pub type FPDF_STRING = *const c_char;
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For Windows programmers: In most cases it’s OK to treat FPDF_WIDESTRING as a Windows unicode string, however, special care needs to be taken if you expect to process Unicode larger than 0xffff.

For Linux/Unix programmers: most compiler/library environments use 4 bytes for a Unicode character, and you have to convert between FPDF_WIDESTRING and system wide string by yourself.