FPDFText_FindStart findwhat in c++ is FPDF_WIDESTRING ，but in FPDFTextFindStart is ushort findwhat，i dont know How to convert?

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I found parameter “findwhat” in other projects define byte[] not “ref ushort findwhat”，Suggestions for other ways to do this?ths

// Function: FPDFText_FindStart // Start a search. // Parameters: // text_page - Handle to a text page information structure. // Returned by FPDFText_LoadPage function. // findwhat - A unicode match pattern. // flags - Option flags. // start_index - Start from this character. -1 for end of the page. // Return Value: // A handle for the search context. FPDFText_FindClose must be called // to release this handle. // FPDF_EXPORT FPDF_SCHHANDLE FPDF_CALLCONV FPDFText_FindStart(FPDF_TEXTPAGE text_page, FPDF_WIDESTRING findwhat, unsigned long flags, int start_index);

public static global::PDFiumCore.FpdfSchhandleT FPDFTextFindStart(global::PDFiumCore.FpdfTextpageT text_page, ref ushort findwhat, uint flags, int start_index)