| lpcszBuffer | Pointer to a text buffer where the character is located. |
| nOffset | Specifies the offset of the character from the beginning of the buffer |
| nCount | Specifies the number of characters in the buffer. |
| chSymbol | Specifies the character to be checked. |
| symDef | [out] When the function returns, contains a symbol definition for the character. |
| nSymExtraLen | [out] When the function returns, contains the length of character sequence if LookUpSymbol determines that the current character belongs to a sequence to be replaced. |
| bForward | Specifies the search direction for sequences. TRUE - forward, FALSE - backward. |