如何从 acroform 获取字体颜色？

Question

I using itext7 and I need to get font color from acroform in the pdfformfield.
I didn't find this property in PdfFont .
How can I do it?

Answer 1

The text color from the form field default appearance can be retrieved using

Color textColor = field.getColor();

for a PdfFormField field .

Please beware, though:

• iText 7 only extracts text colors set using one of the operators g , rg , and k which are the convenience operators for setting DeviceGray , DeviceRGB , and DeviceCMYK nonstroking colors respectively. If the color is selected using a different operator or there is no color setting operator at all, null will be returned.

  I've not yet observed a PDF with form field default appearances using other color setting operators. In my experience, therefore, that implementation is sufficient.

• If the field is a rich text field, the default style string may overrule anything in the default appearances, so the color retrieved using getColor() may be incorrect.

  In this situation, though, a user filling in the field is free to use different colors. Thus, in this case an attempt to retrieve "the text color of the field" is questionable anyways.

• A PDF processor or JavaScript code in PDFs can ignore or override the default appearance color. Thus, you never can be sure that the color returned here actually is the color a user will eventually perceive the text color as.