在做的是
var pdfReader = new PdfReader(inputFilename);
using (var outputStream = new FileStream(outputFilename, FileMode.OpenOrCreate))
{
var stamper = new PdfStamper(pdfReader, outputStream);
// Regenarating all the fileds using itextSharp.
// Since wkHtmltoPdf has differnt default settings for pdf form fields (Visible and not Printable)
var formFields = stamper.AcroFields;
var filedNames = formFields.Fields.Keys;
foreach (var keyName in filedNames)
{
formFields.SetFieldProperty(keyName, "setflags", PdfAnnotation.FLAGS_PRINT, null);
formFields.SetFieldProperty(keyName, "setflags", PdfFormField.FF_EDIT, null);
formFields.SetFieldProperty(keyName, "textsize", 8.0f, null);
formFields.RegenerateField(keyName);
}
}
这解决了我的问题的所有领域，但复选框。 我有几个HTML复选框被转换使用WkHtmlToPdf为PDF。 我意识到，当过我尝试RegenerateField（）（最后一行foreach循环）复选框失去其所有特性（无论是我选中或取消选中），它只是显示空复选框，它不能编辑。
为了解决这个问题，我想出了以下
if (formFields.GetFieldType(keyName).Equals(AcroFields.FIELD_TYPE_CHECKBOX))
{
// Regenerate checkbox formfield causing it to reset all its properties
// including checkd/uncheked property
formFields.SetFieldProperty(keyName, "setflags", PdfAnnotation.FLAGS_PRINT, null);
// Ignore the commented code as it is not working Not sure why??? and how
//var item = formFields.GetFieldItem(keyName);
//var appearance = item.GetValue(0).Get(PdfName.AS);
//if (appearance != null)
/{
// if (appearance.tostring().tolower().equals("/yes"))
// {
// formfields.regeneratefield(keyname);
// Not even one working when I try to set the check box status like below
// success = formfields.setfield(keyname, "yes");
// success = formfields.setfield(keyname, "/yes");
// success = formfields.setfield(keyname, "/yes");
// success = formfields.setfield(keyname, "on");
// success = formfields.setfield(keyname, "1");
// }
}
与代码（不包括注释）代码复选框成功保持其地位，并在生成的PDF显示。 但它不是打印。 我检查复选框的性质，就像在PDF中的任何其他字段可见。 除了复选框所有字段（文本框）打印其值。
>打开PDF文件 - - 我通过检查属性>表格 - >添加/编辑域
我在做什么错在这里？ 相反，在复选框设置属性的我试图构建使用iTextSharp的一个全新的复选框，但我不能使用ItexSharp手动例子。 这样做的人做这个东西之前？
即使我产生使用iTextSharp的一个新的复选框，我怎么能顶替正是现有的复选框？
非常感谢我的故事..
好吧，我用iTextSharp的替代wkHtmltoPdf复选框解决了这个问题。 我回答得很详细，可能节省您的时间
/// <summary>
/// By default, wkHtmlToPdf leaves pdf form fields as being "Visible but not printable". Using iTextSharp we will change them to being "Visible".
/// </summary>
private string MakePdfFormFieldsEditable(string inputFilename)
{
var outputFilename = CreateTempPdfFilename();
var pdfReader = new PdfReader(inputFilename);
var checkedCheckBoxNames = new List<string>();
using (var outputStream = new FileStream(outputFilename, FileMode.OpenOrCreate))
{
var stamper = new PdfStamper(pdfReader, outputStream);
// Regenarating all the fileds using itextSharp.
// Since wkHtmltoPdf has differnt default settings for pdf form fields (Visible and not Printable)
var formFields = stamper.AcroFields;
var filedNames = formFields.Fields.Keys;
var removableFiledNames = new List<string>();
foreach (var keyName in filedNames)
{
if (formFields.GetFieldType(keyName).Equals(AcroFields.FIELD_TYPE_CHECKBOX))
{
// Since check boxes generated by WKHtmltoPdf is crapy and click behaviour is annoying
// we are replacing it with new checkbox
var item = formFields.GetFieldItem(keyName);
// Return "/yes" if it's checked
var appearance = item.GetValue(0).Get(PdfName.AS);
// Holds current page number information and Location on the page (Rectangle Dimentions)
var position = formFields.GetFieldPositions(keyName);
var newCheckBoxFieldname = CreateNewCheckBox(position, stamper, keyName);
// set newly created check box value
if (appearance != null && appearance.ToString().ToLower().Equals("/yes"))
{
checkedCheckBoxNames.Add(newCheckBoxFieldname);
}
// List of Check Box field names to be removed
removableFiledNames.Add(keyName);
}
else
{
formFields.SetFieldProperty(keyName, "setflags", PdfAnnotation.FLAGS_PRINT, null);
formFields.SetFieldProperty(keyName, "setflags", PdfFormField.FF_EDIT, null);
formFields.SetFieldProperty(keyName, "textsize", 8.0f, null);
formFields.RegenerateField(keyName);
}
}
// Removing check boxes generaed with WkHtmlToPdf
foreach (var oldCheckBox in removableFiledNames)
{
formFields.RemoveField(oldCheckBox);
}
stamper.Close();
}
return checkedCheckBoxNames.Any() ? UpdateCheckBoxes(outputFilename, checkedCheckBoxNames) : outputFilename;
}
/// <summary>
/// Updating Check Boxe's status checked or not in input file
/// </summary>
private string UpdateCheckBoxes(string inputFilename, ICollection<string> checkedCheckBoxNames)
{
var outputFilename = CreateTempPdfFilename();
var pdfReader = new PdfReader(inputFilename);
using (var outputStream = new FileStream(outputFilename, FileMode.OpenOrCreate))
{
var stamper = new PdfStamper(pdfReader, outputStream);
var newformFields = stamper.AcroFields;
var newfiledNames = newformFields.Fields.Keys;
foreach (var keyName in newfiledNames)
{
if (!newformFields.GetFieldType(keyName).Equals(AcroFields.FIELD_TYPE_CHECKBOX)) continue;
if (!checkedCheckBoxNames.Contains(keyName)) continue;
newformFields.SetField(keyName, "On");
}
stamper.Close();
}
return outputFilename;
}
/// <summary>
/// Constructing new check box
/// </summary>
/// <param name="fieldPosition"></param>
/// <param name="stamper"></param>
/// <param name="keyName"></param>
/// <returns>new field name</returns>
private string CreateNewCheckBox(IList<AcroFields.FieldPosition> fieldPosition, PdfStamper stamper, string keyName)
{
var pageNumber = fieldPosition.First().page;
var locationRectangle = fieldPosition.First().position;
PdfContentByte canvas = stamper.GetOverContent(1);
// Create array with two appearances
var onOff = new PdfAppearance[2];
onOff[0] = canvas.CreateAppearance(15, 15);
onOff[0].Rectangle(1, 1, 13, 13);
onOff[0].Stroke();
onOff[1] = canvas.CreateAppearance(15, 15);
onOff[1].SetRGBColorFill(255, 128, 128);
onOff[1].Rectangle(1, 1, 13, 13);
onOff[1].FillStroke();
onOff[1].MoveTo(1, 1);
onOff[1].LineTo(14, 14);
onOff[1].MoveTo(1, 14);
onOff[1].LineTo(14, 1);
onOff[1].Stroke();
var newFieldName = keyName + "_G";
// Creates new check boxes
var checkbox = new RadioCheckField(stamper.Writer, locationRectangle, newFieldName, "On");
var field = checkbox.CheckField;
// Add check box field to writer
stamper.AddAnnotation(field, pageNumber);
return newFieldName;
}
这是使用CSS伪元素我的解决方案：
<style>
label.checkbox:before {
content: "☐ ";
}
label.checkbox.checked:before {
content: "☑ ";
}
</style>
<label class="checkbox checked">Yes</label>
<label class="checkbox">No</label>
