Handling ToUnicode Mapping Errors in PDF Text Editing (fpdf_edit_text.cpp) – Specifically for Missing CharCode of Space Character (Unicode 32) in Fully Embedded Microsoft YaHei Font, Seeking Official Recommended Solutions.
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李寻欢
Jun 16, 2025, 11:15:23 PMJun 16
to pdfium
When handling the ToUnicode writing error in fpdf_edit_text.cpp, I noticed that for the fully embedded Microsoft YaHei font, the space character (Unicode 32) cannot be mapped to a corresponding CharCode. My current workaround is to manually add a dedicated entry for the space character to the ToUnicode stream. Could the official team suggest a more elegant or standard solution? Your assistance would be greatly appreciated!
Lei Zhang
Jun 18, 2025, 2:36:31 PMJun 18
to 李寻欢, pdfium
Hi,
1) There's no fpdf_edit_text.cpp, I believe you meant fpdf_edittext.cpp?
2) fpdf_edittext.cpp is over 1000 lines long. What function are you
referring to?
3) It sounds like you are dealing with a particular PDF that has some
embedded font. Can you share the PDF for reference?
On Mon, Jun 16, 2025 at 8:15 PM 李寻欢 <20021...@gmail.com> wrote:
>
> When handling the ToUnicode writing error in fpdf_edit_text.cpp, I noticed that for the fully embedded Microsoft YaHei font, the space character (Unicode 32) cannot be mapped to a corresponding CharCode. My current workaround is to manually add a dedicated entry for the space character to the ToUnicode stream. Could the official team suggest a more elegant or standard solution? Your assistance would be greatly appreciated!
>
> --
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1) There's no fpdf_edit_text.cpp, I believe you meant fpdf_edittext.cpp?
2) fpdf_edittext.cpp is over 1000 lines long. What function are you
referring to?
3) It sounds like you are dealing with a particular PDF that has some
embedded font. Can you share the PDF for reference?
On Mon, Jun 16, 2025 at 8:15 PM 李寻欢 <20021...@gmail.com> wrote:
>
> When handling the ToUnicode writing error in fpdf_edit_text.cpp, I noticed that for the fully embedded Microsoft YaHei font, the space character (Unicode 32) cannot be mapped to a corresponding CharCode. My current workaround is to manually add a dedicated entry for the space character to the ToUnicode stream. Could the official team suggest a more elegant or standard solution? Your assistance would be greatly appreciated!
>
> You received this message because you are subscribed to the Google Groups "pdfium" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to pdfium+un...@googlegroups.com.
> To view this discussion visit https://groups.google.com/d/msgid/pdfium/3df4baf5-0a5d-4661-837e-fca479a0271cn%40googlegroups.com.
吴吴
Jul 8, 2025, 1:35:43 AMJul 8
to pdfium
I also encountered this problem by using the FPDFText_LoadFont() API to load Microsoft Yahei font. The font_type is FPDF-FONTTRUETYPE and cid is true. Setting the space character is invalid because Chinese characters need to be drawn, so the font_type is FPDF-FONTTRUETYPE
吴吴
Jul 8, 2025, 1:39:54 AMJul 8
to pdfium
For example, I need to use this text "我爱 中国" , This space character is invalid, pTextObj ->GetFont() ->CharCodeFromUnicode (wc) returns a value of 0
在2025年6月19日星期四 UTC+8 02:36:31<Lei Zhang> 写道：
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